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-rw-r--r--arch/powerpc/include/asm/kvm_book3s.h3
-rw-r--r--arch/powerpc/kvm/book3s_64_mmu_hv.c38
-rw-r--r--arch/powerpc/kvm/book3s_hv.c67
3 files changed, 78 insertions, 30 deletions
diff --git a/arch/powerpc/include/asm/kvm_book3s.h b/arch/powerpc/include/asm/kvm_book3s.h
index c941c21a1893..bcf6f4f52a22 100644
--- a/arch/powerpc/include/asm/kvm_book3s.h
+++ b/arch/powerpc/include/asm/kvm_book3s.h
@@ -138,6 +138,9 @@ extern void kvmppc_set_bat(struct kvm_vcpu *vcpu, struct kvmppc_bat *bat,
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 void *kvmppc_pin_guest_page(struct kvm *kvm, unsigned long addr,
+ unsigned long *nb_ret);
+extern void kvmppc_unpin_guest_page(struct kvm *kvm, void *addr);
extern void kvmppc_entry_trampoline(void);
extern void kvmppc_hv_entry_trampoline(void);
diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c
index e4c60698f41a..dcd39dc64f07 100644
--- a/arch/powerpc/kvm/book3s_64_mmu_hv.c
+++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c
@@ -184,6 +184,44 @@ static int kvmppc_mmu_book3s_64_hv_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
return -ENOENT;
}
+void *kvmppc_pin_guest_page(struct kvm *kvm, unsigned long gpa,
+ unsigned long *nb_ret)
+{
+ struct kvm_memory_slot *memslot;
+ unsigned long gfn = gpa >> PAGE_SHIFT;
+ struct page *page;
+ unsigned long offset;
+ unsigned long pfn, pa;
+ unsigned long *physp;
+
+ memslot = gfn_to_memslot(kvm, gfn);
+ if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID))
+ return NULL;
+ physp = kvm->arch.slot_phys[memslot->id];
+ if (!physp)
+ return NULL;
+ physp += (gfn - memslot->base_gfn) >>
+ (kvm->arch.ram_porder - PAGE_SHIFT);
+ pa = *physp;
+ if (!pa)
+ return NULL;
+ pfn = pa >> PAGE_SHIFT;
+ page = pfn_to_page(pfn);
+ get_page(page);
+ offset = gpa & (kvm->arch.ram_psize - 1);
+ if (nb_ret)
+ *nb_ret = kvm->arch.ram_psize - offset;
+ return page_address(page) + offset;
+}
+
+void kvmppc_unpin_guest_page(struct kvm *kvm, void *va)
+{
+ struct page *page = virt_to_page(va);
+
+ page = compound_head(page);
+ put_page(page);
+}
+
void kvmppc_mmu_book3s_hv_init(struct kvm_vcpu *vcpu)
{
struct kvmppc_mmu *mmu = &vcpu->arch.mmu;
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index a84fedc48d99..82d71388eace 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -139,12 +139,10 @@ static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu,
unsigned long vcpuid, unsigned long vpa)
{
struct kvm *kvm = vcpu->kvm;
- unsigned long gfn, pg_index, ra, len;
- unsigned long pg_offset;
+ unsigned long len, nb;
void *va;
struct kvm_vcpu *tvcpu;
- struct kvm_memory_slot *memslot;
- unsigned long *physp;
+ int err = H_PARAMETER;
tvcpu = kvmppc_find_vcpu(kvm, vcpuid);
if (!tvcpu)
@@ -157,51 +155,41 @@ static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu,
if (flags < 4) {
if (vpa & 0x7f)
return H_PARAMETER;
+ if (flags >= 2 && !tvcpu->arch.vpa)
+ return H_RESOURCE;
/* registering new area; convert logical addr to real */
- gfn = vpa >> PAGE_SHIFT;
- memslot = gfn_to_memslot(kvm, gfn);
- if (!memslot || !(memslot->flags & KVM_MEMSLOT_INVALID))
- return H_PARAMETER;
- physp = kvm->arch.slot_phys[memslot->id];
- if (!physp)
- return H_PARAMETER;
- pg_index = (gfn - memslot->base_gfn) >>
- (kvm->arch.ram_porder - PAGE_SHIFT);
- pg_offset = vpa & (kvm->arch.ram_psize - 1);
- ra = physp[pg_index];
- if (!ra)
+ va = kvmppc_pin_guest_page(kvm, vpa, &nb);
+ if (va == NULL)
return H_PARAMETER;
- ra = (ra & PAGE_MASK) | pg_offset;
- va = __va(ra);
if (flags <= 1)
len = *(unsigned short *)(va + 4);
else
len = *(unsigned int *)(va + 4);
- if (pg_offset + len > kvm->arch.ram_psize)
- return H_PARAMETER;
+ if (len > nb)
+ goto out_unpin;
switch (flags) {
case 1: /* register VPA */
if (len < 640)
- return H_PARAMETER;
+ goto out_unpin;
+ if (tvcpu->arch.vpa)
+ kvmppc_unpin_guest_page(kvm, vcpu->arch.vpa);
tvcpu->arch.vpa = va;
init_vpa(vcpu, va);
break;
case 2: /* register DTL */
if (len < 48)
- return H_PARAMETER;
- if (!tvcpu->arch.vpa)
- return H_RESOURCE;
+ goto out_unpin;
len -= len % 48;
+ if (tvcpu->arch.dtl)
+ kvmppc_unpin_guest_page(kvm, vcpu->arch.dtl);
tvcpu->arch.dtl = va;
tvcpu->arch.dtl_end = va + len;
break;
case 3: /* register SLB shadow buffer */
- if (len < 8)
- return H_PARAMETER;
- if (!tvcpu->arch.vpa)
- return H_RESOURCE;
- tvcpu->arch.slb_shadow = va;
- len = (len - 16) / 16;
+ if (len < 16)
+ goto out_unpin;
+ if (tvcpu->arch.slb_shadow)
+ kvmppc_unpin_guest_page(kvm, vcpu->arch.slb_shadow);
tvcpu->arch.slb_shadow = va;
break;
}
@@ -210,17 +198,30 @@ static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu,
case 5: /* unregister VPA */
if (tvcpu->arch.slb_shadow || tvcpu->arch.dtl)
return H_RESOURCE;
+ if (!tvcpu->arch.vpa)
+ break;
+ kvmppc_unpin_guest_page(kvm, tvcpu->arch.vpa);
tvcpu->arch.vpa = NULL;
break;
case 6: /* unregister DTL */
+ if (!tvcpu->arch.dtl)
+ break;
+ kvmppc_unpin_guest_page(kvm, tvcpu->arch.dtl);
tvcpu->arch.dtl = NULL;
break;
case 7: /* unregister SLB shadow buffer */
+ if (!tvcpu->arch.slb_shadow)
+ break;
+ kvmppc_unpin_guest_page(kvm, tvcpu->arch.slb_shadow);
tvcpu->arch.slb_shadow = NULL;
break;
}
}
return H_SUCCESS;
+
+ out_unpin:
+ kvmppc_unpin_guest_page(kvm, va);
+ return err;
}
int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu)
@@ -470,6 +471,12 @@ out:
void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
{
+ if (vcpu->arch.dtl)
+ kvmppc_unpin_guest_page(vcpu->kvm, vcpu->arch.dtl);
+ if (vcpu->arch.slb_shadow)
+ kvmppc_unpin_guest_page(vcpu->kvm, vcpu->arch.slb_shadow);
+ if (vcpu->arch.vpa)
+ kvmppc_unpin_guest_page(vcpu->kvm, vcpu->arch.vpa);
kvm_vcpu_uninit(vcpu);
kfree(vcpu);
}
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