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>

3 files changed, 30 insertions, 22 deletions

diff --git a/arch/powerpc/kvm/book3s_32_mmu.c b/arch/powerpc/kvm/book3s_32_mmu.c
index 856af988ad59..b14af6d09347 100644
--- a/arch/powerpc/kvm/book3s_32_mmu.c
+++ b/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;
diff --git a/arch/powerpc/kvm/book3s_64_mmu.c b/arch/powerpc/kvm/book3s_64_mmu.c
index ad9ecfd29c4c..c110145522e6 100644
--- a/arch/powerpc/kvm/book3s_64_mmu.c
+++ b/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;
 
diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
index 4fa73c3f5713..677d7e33b1ff 100644
--- a/arch/powerpc/kvm/book3s_pr.c
+++ b/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;