KVM: PPC: Book3s HV: Hold LPIDs in an unsigned long

The LPID register is 32 bits long. The host keeps the lpids for each
guest in an unsigned word struct kvm_arch. Currently, LPIDs are already
limited by mmu_lpid_bits and KVM_MAX_NESTED_GUESTS_SHIFT.

The nestedv2 API returns a 64 bit "Guest ID" to be used be the L1 host
for each L2 guest. This value is used as an lpid, e.g. it is the
parameter used by H_RPT_INVALIDATE. To minimize needless special casing
it makes sense to keep this "Guest ID" in struct kvm_arch::lpid.

This means that struct kvm_arch::lpid is too small so prepare for this
and make it an unsigned long. This is not a problem for the KVM-HV and
nestedv1 cases as their lpid values are already limited to valid ranges
so in those contexts the lpid can be used as an unsigned word safely as
needed.

In the PAPR, the H_RPT_INVALIDATE pid/lpid parameter is already
specified as an unsigned long so change pseries_rpt_invalidate() to
match that. Update the callers of pseries_rpt_invalidate() to also take
an unsigned long if they take an lpid value.

Signed-off-by: Jordan Niethe <[e-mail]>
Signed-off-by: Michael Ellerman <[e-mail]>
Link: https://msgid.link/[e-mail]

arch/powerpc/include/asm/kvm_book3s.h

···
 extern int kvmppc_mmu_radix_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
 			struct kvmppc_pte *gpte, bool data, bool iswrite);
 extern void kvmppc_radix_tlbie_page(struct kvm *kvm, unsigned long addr,
-				    unsigned int pshift, unsigned int lpid);
+				    unsigned int pshift, u64 lpid);
 extern void kvmppc_unmap_pte(struct kvm *kvm, pte_t *pte, unsigned long gpa,
 			unsigned int shift,
 			const struct kvm_memory_slot *memslot,
-			unsigned int lpid);
+			u64 lpid);
 extern bool kvmppc_hv_handle_set_rc(struct kvm *kvm, bool nested,
 				    bool writing, unsigned long gpa,
-				    unsigned int lpid);
+				    u64 lpid);
 extern int kvmppc_book3s_instantiate_page(struct kvm_vcpu *vcpu,
 				unsigned long gpa,
 				struct kvm_memory_slot *memslot,
···
 extern int kvmppc_init_vm_radix(struct kvm *kvm);
 extern void kvmppc_free_radix(struct kvm *kvm);
 extern void kvmppc_free_pgtable_radix(struct kvm *kvm, pgd_t *pgd,
-				      unsigned int lpid);
+				      u64 lpid);
 extern int kvmppc_radix_init(void);
 extern void kvmppc_radix_exit(void);
 extern void kvm_unmap_radix(struct kvm *kvm, struct kvm_memory_slot *memslot,
···
 void kvmhv_vm_nested_init(struct kvm *kvm);
 long kvmhv_set_partition_table(struct kvm_vcpu *vcpu);
 long kvmhv_copy_tofrom_guest_nested(struct kvm_vcpu *vcpu);
-void kvmhv_set_ptbl_entry(unsigned int lpid, u64 dw0, u64 dw1);
+void kvmhv_set_ptbl_entry(u64 lpid, u64 dw0, u64 dw1);
 void kvmhv_release_all_nested(struct kvm *kvm);
 long kvmhv_enter_nested_guest(struct kvm_vcpu *vcpu);
 long kvmhv_do_nested_tlbie(struct kvm_vcpu *vcpu);

arch/powerpc/include/asm/kvm_book3s_64.h

···
 
 extern int kvmppc_create_pte(struct kvm *kvm, pgd_t *pgtable, pte_t pte,
 			     unsigned long gpa, unsigned int level,
-			     unsigned long mmu_seq, unsigned int lpid,
+			     unsigned long mmu_seq, u64 lpid,
 			     unsigned long *rmapp, struct rmap_nested **n_rmap);
 extern void kvmhv_insert_nest_rmap(struct kvm *kvm, unsigned long *rmapp,
 				   struct rmap_nested **n_rmap);

arch/powerpc/include/asm/kvm_host.h

···
 #define KVMPPC_SECURE_INIT_ABORT 0x4 /* H_SVM_INIT_ABORT issued */
 
 struct kvm_arch {
-	unsigned int lpid;
+	u64 lpid;
 	unsigned int smt_mode;		/* # vcpus per virtual core */
 	unsigned int emul_smt_mode;	/* emualted SMT mode, on P9 */
 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE

arch/powerpc/include/asm/plpar_wrappers.h

···
  * error recovery of killing the process/guest will be eventually
  * needed.
  */
-static inline long pseries_rpt_invalidate(u32 pid, u64 target, u64 type,
+static inline long pseries_rpt_invalidate(u64 pid, u64 target, u64 type,
 					  u64 page_sizes, u64 start, u64 end)
 {
 	long rc;
···
 	return 0;
 }
 
-static inline long pseries_rpt_invalidate(u32 pid, u64 target, u64 type,
+static inline long pseries_rpt_invalidate(u64 pid, u64 target, u64 type,
 					  u64 page_sizes, u64 start, u64 end)
 {
 	return 0;

arch/powerpc/kvm/book3s_64_mmu_hv.c

···
 	kvm->arch.hpt = *info;
 	kvm->arch.sdr1 = __pa(info->virt) | (info->order - 18);
 
-	pr_debug("KVM guest htab at %lx (order %ld), LPID %x\n",
+	pr_debug("KVM guest htab at %lx (order %ld), LPID %llx\n",
 		 info->virt, (long)info->order, kvm->arch.lpid);
 }
 

arch/powerpc/kvm/book3s_64_mmu_radix.c

···
 }
 
 void kvmppc_radix_tlbie_page(struct kvm *kvm, unsigned long addr,
-			     unsigned int pshift, unsigned int lpid)
+			     unsigned int pshift, u64 lpid)
 {
 	unsigned long psize = PAGE_SIZE;
 	int psi;
···
 		pr_err("KVM: TLB page invalidation hcall failed, rc=%ld\n", rc);
 }
 
-static void kvmppc_radix_flush_pwc(struct kvm *kvm, unsigned int lpid)
+static void kvmppc_radix_flush_pwc(struct kvm *kvm, u64 lpid)
 {
 	long rc;
 
···
 void kvmppc_unmap_pte(struct kvm *kvm, pte_t *pte, unsigned long gpa,
 		      unsigned int shift,
 		      const struct kvm_memory_slot *memslot,
-		      unsigned int lpid)
+		      u64 lpid)
 
 {
 	unsigned long old;
···
  * (or 4kB) mappings (of sub-pages of the same 2MB page).
  */
 static void kvmppc_unmap_free_pte(struct kvm *kvm, pte_t *pte, bool full,
-				  unsigned int lpid)
+				  u64 lpid)
 {
 	if (full) {
 		memset(pte, 0, sizeof(long) << RADIX_PTE_INDEX_SIZE);
···
 }
 
 static void kvmppc_unmap_free_pmd(struct kvm *kvm, pmd_t *pmd, bool full,
-				  unsigned int lpid)
+				  u64 lpid)
 {
 	unsigned long im;
 	pmd_t *p = pmd;
···
 }
 
 static void kvmppc_unmap_free_pud(struct kvm *kvm, pud_t *pud,
-				  unsigned int lpid)
+				  u64 lpid)
 {
 	unsigned long iu;
 	pud_t *p = pud;
···
 	pud_free(kvm->mm, pud);
 }
 
-void kvmppc_free_pgtable_radix(struct kvm *kvm, pgd_t *pgd, unsigned int lpid)
+void kvmppc_free_pgtable_radix(struct kvm *kvm, pgd_t *pgd, u64 lpid)
 {
 	unsigned long ig;
 
···
 }
 
 static void kvmppc_unmap_free_pmd_entry_table(struct kvm *kvm, pmd_t *pmd,
-					unsigned long gpa, unsigned int lpid)
+					unsigned long gpa, u64 lpid)
 {
 	pte_t *pte = pte_offset_kernel(pmd, 0);
 
···
 }
 
 static void kvmppc_unmap_free_pud_entry_table(struct kvm *kvm, pud_t *pud,
-					unsigned long gpa, unsigned int lpid)
+					unsigned long gpa, u64 lpid)
 {
 	pmd_t *pmd = pmd_offset(pud, 0);
 
···
 
 int kvmppc_create_pte(struct kvm *kvm, pgd_t *pgtable, pte_t pte,
 		      unsigned long gpa, unsigned int level,
-		      unsigned long mmu_seq, unsigned int lpid,
+		      unsigned long mmu_seq, u64 lpid,
 		      unsigned long *rmapp, struct rmap_nested **n_rmap)
 {
 	pgd_t *pgd;
···
 }
 
 bool kvmppc_hv_handle_set_rc(struct kvm *kvm, bool nested, bool writing,
-			     unsigned long gpa, unsigned int lpid)
+			     unsigned long gpa, u64 lpid)
 {
 	unsigned long pgflags;
 	unsigned int shift;

arch/powerpc/kvm/book3s_hv_nested.c

···
 	}
 }
 
-static void kvmhv_flush_lpid(unsigned int lpid)
+static void kvmhv_flush_lpid(u64 lpid)
 {
 	long rc;
 
···
 		pr_err("KVM: TLB LPID invalidation hcall failed, rc=%ld\n", rc);
 }
 
-void kvmhv_set_ptbl_entry(unsigned int lpid, u64 dw0, u64 dw1)
+void kvmhv_set_ptbl_entry(u64 lpid, u64 dw0, u64 dw1)
 {
 	if (!kvmhv_on_pseries()) {
 		mmu_partition_table_set_entry(lpid, dw0, dw1, true);

arch/powerpc/kvm/book3s_hv_uvmem.c

···
 	}
 
 	kvm->arch.secure_guest |= KVMPPC_SECURE_INIT_DONE;
-	pr_info("LPID %d went secure\n", kvm->arch.lpid);
+	pr_info("LPID %lld went secure\n", kvm->arch.lpid);
 
 out:
 	srcu_read_unlock(&kvm->srcu, srcu_idx);

arch/powerpc/kvm/book3s_xive.c

···
 	}
 
 	if (single_escalation)
-		name = kasprintf(GFP_KERNEL, "kvm-%d-%d",
+		name = kasprintf(GFP_KERNEL, "kvm-%lld-%d",
 				 vcpu->kvm->arch.lpid, xc->server_num);
 	else
-		name = kasprintf(GFP_KERNEL, "kvm-%d-%d-%d",
+		name = kasprintf(GFP_KERNEL, "kvm-%lld-%d-%d",
 				 vcpu->kvm->arch.lpid, xc->server_num, prio);
 	if (!name) {
 		pr_err("Failed to allocate escalation irq name for queue %d of VCPU %d\n",