x86/vmware: Introduce VMware hypercall API

Introduce a vmware_hypercall family of functions. It is a common implementation
to be used by the VMware guest code and virtual device drivers in architecture
independent manner.

The API consists of vmware_hypercallX and vmware_hypercall_hb_{out,in}
set of functions analogous to KVM's hypercall API. Architecture-specific
implementation is hidden inside.

It will simplify future enhancements in VMware hypercalls such as SEV-ES and
TDX related changes without needs to modify a caller in device drivers code.

Current implementation extends an idea from

bac7b4e84323 ("x86/vmware: Update platform detection code for VMCALL/VMMCALL hypercalls")

to have a slow, but safe path vmware_hypercall_slow() earlier during the boot
when alternatives are not yet applied. The code inherits VMWARE_CMD logic from
the commit mentioned above.

Move common macros from vmware.c to vmware.h.

[ bp: Fold in a fix:
https://lore.kernel.org/r/[e-mail] ]

Signed-off-by: Alexey Makhalov <[e-mail]>
Signed-off-by: Borislav Petkov (AMD) <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

arch/x86/include/asm/vmware.h

···
 #include <linux/stringify.h>
 
 /*
- * The hypercall definitions differ in the low word of the %edx argument
- * in the following way: the old port base interface uses the port
- * number to distinguish between high- and low bandwidth versions.
+ * VMware hypercall ABI.
+ *
+ * - Low bandwidth (LB) hypercalls (I/O port based, vmcall and vmmcall)
+ * have up to 6 input and 6 output arguments passed and returned using
+ * registers: %eax (arg0), %ebx (arg1), %ecx (arg2), %edx (arg3),
+ * %esi (arg4), %edi (arg5).
+ * The following input arguments must be initialized by the caller:
+ * arg0 - VMWARE_HYPERVISOR_MAGIC
+ * arg2 - Hypercall command
+ * arg3 bits [15:0] - Port number, LB and direction flags
+ *
+ * - High bandwidth (HB) hypercalls are I/O port based only. They have
+ * up to 7 input and 7 output arguments passed and returned using
+ * registers: %eax (arg0), %ebx (arg1), %ecx (arg2), %edx (arg3),
+ * %esi (arg4), %edi (arg5), %ebp (arg6).
+ * The following input arguments must be initialized by the caller:
+ * arg0 - VMWARE_HYPERVISOR_MAGIC
+ * arg1 - Hypercall command
+ * arg3 bits [15:0] - Port number, HB and direction flags
+ *
+ * For compatibility purposes, x86_64 systems use only lower 32 bits
+ * for input and output arguments.
+ *
+ * The hypercall definitions differ in the low word of the %edx (arg3)
+ * in the following way: the old I/O port based interface uses the port
+ * number to distinguish between high- and low bandwidth versions, and
+ * uses IN/OUT instructions to define transfer direction.
  *
  * The new vmcall interface instead uses a set of flags to select
  * bandwidth mode and transfer direction. The flags should be loaded
- * into %dx by any user and are automatically replaced by the port
- * number if the VMWARE_HYPERVISOR_PORT method is used.
- *
- * In short, new driver code should strictly use the new definition of
- * %dx content.
+ * into arg3 by any user and are automatically replaced by the port
+ * number if the I/O port method is used.
  */
 
-/* Old port-based version */
-#define VMWARE_HYPERVISOR_PORT    0x5658
-#define VMWARE_HYPERVISOR_PORT_HB 0x5659
+#define VMWARE_HYPERVISOR_HB		BIT(0)
+#define VMWARE_HYPERVISOR_OUT		BIT(1)
 
-/* Current vmcall / vmmcall version */
-#define VMWARE_HYPERVISOR_HB   BIT(0)
-#define VMWARE_HYPERVISOR_OUT  BIT(1)
+#define VMWARE_HYPERVISOR_PORT		0x5658
+#define VMWARE_HYPERVISOR_PORT_HB	(VMWARE_HYPERVISOR_PORT | \
+					 VMWARE_HYPERVISOR_HB)
+
+#define VMWARE_HYPERVISOR_MAGIC		0x564d5868U
+
+#define VMWARE_CMD_GETVERSION		10
+#define VMWARE_CMD_GETHZ		45
+#define VMWARE_CMD_GETVCPU_INFO		68
+#define VMWARE_CMD_STEALCLOCK		91
+
+#define CPUID_VMWARE_FEATURES_ECX_VMMCALL	BIT(0)
+#define CPUID_VMWARE_FEATURES_ECX_VMCALL	BIT(1)
+
+extern unsigned long vmware_hypercall_slow(unsigned long cmd,
+					   unsigned long in1, unsigned long in3,
+					   unsigned long in4, unsigned long in5,
+					   u32 *out1, u32 *out2, u32 *out3,
+					   u32 *out4, u32 *out5);
+
+/*
+ * The low bandwidth call. The low word of %edx is presumed to have OUT bit
+ * set. The high word of %edx may contain input data from the caller.
+ */
+#define VMWARE_HYPERCALL					\
+	ALTERNATIVE_2("movw %[port], %%dx\n\t"			\
+		      "inl (%%dx), %%eax",			\
+		      "vmcall", X86_FEATURE_VMCALL,		\
+		      "vmmcall", X86_FEATURE_VMW_VMMCALL)
+
+static inline
+unsigned long vmware_hypercall1(unsigned long cmd, unsigned long in1)
+{
+	unsigned long out0;
+
+	if (unlikely(!alternatives_patched) && !__is_defined(MODULE))
+		return vmware_hypercall_slow(cmd, in1, 0, 0, 0,
+					     NULL, NULL, NULL, NULL, NULL);
+
+	asm_inline volatile (VMWARE_HYPERCALL
+		: "=a" (out0)
+		: [port] "i" (VMWARE_HYPERVISOR_PORT),
+		  "a" (VMWARE_HYPERVISOR_MAGIC),
+		  "b" (in1),
+		  "c" (cmd),
+		  "d" (0)
+		: "cc", "memory");
+	return out0;
+}
+
+static inline
+unsigned long vmware_hypercall3(unsigned long cmd, unsigned long in1,
+				u32 *out1, u32 *out2)
+{
+	unsigned long out0;
+
+	if (unlikely(!alternatives_patched) && !__is_defined(MODULE))
+		return vmware_hypercall_slow(cmd, in1, 0, 0, 0,
+					     out1, out2, NULL, NULL, NULL);
+
+	asm_inline volatile (VMWARE_HYPERCALL
+		: "=a" (out0), "=b" (*out1), "=c" (*out2)
+		: [port] "i" (VMWARE_HYPERVISOR_PORT),
+		  "a" (VMWARE_HYPERVISOR_MAGIC),
+		  "b" (in1),
+		  "c" (cmd),
+		  "d" (0)
+		: "cc", "memory");
+	return out0;
+}
+
+static inline
+unsigned long vmware_hypercall4(unsigned long cmd, unsigned long in1,
+				u32 *out1, u32 *out2, u32 *out3)
+{
+	unsigned long out0;
+
+	if (unlikely(!alternatives_patched) && !__is_defined(MODULE))
+		return vmware_hypercall_slow(cmd, in1, 0, 0, 0,
+					     out1, out2, out3, NULL, NULL);
+
+	asm_inline volatile (VMWARE_HYPERCALL
+		: "=a" (out0), "=b" (*out1), "=c" (*out2), "=d" (*out3)
+		: [port] "i" (VMWARE_HYPERVISOR_PORT),
+		  "a" (VMWARE_HYPERVISOR_MAGIC),
+		  "b" (in1),
+		  "c" (cmd),
+		  "d" (0)
+		: "cc", "memory");
+	return out0;
+}
+
+static inline
+unsigned long vmware_hypercall5(unsigned long cmd, unsigned long in1,
+				unsigned long in3, unsigned long in4,
+				unsigned long in5, u32 *out2)
+{
+	unsigned long out0;
+
+	if (unlikely(!alternatives_patched) && !__is_defined(MODULE))
+		return vmware_hypercall_slow(cmd, in1, in3, in4, in5,
+					     NULL, out2, NULL, NULL, NULL);
+
+	asm_inline volatile (VMWARE_HYPERCALL
+		: "=a" (out0), "=c" (*out2)
+		: [port] "i" (VMWARE_HYPERVISOR_PORT),
+		  "a" (VMWARE_HYPERVISOR_MAGIC),
+		  "b" (in1),
+		  "c" (cmd),
+		  "d" (in3),
+		  "S" (in4),
+		  "D" (in5)
+		: "cc", "memory");
+	return out0;
+}
+
+static inline
+unsigned long vmware_hypercall6(unsigned long cmd, unsigned long in1,
+				unsigned long in3, u32 *out2,
+				u32 *out3, u32 *out4, u32 *out5)
+{
+	unsigned long out0;
+
+	if (unlikely(!alternatives_patched) && !__is_defined(MODULE))
+		return vmware_hypercall_slow(cmd, in1, in3, 0, 0,
+					     NULL, out2, out3, out4, out5);
+
+	asm_inline volatile (VMWARE_HYPERCALL
+		: "=a" (out0), "=c" (*out2), "=d" (*out3), "=S" (*out4),
+		  "=D" (*out5)
+		: [port] "i" (VMWARE_HYPERVISOR_PORT),
+		  "a" (VMWARE_HYPERVISOR_MAGIC),
+		  "b" (in1),
+		  "c" (cmd),
+		  "d" (in3)
+		: "cc", "memory");
+	return out0;
+}
+
+static inline
+unsigned long vmware_hypercall7(unsigned long cmd, unsigned long in1,
+				unsigned long in3, unsigned long in4,
+				unsigned long in5, u32 *out1,
+				u32 *out2, u32 *out3)
+{
+	unsigned long out0;
+
+	if (unlikely(!alternatives_patched) && !__is_defined(MODULE))
+		return vmware_hypercall_slow(cmd, in1, in3, in4, in5,
+					     out1, out2, out3, NULL, NULL);
+
+	asm_inline volatile (VMWARE_HYPERCALL
+		: "=a" (out0), "=b" (*out1), "=c" (*out2), "=d" (*out3)
+		: [port] "i" (VMWARE_HYPERVISOR_PORT),
+		  "a" (VMWARE_HYPERVISOR_MAGIC),
+		  "b" (in1),
+		  "c" (cmd),
+		  "d" (in3),
+		  "S" (in4),
+		  "D" (in5)
+		: "cc", "memory");
+	return out0;
+}
+
+#ifdef CONFIG_X86_64
+#define VMW_BP_CONSTRAINT "r"
+#else
+#define VMW_BP_CONSTRAINT "m"
+#endif
+
+/*
+ * High bandwidth calls are not supported on encrypted memory guests.
+ * The caller should check cc_platform_has(CC_ATTR_MEM_ENCRYPT) and use
+ * low bandwidth hypercall if memory encryption is set.
+ * This assumption simplifies HB hypercall implementation to just I/O port
+ * based approach without alternative patching.
+ */
+static inline
+unsigned long vmware_hypercall_hb_out(unsigned long cmd, unsigned long in2,
+				      unsigned long in3, unsigned long in4,
+				      unsigned long in5, unsigned long in6,
+				      u32 *out1)
+{
+	unsigned long out0;
+
+	asm_inline volatile (
+		UNWIND_HINT_SAVE
+		"push %%" _ASM_BP "\n\t"
+		UNWIND_HINT_UNDEFINED
+		"mov %[in6], %%" _ASM_BP "\n\t"
+		"rep outsb\n\t"
+		"pop %%" _ASM_BP "\n\t"
+		UNWIND_HINT_RESTORE
+		: "=a" (out0), "=b" (*out1)
+		: "a" (VMWARE_HYPERVISOR_MAGIC),
+		  "b" (cmd),
+		  "c" (in2),
+		  "d" (in3 | VMWARE_HYPERVISOR_PORT_HB),
+		  "S" (in4),
+		  "D" (in5),
+		  [in6] VMW_BP_CONSTRAINT (in6)
+		: "cc", "memory");
+	return out0;
+}
+
+static inline
+unsigned long vmware_hypercall_hb_in(unsigned long cmd, unsigned long in2,
+				     unsigned long in3, unsigned long in4,
+				     unsigned long in5, unsigned long in6,
+				     u32 *out1)
+{
+	unsigned long out0;
+
+	asm_inline volatile (
+		UNWIND_HINT_SAVE
+		"push %%" _ASM_BP "\n\t"
+		UNWIND_HINT_UNDEFINED
+		"mov %[in6], %%" _ASM_BP "\n\t"
+		"rep insb\n\t"
+		"pop %%" _ASM_BP "\n\t"
+		UNWIND_HINT_RESTORE
+		: "=a" (out0), "=b" (*out1)
+		: "a" (VMWARE_HYPERVISOR_MAGIC),
+		  "b" (cmd),
+		  "c" (in2),
+		  "d" (in3 | VMWARE_HYPERVISOR_PORT_HB),
+		  "S" (in4),
+		  "D" (in5),
+		  [in6] VMW_BP_CONSTRAINT (in6)
+		: "cc", "memory");
+	return out0;
+}
+#undef VMW_BP_CONSTRAINT
+#undef VMWARE_HYPERCALL
 
 /* The low bandwidth call. The low word of edx is presumed clear. */
 #define VMWARE_HYPERCALL						\

arch/x86/kernel/cpu/vmware.c

···
 
 #define CPUID_VMWARE_INFO_LEAF               0x40000000
 #define CPUID_VMWARE_FEATURES_LEAF           0x40000010
-#define CPUID_VMWARE_FEATURES_ECX_VMMCALL    BIT(0)
-#define CPUID_VMWARE_FEATURES_ECX_VMCALL     BIT(1)
 
-#define VMWARE_HYPERVISOR_MAGIC	0x564D5868
-
-#define VMWARE_CMD_GETVERSION    10
-#define VMWARE_CMD_GETHZ         45
-#define VMWARE_CMD_GETVCPU_INFO  68
 #define VMWARE_CMD_LEGACY_X2APIC  3
 #define VMWARE_CMD_VCPU_RESERVED 31
-#define VMWARE_CMD_STEALCLOCK    91
 
 #define STEALCLOCK_NOT_AVAILABLE (-1)
 #define STEALCLOCK_DISABLED        0
···
 
 static unsigned long vmware_tsc_khz __ro_after_init;
 static u8 vmware_hypercall_mode     __ro_after_init;
+
+unsigned long vmware_hypercall_slow(unsigned long cmd,
+				    unsigned long in1, unsigned long in3,
+				    unsigned long in4, unsigned long in5,
+				    u32 *out1, u32 *out2, u32 *out3,
+				    u32 *out4, u32 *out5)
+{
+	unsigned long out0, rbx, rcx, rdx, rsi, rdi;
+
+	switch (vmware_hypercall_mode) {
+	case CPUID_VMWARE_FEATURES_ECX_VMCALL:
+		asm_inline volatile ("vmcall"
+				: "=a" (out0), "=b" (rbx), "=c" (rcx),
+				"=d" (rdx), "=S" (rsi), "=D" (rdi)
+				: "a" (VMWARE_HYPERVISOR_MAGIC),
+				"b" (in1),
+				"c" (cmd),
+				"d" (in3),
+				"S" (in4),
+				"D" (in5)
+				: "cc", "memory");
+		break;
+	case CPUID_VMWARE_FEATURES_ECX_VMMCALL:
+		asm_inline volatile ("vmmcall"
+				: "=a" (out0), "=b" (rbx), "=c" (rcx),
+				"=d" (rdx), "=S" (rsi), "=D" (rdi)
+				: "a" (VMWARE_HYPERVISOR_MAGIC),
+				"b" (in1),
+				"c" (cmd),
+				"d" (in3),
+				"S" (in4),
+				"D" (in5)
+				: "cc", "memory");
+		break;
+	default:
+		asm_inline volatile ("movw %[port], %%dx; inl (%%dx), %%eax"
+				: "=a" (out0), "=b" (rbx), "=c" (rcx),
+				"=d" (rdx), "=S" (rsi), "=D" (rdi)
+				: [port] "i" (VMWARE_HYPERVISOR_PORT),
+				"a" (VMWARE_HYPERVISOR_MAGIC),
+				"b" (in1),
+				"c" (cmd),
+				"d" (in3),
+				"S" (in4),
+				"D" (in5)
+				: "cc", "memory");
+		break;
+	}
+
+	if (out1)
+		*out1 = rbx;
+	if (out2)
+		*out2 = rcx;
+	if (out3)
+		*out3 = rdx;
+	if (out4)
+		*out4 = rsi;
+	if (out5)
+		*out5 = rdi;
+
+	return out0;
+}
 
 static inline int __vmware_platform(void)
 {