KVM: PPC: Book3S PR: Allocate kvm_vcpu structs from kvm_vcpu_cache

This makes PR KVM allocate its kvm_vcpu structs from the kvm_vcpu_cache
rather than having them embedded in the kvmppc_vcpu_book3s struct,
which is allocated with vzalloc.  The reason is to reduce the
differences between PR and HV KVM in order to make is easier to have
them coexist in one kernel binary.

With this, the kvm_vcpu struct has a pointer to the kvmppc_vcpu_book3s
struct.  The pointer to the kvmppc_book3s_shadow_vcpu struct has moved
from the kvmppc_vcpu_book3s struct to the kvm_vcpu struct, and is only
present for 32-bit, since it is only used for 32-bit.

Signed-off-by: Paul Mackerras <paulus@samba.org>
[agraf: squash in compile fix from Aneesh]
Signed-off-by: Alexander Graf <agraf@suse.de>

arch/powerpc/include/asm/kvm_book3s.h

@@ -70,8 +70,6 @@ struct hpte_cache {
 };
 
 struct kvmppc_vcpu_book3s {
-	struct kvm_vcpu vcpu;
-	struct kvmppc_book3s_shadow_vcpu *shadow_vcpu;
 	struct kvmppc_sid_map sid_map[SID_MAP_NUM];
 	struct {
 		u64 esid;
@@ -194,7 +192,7 @@ extern int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd);
 
 static inline struct kvmppc_vcpu_book3s *to_book3s(struct kvm_vcpu *vcpu)
 {
-	return container_of(vcpu, struct kvmppc_vcpu_book3s, vcpu);
+	return vcpu->arch.book3s;
 }
 
 extern void kvm_return_point(void);

arch/powerpc/include/asm/kvm_book3s_32.h

@@ -22,7 +22,7 @@
 
 static inline struct kvmppc_book3s_shadow_vcpu *svcpu_get(struct kvm_vcpu *vcpu)
 {
-	return to_book3s(vcpu)->shadow_vcpu;
+	return vcpu->arch.shadow_vcpu;
 }
 
 static inline void svcpu_put(struct kvmppc_book3s_shadow_vcpu *svcpu)

arch/powerpc/include/asm/kvm_host.h

@@ -86,6 +86,9 @@ struct lppaca;
 struct slb_shadow;
 struct dtl_entry;
 
+struct kvmppc_vcpu_book3s;
+struct kvmppc_book3s_shadow_vcpu;
+
 struct kvm_vm_stat {
 	u32 remote_tlb_flush;
 };
@@ -408,6 +411,10 @@ struct kvm_vcpu_arch {
 	int slb_max;		/* 1 + index of last valid entry in slb[] */
 	int slb_nr;		/* total number of entries in SLB */
 	struct kvmppc_mmu mmu;
+	struct kvmppc_vcpu_book3s *book3s;
+#endif
+#ifdef CONFIG_PPC_BOOK3S_32
+	struct kvmppc_book3s_shadow_vcpu *shadow_vcpu;
 #endif
 
 	ulong gpr[32];

arch/powerpc/kvm/book3s_32_mmu.c

@@ -111,10 +111,11 @@ static void kvmppc_mmu_book3s_32_reset_msr(struct kvm_vcpu *vcpu)
 	kvmppc_set_msr(vcpu, 0);
 }
 
-static hva_t kvmppc_mmu_book3s_32_get_pteg(struct kvmppc_vcpu_book3s *vcpu_book3s,
+static hva_t kvmppc_mmu_book3s_32_get_pteg(struct kvm_vcpu *vcpu,
 				      u32 sre, gva_t eaddr,
 				      bool primary)
 {
+	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
 	u32 page, hash, pteg, htabmask;
 	hva_t r;
 
@@ -132,7 +133,7 @@ static hva_t kvmppc_mmu_book3s_32_get_pteg(struct kvmppc_vcpu_book3s *vcpu_book3
 		kvmppc_get_pc(&vcpu_book3s->vcpu), eaddr, vcpu_book3s->sdr1, pteg,
 		sr_vsid(sre));
 
-	r = gfn_to_hva(vcpu_book3s->vcpu.kvm, pteg >> PAGE_SHIFT);
+	r = gfn_to_hva(vcpu->kvm, pteg >> PAGE_SHIFT);
 	if (kvm_is_error_hva(r))
 		return r;
 	return r | (pteg & ~PAGE_MASK);
@@ -203,7 +204,6 @@ static int kvmppc_mmu_book3s_32_xlate_pte(struct kvm_vcpu *vcpu, gva_t eaddr,
 				     struct kvmppc_pte *pte, bool data,
 				     bool primary)
 {
-	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
 	u32 sre;
 	hva_t ptegp;
 	u32 pteg[16];
@@ -218,7 +218,7 @@ static int kvmppc_mmu_book3s_32_xlate_pte(struct kvm_vcpu *vcpu, gva_t eaddr,
 
 	pte->vpage = kvmppc_mmu_book3s_32_ea_to_vp(vcpu, eaddr, data);
 
-	ptegp = kvmppc_mmu_book3s_32_get_pteg(vcpu_book3s, sre, eaddr, primary);
+	ptegp = kvmppc_mmu_book3s_32_get_pteg(vcpu, sre, eaddr, primary);
 	if (kvm_is_error_hva(ptegp)) {
 		printk(KERN_INFO "KVM: Invalid PTEG!\n");
 		goto no_page_found;

arch/powerpc/kvm/book3s_64_mmu.c

@@ -130,11 +130,11 @@ static u32 kvmppc_mmu_book3s_64_get_page(struct kvmppc_slb *slbe, gva_t eaddr)
 	return ((eaddr & kvmppc_slb_offset_mask(slbe)) >> p);
 }
 
-static hva_t kvmppc_mmu_book3s_64_get_pteg(
-				struct kvmppc_vcpu_book3s *vcpu_book3s,
+static hva_t kvmppc_mmu_book3s_64_get_pteg(struct kvm_vcpu *vcpu,
 				struct kvmppc_slb *slbe, gva_t eaddr,
 				bool second)
 {
+	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
 	u64 hash, pteg, htabsize;
 	u32 ssize;
 	hva_t r;
@@ -159,10 +159,10 @@ static hva_t kvmppc_mmu_book3s_64_get_pteg(
 
 	/* When running a PAPR guest, SDR1 contains a HVA address instead
            of a GPA */
-	if (vcpu_book3s->vcpu.arch.papr_enabled)
+	if (vcpu->arch.papr_enabled)
 		r = pteg;
 	else
-		r = gfn_to_hva(vcpu_book3s->vcpu.kvm, pteg >> PAGE_SHIFT);
+		r = gfn_to_hva(vcpu->kvm, pteg >> PAGE_SHIFT);
 
 	if (kvm_is_error_hva(r))
 		return r;
@@ -208,7 +208,6 @@ static int decode_pagesize(struct kvmppc_slb *slbe, u64 r)
 static int kvmppc_mmu_book3s_64_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
 				struct kvmppc_pte *gpte, bool data)
 {
-	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
 	struct kvmppc_slb *slbe;
 	hva_t ptegp;
 	u64 pteg[16];
@@ -260,7 +259,7 @@ static int kvmppc_mmu_book3s_64_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
 	mutex_lock(&vcpu->kvm->arch.hpt_mutex);
 
 do_second:
-	ptegp = kvmppc_mmu_book3s_64_get_pteg(vcpu_book3s, slbe, eaddr, second);
+	ptegp = kvmppc_mmu_book3s_64_get_pteg(vcpu, slbe, eaddr, second);
 	if (kvm_is_error_hva(ptegp))
 		goto no_page_found;
 

arch/powerpc/kvm/book3s_pr.c

@@ -66,7 +66,7 @@ void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 #endif
 	vcpu->cpu = smp_processor_id();
 #ifdef CONFIG_PPC_BOOK3S_32
-	current->thread.kvm_shadow_vcpu = to_book3s(vcpu)->shadow_vcpu;
+	current->thread.kvm_shadow_vcpu = vcpu->arch.shadow_vcpu;
 #endif
 }
 
@@ -1125,17 +1125,22 @@ struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
 	int err = -ENOMEM;
 	unsigned long p;
 
+	vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
+	if (!vcpu)
+		goto out;
+
 	vcpu_book3s = vzalloc(sizeof(struct kvmppc_vcpu_book3s));
 	if (!vcpu_book3s)
-		goto out;
+		goto free_vcpu;
+	vcpu->arch.book3s = vcpu_book3s;
 
 #ifdef CONFIG_KVM_BOOK3S_32
-	vcpu_book3s->shadow_vcpu =
-		kzalloc(sizeof(*vcpu_book3s->shadow_vcpu), GFP_KERNEL);
-	if (!vcpu_book3s->shadow_vcpu)
-		goto free_vcpu;
+	vcpu->arch.shadow_vcpu =
+		kzalloc(sizeof(*vcpu->arch.shadow_vcpu), GFP_KERNEL);
+	if (!vcpu->arch.shadow_vcpu)
+		goto free_vcpu3s;
 #endif
-	vcpu = &vcpu_book3s->vcpu;
+
 	err = kvm_vcpu_init(vcpu, kvm, id);
 	if (err)
 		goto free_shadow_vcpu;
@@ -1175,10 +1180,12 @@ uninit_vcpu:
 	kvm_vcpu_uninit(vcpu);
 free_shadow_vcpu:
 #ifdef CONFIG_KVM_BOOK3S_32
-	kfree(vcpu_book3s->shadow_vcpu);
-free_vcpu:
+	kfree(vcpu->arch.shadow_vcpu);
+free_vcpu3s:
 #endif
 	vfree(vcpu_book3s);
+free_vcpu:
+	kmem_cache_free(kvm_vcpu_cache, vcpu);
 out:
 	return ERR_PTR(err);
 }
@@ -1189,8 +1196,11 @@ void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
 
 	free_page((unsigned long)vcpu->arch.shared & PAGE_MASK);
 	kvm_vcpu_uninit(vcpu);
-	kfree(vcpu_book3s->shadow_vcpu);
+#ifdef CONFIG_KVM_BOOK3S_32
+	kfree(vcpu->arch.shadow_vcpu);
+#endif
 	vfree(vcpu_book3s);
+	kmem_cache_free(kvm_vcpu_cache, vcpu);
 }
 
 int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
@@ -1452,8 +1462,7 @@ static int kvmppc_book3s_init(void)
 {
 	int r;
 
-	r = kvm_init(NULL, sizeof(struct kvmppc_vcpu_book3s), 0,
-		     THIS_MODULE);
+	r = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
 
 	if (r)
 		return r;