Merge tag 'hyperv-next-signed-20260218' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux

Pull Hyper-V updates from Wei Liu:

- Debugfs support for MSHV statistics (Nuno Das Neves)

- Support for the integrated scheduler (Stanislav Kinsburskii)

- Various fixes for MSHV memory management and hypervisor status
handling (Stanislav Kinsburskii)

- Expose more capabilities and flags for MSHV partition management
(Anatol Belski, Muminul Islam, Magnus Kulke)

- Miscellaneous fixes to improve code quality and stability (Carlos
López, Ethan Nelson-Moore, Li RongQing, Michael Kelley, Mukesh
Rathor, Purna Pavan Chandra Aekkaladevi, Stanislav Kinsburskii, Uros
Bizjak)

- PREEMPT_RT fixes for vmbus interrupts (Jan Kiszka)

* tag 'hyperv-next-signed-20260218' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux: (34 commits)
mshv: Handle insufficient root memory hypervisor statuses
mshv: Handle insufficient contiguous memory hypervisor status
mshv: Introduce hv_deposit_memory helper functions
mshv: Introduce hv_result_needs_memory() helper function
mshv: Add SMT_ENABLED_GUEST partition creation flag
mshv: Add nested virtualization creation flag
Drivers: hv: vmbus: Simplify allocation of vmbus_evt
mshv: expose the scrub partition hypercall
mshv: Add support for integrated scheduler
mshv: Use try_cmpxchg() instead of cmpxchg()
x86/hyperv: Fix error pointer dereference
x86/hyperv: Reserve 3 interrupt vectors used exclusively by MSHV
Drivers: hv: vmbus: Use kthread for vmbus interrupts on PREEMPT_RT
x86/hyperv: Remove ASM_CALL_CONSTRAINT with VMMCALL insn
x86/hyperv: Use savesegment() instead of inline asm() to save segment registers
mshv: fix SRCU protection in irqfd resampler ack handler
mshv: make field names descriptive in a header struct
x86/hyperv: Update comment in hyperv_cleanup()
mshv: clear eventfd counter on irqfd shutdown
x86/hyperv: Use memremap()/memunmap() instead of ioremap_cache()/iounmap()
...

arch/x86/hyperv/hv_crash.c

···
 static noinline __noclone void crash_nmi_callback(struct pt_regs *regs)
 {
 	struct hv_input_disable_hyp_ex *input;
-	u64 status;
 	int msecs = 1000, ccpu = smp_processor_id();
 
 	if (ccpu == 0) {
···
 	input->rip = trampoline_pa;
 	input->arg = devirt_arg;
 
-	status = hv_do_hypercall(HVCALL_DISABLE_HYP_EX, input, NULL);
+	(void)hv_do_hypercall(HVCALL_DISABLE_HYP_EX, input, NULL);
 
 	hv_panic_timeout_reboot();
 }

arch/x86/hyperv/hv_init.c

···
 	 */
 	rdmsrq(MSR_AMD64_SEV_ES_GHCB, ghcb_gpa);
 
-	/* Mask out vTOM bit. ioremap_cache() maps decrypted */
+	/* Mask out vTOM bit and map as decrypted */
 	ghcb_gpa &= ~ms_hyperv.shared_gpa_boundary;
-	ghcb_va = (void *)ioremap_cache(ghcb_gpa, HV_HYP_PAGE_SIZE);
+	ghcb_va = memremap(ghcb_gpa, HV_HYP_PAGE_SIZE, MEMREMAP_WB | MEMREMAP_DEC);
 	if (!ghcb_va)
 		return -ENOMEM;
 
···
 	if (hv_ghcb_pg) {
 		ghcb_va = (void **)this_cpu_ptr(hv_ghcb_pg);
 		if (*ghcb_va)
-			iounmap(*ghcb_va);
+			memunmap(*ghcb_va);
 		*ghcb_va = NULL;
 	}
 
···
 		memunmap(src);
 
 		hv_remap_tsc_clocksource();
-		hv_root_crash_init();
 		hv_sleep_notifiers_register();
 	} else {
 		hypercall_msr.guest_physical_address = vmalloc_to_pfn(hv_hypercall_pg);
···
 	}
 
 	hv_set_hypercall_pg(hv_hypercall_pg);
+
+	if (hv_root_partition())        /* after set hypercall pg */
+		hv_root_crash_init();
 
 skip_hypercall_pg_init:
 	/*
···
 	hv_ivm_msr_write(HV_X64_MSR_GUEST_OS_ID, 0);
 
 	/*
-	 * Reset hypercall page reference before reset the page,
-	 * let hypercall operations fail safely rather than
-	 * panic the kernel for using invalid hypercall page
+	 * Reset hv_hypercall_pg before resetting it in the hypervisor.
+	 * hv_set_hypercall_pg(NULL) is not used because at this point in the
+	 * panic path other CPUs have been stopped, causing static_call_update()
+	 * to hang. So resetting hv_hypercall_pg to cause hypercalls to fail
+	 * cleanly is only operative on 32-bit builds. But this is OK as it is
+	 * just a preventative measure to ease detecting a hypercall being made
+	 * after this point, which shouldn't be happening anyway.
 	 */
 	hv_hypercall_pg = NULL;
 

arch/x86/hyperv/hv_vtl.c

···
 
 static int hv_vtl_bringup_vcpu(u32 target_vp_index, int cpu, u64 eip_ignored)
 {
-	u64 status;
+	u64 status, rsp, rip;
 	int ret = 0;
 	struct hv_enable_vp_vtl *input;
 	unsigned long irq_flags;
···
 	struct desc_struct *gdt;
 
 	struct task_struct *idle = idle_thread_get(cpu);
-	u64 rsp = (unsigned long)idle->thread.sp;
+	if (IS_ERR(idle))
+		return PTR_ERR(idle);
 
-	u64 rip = (u64)&hv_vtl_ap_entry;
+	rsp = (unsigned long)idle->thread.sp;
+	rip = (u64)&hv_vtl_ap_entry;
 
 	native_store_gdt(&gdt_ptr);
 	store_idt(&idt_ptr);

arch/x86/hyperv/ivm.c

···
 #include <asm/e820/api.h>
 #include <asm/desc.h>
 #include <asm/msr.h>
+#include <asm/segment.h>
 #include <uapi/asm/vmx.h>
 
 #ifdef CONFIG_AMD_MEM_ENCRYPT
···
 	vmsa->gdtr.base = gdtr.address;
 	vmsa->gdtr.limit = gdtr.size;
 
-	asm volatile("movl %%es, %%eax;" : "=a" (vmsa->es.selector));
+	savesegment(es, vmsa->es.selector);
 	hv_populate_vmcb_seg(vmsa->es, vmsa->gdtr.base);
 
-	asm volatile("movl %%cs, %%eax;" : "=a" (vmsa->cs.selector));
+	savesegment(cs, vmsa->cs.selector);
 	hv_populate_vmcb_seg(vmsa->cs, vmsa->gdtr.base);
 
-	asm volatile("movl %%ss, %%eax;" : "=a" (vmsa->ss.selector));
+	savesegment(ss, vmsa->ss.selector);
 	hv_populate_vmcb_seg(vmsa->ss, vmsa->gdtr.base);
 
-	asm volatile("movl %%ds, %%eax;" : "=a" (vmsa->ds.selector));
+	savesegment(ds, vmsa->ds.selector);
 	hv_populate_vmcb_seg(vmsa->ds, vmsa->gdtr.base);
 
 	vmsa->efer = native_read_msr(MSR_EFER);
···
 
 	register u64 __r8 asm("r8") = param2;
 	asm volatile("vmmcall"
-		     : "=a" (hv_status), ASM_CALL_CONSTRAINT,
+		     : "=a" (hv_status),
 		       "+c" (control), "+d" (param1), "+r" (__r8)
 		     : : "cc", "memory", "r9", "r10", "r11");
 

arch/x86/kernel/cpu/mshyperv.c

···
 }
 EXPORT_SYMBOL_GPL(hv_get_hypervisor_version);
 
+/*
+ * Reserved vectors hard coded in the hypervisor. If used outside, the hypervisor
+ * will either crash or hang or attempt to break into debugger.
+ */
+static void hv_reserve_irq_vectors(void)
+{
+	#define HYPERV_DBG_FASTFAIL_VECTOR	0x29
+	#define HYPERV_DBG_ASSERT_VECTOR	0x2C
+	#define HYPERV_DBG_SERVICE_VECTOR	0x2D
+
+	if (cpu_feature_enabled(X86_FEATURE_FRED))
+		return;
+
+	if (test_and_set_bit(HYPERV_DBG_ASSERT_VECTOR, system_vectors) ||
+	    test_and_set_bit(HYPERV_DBG_SERVICE_VECTOR, system_vectors) ||
+	    test_and_set_bit(HYPERV_DBG_FASTFAIL_VECTOR, system_vectors))
+		BUG();
+
+	pr_info("Hyper-V: reserve vectors: %d %d %d\n", HYPERV_DBG_ASSERT_VECTOR,
+		HYPERV_DBG_SERVICE_VECTOR, HYPERV_DBG_FASTFAIL_VECTOR);
+}
+
 static void __init ms_hyperv_init_platform(void)
 {
 	int hv_max_functions_eax, eax;
···
 		 ms_hyperv.max_vp_index, ms_hyperv.max_lp_index);
 
 	hv_identify_partition_type();
+
+	if (hv_root_partition())
+		hv_reserve_irq_vectors();
 
 	if (cc_platform_has(CC_ATTR_SNP_SECURE_AVIC))
 		ms_hyperv.hints |= HV_DEPRECATING_AEOI_RECOMMENDED;

drivers/hv/Makefile

···
 hv_utils-y := hv_util.o hv_kvp.o hv_snapshot.o hv_utils_transport.o
 mshv_root-y := mshv_root_main.o mshv_synic.o mshv_eventfd.o mshv_irq.o \
 	       mshv_root_hv_call.o mshv_portid_table.o mshv_regions.o
+mshv_root-$(CONFIG_DEBUG_FS) += mshv_debugfs.o
 mshv_vtl-y := mshv_vtl_main.o
 
 # Code that must be built-in

drivers/hv/hv.c

···
 	simp.simp_enabled = 1;
 
 	if (ms_hyperv.paravisor_present || hv_root_partition()) {
-		/* Mask out vTOM bit. ioremap_cache() maps decrypted */
+		/* Mask out vTOM bit and map as decrypted */
 		u64 base = (simp.base_simp_gpa << HV_HYP_PAGE_SHIFT) &
 				~ms_hyperv.shared_gpa_boundary;
 		hv_cpu->hyp_synic_message_page =
-			(void *)ioremap_cache(base, HV_HYP_PAGE_SIZE);
+			memremap(base, HV_HYP_PAGE_SIZE, MEMREMAP_WB | MEMREMAP_DEC);
 		if (!hv_cpu->hyp_synic_message_page)
 			pr_err("Fail to map synic message page.\n");
 	} else {
···
 	siefp.siefp_enabled = 1;
 
 	if (ms_hyperv.paravisor_present || hv_root_partition()) {
-		/* Mask out vTOM bit. ioremap_cache() maps decrypted */
+		/* Mask out vTOM bit and map as decrypted */
 		u64 base = (siefp.base_siefp_gpa << HV_HYP_PAGE_SHIFT) &
 				~ms_hyperv.shared_gpa_boundary;
 		hv_cpu->hyp_synic_event_page =
-			(void *)ioremap_cache(base, HV_HYP_PAGE_SIZE);
+			memremap(base, HV_HYP_PAGE_SIZE, MEMREMAP_WB | MEMREMAP_DEC);
 		if (!hv_cpu->hyp_synic_event_page)
 			pr_err("Fail to map synic event page.\n");
 	} else {
···
 	simp.simp_enabled = 0;
 	if (ms_hyperv.paravisor_present || hv_root_partition()) {
 		if (hv_cpu->hyp_synic_message_page) {
-			iounmap(hv_cpu->hyp_synic_message_page);
+			memunmap(hv_cpu->hyp_synic_message_page);
 			hv_cpu->hyp_synic_message_page = NULL;
 		}
 	} else {
···
 
 	if (ms_hyperv.paravisor_present || hv_root_partition()) {
 		if (hv_cpu->hyp_synic_event_page) {
-			iounmap(hv_cpu->hyp_synic_event_page);
+			memunmap(hv_cpu->hyp_synic_event_page);
 			hv_cpu->hyp_synic_event_page = NULL;
 		}
 	} else {

drivers/hv/hv_common.c

···
 	_STATUS_INFO(HV_STATUS_UNKNOWN_PROPERTY,		-EIO),
 	_STATUS_INFO(HV_STATUS_PROPERTY_VALUE_OUT_OF_RANGE,	-EIO),
 	_STATUS_INFO(HV_STATUS_INSUFFICIENT_MEMORY,		-ENOMEM),
+	_STATUS_INFO(HV_STATUS_INSUFFICIENT_CONTIGUOUS_MEMORY,	-ENOMEM),
+	_STATUS_INFO(HV_STATUS_INSUFFICIENT_ROOT_MEMORY,	-ENOMEM),
+	_STATUS_INFO(HV_STATUS_INSUFFICIENT_CONTIGUOUS_ROOT_MEMORY,	-ENOMEM),
 	_STATUS_INFO(HV_STATUS_INVALID_PARTITION_ID,		-EINVAL),
 	_STATUS_INFO(HV_STATUS_INVALID_VP_INDEX,		-EINVAL),
 	_STATUS_INFO(HV_STATUS_NOT_FOUND,			-EIO),

drivers/hv/hv_proc.c

···
 }
 EXPORT_SYMBOL_GPL(hv_call_deposit_pages);
 
+int hv_deposit_memory_node(int node, u64 partition_id,
+			   u64 hv_status)
+{
+	u32 num_pages = 1;
+
+	switch (hv_result(hv_status)) {
+	case HV_STATUS_INSUFFICIENT_MEMORY:
+		break;
+	case HV_STATUS_INSUFFICIENT_CONTIGUOUS_MEMORY:
+		num_pages = HV_MAX_CONTIGUOUS_ALLOCATION_PAGES;
+		break;
+
+	case HV_STATUS_INSUFFICIENT_CONTIGUOUS_ROOT_MEMORY:
+		num_pages = HV_MAX_CONTIGUOUS_ALLOCATION_PAGES;
+		fallthrough;
+	case HV_STATUS_INSUFFICIENT_ROOT_MEMORY:
+		if (!hv_root_partition()) {
+			hv_status_err(hv_status, "Unexpected root memory deposit\n");
+			return -ENOMEM;
+		}
+		partition_id = HV_PARTITION_ID_SELF;
+		break;
+
+	default:
+		hv_status_err(hv_status, "Unexpected!\n");
+		return -ENOMEM;
+	}
+	return hv_call_deposit_pages(node, partition_id, num_pages);
+}
+EXPORT_SYMBOL_GPL(hv_deposit_memory_node);
+
+bool hv_result_needs_memory(u64 status)
+{
+	switch (hv_result(status)) {
+	case HV_STATUS_INSUFFICIENT_MEMORY:
+	case HV_STATUS_INSUFFICIENT_CONTIGUOUS_MEMORY:
+	case HV_STATUS_INSUFFICIENT_ROOT_MEMORY:
+	case HV_STATUS_INSUFFICIENT_CONTIGUOUS_ROOT_MEMORY:
+		return true;
+	}
+	return false;
+}
+EXPORT_SYMBOL_GPL(hv_result_needs_memory);
+
 int hv_call_add_logical_proc(int node, u32 lp_index, u32 apic_id)
 {
 	struct hv_input_add_logical_processor *input;
···
 					 input, output);
 		local_irq_restore(flags);
 
-		if (hv_result(status) != HV_STATUS_INSUFFICIENT_MEMORY) {
+		if (!hv_result_needs_memory(status)) {
 			if (!hv_result_success(status)) {
 				hv_status_err(status, "cpu %u apic ID: %u\n",
 					      lp_index, apic_id);
···
 			}
 			break;
 		}
-		ret = hv_call_deposit_pages(node, hv_current_partition_id, 1);
+		ret = hv_deposit_memory_node(node, hv_current_partition_id,
+					     status);
 	} while (!ret);
 
 	return ret;
···
 		status = hv_do_hypercall(HVCALL_CREATE_VP, input, NULL);
 		local_irq_restore(irq_flags);
 
-		if (hv_result(status) != HV_STATUS_INSUFFICIENT_MEMORY) {
+		if (!hv_result_needs_memory(status)) {
 			if (!hv_result_success(status)) {
 				hv_status_err(status, "vcpu: %u, lp: %u\n",
 					      vp_index, flags);
···
 			}
 			break;
 		}
-		ret = hv_call_deposit_pages(node, partition_id, 1);
+		ret = hv_deposit_memory_node(node, partition_id, status);
 
 	} while (!ret);
 

drivers/hv/hyperv_vmbus.h

···
 	 * CHANNELMSG_UNLOAD_RESPONSE and we don't care about other messages
 	 * on crash.
 	 */
-	if (cmpxchg(&msg->header.message_type, old_msg_type,
-		    HVMSG_NONE) != old_msg_type)
+	if (!try_cmpxchg(&msg->header.message_type,
+			 &old_msg_type, HVMSG_NONE))
 		return;
 
 	/*

drivers/hv/mshv_debugfs.c

···
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2026, Microsoft Corporation.
+ *
+ * The /sys/kernel/debug/mshv directory contents.
+ * Contains various statistics data, provided by the hypervisor.
+ *
+ * Authors: Microsoft Linux virtualization team
+ */
+
+#include <linux/debugfs.h>
+#include <linux/stringify.h>
+#include <asm/mshyperv.h>
+#include <linux/slab.h>
+
+#include "mshv.h"
+#include "mshv_root.h"
+
+/* Ensure this file is not used elsewhere by accident */
+#define MSHV_DEBUGFS_C
+#include "mshv_debugfs_counters.c"
+
+#define U32_BUF_SZ 11
+#define U64_BUF_SZ 21
+/* Only support SELF and PARENT areas */
+#define NUM_STATS_AREAS 2
+static_assert(HV_STATS_AREA_SELF == 0 && HV_STATS_AREA_PARENT == 1,
+	      "SELF and PARENT areas must be usable as indices into an array of size NUM_STATS_AREAS");
+/* HV_HYPERVISOR_COUNTER */
+#define HV_HYPERVISOR_COUNTER_LOGICAL_PROCESSORS 1
+
+static struct dentry *mshv_debugfs;
+static struct dentry *mshv_debugfs_partition;
+static struct dentry *mshv_debugfs_lp;
+static struct dentry **parent_vp_stats;
+static struct dentry *parent_partition_stats;
+
+static u64 mshv_lps_count;
+static struct hv_stats_page **mshv_lps_stats;
+
+static int lp_stats_show(struct seq_file *m, void *v)
+{
+	const struct hv_stats_page *stats = m->private;
+	int idx;
+
+	for (idx = 0; idx < ARRAY_SIZE(hv_lp_counters); idx++) {
+		char *name = hv_lp_counters[idx];
+
+		if (!name)
+			continue;
+		seq_printf(m, "%-32s: %llu\n", name, stats->data[idx]);
+	}
+
+	return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(lp_stats);
+
+static void mshv_lp_stats_unmap(u32 lp_index)
+{
+	union hv_stats_object_identity identity = {
+		.lp.lp_index = lp_index,
+		.lp.stats_area_type = HV_STATS_AREA_SELF,
+	};
+	int err;
+
+	err = hv_unmap_stats_page(HV_STATS_OBJECT_LOGICAL_PROCESSOR,
+				  mshv_lps_stats[lp_index], &identity);
+	if (err)
+		pr_err("%s: failed to unmap logical processor %u stats, err: %d\n",
+		       __func__, lp_index, err);
+
+	mshv_lps_stats[lp_index] = NULL;
+}
+
+static struct hv_stats_page * __init mshv_lp_stats_map(u32 lp_index)
+{
+	union hv_stats_object_identity identity = {
+		.lp.lp_index = lp_index,
+		.lp.stats_area_type = HV_STATS_AREA_SELF,
+	};
+	struct hv_stats_page *stats;
+	int err;
+
+	err = hv_map_stats_page(HV_STATS_OBJECT_LOGICAL_PROCESSOR, &identity,
+				&stats);
+	if (err) {
+		pr_err("%s: failed to map logical processor %u stats, err: %d\n",
+		       __func__, lp_index, err);
+		return ERR_PTR(err);
+	}
+	mshv_lps_stats[lp_index] = stats;
+
+	return stats;
+}
+
+static struct hv_stats_page * __init lp_debugfs_stats_create(u32 lp_index,
+							     struct dentry *parent)
+{
+	struct dentry *dentry;
+	struct hv_stats_page *stats;
+
+	stats = mshv_lp_stats_map(lp_index);
+	if (IS_ERR(stats))
+		return stats;
+
+	dentry = debugfs_create_file("stats", 0400, parent,
+				     stats, &lp_stats_fops);
+	if (IS_ERR(dentry)) {
+		mshv_lp_stats_unmap(lp_index);
+		return ERR_CAST(dentry);
+	}
+	return stats;
+}
+
+static int __init lp_debugfs_create(u32 lp_index, struct dentry *parent)
+{
+	struct dentry *idx;
+	char lp_idx_str[U32_BUF_SZ];
+	struct hv_stats_page *stats;
+	int err;
+
+	sprintf(lp_idx_str, "%u", lp_index);
+
+	idx = debugfs_create_dir(lp_idx_str, parent);
+	if (IS_ERR(idx))
+		return PTR_ERR(idx);
+
+	stats = lp_debugfs_stats_create(lp_index, idx);
+	if (IS_ERR(stats)) {
+		err = PTR_ERR(stats);
+		goto remove_debugfs_lp_idx;
+	}
+
+	return 0;
+
+remove_debugfs_lp_idx:
+	debugfs_remove_recursive(idx);
+	return err;
+}
+
+static void mshv_debugfs_lp_remove(void)
+{
+	int lp_index;
+
+	debugfs_remove_recursive(mshv_debugfs_lp);
+
+	for (lp_index = 0; lp_index < mshv_lps_count; lp_index++)
+		mshv_lp_stats_unmap(lp_index);
+
+	kfree(mshv_lps_stats);
+	mshv_lps_stats = NULL;
+}
+
+static int __init mshv_debugfs_lp_create(struct dentry *parent)
+{
+	struct dentry *lp_dir;
+	int err, lp_index;
+
+	mshv_lps_stats = kcalloc(mshv_lps_count,
+				 sizeof(*mshv_lps_stats),
+				 GFP_KERNEL_ACCOUNT);
+
+	if (!mshv_lps_stats)
+		return -ENOMEM;
+
+	lp_dir = debugfs_create_dir("lp", parent);
+	if (IS_ERR(lp_dir)) {
+		err = PTR_ERR(lp_dir);
+		goto free_lp_stats;
+	}
+
+	for (lp_index = 0; lp_index < mshv_lps_count; lp_index++) {
+		err = lp_debugfs_create(lp_index, lp_dir);
+		if (err)
+			goto remove_debugfs_lps;
+	}
+
+	mshv_debugfs_lp = lp_dir;
+
+	return 0;
+
+remove_debugfs_lps:
+	for (lp_index -= 1; lp_index >= 0; lp_index--)
+		mshv_lp_stats_unmap(lp_index);
+	debugfs_remove_recursive(lp_dir);
+free_lp_stats:
+	kfree(mshv_lps_stats);
+	mshv_lps_stats = NULL;
+
+	return err;
+}
+
+static int vp_stats_show(struct seq_file *m, void *v)
+{
+	const struct hv_stats_page **pstats = m->private;
+	u64 parent_val, self_val;
+	int idx;
+
+	/*
+	 * For VP and partition stats, there may be two stats areas mapped,
+	 * SELF and PARENT. These refer to the privilege level of the data in
+	 * each page. Some fields may be 0 in SELF and nonzero in PARENT, or
+	 * vice versa.
+	 *
+	 * Hence, prioritize printing from the PARENT page (more privileged
+	 * data), but use the value from the SELF page if the PARENT value is
+	 * 0.
+	 */
+
+	for (idx = 0; idx < ARRAY_SIZE(hv_vp_counters); idx++) {
+		char *name = hv_vp_counters[idx];
+
+		if (!name)
+			continue;
+
+		parent_val = pstats[HV_STATS_AREA_PARENT]->data[idx];
+		self_val = pstats[HV_STATS_AREA_SELF]->data[idx];
+		seq_printf(m, "%-43s: %llu\n", name,
+			   parent_val ? parent_val : self_val);
+	}
+
+	return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(vp_stats);
+
+static void vp_debugfs_remove(struct dentry *vp_stats)
+{
+	debugfs_remove_recursive(vp_stats->d_parent);
+}
+
+static int vp_debugfs_create(u64 partition_id, u32 vp_index,
+			     struct hv_stats_page **pstats,
+			     struct dentry **vp_stats_ptr,
+			     struct dentry *parent)
+{
+	struct dentry *vp_idx_dir, *d;
+	char vp_idx_str[U32_BUF_SZ];
+	int err;
+
+	sprintf(vp_idx_str, "%u", vp_index);
+
+	vp_idx_dir = debugfs_create_dir(vp_idx_str, parent);
+	if (IS_ERR(vp_idx_dir))
+		return PTR_ERR(vp_idx_dir);
+
+	d = debugfs_create_file("stats", 0400, vp_idx_dir,
+				pstats, &vp_stats_fops);
+	if (IS_ERR(d)) {
+		err = PTR_ERR(d);
+		goto remove_debugfs_vp_idx;
+	}
+
+	*vp_stats_ptr = d;
+
+	return 0;
+
+remove_debugfs_vp_idx:
+	debugfs_remove_recursive(vp_idx_dir);
+	return err;
+}
+
+static int partition_stats_show(struct seq_file *m, void *v)
+{
+	const struct hv_stats_page **pstats = m->private;
+	u64 parent_val, self_val;
+	int idx;
+
+	for (idx = 0; idx < ARRAY_SIZE(hv_partition_counters); idx++) {
+		char *name = hv_partition_counters[idx];
+
+		if (!name)
+			continue;
+
+		parent_val = pstats[HV_STATS_AREA_PARENT]->data[idx];
+		self_val = pstats[HV_STATS_AREA_SELF]->data[idx];
+		seq_printf(m, "%-37s: %llu\n", name,
+			   parent_val ? parent_val : self_val);
+	}
+
+	return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(partition_stats);
+
+static void mshv_partition_stats_unmap(u64 partition_id,
+				       struct hv_stats_page *stats_page,
+				       enum hv_stats_area_type stats_area_type)
+{
+	union hv_stats_object_identity identity = {
+		.partition.partition_id = partition_id,
+		.partition.stats_area_type = stats_area_type,
+	};
+	int err;
+
+	err = hv_unmap_stats_page(HV_STATS_OBJECT_PARTITION, stats_page,
+				  &identity);
+	if (err)
+		pr_err("%s: failed to unmap partition %lld %s stats, err: %d\n",
+		       __func__, partition_id,
+		       (stats_area_type == HV_STATS_AREA_SELF) ? "self" : "parent",
+		       err);
+}
+
+static struct hv_stats_page *mshv_partition_stats_map(u64 partition_id,
+						      enum hv_stats_area_type stats_area_type)
+{
+	union hv_stats_object_identity identity = {
+		.partition.partition_id = partition_id,
+		.partition.stats_area_type = stats_area_type,
+	};
+	struct hv_stats_page *stats;
+	int err;
+
+	err = hv_map_stats_page(HV_STATS_OBJECT_PARTITION, &identity, &stats);
+	if (err) {
+		pr_err("%s: failed to map partition %lld %s stats, err: %d\n",
+		       __func__, partition_id,
+		       (stats_area_type == HV_STATS_AREA_SELF) ? "self" : "parent",
+		       err);
+		return ERR_PTR(err);
+	}
+	return stats;
+}
+
+static int mshv_debugfs_partition_stats_create(u64 partition_id,
+					       struct dentry **partition_stats_ptr,
+					       struct dentry *parent)
+{
+	struct dentry *dentry;
+	struct hv_stats_page **pstats;
+	int err;
+
+	pstats = kcalloc(NUM_STATS_AREAS, sizeof(struct hv_stats_page *),
+			 GFP_KERNEL_ACCOUNT);
+	if (!pstats)
+		return -ENOMEM;
+
+	pstats[HV_STATS_AREA_SELF] = mshv_partition_stats_map(partition_id,
+							      HV_STATS_AREA_SELF);
+	if (IS_ERR(pstats[HV_STATS_AREA_SELF])) {
+		err = PTR_ERR(pstats[HV_STATS_AREA_SELF]);
+		goto cleanup;
+	}
+
+	/*
+	 * L1VH partition cannot access its partition stats in parent area.
+	 */
+	if (is_l1vh_parent(partition_id)) {
+		pstats[HV_STATS_AREA_PARENT] = pstats[HV_STATS_AREA_SELF];
+	} else {
+		pstats[HV_STATS_AREA_PARENT] = mshv_partition_stats_map(partition_id,
+									HV_STATS_AREA_PARENT);
+		if (IS_ERR(pstats[HV_STATS_AREA_PARENT])) {
+			err = PTR_ERR(pstats[HV_STATS_AREA_PARENT]);
+			goto unmap_self;
+		}
+		if (!pstats[HV_STATS_AREA_PARENT])
+			pstats[HV_STATS_AREA_PARENT] = pstats[HV_STATS_AREA_SELF];
+	}
+
+	dentry = debugfs_create_file("stats", 0400, parent,
+				     pstats, &partition_stats_fops);
+	if (IS_ERR(dentry)) {
+		err = PTR_ERR(dentry);
+		goto unmap_partition_stats;
+	}
+
+	*partition_stats_ptr = dentry;
+	return 0;
+
+unmap_partition_stats:
+	if (pstats[HV_STATS_AREA_PARENT] != pstats[HV_STATS_AREA_SELF])
+		mshv_partition_stats_unmap(partition_id, pstats[HV_STATS_AREA_PARENT],
+					   HV_STATS_AREA_PARENT);
+unmap_self:
+	mshv_partition_stats_unmap(partition_id, pstats[HV_STATS_AREA_SELF],
+				   HV_STATS_AREA_SELF);
+cleanup:
+	kfree(pstats);
+	return err;
+}
+
+static void partition_debugfs_remove(u64 partition_id, struct dentry *dentry)
+{
+	struct hv_stats_page **pstats = NULL;
+
+	pstats = dentry->d_inode->i_private;
+
+	debugfs_remove_recursive(dentry->d_parent);
+
+	if (pstats[HV_STATS_AREA_PARENT] != pstats[HV_STATS_AREA_SELF]) {
+		mshv_partition_stats_unmap(partition_id,
+					   pstats[HV_STATS_AREA_PARENT],
+					   HV_STATS_AREA_PARENT);
+	}
+
+	mshv_partition_stats_unmap(partition_id,
+				   pstats[HV_STATS_AREA_SELF],
+				   HV_STATS_AREA_SELF);
+
+	kfree(pstats);
+}
+
+static int partition_debugfs_create(u64 partition_id,
+				    struct dentry **vp_dir_ptr,
+				    struct dentry **partition_stats_ptr,
+				    struct dentry *parent)
+{
+	char part_id_str[U64_BUF_SZ];
+	struct dentry *part_id_dir, *vp_dir;
+	int err;
+
+	if (is_l1vh_parent(partition_id))
+		sprintf(part_id_str, "self");
+	else
+		sprintf(part_id_str, "%llu", partition_id);
+
+	part_id_dir = debugfs_create_dir(part_id_str, parent);
+	if (IS_ERR(part_id_dir))
+		return PTR_ERR(part_id_dir);
+
+	vp_dir = debugfs_create_dir("vp", part_id_dir);
+	if (IS_ERR(vp_dir)) {
+		err = PTR_ERR(vp_dir);
+		goto remove_debugfs_partition_id;
+	}
+
+	err = mshv_debugfs_partition_stats_create(partition_id,
+						  partition_stats_ptr,
+						  part_id_dir);
+	if (err)
+		goto remove_debugfs_partition_id;
+
+	*vp_dir_ptr = vp_dir;
+
+	return 0;
+
+remove_debugfs_partition_id:
+	debugfs_remove_recursive(part_id_dir);
+	return err;
+}
+
+static void parent_vp_debugfs_remove(u32 vp_index,
+				     struct dentry *vp_stats_ptr)
+{
+	struct hv_stats_page **pstats;
+
+	pstats = vp_stats_ptr->d_inode->i_private;
+	vp_debugfs_remove(vp_stats_ptr);
+	mshv_vp_stats_unmap(hv_current_partition_id, vp_index, pstats);
+	kfree(pstats);
+}
+
+static void mshv_debugfs_parent_partition_remove(void)
+{
+	int idx;
+
+	for_each_online_cpu(idx)
+		parent_vp_debugfs_remove(hv_vp_index[idx],
+					 parent_vp_stats[idx]);
+
+	partition_debugfs_remove(hv_current_partition_id,
+				 parent_partition_stats);
+	kfree(parent_vp_stats);
+	parent_vp_stats = NULL;
+	parent_partition_stats = NULL;
+}
+
+static int __init parent_vp_debugfs_create(u32 vp_index,
+					   struct dentry **vp_stats_ptr,
+					   struct dentry *parent)
+{
+	struct hv_stats_page **pstats;
+	int err;
+
+	pstats = kcalloc(NUM_STATS_AREAS, sizeof(struct hv_stats_page *),
+			 GFP_KERNEL_ACCOUNT);
+	if (!pstats)
+		return -ENOMEM;
+
+	err = mshv_vp_stats_map(hv_current_partition_id, vp_index, pstats);
+	if (err)
+		goto cleanup;
+
+	err = vp_debugfs_create(hv_current_partition_id, vp_index, pstats,
+				vp_stats_ptr, parent);
+	if (err)
+		goto unmap_vp_stats;
+
+	return 0;
+
+unmap_vp_stats:
+	mshv_vp_stats_unmap(hv_current_partition_id, vp_index, pstats);
+cleanup:
+	kfree(pstats);
+	return err;
+}
+
+static int __init mshv_debugfs_parent_partition_create(void)
+{
+	struct dentry *vp_dir;
+	int err, idx, i;
+
+	mshv_debugfs_partition = debugfs_create_dir("partition",
+						    mshv_debugfs);
+	if (IS_ERR(mshv_debugfs_partition))
+		return PTR_ERR(mshv_debugfs_partition);
+
+	err = partition_debugfs_create(hv_current_partition_id,
+				       &vp_dir,
+				       &parent_partition_stats,
+				       mshv_debugfs_partition);
+	if (err)
+		goto remove_debugfs_partition;
+
+	parent_vp_stats = kcalloc(nr_cpu_ids, sizeof(*parent_vp_stats),
+				  GFP_KERNEL);
+	if (!parent_vp_stats) {
+		err = -ENOMEM;
+		goto remove_debugfs_partition;
+	}
+
+	for_each_online_cpu(idx) {
+		err = parent_vp_debugfs_create(hv_vp_index[idx],
+					       &parent_vp_stats[idx],
+					       vp_dir);
+		if (err)
+			goto remove_debugfs_partition_vp;
+	}
+
+	return 0;
+
+remove_debugfs_partition_vp:
+	for_each_online_cpu(i) {
+		if (i >= idx)
+			break;
+		parent_vp_debugfs_remove(i, parent_vp_stats[i]);
+	}
+	partition_debugfs_remove(hv_current_partition_id,
+				 parent_partition_stats);
+
+	kfree(parent_vp_stats);
+	parent_vp_stats = NULL;
+	parent_partition_stats = NULL;
+
+remove_debugfs_partition:
+	debugfs_remove_recursive(mshv_debugfs_partition);
+	mshv_debugfs_partition = NULL;
+	return err;
+}
+
+static int hv_stats_show(struct seq_file *m, void *v)
+{
+	const struct hv_stats_page *stats = m->private;
+	int idx;
+
+	for (idx = 0; idx < ARRAY_SIZE(hv_hypervisor_counters); idx++) {
+		char *name = hv_hypervisor_counters[idx];
+
+		if (!name)
+			continue;
+		seq_printf(m, "%-27s: %llu\n", name, stats->data[idx]);
+	}
+
+	return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(hv_stats);
+
+static void mshv_hv_stats_unmap(void)
+{
+	union hv_stats_object_identity identity = {
+		.hv.stats_area_type = HV_STATS_AREA_SELF,
+	};
+	int err;
+
+	err = hv_unmap_stats_page(HV_STATS_OBJECT_HYPERVISOR, NULL, &identity);
+	if (err)
+		pr_err("%s: failed to unmap hypervisor stats: %d\n",
+		       __func__, err);
+}
+
+static void * __init mshv_hv_stats_map(void)
+{
+	union hv_stats_object_identity identity = {
+		.hv.stats_area_type = HV_STATS_AREA_SELF,
+	};
+	struct hv_stats_page *stats;
+	int err;
+
+	err = hv_map_stats_page(HV_STATS_OBJECT_HYPERVISOR, &identity, &stats);
+	if (err) {
+		pr_err("%s: failed to map hypervisor stats: %d\n",
+		       __func__, err);
+		return ERR_PTR(err);
+	}
+	return stats;
+}
+
+static int __init mshv_debugfs_hv_stats_create(struct dentry *parent)
+{
+	struct dentry *dentry;
+	u64 *stats;
+	int err;
+
+	stats = mshv_hv_stats_map();
+	if (IS_ERR(stats))
+		return PTR_ERR(stats);
+
+	dentry = debugfs_create_file("stats", 0400, parent,
+				     stats, &hv_stats_fops);
+	if (IS_ERR(dentry)) {
+		err = PTR_ERR(dentry);
+		pr_err("%s: failed to create hypervisor stats dentry: %d\n",
+		       __func__, err);
+		goto unmap_hv_stats;
+	}
+
+	mshv_lps_count = stats[HV_HYPERVISOR_COUNTER_LOGICAL_PROCESSORS];
+
+	return 0;
+
+unmap_hv_stats:
+	mshv_hv_stats_unmap();
+	return err;
+}
+
+int mshv_debugfs_vp_create(struct mshv_vp *vp)
+{
+	struct mshv_partition *p = vp->vp_partition;
+
+	if (!mshv_debugfs)
+		return 0;
+
+	return vp_debugfs_create(p->pt_id, vp->vp_index,
+				 vp->vp_stats_pages,
+				 &vp->vp_stats_dentry,
+				 p->pt_vp_dentry);
+}
+
+void mshv_debugfs_vp_remove(struct mshv_vp *vp)
+{
+	if (!mshv_debugfs)
+		return;
+
+	vp_debugfs_remove(vp->vp_stats_dentry);
+}
+
+int mshv_debugfs_partition_create(struct mshv_partition *partition)
+{
+	int err;
+
+	if (!mshv_debugfs)
+		return 0;
+
+	err = partition_debugfs_create(partition->pt_id,
+				       &partition->pt_vp_dentry,
+				       &partition->pt_stats_dentry,
+				       mshv_debugfs_partition);
+	if (err)
+		return err;
+
+	return 0;
+}
+
+void mshv_debugfs_partition_remove(struct mshv_partition *partition)
+{
+	if (!mshv_debugfs)
+		return;
+
+	partition_debugfs_remove(partition->pt_id,
+				 partition->pt_stats_dentry);
+}
+
+int __init mshv_debugfs_init(void)
+{
+	int err;
+
+	mshv_debugfs = debugfs_create_dir("mshv", NULL);
+	if (IS_ERR(mshv_debugfs)) {
+		pr_err("%s: failed to create debugfs directory\n", __func__);
+		return PTR_ERR(mshv_debugfs);
+	}
+
+	if (hv_root_partition()) {
+		err = mshv_debugfs_hv_stats_create(mshv_debugfs);
+		if (err)
+			goto remove_mshv_dir;
+
+		err = mshv_debugfs_lp_create(mshv_debugfs);
+		if (err)
+			goto unmap_hv_stats;
+	}
+
+	err = mshv_debugfs_parent_partition_create();
+	if (err)
+		goto unmap_lp_stats;
+
+	return 0;
+
+unmap_lp_stats:
+	if (hv_root_partition()) {
+		mshv_debugfs_lp_remove();
+		mshv_debugfs_lp = NULL;
+	}
+unmap_hv_stats:
+	if (hv_root_partition())
+		mshv_hv_stats_unmap();
+remove_mshv_dir:
+	debugfs_remove_recursive(mshv_debugfs);
+	mshv_debugfs = NULL;
+	return err;
+}
+
+void mshv_debugfs_exit(void)
+{
+	mshv_debugfs_parent_partition_remove();
+
+	if (hv_root_partition()) {
+		mshv_debugfs_lp_remove();
+		mshv_debugfs_lp = NULL;
+		mshv_hv_stats_unmap();
+	}
+
+	debugfs_remove_recursive(mshv_debugfs);
+	mshv_debugfs = NULL;
+	mshv_debugfs_partition = NULL;
+}

drivers/hv/mshv_debugfs_counters.c

···
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2026, Microsoft Corporation.
+ *
+ * Data for printing stats page counters via debugfs.
+ *
+ * Authors: Microsoft Linux virtualization team
+ */
+
+/*
+ * For simplicity, this file is included directly in mshv_debugfs.c.
+ * If these are ever needed elsewhere they should be compiled separately.
+ * Ensure this file is not used twice by accident.
+ */
+#ifndef MSHV_DEBUGFS_C
+#error "This file should only be included in mshv_debugfs.c"
+#endif
+
+/* HV_HYPERVISOR_COUNTER */
+static char *hv_hypervisor_counters[] = {
+	[1] = "HvLogicalProcessors",
+	[2] = "HvPartitions",
+	[3] = "HvTotalPages",
+	[4] = "HvVirtualProcessors",
+	[5] = "HvMonitoredNotifications",
+	[6] = "HvModernStandbyEntries",
+	[7] = "HvPlatformIdleTransitions",
+	[8] = "HvHypervisorStartupCost",
+
+	[10] = "HvIOSpacePages",
+	[11] = "HvNonEssentialPagesForDump",
+	[12] = "HvSubsumedPages",
+};
+
+/* HV_CPU_COUNTER */
+static char *hv_lp_counters[] = {
+	[1] = "LpGlobalTime",
+	[2] = "LpTotalRunTime",
+	[3] = "LpHypervisorRunTime",
+	[4] = "LpHardwareInterrupts",
+	[5] = "LpContextSwitches",
+	[6] = "LpInterProcessorInterrupts",
+	[7] = "LpSchedulerInterrupts",
+	[8] = "LpTimerInterrupts",
+	[9] = "LpInterProcessorInterruptsSent",
+	[10] = "LpProcessorHalts",
+	[11] = "LpMonitorTransitionCost",
+	[12] = "LpContextSwitchTime",
+	[13] = "LpC1TransitionsCount",
+	[14] = "LpC1RunTime",
+	[15] = "LpC2TransitionsCount",
+	[16] = "LpC2RunTime",
+	[17] = "LpC3TransitionsCount",
+	[18] = "LpC3RunTime",
+	[19] = "LpRootVpIndex",
+	[20] = "LpIdleSequenceNumber",
+	[21] = "LpGlobalTscCount",
+	[22] = "LpActiveTscCount",
+	[23] = "LpIdleAccumulation",
+	[24] = "LpReferenceCycleCount0",
+	[25] = "LpActualCycleCount0",
+	[26] = "LpReferenceCycleCount1",
+	[27] = "LpActualCycleCount1",
+	[28] = "LpProximityDomainId",
+	[29] = "LpPostedInterruptNotifications",
+	[30] = "LpBranchPredictorFlushes",
+#if IS_ENABLED(CONFIG_X86_64)
+	[31] = "LpL1DataCacheFlushes",
+	[32] = "LpImmediateL1DataCacheFlushes",
+	[33] = "LpMbFlushes",
+	[34] = "LpCounterRefreshSequenceNumber",
+	[35] = "LpCounterRefreshReferenceTime",
+	[36] = "LpIdleAccumulationSnapshot",
+	[37] = "LpActiveTscCountSnapshot",
+	[38] = "LpHwpRequestContextSwitches",
+	[39] = "LpPlaceholder1",
+	[40] = "LpPlaceholder2",
+	[41] = "LpPlaceholder3",
+	[42] = "LpPlaceholder4",
+	[43] = "LpPlaceholder5",
+	[44] = "LpPlaceholder6",
+	[45] = "LpPlaceholder7",
+	[46] = "LpPlaceholder8",
+	[47] = "LpPlaceholder9",
+	[48] = "LpSchLocalRunListSize",
+	[49] = "LpReserveGroupId",
+	[50] = "LpRunningPriority",
+	[51] = "LpPerfmonInterruptCount",
+#elif IS_ENABLED(CONFIG_ARM64)
+	[31] = "LpCounterRefreshSequenceNumber",
+	[32] = "LpCounterRefreshReferenceTime",
+	[33] = "LpIdleAccumulationSnapshot",
+	[34] = "LpActiveTscCountSnapshot",
+	[35] = "LpHwpRequestContextSwitches",
+	[36] = "LpPlaceholder2",
+	[37] = "LpPlaceholder3",
+	[38] = "LpPlaceholder4",
+	[39] = "LpPlaceholder5",
+	[40] = "LpPlaceholder6",
+	[41] = "LpPlaceholder7",
+	[42] = "LpPlaceholder8",
+	[43] = "LpPlaceholder9",
+	[44] = "LpSchLocalRunListSize",
+	[45] = "LpReserveGroupId",
+	[46] = "LpRunningPriority",
+#endif
+};
+
+/* HV_PROCESS_COUNTER */
+static char *hv_partition_counters[] = {
+	[1] = "PtVirtualProcessors",
+
+	[3] = "PtTlbSize",
+	[4] = "PtAddressSpaces",
+	[5] = "PtDepositedPages",
+	[6] = "PtGpaPages",
+	[7] = "PtGpaSpaceModifications",
+	[8] = "PtVirtualTlbFlushEntires",
+	[9] = "PtRecommendedTlbSize",
+	[10] = "PtGpaPages4K",
+	[11] = "PtGpaPages2M",
+	[12] = "PtGpaPages1G",
+	[13] = "PtGpaPages512G",
+	[14] = "PtDevicePages4K",
+	[15] = "PtDevicePages2M",
+	[16] = "PtDevicePages1G",
+	[17] = "PtDevicePages512G",
+	[18] = "PtAttachedDevices",
+	[19] = "PtDeviceInterruptMappings",
+	[20] = "PtIoTlbFlushes",
+	[21] = "PtIoTlbFlushCost",
+	[22] = "PtDeviceInterruptErrors",
+	[23] = "PtDeviceDmaErrors",
+	[24] = "PtDeviceInterruptThrottleEvents",
+	[25] = "PtSkippedTimerTicks",
+	[26] = "PtPartitionId",
+#if IS_ENABLED(CONFIG_X86_64)
+	[27] = "PtNestedTlbSize",
+	[28] = "PtRecommendedNestedTlbSize",
+	[29] = "PtNestedTlbFreeListSize",
+	[30] = "PtNestedTlbTrimmedPages",
+	[31] = "PtPagesShattered",
+	[32] = "PtPagesRecombined",
+	[33] = "PtHwpRequestValue",
+	[34] = "PtAutoSuspendEnableTime",
+	[35] = "PtAutoSuspendTriggerTime",
+	[36] = "PtAutoSuspendDisableTime",
+	[37] = "PtPlaceholder1",
+	[38] = "PtPlaceholder2",
+	[39] = "PtPlaceholder3",
+	[40] = "PtPlaceholder4",
+	[41] = "PtPlaceholder5",
+	[42] = "PtPlaceholder6",
+	[43] = "PtPlaceholder7",
+	[44] = "PtPlaceholder8",
+	[45] = "PtHypervisorStateTransferGeneration",
+	[46] = "PtNumberofActiveChildPartitions",
+#elif IS_ENABLED(CONFIG_ARM64)
+	[27] = "PtHwpRequestValue",
+	[28] = "PtAutoSuspendEnableTime",
+	[29] = "PtAutoSuspendTriggerTime",
+	[30] = "PtAutoSuspendDisableTime",
+	[31] = "PtPlaceholder1",
+	[32] = "PtPlaceholder2",
+	[33] = "PtPlaceholder3",
+	[34] = "PtPlaceholder4",
+	[35] = "PtPlaceholder5",
+	[36] = "PtPlaceholder6",
+	[37] = "PtPlaceholder7",
+	[38] = "PtPlaceholder8",
+	[39] = "PtHypervisorStateTransferGeneration",
+	[40] = "PtNumberofActiveChildPartitions",
+#endif
+};
+
+/* HV_THREAD_COUNTER */
+static char *hv_vp_counters[] = {
+	[1] = "VpTotalRunTime",
+	[2] = "VpHypervisorRunTime",
+	[3] = "VpRemoteNodeRunTime",
+	[4] = "VpNormalizedRunTime",
+	[5] = "VpIdealCpu",
+
+	[7] = "VpHypercallsCount",
+	[8] = "VpHypercallsTime",
+#if IS_ENABLED(CONFIG_X86_64)
+	[9] = "VpPageInvalidationsCount",
+	[10] = "VpPageInvalidationsTime",
+	[11] = "VpControlRegisterAccessesCount",
+	[12] = "VpControlRegisterAccessesTime",
+	[13] = "VpIoInstructionsCount",
+	[14] = "VpIoInstructionsTime",
+	[15] = "VpHltInstructionsCount",
+	[16] = "VpHltInstructionsTime",
+	[17] = "VpMwaitInstructionsCount",
+	[18] = "VpMwaitInstructionsTime",
+	[19] = "VpCpuidInstructionsCount",
+	[20] = "VpCpuidInstructionsTime",
+	[21] = "VpMsrAccessesCount",
+	[22] = "VpMsrAccessesTime",
+	[23] = "VpOtherInterceptsCount",
+	[24] = "VpOtherInterceptsTime",
+	[25] = "VpExternalInterruptsCount",
+	[26] = "VpExternalInterruptsTime",
+	[27] = "VpPendingInterruptsCount",
+	[28] = "VpPendingInterruptsTime",
+	[29] = "VpEmulatedInstructionsCount",
+	[30] = "VpEmulatedInstructionsTime",
+	[31] = "VpDebugRegisterAccessesCount",
+	[32] = "VpDebugRegisterAccessesTime",
+	[33] = "VpPageFaultInterceptsCount",
+	[34] = "VpPageFaultInterceptsTime",
+	[35] = "VpGuestPageTableMaps",
+	[36] = "VpLargePageTlbFills",
+	[37] = "VpSmallPageTlbFills",
+	[38] = "VpReflectedGuestPageFaults",
+	[39] = "VpApicMmioAccesses",
+	[40] = "VpIoInterceptMessages",
+	[41] = "VpMemoryInterceptMessages",
+	[42] = "VpApicEoiAccesses",
+	[43] = "VpOtherMessages",
+	[44] = "VpPageTableAllocations",
+	[45] = "VpLogicalProcessorMigrations",
+	[46] = "VpAddressSpaceEvictions",
+	[47] = "VpAddressSpaceSwitches",
+	[48] = "VpAddressDomainFlushes",
+	[49] = "VpAddressSpaceFlushes",
+	[50] = "VpGlobalGvaRangeFlushes",
+	[51] = "VpLocalGvaRangeFlushes",
+	[52] = "VpPageTableEvictions",
+	[53] = "VpPageTableReclamations",
+	[54] = "VpPageTableResets",
+	[55] = "VpPageTableValidations",
+	[56] = "VpApicTprAccesses",
+	[57] = "VpPageTableWriteIntercepts",
+	[58] = "VpSyntheticInterrupts",
+	[59] = "VpVirtualInterrupts",
+	[60] = "VpApicIpisSent",
+	[61] = "VpApicSelfIpisSent",
+	[62] = "VpGpaSpaceHypercalls",
+	[63] = "VpLogicalProcessorHypercalls",
+	[64] = "VpLongSpinWaitHypercalls",
+	[65] = "VpOtherHypercalls",
+	[66] = "VpSyntheticInterruptHypercalls",
+	[67] = "VpVirtualInterruptHypercalls",
+	[68] = "VpVirtualMmuHypercalls",
+	[69] = "VpVirtualProcessorHypercalls",
+	[70] = "VpHardwareInterrupts",
+	[71] = "VpNestedPageFaultInterceptsCount",
+	[72] = "VpNestedPageFaultInterceptsTime",
+	[73] = "VpPageScans",
+	[74] = "VpLogicalProcessorDispatches",
+	[75] = "VpWaitingForCpuTime",
+	[76] = "VpExtendedHypercalls",
+	[77] = "VpExtendedHypercallInterceptMessages",
+	[78] = "VpMbecNestedPageTableSwitches",
+	[79] = "VpOtherReflectedGuestExceptions",
+	[80] = "VpGlobalIoTlbFlushes",
+	[81] = "VpGlobalIoTlbFlushCost",
+	[82] = "VpLocalIoTlbFlushes",
+	[83] = "VpLocalIoTlbFlushCost",
+	[84] = "VpHypercallsForwardedCount",
+	[85] = "VpHypercallsForwardingTime",
+	[86] = "VpPageInvalidationsForwardedCount",
+	[87] = "VpPageInvalidationsForwardingTime",
+	[88] = "VpControlRegisterAccessesForwardedCount",
+	[89] = "VpControlRegisterAccessesForwardingTime",
+	[90] = "VpIoInstructionsForwardedCount",
+	[91] = "VpIoInstructionsForwardingTime",
+	[92] = "VpHltInstructionsForwardedCount",
+	[93] = "VpHltInstructionsForwardingTime",
+	[94] = "VpMwaitInstructionsForwardedCount",
+	[95] = "VpMwaitInstructionsForwardingTime",
+	[96] = "VpCpuidInstructionsForwardedCount",
+	[97] = "VpCpuidInstructionsForwardingTime",
+	[98] = "VpMsrAccessesForwardedCount",
+	[99] = "VpMsrAccessesForwardingTime",
+	[100] = "VpOtherInterceptsForwardedCount",
+	[101] = "VpOtherInterceptsForwardingTime",
+	[102] = "VpExternalInterruptsForwardedCount",
+	[103] = "VpExternalInterruptsForwardingTime",
+	[104] = "VpPendingInterruptsForwardedCount",
+	[105] = "VpPendingInterruptsForwardingTime",
+	[106] = "VpEmulatedInstructionsForwardedCount",
+	[107] = "VpEmulatedInstructionsForwardingTime",
+	[108] = "VpDebugRegisterAccessesForwardedCount",
+	[109] = "VpDebugRegisterAccessesForwardingTime",
+	[110] = "VpPageFaultInterceptsForwardedCount",
+	[111] = "VpPageFaultInterceptsForwardingTime",
+	[112] = "VpVmclearEmulationCount",
+	[113] = "VpVmclearEmulationTime",
+	[114] = "VpVmptrldEmulationCount",
+	[115] = "VpVmptrldEmulationTime",
+	[116] = "VpVmptrstEmulationCount",
+	[117] = "VpVmptrstEmulationTime",
+	[118] = "VpVmreadEmulationCount",
+	[119] = "VpVmreadEmulationTime",
+	[120] = "VpVmwriteEmulationCount",
+	[121] = "VpVmwriteEmulationTime",
+	[122] = "VpVmxoffEmulationCount",
+	[123] = "VpVmxoffEmulationTime",
+	[124] = "VpVmxonEmulationCount",
+	[125] = "VpVmxonEmulationTime",
+	[126] = "VpNestedVMEntriesCount",
+	[127] = "VpNestedVMEntriesTime",
+	[128] = "VpNestedSLATSoftPageFaultsCount",
+	[129] = "VpNestedSLATSoftPageFaultsTime",
+	[130] = "VpNestedSLATHardPageFaultsCount",
+	[131] = "VpNestedSLATHardPageFaultsTime",
+	[132] = "VpInvEptAllContextEmulationCount",
+	[133] = "VpInvEptAllContextEmulationTime",
+	[134] = "VpInvEptSingleContextEmulationCount",
+	[135] = "VpInvEptSingleContextEmulationTime",
+	[136] = "VpInvVpidAllContextEmulationCount",
+	[137] = "VpInvVpidAllContextEmulationTime",
+	[138] = "VpInvVpidSingleContextEmulationCount",
+	[139] = "VpInvVpidSingleContextEmulationTime",
+	[140] = "VpInvVpidSingleAddressEmulationCount",
+	[141] = "VpInvVpidSingleAddressEmulationTime",
+	[142] = "VpNestedTlbPageTableReclamations",
+	[143] = "VpNestedTlbPageTableEvictions",
+	[144] = "VpFlushGuestPhysicalAddressSpaceHypercalls",
+	[145] = "VpFlushGuestPhysicalAddressListHypercalls",
+	[146] = "VpPostedInterruptNotifications",
+	[147] = "VpPostedInterruptScans",
+	[148] = "VpTotalCoreRunTime",
+	[149] = "VpMaximumRunTime",
+	[150] = "VpHwpRequestContextSwitches",
+	[151] = "VpWaitingForCpuTimeBucket0",
+	[152] = "VpWaitingForCpuTimeBucket1",
+	[153] = "VpWaitingForCpuTimeBucket2",
+	[154] = "VpWaitingForCpuTimeBucket3",
+	[155] = "VpWaitingForCpuTimeBucket4",
+	[156] = "VpWaitingForCpuTimeBucket5",
+	[157] = "VpWaitingForCpuTimeBucket6",
+	[158] = "VpVmloadEmulationCount",
+	[159] = "VpVmloadEmulationTime",
+	[160] = "VpVmsaveEmulationCount",
+	[161] = "VpVmsaveEmulationTime",
+	[162] = "VpGifInstructionEmulationCount",
+	[163] = "VpGifInstructionEmulationTime",
+	[164] = "VpEmulatedErrataSvmInstructions",
+	[165] = "VpPlaceholder1",
+	[166] = "VpPlaceholder2",
+	[167] = "VpPlaceholder3",
+	[168] = "VpPlaceholder4",
+	[169] = "VpPlaceholder5",
+	[170] = "VpPlaceholder6",
+	[171] = "VpPlaceholder7",
+	[172] = "VpPlaceholder8",
+	[173] = "VpContentionTime",
+	[174] = "VpWakeUpTime",
+	[175] = "VpSchedulingPriority",
+	[176] = "VpRdpmcInstructionsCount",
+	[177] = "VpRdpmcInstructionsTime",
+	[178] = "VpPerfmonPmuMsrAccessesCount",
+	[179] = "VpPerfmonLbrMsrAccessesCount",
+	[180] = "VpPerfmonIptMsrAccessesCount",
+	[181] = "VpPerfmonInterruptCount",
+	[182] = "VpVtl1DispatchCount",
+	[183] = "VpVtl2DispatchCount",
+	[184] = "VpVtl2DispatchBucket0",
+	[185] = "VpVtl2DispatchBucket1",
+	[186] = "VpVtl2DispatchBucket2",
+	[187] = "VpVtl2DispatchBucket3",
+	[188] = "VpVtl2DispatchBucket4",
+	[189] = "VpVtl2DispatchBucket5",
+	[190] = "VpVtl2DispatchBucket6",
+	[191] = "VpVtl1RunTime",
+	[192] = "VpVtl2RunTime",
+	[193] = "VpIommuHypercalls",
+	[194] = "VpCpuGroupHypercalls",
+	[195] = "VpVsmHypercalls",
+	[196] = "VpEventLogHypercalls",
+	[197] = "VpDeviceDomainHypercalls",
+	[198] = "VpDepositHypercalls",
+	[199] = "VpSvmHypercalls",
+	[200] = "VpBusLockAcquisitionCount",
+	[201] = "VpLoadAvg",
+	[202] = "VpRootDispatchThreadBlocked",
+	[203] = "VpIdleCpuTime",
+	[204] = "VpWaitingForCpuTimeBucket7",
+	[205] = "VpWaitingForCpuTimeBucket8",
+	[206] = "VpWaitingForCpuTimeBucket9",
+	[207] = "VpWaitingForCpuTimeBucket10",
+	[208] = "VpWaitingForCpuTimeBucket11",
+	[209] = "VpWaitingForCpuTimeBucket12",
+	[210] = "VpHierarchicalSuspendTime",
+	[211] = "VpExpressSchedulingAttempts",
+	[212] = "VpExpressSchedulingCount",
+#elif IS_ENABLED(CONFIG_ARM64)
+	[9] = "VpSysRegAccessesCount",
+	[10] = "VpSysRegAccessesTime",
+	[11] = "VpSmcInstructionsCount",
+	[12] = "VpSmcInstructionsTime",
+	[13] = "VpOtherInterceptsCount",
+	[14] = "VpOtherInterceptsTime",
+	[15] = "VpExternalInterruptsCount",
+	[16] = "VpExternalInterruptsTime",
+	[17] = "VpPendingInterruptsCount",
+	[18] = "VpPendingInterruptsTime",
+	[19] = "VpGuestPageTableMaps",
+	[20] = "VpLargePageTlbFills",
+	[21] = "VpSmallPageTlbFills",
+	[22] = "VpReflectedGuestPageFaults",
+	[23] = "VpMemoryInterceptMessages",
+	[24] = "VpOtherMessages",
+	[25] = "VpLogicalProcessorMigrations",
+	[26] = "VpAddressDomainFlushes",
+	[27] = "VpAddressSpaceFlushes",
+	[28] = "VpSyntheticInterrupts",
+	[29] = "VpVirtualInterrupts",
+	[30] = "VpApicSelfIpisSent",
+	[31] = "VpGpaSpaceHypercalls",
+	[32] = "VpLogicalProcessorHypercalls",
+	[33] = "VpLongSpinWaitHypercalls",
+	[34] = "VpOtherHypercalls",
+	[35] = "VpSyntheticInterruptHypercalls",
+	[36] = "VpVirtualInterruptHypercalls",
+	[37] = "VpVirtualMmuHypercalls",
+	[38] = "VpVirtualProcessorHypercalls",
+	[39] = "VpHardwareInterrupts",
+	[40] = "VpNestedPageFaultInterceptsCount",
+	[41] = "VpNestedPageFaultInterceptsTime",
+	[42] = "VpLogicalProcessorDispatches",
+	[43] = "VpWaitingForCpuTime",
+	[44] = "VpExtendedHypercalls",
+	[45] = "VpExtendedHypercallInterceptMessages",
+	[46] = "VpMbecNestedPageTableSwitches",
+	[47] = "VpOtherReflectedGuestExceptions",
+	[48] = "VpGlobalIoTlbFlushes",
+	[49] = "VpGlobalIoTlbFlushCost",
+	[50] = "VpLocalIoTlbFlushes",
+	[51] = "VpLocalIoTlbFlushCost",
+	[52] = "VpFlushGuestPhysicalAddressSpaceHypercalls",
+	[53] = "VpFlushGuestPhysicalAddressListHypercalls",
+	[54] = "VpPostedInterruptNotifications",
+	[55] = "VpPostedInterruptScans",
+	[56] = "VpTotalCoreRunTime",
+	[57] = "VpMaximumRunTime",
+	[58] = "VpWaitingForCpuTimeBucket0",
+	[59] = "VpWaitingForCpuTimeBucket1",
+	[60] = "VpWaitingForCpuTimeBucket2",
+	[61] = "VpWaitingForCpuTimeBucket3",
+	[62] = "VpWaitingForCpuTimeBucket4",
+	[63] = "VpWaitingForCpuTimeBucket5",
+	[64] = "VpWaitingForCpuTimeBucket6",
+	[65] = "VpHwpRequestContextSwitches",
+	[66] = "VpPlaceholder2",
+	[67] = "VpPlaceholder3",
+	[68] = "VpPlaceholder4",
+	[69] = "VpPlaceholder5",
+	[70] = "VpPlaceholder6",
+	[71] = "VpPlaceholder7",
+	[72] = "VpPlaceholder8",
+	[73] = "VpContentionTime",
+	[74] = "VpWakeUpTime",
+	[75] = "VpSchedulingPriority",
+	[76] = "VpVtl1DispatchCount",
+	[77] = "VpVtl2DispatchCount",
+	[78] = "VpVtl2DispatchBucket0",
+	[79] = "VpVtl2DispatchBucket1",
+	[80] = "VpVtl2DispatchBucket2",
+	[81] = "VpVtl2DispatchBucket3",
+	[82] = "VpVtl2DispatchBucket4",
+	[83] = "VpVtl2DispatchBucket5",
+	[84] = "VpVtl2DispatchBucket6",
+	[85] = "VpVtl1RunTime",
+	[86] = "VpVtl2RunTime",
+	[87] = "VpIommuHypercalls",
+	[88] = "VpCpuGroupHypercalls",
+	[89] = "VpVsmHypercalls",
+	[90] = "VpEventLogHypercalls",
+	[91] = "VpDeviceDomainHypercalls",
+	[92] = "VpDepositHypercalls",
+	[93] = "VpSvmHypercalls",
+	[94] = "VpLoadAvg",
+	[95] = "VpRootDispatchThreadBlocked",
+	[96] = "VpIdleCpuTime",
+	[97] = "VpWaitingForCpuTimeBucket7",
+	[98] = "VpWaitingForCpuTimeBucket8",
+	[99] = "VpWaitingForCpuTimeBucket9",
+	[100] = "VpWaitingForCpuTimeBucket10",
+	[101] = "VpWaitingForCpuTimeBucket11",
+	[102] = "VpWaitingForCpuTimeBucket12",
+	[103] = "VpHierarchicalSuspendTime",
+	[104] = "VpExpressSchedulingAttempts",
+	[105] = "VpExpressSchedulingCount",
+#endif
+};

drivers/hv/mshv_eventfd.c

···
 
 	idx = srcu_read_lock(&partition->pt_irq_srcu);
 
-	hlist_for_each_entry_rcu(irqfd, &resampler->rsmplr_irqfd_list,
-				 irqfd_resampler_hnode) {
+	hlist_for_each_entry_srcu(irqfd, &resampler->rsmplr_irqfd_list,
+				 irqfd_resampler_hnode,
+				 srcu_read_lock_held(&partition->pt_irq_srcu)) {
 		if (hv_should_clear_interrupt(irqfd->irqfd_lapic_irq.lapic_control.interrupt_type))
 			hv_call_clear_virtual_interrupt(partition->pt_id);
 
···
 
 	new_iv.vector[new_iv.vector_count++] = vector;
 
-	if (cmpxchg(&vp->vp_register_page->interrupt_vectors.as_uint64,
-		    iv.as_uint64, new_iv.as_uint64) != iv.as_uint64)
+	if (!try_cmpxchg(&vp->vp_register_page->interrupt_vectors.as_uint64,
+			 &iv.as_uint64, new_iv.as_uint64))
 		return -EAGAIN;
 
 	return 0;
···
 {
 	struct mshv_irqfd *irqfd =
 			container_of(work, struct mshv_irqfd, irqfd_shutdown);
+	u64 cnt;
 
 	/*
 	 * Synchronize with the wait-queue and unhook ourselves to prevent
 	 * further events.
 	 */
-	remove_wait_queue(irqfd->irqfd_wqh, &irqfd->irqfd_wait);
+	eventfd_ctx_remove_wait_queue(irqfd->irqfd_eventfd_ctx, &irqfd->irqfd_wait, &cnt);
 
 	if (irqfd->irqfd_resampler) {
 		mshv_irqfd_resampler_shutdown(irqfd);
···
 {
 	struct mshv_irqfd *irqfd = container_of(wait, struct mshv_irqfd,
 						irqfd_wait);
-	unsigned long flags = (unsigned long)key;
+	__poll_t flags = key_to_poll(key);
 	int idx;
 	unsigned int seq;
 	struct mshv_partition *pt = irqfd->irqfd_partn;
 	int ret = 0;
 
-	if (flags & POLLIN) {
+	if (flags & EPOLLIN) {
 		u64 cnt;
 
 		eventfd_ctx_do_read(irqfd->irqfd_eventfd_ctx, &cnt);
···
 		ret = 1;
 	}
 
-	if (flags & POLLHUP) {
+	if (flags & EPOLLHUP) {
 		/* The eventfd is closing, detach from the partition */
 		unsigned long flags;
 
···
 {
 	struct mshv_irqfd *irqfd =
 			container_of(polltbl, struct mshv_irqfd, irqfd_polltbl);
-
-	irqfd->irqfd_wqh = wqh;
 
 	/*
 	 * TODO: Ensure there isn't already an exclusive, priority waiter, e.g.
···
 	 */
 	events = vfs_poll(fd_file(f), &irqfd->irqfd_polltbl);
 
-	if (events & POLLIN)
+	if (events & EPOLLIN)
 		mshv_assert_irq_slow(irqfd);
 
 	srcu_read_unlock(&pt->pt_irq_srcu, idx);

drivers/hv/mshv_eventfd.h

···
 	struct mshv_lapic_irq		     irqfd_lapic_irq;
 	struct hlist_node		     irqfd_hnode;
 	poll_table			     irqfd_polltbl;
-	wait_queue_head_t		    *irqfd_wqh;
 	wait_queue_entry_t		     irqfd_wait;
 	struct work_struct		     irqfd_shutdown;
 	struct mshv_irqfd_resampler	    *irqfd_resampler;

drivers/hv/mshv_regions.c

···
 	struct page *page;
 	int stride, ret;
 
-	page = region->pages[page_offset];
+	page = region->mreg_pages[page_offset];
 	if (!page)
 		return -EINVAL;
 
···
 
 	/* Start at stride since the first stride is validated */
 	for (count = stride; count < page_count; count += stride) {
-		page = region->pages[page_offset + count];
+		page = region->mreg_pages[page_offset + count];
 
 		/* Break if current page is not present */
 		if (!page)
···
 
 	while (page_count) {
 		/* Skip non-present pages */
-		if (!region->pages[page_offset]) {
+		if (!region->mreg_pages[page_offset]) {
 			page_offset++;
 			page_count--;
 			continue;
···
 	if (flags & BIT(MSHV_SET_MEM_BIT_EXECUTABLE))
 		region->hv_map_flags |= HV_MAP_GPA_EXECUTABLE;
 
-	kref_init(&region->refcount);
+	kref_init(&region->mreg_refcount);
 
 	return region;
 }
···
 		flags |= HV_MODIFY_SPA_PAGE_HOST_ACCESS_LARGE_PAGE;
 
 	return hv_call_modify_spa_host_access(region->partition->pt_id,
-					      region->pages + page_offset,
+					      region->mreg_pages + page_offset,
 					      page_count,
 					      HV_MAP_GPA_READABLE |
 					      HV_MAP_GPA_WRITABLE,
···
 		flags |= HV_MODIFY_SPA_PAGE_HOST_ACCESS_LARGE_PAGE;
 
 	return hv_call_modify_spa_host_access(region->partition->pt_id,
-					      region->pages + page_offset,
+					      region->mreg_pages + page_offset,
 					      page_count, 0,
 					      flags, false);
 }
···
 	return hv_call_map_gpa_pages(region->partition->pt_id,
 				     region->start_gfn + page_offset,
 				     page_count, flags,
-				     region->pages + page_offset);
+				     region->mreg_pages + page_offset);
 }
 
 static int mshv_region_remap_pages(struct mshv_mem_region *region,
···
 static void mshv_region_invalidate_pages(struct mshv_mem_region *region,
 					 u64 page_offset, u64 page_count)
 {
-	if (region->type == MSHV_REGION_TYPE_MEM_PINNED)
-		unpin_user_pages(region->pages + page_offset, page_count);
+	if (region->mreg_type == MSHV_REGION_TYPE_MEM_PINNED)
+		unpin_user_pages(region->mreg_pages + page_offset, page_count);
 
-	memset(region->pages + page_offset, 0,
+	memset(region->mreg_pages + page_offset, 0,
 	       page_count * sizeof(struct page *));
 }
 
···
 	int ret;
 
 	for (done_count = 0; done_count < region->nr_pages; done_count += ret) {
-		pages = region->pages + done_count;
+		pages = region->mreg_pages + done_count;
 		userspace_addr = region->start_uaddr +
 				 done_count * HV_HYP_PAGE_SIZE;
 		nr_pages = min(region->nr_pages - done_count,
···
 static void mshv_region_destroy(struct kref *ref)
 {
 	struct mshv_mem_region *region =
-		container_of(ref, struct mshv_mem_region, refcount);
+		container_of(ref, struct mshv_mem_region, mreg_refcount);
 	struct mshv_partition *partition = region->partition;
 	int ret;
 
-	if (region->type == MSHV_REGION_TYPE_MEM_MOVABLE)
+	if (region->mreg_type == MSHV_REGION_TYPE_MEM_MOVABLE)
 		mshv_region_movable_fini(region);
 
 	if (mshv_partition_encrypted(partition)) {
···
 
 void mshv_region_put(struct mshv_mem_region *region)
 {
-	kref_put(&region->refcount, mshv_region_destroy);
+	kref_put(&region->mreg_refcount, mshv_region_destroy);
 }
 
 int mshv_region_get(struct mshv_mem_region *region)
 {
-	return kref_get_unless_zero(&region->refcount);
+	return kref_get_unless_zero(&region->mreg_refcount);
 }
 
 /**
···
 	int ret;
 
 	range->notifier_seq = mmu_interval_read_begin(range->notifier);
-	mmap_read_lock(region->mni.mm);
+	mmap_read_lock(region->mreg_mni.mm);
 	ret = hmm_range_fault(range);
-	mmap_read_unlock(region->mni.mm);
+	mmap_read_unlock(region->mreg_mni.mm);
 	if (ret)
 		return ret;
 
-	mutex_lock(&region->mutex);
+	mutex_lock(&region->mreg_mutex);
 
 	if (mmu_interval_read_retry(range->notifier, range->notifier_seq)) {
-		mutex_unlock(&region->mutex);
+		mutex_unlock(&region->mreg_mutex);
 		cond_resched();
 		return -EBUSY;
 	}
···
 				   u64 page_offset, u64 page_count)
 {
 	struct hmm_range range = {
-		.notifier = &region->mni,
+		.notifier = &region->mreg_mni,
 		.default_flags = HMM_PFN_REQ_FAULT | HMM_PFN_REQ_WRITE,
 	};
 	unsigned long *pfns;
···
 		goto out;
 
 	for (i = 0; i < page_count; i++)
-		region->pages[page_offset + i] = hmm_pfn_to_page(pfns[i]);
+		region->mreg_pages[page_offset + i] = hmm_pfn_to_page(pfns[i]);
 
 	ret = mshv_region_remap_pages(region, region->hv_map_flags,
 				      page_offset, page_count);
 
-	mutex_unlock(&region->mutex);
+	mutex_unlock(&region->mreg_mutex);
 out:
 	kfree(pfns);
 	return ret;
···
 {
 	struct mshv_mem_region *region = container_of(mni,
 						      struct mshv_mem_region,
-						      mni);
+						      mreg_mni);
 	u64 page_offset, page_count;
 	unsigned long mstart, mend;
 	int ret = -EPERM;
···
 	page_count = HVPFN_DOWN(mend - mstart);
 
 	if (mmu_notifier_range_blockable(range))
-		mutex_lock(&region->mutex);
-	else if (!mutex_trylock(&region->mutex))
+		mutex_lock(&region->mreg_mutex);
+	else if (!mutex_trylock(&region->mreg_mutex))
 		goto out_fail;
 
 	mmu_interval_set_seq(mni, cur_seq);
···
 
 	mshv_region_invalidate_pages(region, page_offset, page_count);
 
-	mutex_unlock(&region->mutex);
+	mutex_unlock(&region->mreg_mutex);
 
 	return true;
 
 out_unlock:
-	mutex_unlock(&region->mutex);
+	mutex_unlock(&region->mreg_mutex);
 out_fail:
 	WARN_ONCE(ret,
 		  "Failed to invalidate region %#llx-%#llx (range %#lx-%#lx, event: %u, pages %#llx-%#llx, mm: %#llx): %d\n",
···
 
 void mshv_region_movable_fini(struct mshv_mem_region *region)
 {
-	mmu_interval_notifier_remove(&region->mni);
+	mmu_interval_notifier_remove(&region->mreg_mni);
 }
 
 bool mshv_region_movable_init(struct mshv_mem_region *region)
 {
 	int ret;
 
-	ret = mmu_interval_notifier_insert(&region->mni, current->mm,
+	ret = mmu_interval_notifier_insert(&region->mreg_mni, current->mm,
 					   region->start_uaddr,
 					   region->nr_pages << HV_HYP_PAGE_SHIFT,
 					   &mshv_region_mni_ops);
 	if (ret)
 		return false;
 
-	mutex_init(&region->mutex);
+	mutex_init(&region->mreg_mutex);
 
 	return true;
 }

drivers/hv/mshv_root.h

···
 		unsigned int kicked_by_hv;
 		wait_queue_head_t vp_suspend_queue;
 	} run;
+#if IS_ENABLED(CONFIG_DEBUG_FS)
+	struct dentry *vp_stats_dentry;
+#endif
 };
 
 #define vp_fmt(fmt) "p%lluvp%u: " fmt
···
 
 struct mshv_mem_region {
 	struct hlist_node hnode;
-	struct kref refcount;
+	struct kref mreg_refcount;
 	u64 nr_pages;
 	u64 start_gfn;
 	u64 start_uaddr;
 	u32 hv_map_flags;
 	struct mshv_partition *partition;
-	enum mshv_region_type type;
-	struct mmu_interval_notifier mni;
-	struct mutex mutex;	/* protects region pages remapping */
-	struct page *pages[];
+	enum mshv_region_type mreg_type;
+	struct mmu_interval_notifier mreg_mni;
+	struct mutex mreg_mutex;	/* protects region pages remapping */
+	struct page *mreg_pages[];
 };
 
 struct mshv_irq_ack_notifier {
···
 	u64 isolation_type;
 	bool import_completed;
 	bool pt_initialized;
+#if IS_ENABLED(CONFIG_DEBUG_FS)
+	struct dentry *pt_stats_dentry;
+	struct dentry *pt_vp_dentry;
+#endif
 };
 
 #define pt_fmt(fmt) "p%llu: " fmt
···
 void mshv_partition_put(struct mshv_partition *partition);
 struct mshv_partition *mshv_partition_find(u64 partition_id) __must_hold(RCU);
 
+static inline bool is_l1vh_parent(u64 partition_id)
+{
+	return hv_l1vh_partition() && (partition_id == HV_PARTITION_ID_SELF);
+}
+
+int mshv_vp_stats_map(u64 partition_id, u32 vp_index,
+		      struct hv_stats_page **stats_pages);
+void mshv_vp_stats_unmap(u64 partition_id, u32 vp_index,
+			 struct hv_stats_page **stats_pages);
+
 /* hypercalls */
 
 int hv_call_withdraw_memory(u64 count, int node, u64 partition_id);
···
 int hv_call_notify_port_ring_empty(u32 sint_index);
 int hv_map_stats_page(enum hv_stats_object_type type,
 		      const union hv_stats_object_identity *identity,
-		      void **addr);
-int hv_unmap_stats_page(enum hv_stats_object_type type, void *page_addr,
+		      struct hv_stats_page **addr);
+int hv_unmap_stats_page(enum hv_stats_object_type type,
+			struct hv_stats_page *page_addr,
 			const union hv_stats_object_identity *identity);
 int hv_call_modify_spa_host_access(u64 partition_id, struct page **pages,
 				   u64 page_struct_count, u32 host_access,
 				   u32 flags, u8 acquire);
 int hv_call_get_partition_property_ex(u64 partition_id, u64 property_code, u64 arg,
 				      void *property_value, size_t property_value_sz);
+
+#if IS_ENABLED(CONFIG_DEBUG_FS)
+int __init mshv_debugfs_init(void);
+void mshv_debugfs_exit(void);
+
+int mshv_debugfs_partition_create(struct mshv_partition *partition);
+void mshv_debugfs_partition_remove(struct mshv_partition *partition);
+int mshv_debugfs_vp_create(struct mshv_vp *vp);
+void mshv_debugfs_vp_remove(struct mshv_vp *vp);
+#else
+static inline int __init mshv_debugfs_init(void)
+{
+	return 0;
+}
+static inline void mshv_debugfs_exit(void) { }
+
+static inline int mshv_debugfs_partition_create(struct mshv_partition *partition)
+{
+	return 0;
+}
+static inline void mshv_debugfs_partition_remove(struct mshv_partition *partition) { }
+static inline int mshv_debugfs_vp_create(struct mshv_vp *vp)
+{
+	return 0;
+}
+static inline void mshv_debugfs_vp_remove(struct mshv_vp *vp) { }
+#endif
 
 extern struct mshv_root mshv_root;
 extern enum hv_scheduler_type hv_scheduler_type;

drivers/hv/mshv_root_hv_call.c

···
 		status = hv_do_hypercall(HVCALL_CREATE_PARTITION,
 					 input, output);
 
-		if (hv_result(status) != HV_STATUS_INSUFFICIENT_MEMORY) {
+		if (!hv_result_needs_memory(status)) {
 			if (hv_result_success(status))
 				*partition_id = output->partition_id;
 			local_irq_restore(irq_flags);
···
 			break;
 		}
 		local_irq_restore(irq_flags);
-		ret = hv_call_deposit_pages(NUMA_NO_NODE,
-					    hv_current_partition_id, 1);
+		ret = hv_deposit_memory(hv_current_partition_id, status);
 	} while (!ret);
 
 	return ret;
···
 		status = hv_do_fast_hypercall8(HVCALL_INITIALIZE_PARTITION,
 					       *(u64 *)&input);
 
-		if (hv_result(status) != HV_STATUS_INSUFFICIENT_MEMORY) {
+		if (!hv_result_needs_memory(status)) {
 			ret = hv_result_to_errno(status);
 			break;
 		}
-		ret = hv_call_deposit_pages(NUMA_NO_NODE, partition_id, 1);
+		ret = hv_deposit_memory(partition_id, status);
 	} while (!ret);
 
 	return ret;
···
 
 		completed = hv_repcomp(status);
 
-		if (hv_result(status) == HV_STATUS_INSUFFICIENT_MEMORY) {
+		if (hv_result_needs_memory(status)) {
 			ret = hv_call_deposit_pages(NUMA_NO_NODE, partition_id,
 						    HV_MAP_GPA_DEPOSIT_PAGES);
 			if (ret)
···
 
 		status = hv_do_hypercall(control, input, output);
 
-		if (hv_result(status) != HV_STATUS_INSUFFICIENT_MEMORY) {
+		if (!hv_result_needs_memory(status)) {
 			if (hv_result_success(status) && ret_output)
 				memcpy(ret_output, output, sizeof(*output));
 
···
 		}
 		local_irq_restore(flags);
 
-		ret = hv_call_deposit_pages(NUMA_NO_NODE,
-					    partition_id, 1);
+		ret = hv_deposit_memory(partition_id, status);
 	} while (!ret);
 
 	return ret;
···
 
 		status = hv_do_hypercall(control, input, NULL);
 
-		if (hv_result(status) != HV_STATUS_INSUFFICIENT_MEMORY) {
+		if (!hv_result_needs_memory(status)) {
 			local_irq_restore(flags);
 			ret = hv_result_to_errno(status);
 			break;
 		}
 		local_irq_restore(flags);
 
-		ret = hv_call_deposit_pages(NUMA_NO_NODE,
-					    partition_id, 1);
+		ret = hv_deposit_memory(partition_id, status);
 	} while (!ret);
 
 	return ret;
···
 		status = hv_do_hypercall(HVCALL_MAP_VP_STATE_PAGE, input,
 					 output);
 
-		if (hv_result(status) != HV_STATUS_INSUFFICIENT_MEMORY) {
+		if (!hv_result_needs_memory(status)) {
 			if (hv_result_success(status))
 				*state_page = pfn_to_page(output->map_location);
 			local_irq_restore(flags);
···
 
 		local_irq_restore(flags);
 
-		ret = hv_call_deposit_pages(NUMA_NO_NODE, partition_id, 1);
+		ret = hv_deposit_memory(partition_id, status);
 	} while (!ret);
 
 	return ret;
···
 		if (hv_result_success(status))
 			break;
 
-		if (hv_result(status) != HV_STATUS_INSUFFICIENT_MEMORY) {
+		if (!hv_result_needs_memory(status)) {
 			ret = hv_result_to_errno(status);
 			break;
 		}
-		ret = hv_call_deposit_pages(NUMA_NO_NODE, port_partition_id, 1);
-
+		ret = hv_deposit_memory(port_partition_id, status);
 	} while (!ret);
 
 	return ret;
···
 		if (hv_result_success(status))
 			break;
 
-		if (hv_result(status) != HV_STATUS_INSUFFICIENT_MEMORY) {
+		if (!hv_result_needs_memory(status)) {
 			ret = hv_result_to_errno(status);
 			break;
 		}
-		ret = hv_call_deposit_pages(NUMA_NO_NODE,
-					    connection_partition_id, 1);
+		ret = hv_deposit_memory(connection_partition_id, status);
 	} while (!ret);
 
 	return ret;
···
 	return hv_result_to_errno(status);
 }
 
+/*
+ * Equivalent of hv_call_map_stats_page() for cases when the caller provides
+ * the map location.
+ *
+ * NOTE: This is a newer hypercall that always supports SELF and PARENT stats
+ * areas, unlike hv_call_map_stats_page().
+ */
 static int hv_call_map_stats_page2(enum hv_stats_object_type type,
 				   const union hv_stats_object_identity *identity,
 				   u64 map_location)
···
 		if (!ret)
 			break;
 
-		if (hv_result(status) != HV_STATUS_INSUFFICIENT_MEMORY) {
+		if (!hv_result_needs_memory(status)) {
 			hv_status_debug(status, "\n");
 			break;
 		}
 
-		ret = hv_call_deposit_pages(NUMA_NO_NODE,
-					    hv_current_partition_id, 1);
+		ret = hv_deposit_memory(hv_current_partition_id, status);
 	} while (!ret);
 
 	return ret;
 }
 
-static int hv_call_map_stats_page(enum hv_stats_object_type type,
-				  const union hv_stats_object_identity *identity,
-				  void **addr)
+static int
+hv_stats_get_area_type(enum hv_stats_object_type type,
+		       const union hv_stats_object_identity *identity)
+{
+	switch (type) {
+	case HV_STATS_OBJECT_HYPERVISOR:
+		return identity->hv.stats_area_type;
+	case HV_STATS_OBJECT_LOGICAL_PROCESSOR:
+		return identity->lp.stats_area_type;
+	case HV_STATS_OBJECT_PARTITION:
+		return identity->partition.stats_area_type;
+	case HV_STATS_OBJECT_VP:
+		return identity->vp.stats_area_type;
+	}
+
+	return -EINVAL;
+}
+
+/*
+ * Map a stats page, where the page location is provided by the hypervisor.
+ *
+ * NOTE: The concept of separate SELF and PARENT stats areas does not exist on
+ * older hypervisor versions. All the available stats information can be found
+ * on the SELF page. When attempting to map the PARENT area on a hypervisor
+ * that doesn't support it, return "success" but with a NULL address. The
+ * caller should check for this case and instead fallback to the SELF area
+ * alone.
+ */
+static int
+hv_call_map_stats_page(enum hv_stats_object_type type,
+		       const union hv_stats_object_identity *identity,
+		       struct hv_stats_page **addr)
 {
 	unsigned long flags;
 	struct hv_input_map_stats_page *input;
···
 		pfn = output->map_location;
 
 		local_irq_restore(flags);
-		if (hv_result(status) != HV_STATUS_INSUFFICIENT_MEMORY) {
-			ret = hv_result_to_errno(status);
+
+		if (!hv_result_needs_memory(status)) {
 			if (hv_result_success(status))
 				break;
-			return ret;
+
+			if (hv_stats_get_area_type(type, identity) == HV_STATS_AREA_PARENT &&
+			    hv_result(status) == HV_STATUS_INVALID_PARAMETER) {
+				*addr = NULL;
+				return 0;
+			}
+
+			hv_status_debug(status, "\n");
+			return hv_result_to_errno(status);
 		}
 
-		ret = hv_call_deposit_pages(NUMA_NO_NODE,
-					    hv_current_partition_id, 1);
+		ret = hv_deposit_memory(hv_current_partition_id, status);
 		if (ret)
 			return ret;
 	} while (!ret);
···
 
 int hv_map_stats_page(enum hv_stats_object_type type,
 		      const union hv_stats_object_identity *identity,
-		      void **addr)
+		      struct hv_stats_page **addr)
 {
 	int ret;
 	struct page *allocated_page = NULL;
···
 	return hv_result_to_errno(status);
 }
 
-int hv_unmap_stats_page(enum hv_stats_object_type type, void *page_addr,
+int hv_unmap_stats_page(enum hv_stats_object_type type,
+			struct hv_stats_page *page_addr,
 			const union hv_stats_object_identity *identity)
 {
 	int ret;

drivers/hv/mshv_root_main.c

···
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("Microsoft Hyper-V root partition VMM interface /dev/mshv");
 
-/* TODO move this to another file when debugfs code is added */
-enum hv_stats_vp_counters {			/* HV_THREAD_COUNTER */
-#if defined(CONFIG_X86)
-	VpRootDispatchThreadBlocked			= 202,
+/* HV_THREAD_COUNTER */
+#if defined(CONFIG_X86_64)
+#define HV_VP_COUNTER_ROOT_DISPATCH_THREAD_BLOCKED 202
 #elif defined(CONFIG_ARM64)
-	VpRootDispatchThreadBlocked			= 94,
+#define HV_VP_COUNTER_ROOT_DISPATCH_THREAD_BLOCKED 95
 #endif
-	VpStatsMaxCounter
-};
-
-struct hv_stats_page {
-	union {
-		u64 vp_cntrs[VpStatsMaxCounter];		/* VP counters */
-		u8 data[HV_HYP_PAGE_SIZE];
-	};
-} __packed;
 
 struct mshv_root mshv_root;
 
···
 	HVCALL_SET_VP_REGISTERS,
 	HVCALL_TRANSLATE_VIRTUAL_ADDRESS,
 	HVCALL_CLEAR_VIRTUAL_INTERRUPT,
+	HVCALL_SCRUB_PARTITION,
 	HVCALL_REGISTER_INTERCEPT_RESULT,
 	HVCALL_ASSERT_VIRTUAL_INTERRUPT,
 	HVCALL_GET_GPA_PAGES_ACCESS_STATES,
···
 		if (hv_result_success(status))
 			break;
 
-		if (hv_result(status) != HV_STATUS_INSUFFICIENT_MEMORY)
+		if (!hv_result_needs_memory(status))
 			ret = hv_result_to_errno(status);
 		else
-			ret = hv_call_deposit_pages(NUMA_NO_NODE,
-						    pt_id, 1);
+			ret = hv_deposit_memory(pt_id, status);
 	} while (!ret);
 
 	args.status = hv_result(status);
···
 static bool mshv_vp_dispatch_thread_blocked(struct mshv_vp *vp)
 {
 	struct hv_stats_page **stats = vp->vp_stats_pages;
-	u64 *self_vp_cntrs = stats[HV_STATS_AREA_SELF]->vp_cntrs;
-	u64 *parent_vp_cntrs = stats[HV_STATS_AREA_PARENT]->vp_cntrs;
+	u64 *self_vp_cntrs = stats[HV_STATS_AREA_SELF]->data;
+	u64 *parent_vp_cntrs = stats[HV_STATS_AREA_PARENT]->data;
 
-	if (self_vp_cntrs[VpRootDispatchThreadBlocked])
-		return self_vp_cntrs[VpRootDispatchThreadBlocked];
-	return parent_vp_cntrs[VpRootDispatchThreadBlocked];
+	return parent_vp_cntrs[HV_VP_COUNTER_ROOT_DISPATCH_THREAD_BLOCKED] ||
+	       self_vp_cntrs[HV_VP_COUNTER_ROOT_DISPATCH_THREAD_BLOCKED];
 }
 
 static int
···
 		return false;
 
 	/* Only movable memory ranges are supported for GPA intercepts */
-	if (region->type == MSHV_REGION_TYPE_MEM_MOVABLE)
+	if (region->mreg_type == MSHV_REGION_TYPE_MEM_MOVABLE)
 		ret = mshv_region_handle_gfn_fault(region, gfn);
 	else
 		ret = false;
···
 	return 0;
 }
 
-static void mshv_vp_stats_unmap(u64 partition_id, u32 vp_index,
-				void *stats_pages[])
+void mshv_vp_stats_unmap(u64 partition_id, u32 vp_index,
+			 struct hv_stats_page *stats_pages[])
 {
 	union hv_stats_object_identity identity = {
 		.vp.partition_id = partition_id,
 		.vp.vp_index = vp_index,
 	};
+	int err;
 
 	identity.vp.stats_area_type = HV_STATS_AREA_SELF;
-	hv_unmap_stats_page(HV_STATS_OBJECT_VP, NULL, &identity);
+	err = hv_unmap_stats_page(HV_STATS_OBJECT_VP,
+				  stats_pages[HV_STATS_AREA_SELF],
+				  &identity);
+	if (err)
+		pr_err("%s: failed to unmap partition %llu vp %u self stats, err: %d\n",
+		       __func__, partition_id, vp_index, err);
 
-	identity.vp.stats_area_type = HV_STATS_AREA_PARENT;
-	hv_unmap_stats_page(HV_STATS_OBJECT_VP, NULL, &identity);
+	if (stats_pages[HV_STATS_AREA_PARENT] != stats_pages[HV_STATS_AREA_SELF]) {
+		identity.vp.stats_area_type = HV_STATS_AREA_PARENT;
+		err = hv_unmap_stats_page(HV_STATS_OBJECT_VP,
+					  stats_pages[HV_STATS_AREA_PARENT],
+					  &identity);
+		if (err)
+			pr_err("%s: failed to unmap partition %llu vp %u parent stats, err: %d\n",
+			       __func__, partition_id, vp_index, err);
+	}
 }
 
-static int mshv_vp_stats_map(u64 partition_id, u32 vp_index,
-			     void *stats_pages[])
+int mshv_vp_stats_map(u64 partition_id, u32 vp_index,
+		      struct hv_stats_page *stats_pages[])
 {
 	union hv_stats_object_identity identity = {
 		.vp.partition_id = partition_id,
···
 	identity.vp.stats_area_type = HV_STATS_AREA_SELF;
 	err = hv_map_stats_page(HV_STATS_OBJECT_VP, &identity,
 				&stats_pages[HV_STATS_AREA_SELF]);
-	if (err)
+	if (err) {
+		pr_err("%s: failed to map partition %llu vp %u self stats, err: %d\n",
+		       __func__, partition_id, vp_index, err);
 		return err;
+	}
 
-	identity.vp.stats_area_type = HV_STATS_AREA_PARENT;
-	err = hv_map_stats_page(HV_STATS_OBJECT_VP, &identity,
-				&stats_pages[HV_STATS_AREA_PARENT]);
-	if (err)
-		goto unmap_self;
+	/*
+	 * L1VH partition cannot access its vp stats in parent area.
+	 */
+	if (is_l1vh_parent(partition_id)) {
+		stats_pages[HV_STATS_AREA_PARENT] = stats_pages[HV_STATS_AREA_SELF];
+	} else {
+		identity.vp.stats_area_type = HV_STATS_AREA_PARENT;
+		err = hv_map_stats_page(HV_STATS_OBJECT_VP, &identity,
+					&stats_pages[HV_STATS_AREA_PARENT]);
+		if (err) {
+			pr_err("%s: failed to map partition %llu vp %u parent stats, err: %d\n",
+			       __func__, partition_id, vp_index, err);
+			goto unmap_self;
+		}
+		if (!stats_pages[HV_STATS_AREA_PARENT])
+			stats_pages[HV_STATS_AREA_PARENT] = stats_pages[HV_STATS_AREA_SELF];
+	}
 
 	return 0;
 
 unmap_self:
 	identity.vp.stats_area_type = HV_STATS_AREA_SELF;
-	hv_unmap_stats_page(HV_STATS_OBJECT_VP, NULL, &identity);
+	hv_unmap_stats_page(HV_STATS_OBJECT_VP,
+			    stats_pages[HV_STATS_AREA_SELF],
+			    &identity);
 	return err;
 }
 
···
 	struct mshv_create_vp args;
 	struct mshv_vp *vp;
 	struct page *intercept_msg_page, *register_page, *ghcb_page;
-	void *stats_pages[2];
+	struct hv_stats_page *stats_pages[2];
 	long ret;
 
 	if (copy_from_user(&args, arg, sizeof(args)))
···
 			goto unmap_register_page;
 	}
 
-	/*
-	 * This mapping of the stats page is for detecting if dispatch thread
-	 * is blocked - only relevant for root scheduler
-	 */
-	if (hv_scheduler_type == HV_SCHEDULER_TYPE_ROOT) {
-		ret = mshv_vp_stats_map(partition->pt_id, args.vp_index,
-					stats_pages);
-		if (ret)
-			goto unmap_ghcb_page;
-	}
+	ret = mshv_vp_stats_map(partition->pt_id, args.vp_index,
+				stats_pages);
+	if (ret)
+		goto unmap_ghcb_page;
 
 	vp = kzalloc(sizeof(*vp), GFP_KERNEL);
 	if (!vp)
···
 	if (mshv_partition_encrypted(partition) && is_ghcb_mapping_available())
 		vp->vp_ghcb_page = page_to_virt(ghcb_page);
 
-	if (hv_scheduler_type == HV_SCHEDULER_TYPE_ROOT)
-		memcpy(vp->vp_stats_pages, stats_pages, sizeof(stats_pages));
+	memcpy(vp->vp_stats_pages, stats_pages, sizeof(stats_pages));
+
+	ret = mshv_debugfs_vp_create(vp);
+	if (ret)
+		goto put_partition;
 
 	/*
 	 * Keep anon_inode_getfd last: it installs fd in the file struct and
···
 	ret = anon_inode_getfd("mshv_vp", &mshv_vp_fops, vp,
 			       O_RDWR | O_CLOEXEC);
 	if (ret < 0)
-		goto put_partition;
+		goto remove_debugfs_vp;
 
 	/* already exclusive with the partition mutex for all ioctls */
 	partition->pt_vp_count++;
···
 
 	return ret;
 
+remove_debugfs_vp:
+	mshv_debugfs_vp_remove(vp);
 put_partition:
 	mshv_partition_put(partition);
 free_vp:
 	kfree(vp);
 unmap_stats_pages:
-	if (hv_scheduler_type == HV_SCHEDULER_TYPE_ROOT)
-		mshv_vp_stats_unmap(partition->pt_id, args.vp_index, stats_pages);
+	mshv_vp_stats_unmap(partition->pt_id, args.vp_index, stats_pages);
 unmap_ghcb_page:
 	if (mshv_partition_encrypted(partition) && is_ghcb_mapping_available())
 		hv_unmap_vp_state_page(partition->pt_id, args.vp_index,
···
 		return PTR_ERR(rg);
 
 	if (is_mmio)
-		rg->type = MSHV_REGION_TYPE_MMIO;
+		rg->mreg_type = MSHV_REGION_TYPE_MMIO;
 	else if (mshv_partition_encrypted(partition) ||
 		 !mshv_region_movable_init(rg))
-		rg->type = MSHV_REGION_TYPE_MEM_PINNED;
+		rg->mreg_type = MSHV_REGION_TYPE_MEM_PINNED;
 	else
-		rg->type = MSHV_REGION_TYPE_MEM_MOVABLE;
+		rg->mreg_type = MSHV_REGION_TYPE_MEM_MOVABLE;
 
 	rg->partition = partition;
 
···
 	if (ret)
 		return ret;
 
-	switch (region->type) {
+	switch (region->mreg_type) {
 	case MSHV_REGION_TYPE_MEM_PINNED:
 		ret = mshv_prepare_pinned_region(region);
 		break;
···
 	if (ret)
 		goto withdraw_mem;
 
+	ret = mshv_debugfs_partition_create(partition);
+	if (ret)
+		goto finalize_partition;
+
 	partition->pt_initialized = true;
 
 	return 0;
 
+finalize_partition:
+	hv_call_finalize_partition(partition->pt_id);
 withdraw_mem:
 	hv_call_withdraw_memory(U64_MAX, NUMA_NO_NODE, partition->pt_id);
 
···
 			if (!vp)
 				continue;
 
-			if (hv_scheduler_type == HV_SCHEDULER_TYPE_ROOT)
-				mshv_vp_stats_unmap(partition->pt_id, vp->vp_index,
-						    (void **)vp->vp_stats_pages);
+			mshv_debugfs_vp_remove(vp);
+			mshv_vp_stats_unmap(partition->pt_id, vp->vp_index,
+					    vp->vp_stats_pages);
 
 			if (vp->vp_register_page) {
 				(void)hv_unmap_vp_state_page(partition->pt_id,
···
 
 			partition->pt_vp_array[i] = NULL;
 		}
+
+		mshv_debugfs_partition_remove(partition);
 
 		/* Deallocates and unmaps everything including vcpus, GPA mappings etc */
 		hv_call_finalize_partition(partition->pt_id);
···
 		*pt_flags |= HV_PARTITION_CREATION_FLAG_X2APIC_CAPABLE;
 	if (args.pt_flags & BIT_ULL(MSHV_PT_BIT_GPA_SUPER_PAGES))
 		*pt_flags |= HV_PARTITION_CREATION_FLAG_GPA_SUPER_PAGES_ENABLED;
+	if (args.pt_flags & BIT(MSHV_PT_BIT_NESTED_VIRTUALIZATION))
+		*pt_flags |= HV_PARTITION_CREATION_FLAG_NESTED_VIRTUALIZATION_CAPABLE;
+	if (args.pt_flags & BIT(MSHV_PT_BIT_SMT_ENABLED_GUEST))
+		*pt_flags |= HV_PARTITION_CREATION_FLAG_SMT_ENABLED_GUEST;
 
 	isol_props->as_uint64 = 0;
 
···
 	};
 }
 
+static int __init l1vh_retrieve_scheduler_type(enum hv_scheduler_type *out)
+{
+	u64 integrated_sched_enabled;
+	int ret;
+
+	*out = HV_SCHEDULER_TYPE_CORE_SMT;
+
+	if (!mshv_root.vmm_caps.vmm_enable_integrated_scheduler)
+		return 0;
+
+	ret = hv_call_get_partition_property_ex(HV_PARTITION_ID_SELF,
+						HV_PARTITION_PROPERTY_INTEGRATED_SCHEDULER_ENABLED,
+						0, &integrated_sched_enabled,
+						sizeof(integrated_sched_enabled));
+	if (ret)
+		return ret;
+
+	if (integrated_sched_enabled)
+		*out = HV_SCHEDULER_TYPE_ROOT;
+
+	return 0;
+}
+
 /* TODO move this to hv_common.c when needed outside */
 static int __init hv_retrieve_scheduler_type(enum hv_scheduler_type *out)
 {
···
 /* Retrieve and stash the supported scheduler type */
 static int __init mshv_retrieve_scheduler_type(struct device *dev)
 {
-	int ret = 0;
+	int ret;
 
 	if (hv_l1vh_partition())
-		hv_scheduler_type = HV_SCHEDULER_TYPE_CORE_SMT;
+		ret = l1vh_retrieve_scheduler_type(&hv_scheduler_type);
 	else
 		ret = hv_retrieve_scheduler_type(&hv_scheduler_type);
-
 	if (ret)
 		return ret;
 
···
 static void mshv_root_partition_exit(void)
 {
 	unregister_reboot_notifier(&mshv_reboot_nb);
-	root_scheduler_deinit();
 }
 
 static int __init mshv_root_partition_init(struct device *dev)
 {
-	int err;
-
-	err = root_scheduler_init(dev);
-	if (err)
-		return err;
-
-	err = register_reboot_notifier(&mshv_reboot_nb);
-	if (err)
-		goto root_sched_deinit;
-
-	return 0;
-
-root_sched_deinit:
-	root_scheduler_deinit();
-	return err;
+	return register_reboot_notifier(&mshv_reboot_nb);
 }
 
-static void mshv_init_vmm_caps(struct device *dev)
+static int __init mshv_init_vmm_caps(struct device *dev)
 {
-	/*
-	 * This can only fail here if HVCALL_GET_PARTITION_PROPERTY_EX or
-	 * HV_PARTITION_PROPERTY_VMM_CAPABILITIES are not supported. In that
-	 * case it's valid to proceed as if all vmm_caps are disabled (zero).
-	 */
-	if (hv_call_get_partition_property_ex(HV_PARTITION_ID_SELF,
-					      HV_PARTITION_PROPERTY_VMM_CAPABILITIES,
-					      0, &mshv_root.vmm_caps,
-					      sizeof(mshv_root.vmm_caps)))
-		dev_warn(dev, "Unable to get VMM capabilities\n");
+	int ret;
+
+	ret = hv_call_get_partition_property_ex(HV_PARTITION_ID_SELF,
+						HV_PARTITION_PROPERTY_VMM_CAPABILITIES,
+						0, &mshv_root.vmm_caps,
+						sizeof(mshv_root.vmm_caps));
+	if (ret && hv_l1vh_partition()) {
+		dev_err(dev, "Failed to get VMM capabilities: %d\n", ret);
+		return ret;
+	}
 
 	dev_dbg(dev, "vmm_caps = %#llx\n", mshv_root.vmm_caps.as_uint64[0]);
+
+	return 0;
 }
 
 static int __init mshv_parent_partition_init(void)
···
 
 	mshv_cpuhp_online = ret;
 
+	ret = mshv_init_vmm_caps(dev);
+	if (ret)
+		goto remove_cpu_state;
+
 	ret = mshv_retrieve_scheduler_type(dev);
 	if (ret)
 		goto remove_cpu_state;
···
 	if (ret)
 		goto remove_cpu_state;
 
-	mshv_init_vmm_caps(dev);
+	ret = root_scheduler_init(dev);
+	if (ret)
+		goto exit_partition;
+
+	ret = mshv_debugfs_init();
+	if (ret)
+		goto deinit_root_scheduler;
 
 	ret = mshv_irqfd_wq_init();
 	if (ret)
-		goto exit_partition;
+		goto exit_debugfs;
 
 	spin_lock_init(&mshv_root.pt_ht_lock);
 	hash_init(mshv_root.pt_htable);
···
 
 	return 0;
 
+exit_debugfs:
+	mshv_debugfs_exit();
+deinit_root_scheduler:
+	root_scheduler_deinit();
 exit_partition:
 	if (hv_root_partition())
 		mshv_root_partition_exit();
···
 {
 	hv_setup_mshv_handler(NULL);
 	mshv_port_table_fini();
+	mshv_debugfs_exit();
 	misc_deregister(&mshv_dev);
 	mshv_irqfd_wq_cleanup();
+	root_scheduler_deinit();
 	if (hv_root_partition())
 		mshv_root_partition_exit();
 	cpuhp_remove_state(mshv_cpuhp_online);

drivers/hv/mshv_vtl_main.c

···
 	.mmap = mshv_vtl_mmap,
 };
 
-static void mshv_vtl_synic_mask_vmbus_sint(const u8 *mask)
+static void mshv_vtl_synic_mask_vmbus_sint(void *info)
 {
 	union hv_synic_sint sint;
+	const u8 *mask = info;
 
 	sint.as_uint64 = 0;
 	sint.vector = HYPERVISOR_CALLBACK_VECTOR;
···
 	if (copy_from_user(&mask, arg, sizeof(mask)))
 		return -EFAULT;
 	guard(mutex)(&vtl2_vmbus_sint_mask_mutex);
-	on_each_cpu((smp_call_func_t)mshv_vtl_synic_mask_vmbus_sint, &mask.mask, 1);
+	on_each_cpu(mshv_vtl_synic_mask_vmbus_sint, &mask.mask, 1);
 	WRITE_ONCE(vtl_synic_mask_vmbus_sint_masked, mask.mask != 0);
 	if (mask.mask)
 		wake_up_interruptible_poll(&fd_wait_queue, EPOLLIN);

drivers/hv/vmbus_drv.c

···
 #include <linux/cpu.h>
 #include <linux/sched/isolation.h>
 #include <linux/sched/task_stack.h>
+#include <linux/smpboot.h>
 
 #include <linux/delay.h>
 #include <linux/panic_notifier.h>
···
 
 static int hyperv_cpuhp_online;
 
-static long __percpu *vmbus_evt;
+static DEFINE_PER_CPU(long, vmbus_evt);
 
 /* Values parsed from ACPI DSDT */
 int vmbus_irq;
···
 	}
 }
 
-void vmbus_isr(void)
+static void __vmbus_isr(void)
 {
 	struct hv_per_cpu_context *hv_cpu
 		= this_cpu_ptr(hv_context.cpu_context);
···
 	vmbus_message_sched(hv_cpu, hv_cpu->para_synic_message_page);
 
 	add_interrupt_randomness(vmbus_interrupt);
+}
+
+static DEFINE_PER_CPU(bool, vmbus_irq_pending);
+static DEFINE_PER_CPU(struct task_struct *, vmbus_irqd);
+
+static void vmbus_irqd_wake(void)
+{
+	struct task_struct *tsk = __this_cpu_read(vmbus_irqd);
+
+	__this_cpu_write(vmbus_irq_pending, true);
+	wake_up_process(tsk);
+}
+
+static void vmbus_irqd_setup(unsigned int cpu)
+{
+	sched_set_fifo(current);
+}
+
+static int vmbus_irqd_should_run(unsigned int cpu)
+{
+	return __this_cpu_read(vmbus_irq_pending);
+}
+
+static void run_vmbus_irqd(unsigned int cpu)
+{
+	__this_cpu_write(vmbus_irq_pending, false);
+	__vmbus_isr();
+}
+
+static bool vmbus_irq_initialized;
+
+static struct smp_hotplug_thread vmbus_irq_threads = {
+	.store                  = &vmbus_irqd,
+	.setup			= vmbus_irqd_setup,
+	.thread_should_run      = vmbus_irqd_should_run,
+	.thread_fn              = run_vmbus_irqd,
+	.thread_comm            = "vmbus_irq/%u",
+};
+
+void vmbus_isr(void)
+{
+	if (IS_ENABLED(CONFIG_PREEMPT_RT)) {
+		vmbus_irqd_wake();
+	} else {
+		lockdep_hardirq_threaded();
+		__vmbus_isr();
+	}
 }
 EXPORT_SYMBOL_FOR_MODULES(vmbus_isr, "mshv_vtl");
 
···
 	 * the VMbus interrupt handler.
 	 */
 
+	if (IS_ENABLED(CONFIG_PREEMPT_RT) && !vmbus_irq_initialized) {
+		ret = smpboot_register_percpu_thread(&vmbus_irq_threads);
+		if (ret)
+			goto err_kthread;
+		vmbus_irq_initialized = true;
+	}
+
 	if (vmbus_irq == -1) {
 		hv_setup_vmbus_handler(vmbus_isr);
 	} else {
-		vmbus_evt = alloc_percpu(long);
 		ret = request_percpu_irq(vmbus_irq, vmbus_percpu_isr,
-				"Hyper-V VMbus", vmbus_evt);
+				"Hyper-V VMbus", &vmbus_evt);
 		if (ret) {
 			pr_err("Can't request Hyper-V VMbus IRQ %d, Err %d",
 					vmbus_irq, ret);
-			free_percpu(vmbus_evt);
 			goto err_setup;
 		}
 	}
···
 	return 0;
 
 err_connect:
-	if (vmbus_irq == -1) {
+	if (vmbus_irq == -1)
 		hv_remove_vmbus_handler();
-	} else {
-		free_percpu_irq(vmbus_irq, vmbus_evt);
-		free_percpu(vmbus_evt);
-	}
+	else
+		free_percpu_irq(vmbus_irq, &vmbus_evt);
 err_setup:
+	if (IS_ENABLED(CONFIG_PREEMPT_RT) && vmbus_irq_initialized) {
+		smpboot_unregister_percpu_thread(&vmbus_irq_threads);
+		vmbus_irq_initialized = false;
+	}
+err_kthread:
 	bus_unregister(&hv_bus);
 	return ret;
 }
···
 	vmbus_connection.conn_state = DISCONNECTED;
 	hv_stimer_global_cleanup();
 	vmbus_disconnect();
-	if (vmbus_irq == -1) {
+	if (vmbus_irq == -1)
 		hv_remove_vmbus_handler();
-	} else {
-		free_percpu_irq(vmbus_irq, vmbus_evt);
-		free_percpu(vmbus_evt);
+	else
+		free_percpu_irq(vmbus_irq, &vmbus_evt);
+	if (IS_ENABLED(CONFIG_PREEMPT_RT) && vmbus_irq_initialized) {
+		smpboot_unregister_percpu_thread(&vmbus_irq_threads);
+		vmbus_irq_initialized = false;
 	}
 	for_each_online_cpu(cpu) {
 		struct hv_per_cpu_context *hv_cpu

drivers/pci/controller/pci-hyperv-intf.c

···
 }
 EXPORT_SYMBOL_GPL(hyperv_reg_block_invalidate);
 
-static void __exit exit_hv_pci_intf(void)
-{
-}
-
-static int __init init_hv_pci_intf(void)
-{
-	return 0;
-}
-
-module_init(init_hv_pci_intf);
-module_exit(exit_hv_pci_intf);
-
 MODULE_DESCRIPTION("Hyper-V PCI Interface");
 MODULE_LICENSE("GPL v2");

drivers/pci/controller/pci-hyperv.c

···
 	struct resource *low_mmio_res;
 	struct resource *high_mmio_res;
 	struct completion *survey_event;
-	struct pci_bus *pci_bus;
 	spinlock_t config_lock;	/* Avoid two threads writing index page */
 	spinlock_t device_list_lock;	/* Protect lists below */
 	void __iomem *cfg_addr;

include/asm-generic/mshyperv.h

···
 {
 	return hv_root_partition() || hv_l1vh_partition();
 }
+
+bool hv_result_needs_memory(u64 status);
+int hv_deposit_memory_node(int node, u64 partition_id, u64 status);
 int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages);
 int hv_call_add_logical_proc(int node, u32 lp_index, u32 acpi_id);
 int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u32 flags);
···
 static inline bool hv_root_partition(void) { return false; }
 static inline bool hv_l1vh_partition(void) { return false; }
 static inline bool hv_parent_partition(void) { return false; }
+static inline bool hv_result_needs_memory(u64 status) { return false; }
+static inline int hv_deposit_memory_node(int node, u64 partition_id, u64 status)
+{
+	return -EOPNOTSUPP;
+}
 static inline int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages)
 {
 	return -EOPNOTSUPP;
···
 	return -EOPNOTSUPP;
 }
 #endif /* CONFIG_MSHV_ROOT */
+
+static inline int hv_deposit_memory(u64 partition_id, u64 status)
+{
+	return hv_deposit_memory_node(NUMA_NO_NODE, partition_id, status);
+}
 
 #if IS_ENABLED(CONFIG_HYPERV_VTL_MODE)
 u8 __init get_vtl(void);

include/hyperv/hvgdk_mini.h

···
 } __packed;
 
 /* NOTE: when adding below, update hv_result_to_string() */
-#define HV_STATUS_SUCCESS			    0x0
-#define HV_STATUS_INVALID_HYPERCALL_CODE	    0x2
-#define HV_STATUS_INVALID_HYPERCALL_INPUT	    0x3
-#define HV_STATUS_INVALID_ALIGNMENT		    0x4
-#define HV_STATUS_INVALID_PARAMETER		    0x5
-#define HV_STATUS_ACCESS_DENIED			    0x6
-#define HV_STATUS_INVALID_PARTITION_STATE	    0x7
-#define HV_STATUS_OPERATION_DENIED		    0x8
-#define HV_STATUS_UNKNOWN_PROPERTY		    0x9
-#define HV_STATUS_PROPERTY_VALUE_OUT_OF_RANGE	    0xA
-#define HV_STATUS_INSUFFICIENT_MEMORY		    0xB
-#define HV_STATUS_INVALID_PARTITION_ID		    0xD
-#define HV_STATUS_INVALID_VP_INDEX		    0xE
-#define HV_STATUS_NOT_FOUND			    0x10
-#define HV_STATUS_INVALID_PORT_ID		    0x11
-#define HV_STATUS_INVALID_CONNECTION_ID		    0x12
-#define HV_STATUS_INSUFFICIENT_BUFFERS		    0x13
-#define HV_STATUS_NOT_ACKNOWLEDGED		    0x14
-#define HV_STATUS_INVALID_VP_STATE		    0x15
-#define HV_STATUS_NO_RESOURCES			    0x1D
-#define HV_STATUS_PROCESSOR_FEATURE_NOT_SUPPORTED   0x20
-#define HV_STATUS_INVALID_LP_INDEX		    0x41
-#define HV_STATUS_INVALID_REGISTER_VALUE	    0x50
-#define HV_STATUS_OPERATION_FAILED		    0x71
-#define HV_STATUS_TIME_OUT			    0x78
-#define HV_STATUS_CALL_PENDING			    0x79
-#define HV_STATUS_VTL_ALREADY_ENABLED		    0x86
+#define HV_STATUS_SUCCESS				0x0
+#define HV_STATUS_INVALID_HYPERCALL_CODE		0x2
+#define HV_STATUS_INVALID_HYPERCALL_INPUT		0x3
+#define HV_STATUS_INVALID_ALIGNMENT			0x4
+#define HV_STATUS_INVALID_PARAMETER			0x5
+#define HV_STATUS_ACCESS_DENIED				0x6
+#define HV_STATUS_INVALID_PARTITION_STATE		0x7
+#define HV_STATUS_OPERATION_DENIED			0x8
+#define HV_STATUS_UNKNOWN_PROPERTY			0x9
+#define HV_STATUS_PROPERTY_VALUE_OUT_OF_RANGE		0xA
+#define HV_STATUS_INSUFFICIENT_MEMORY			0xB
+#define HV_STATUS_INVALID_PARTITION_ID			0xD
+#define HV_STATUS_INVALID_VP_INDEX			0xE
+#define HV_STATUS_NOT_FOUND				0x10
+#define HV_STATUS_INVALID_PORT_ID			0x11
+#define HV_STATUS_INVALID_CONNECTION_ID			0x12
+#define HV_STATUS_INSUFFICIENT_BUFFERS			0x13
+#define HV_STATUS_NOT_ACKNOWLEDGED			0x14
+#define HV_STATUS_INVALID_VP_STATE			0x15
+#define HV_STATUS_NO_RESOURCES				0x1D
+#define HV_STATUS_PROCESSOR_FEATURE_NOT_SUPPORTED	0x20
+#define HV_STATUS_INVALID_LP_INDEX			0x41
+#define HV_STATUS_INVALID_REGISTER_VALUE		0x50
+#define HV_STATUS_OPERATION_FAILED			0x71
+#define HV_STATUS_INSUFFICIENT_ROOT_MEMORY		0x73
+#define HV_STATUS_INSUFFICIENT_CONTIGUOUS_MEMORY	0x75
+#define HV_STATUS_TIME_OUT				0x78
+#define HV_STATUS_CALL_PENDING				0x79
+#define HV_STATUS_INSUFFICIENT_CONTIGUOUS_ROOT_MEMORY	0x83
+#define HV_STATUS_VTL_ALREADY_ENABLED			0x86
 
 /*
  * The Hyper-V TimeRefCount register and the TSC
···
 #define HVCALL_NOTIFY_PARTITION_EVENT                   0x0087
 #define HVCALL_ENTER_SLEEP_STATE			0x0084
 #define HVCALL_NOTIFY_PORT_RING_EMPTY			0x008b
+#define HVCALL_SCRUB_PARTITION				0x008d
 #define HVCALL_REGISTER_INTERCEPT_RESULT		0x0091
 #define HVCALL_ASSERT_VIRTUAL_INTERRUPT			0x0094
 #define HVCALL_CREATE_PORT				0x0095

include/hyperv/hvhdk.h

···
 #include "hvhdk_mini.h"
 #include "hvgdk.h"
 
+/*
+ * Hypervisor statistics page format
+ */
+struct hv_stats_page {
+	u64 data[HV_HYP_PAGE_SIZE / sizeof(u64)];
+} __packed;
+
 /* Bits for dirty mask of hv_vp_register_page */
 #define HV_X64_REGISTER_CLASS_GENERAL	0
 #define HV_X64_REGISTER_CLASS_IP	1
···
 #define HV_PARTITION_ISOLATION_HOST_TYPE_RESERVED   0x2
 
 /* Note: Exo partition is enabled by default */
+#define HV_PARTITION_CREATION_FLAG_SMT_ENABLED_GUEST			BIT(0)
+#define HV_PARTITION_CREATION_FLAG_NESTED_VIRTUALIZATION_CAPABLE	BIT(1)
 #define HV_PARTITION_CREATION_FLAG_GPA_SUPER_PAGES_ENABLED		BIT(4)
 #define HV_PARTITION_CREATION_FLAG_EXO_PARTITION			BIT(8)
 #define HV_PARTITION_CREATION_FLAG_LAPIC_ENABLED			BIT(13)

include/hyperv/hvhdk_mini.h

···
 
 #include "hvgdk_mini.h"
 
+#define HV_MAX_CONTIGUOUS_ALLOCATION_PAGES	8
+
 /*
  * Doorbell connection_info flags.
  */
···
 	HV_PARTITION_PROPERTY_PRIVILEGE_FLAGS			= 0x00010000,
 	HV_PARTITION_PROPERTY_SYNTHETIC_PROC_FEATURES		= 0x00010001,
 
+	/* Integrated scheduling properties */
+	HV_PARTITION_PROPERTY_INTEGRATED_SCHEDULER_ENABLED	= 0x00020005,
+
 	/* Resource properties */
 	HV_PARTITION_PROPERTY_GPA_PAGE_ACCESS_TRACKING		= 0x00050005,
 	HV_PARTITION_PROPERTY_UNIMPLEMENTED_MSR_ACTION		= 0x00050017,
···
 };
 
 #define HV_PARTITION_VMM_CAPABILITIES_BANK_COUNT		1
-#define HV_PARTITION_VMM_CAPABILITIES_RESERVED_BITFIELD_COUNT	59
+#define HV_PARTITION_VMM_CAPABILITIES_RESERVED_BITFIELD_COUNT	57
 
 struct hv_partition_property_vmm_capabilities {
 	u16 bank_count;
···
 			u64 reservedbit3: 1;
 #endif
 			u64 assignable_synthetic_proc_features: 1;
+			u64 reservedbit5: 1;
+			u64 vmm_enable_integrated_scheduler : 1;
 			u64 reserved0: HV_PARTITION_VMM_CAPABILITIES_RESERVED_BITFIELD_COUNT;
 		} __packed;
 	};

include/uapi/linux/mshv.h

···
 	MSHV_PT_BIT_X2APIC,
 	MSHV_PT_BIT_GPA_SUPER_PAGES,
 	MSHV_PT_BIT_CPU_AND_XSAVE_FEATURES,
+	MSHV_PT_BIT_NESTED_VIRTUALIZATION,
+	MSHV_PT_BIT_SMT_ENABLED_GUEST,
 	MSHV_PT_BIT_COUNT,
 };