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-rw-r--r--arch/powerpc/include/asm/kvm_book3s.h1
-rw-r--r--arch/powerpc/kvm/book3s.c35
-rw-r--r--arch/powerpc/kvm/book3s_32_mmu.c16
-rw-r--r--arch/powerpc/kvm/book3s_32_mmu_host.c2
-rw-r--r--arch/powerpc/kvm/book3s_64_mmu.c30
-rw-r--r--arch/powerpc/kvm/book3s_64_mmu_host.c9
6 files changed, 81 insertions, 12 deletions
diff --git a/arch/powerpc/include/asm/kvm_book3s.h b/arch/powerpc/include/asm/kvm_book3s.h
index b5b1961..00cf8b0 100644
--- a/arch/powerpc/include/asm/kvm_book3s.h
+++ b/arch/powerpc/include/asm/kvm_book3s.h
@@ -130,6 +130,7 @@ extern void kvmppc_set_bat(struct kvm_vcpu *vcpu, struct kvmppc_bat *bat,
bool upper, u32 val);
extern void kvmppc_giveup_ext(struct kvm_vcpu *vcpu, ulong msr);
extern int kvmppc_emulate_paired_single(struct kvm_run *run, struct kvm_vcpu *vcpu);
+extern pfn_t kvmppc_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn);
extern u32 kvmppc_trampoline_lowmem;
extern u32 kvmppc_trampoline_enter;
diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index 0ed5376..eee97b5 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -419,6 +419,25 @@ void kvmppc_set_pvr(struct kvm_vcpu *vcpu, u32 pvr)
}
}
+pfn_t kvmppc_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn)
+{
+ ulong mp_pa = vcpu->arch.magic_page_pa;
+
+ /* Magic page override */
+ if (unlikely(mp_pa) &&
+ unlikely(((gfn << PAGE_SHIFT) & KVM_PAM) ==
+ ((mp_pa & PAGE_MASK) & KVM_PAM))) {
+ ulong shared_page = ((ulong)vcpu->arch.shared) & PAGE_MASK;
+ pfn_t pfn;
+
+ pfn = (pfn_t)virt_to_phys((void*)shared_page) >> PAGE_SHIFT;
+ get_page(pfn_to_page(pfn));
+ return pfn;
+ }
+
+ return gfn_to_pfn(vcpu->kvm, gfn);
+}
+
/* Book3s_32 CPUs always have 32 bytes cache line size, which Linux assumes. To
* make Book3s_32 Linux work on Book3s_64, we have to make sure we trap dcbz to
* emulate 32 bytes dcbz length.
@@ -554,6 +573,13 @@ mmio:
static int kvmppc_visible_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
{
+ ulong mp_pa = vcpu->arch.magic_page_pa;
+
+ if (unlikely(mp_pa) &&
+ unlikely((mp_pa & KVM_PAM) >> PAGE_SHIFT == gfn)) {
+ return 1;
+ }
+
return kvm_is_visible_gfn(vcpu->kvm, gfn);
}
@@ -1257,6 +1283,7 @@ struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
struct kvmppc_vcpu_book3s *vcpu_book3s;
struct kvm_vcpu *vcpu;
int err = -ENOMEM;
+ unsigned long p;
vcpu_book3s = vmalloc(sizeof(struct kvmppc_vcpu_book3s));
if (!vcpu_book3s)
@@ -1274,8 +1301,10 @@ struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
if (err)
goto free_shadow_vcpu;
- vcpu->arch.shared = (void*)__get_free_page(GFP_KERNEL|__GFP_ZERO);
- if (!vcpu->arch.shared)
+ p = __get_free_page(GFP_KERNEL|__GFP_ZERO);
+ /* the real shared page fills the last 4k of our page */
+ vcpu->arch.shared = (void*)(p + PAGE_SIZE - 4096);
+ if (!p)
goto uninit_vcpu;
vcpu->arch.host_retip = kvm_return_point;
@@ -1322,7 +1351,7 @@ void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
{
struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
- free_page((unsigned long)vcpu->arch.shared);
+ free_page((unsigned long)vcpu->arch.shared & PAGE_MASK);
kvm_vcpu_uninit(vcpu);
kfree(vcpu_book3s->shadow_vcpu);
vfree(vcpu_book3s);
diff --git a/arch/powerpc/kvm/book3s_32_mmu.c b/arch/powerpc/kvm/book3s_32_mmu.c
index 449bce5..a7d121a 100644
--- a/arch/powerpc/kvm/book3s_32_mmu.c
+++ b/arch/powerpc/kvm/book3s_32_mmu.c
@@ -281,8 +281,24 @@ static int kvmppc_mmu_book3s_32_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
struct kvmppc_pte *pte, bool data)
{
int r;
+ ulong mp_ea = vcpu->arch.magic_page_ea;
pte->eaddr = eaddr;
+
+ /* Magic page override */
+ if (unlikely(mp_ea) &&
+ unlikely((eaddr & ~0xfffULL) == (mp_ea & ~0xfffULL)) &&
+ !(vcpu->arch.shared->msr & MSR_PR)) {
+ pte->vpage = kvmppc_mmu_book3s_32_ea_to_vp(vcpu, eaddr, data);
+ pte->raddr = vcpu->arch.magic_page_pa | (pte->raddr & 0xfff);
+ pte->raddr &= KVM_PAM;
+ pte->may_execute = true;
+ pte->may_read = true;
+ pte->may_write = true;
+
+ return 0;
+ }
+
r = kvmppc_mmu_book3s_32_xlate_bat(vcpu, eaddr, pte, data);
if (r < 0)
r = kvmppc_mmu_book3s_32_xlate_pte(vcpu, eaddr, pte, data, true);
diff --git a/arch/powerpc/kvm/book3s_32_mmu_host.c b/arch/powerpc/kvm/book3s_32_mmu_host.c
index 67b8c38..05e8c9e 100644
--- a/arch/powerpc/kvm/book3s_32_mmu_host.c
+++ b/arch/powerpc/kvm/book3s_32_mmu_host.c
@@ -147,7 +147,7 @@ int kvmppc_mmu_map_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *orig_pte)
struct hpte_cache *pte;
/* Get host physical address for gpa */
- hpaddr = gfn_to_pfn(vcpu->kvm, orig_pte->raddr >> PAGE_SHIFT);
+ hpaddr = kvmppc_gfn_to_pfn(vcpu, orig_pte->raddr >> PAGE_SHIFT);
if (kvm_is_error_hva(hpaddr)) {
printk(KERN_INFO "Couldn't get guest page for gfn %lx!\n",
orig_pte->eaddr);
diff --git a/arch/powerpc/kvm/book3s_64_mmu.c b/arch/powerpc/kvm/book3s_64_mmu.c
index 58aa840..d7889ef 100644
--- a/arch/powerpc/kvm/book3s_64_mmu.c
+++ b/arch/powerpc/kvm/book3s_64_mmu.c
@@ -163,6 +163,22 @@ static int kvmppc_mmu_book3s_64_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
bool found = false;
bool perm_err = false;
int second = 0;
+ ulong mp_ea = vcpu->arch.magic_page_ea;
+
+ /* Magic page override */
+ if (unlikely(mp_ea) &&
+ unlikely((eaddr & ~0xfffULL) == (mp_ea & ~0xfffULL)) &&
+ !(vcpu->arch.shared->msr & MSR_PR)) {
+ gpte->eaddr = eaddr;
+ gpte->vpage = kvmppc_mmu_book3s_64_ea_to_vp(vcpu, eaddr, data);
+ gpte->raddr = vcpu->arch.magic_page_pa | (gpte->raddr & 0xfff);
+ gpte->raddr &= KVM_PAM;
+ gpte->may_execute = true;
+ gpte->may_read = true;
+ gpte->may_write = true;
+
+ return 0;
+ }
slbe = kvmppc_mmu_book3s_64_find_slbe(vcpu_book3s, eaddr);
if (!slbe)
@@ -445,6 +461,7 @@ static int kvmppc_mmu_book3s_64_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid,
ulong ea = esid << SID_SHIFT;
struct kvmppc_slb *slb;
u64 gvsid = esid;
+ ulong mp_ea = vcpu->arch.magic_page_ea;
if (vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) {
slb = kvmppc_mmu_book3s_64_find_slbe(to_book3s(vcpu), ea);
@@ -464,7 +481,7 @@ static int kvmppc_mmu_book3s_64_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid,
break;
case MSR_DR|MSR_IR:
if (!slb)
- return -ENOENT;
+ goto no_slb;
*vsid = gvsid;
break;
@@ -477,6 +494,17 @@ static int kvmppc_mmu_book3s_64_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid,
*vsid |= VSID_PR;
return 0;
+
+no_slb:
+ /* Catch magic page case */
+ if (unlikely(mp_ea) &&
+ unlikely(esid == (mp_ea >> SID_SHIFT)) &&
+ !(vcpu->arch.shared->msr & MSR_PR)) {
+ *vsid = VSID_REAL | esid;
+ return 0;
+ }
+
+ return -EINVAL;
}
static bool kvmppc_mmu_book3s_64_is_dcbz32(struct kvm_vcpu *vcpu)
diff --git a/arch/powerpc/kvm/book3s_64_mmu_host.c b/arch/powerpc/kvm/book3s_64_mmu_host.c
index 71c1f90..6cdd19a 100644
--- a/arch/powerpc/kvm/book3s_64_mmu_host.c
+++ b/arch/powerpc/kvm/book3s_64_mmu_host.c
@@ -101,18 +101,13 @@ int kvmppc_mmu_map_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *orig_pte)
struct kvmppc_sid_map *map;
/* Get host physical address for gpa */
- hpaddr = gfn_to_pfn(vcpu->kvm, orig_pte->raddr >> PAGE_SHIFT);
+ hpaddr = kvmppc_gfn_to_pfn(vcpu, orig_pte->raddr >> PAGE_SHIFT);
if (kvm_is_error_hva(hpaddr)) {
printk(KERN_INFO "Couldn't get guest page for gfn %lx!\n", orig_pte->eaddr);
return -EINVAL;
}
hpaddr <<= PAGE_SHIFT;
-#if PAGE_SHIFT == 12
-#elif PAGE_SHIFT == 16
- hpaddr |= orig_pte->raddr & 0xf000;
-#else
-#error Unknown page size
-#endif
+ hpaddr |= orig_pte->raddr & (~0xfffULL & ~PAGE_MASK);
/* and write the mapping ea -> hpa into the pt */
vcpu->arch.mmu.esid_to_vsid(vcpu, orig_pte->eaddr >> SID_SHIFT, &vsid);
generated by cgit v1.1 at 2024-06-19 02:14:20 +0000