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KVM: MMU: Add infrastructure for two-level page walker

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This patch introduces a mmu-callback to translate gpa
addresses in the walk_addr code. This is later used to
translate l2_gpa addresses into l1_gpa addresses.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Joerg Roedel 2010-09-10 17:30:48 +02:00 committed by Avi Kivity
parent 1e301feb07
commit c30a358d33
3 changed files with 12 additions and 0 deletions
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1
arch/x86/include/asm/kvm_host.h
View File

@ -243,6 +243,7 @@ struct kvm_mmu {
void (*free)(struct kvm_vcpu *vcpu);
gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t gva, u32 access,
u32 *error);
gpa_t (*translate_gpa)(struct kvm_vcpu *vcpu, gpa_t gpa, u32 access);
void (*prefetch_page)(struct kvm_vcpu *vcpu,
struct kvm_mmu_page *page);
int (*sync_page)(struct kvm_vcpu *vcpu,

6
arch/x86/kvm/x86.c
View File

@ -3448,6 +3448,11 @@ void kvm_get_segment(struct kvm_vcpu *vcpu,
kvm_x86_ops->get_segment(vcpu, var, seg);
}
static gpa_t translate_gpa(struct kvm_vcpu *vcpu, gpa_t gpa, u32 access)
{
return gpa;
}
gpa_t kvm_mmu_gva_to_gpa_read(struct kvm_vcpu *vcpu, gva_t gva, u32 *error)
{
u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
@ -5659,6 +5664,7 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
vcpu->arch.emulate_ctxt.ops = &emulate_ops;
vcpu->arch.mmu.root_hpa = INVALID_PAGE;
vcpu->arch.mmu.translate_gpa = translate_gpa;
if (!irqchip_in_kernel(kvm) || kvm_vcpu_is_bsp(vcpu))
vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
else

5
include/linux/kvm_host.h
View File

@ -534,6 +534,11 @@ static inline gpa_t gfn_to_gpa(gfn_t gfn)
return (gpa_t)gfn << PAGE_SHIFT;
}
static inline gfn_t gpa_to_gfn(gpa_t gpa)
{
return (gfn_t)(gpa >> PAGE_SHIFT);
}
static inline hpa_t pfn_to_hpa(pfn_t pfn)
{
return (hpa_t)pfn << PAGE_SHIFT;