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KVM: MMU: Implement nested gva_to_gpa functions 

This patch adds the functions to do a nested l2_gva to
l1_gpa page table walk.

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 17:30:50 +02:00 committed by Avi Kivity
parent 14dfe855f9
commit 6539e738f6
4 changed files with 54 additions and 0 deletions
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10
arch/x86/include/asm/kvm_host.h
View File

@ -295,6 +295,16 @@ struct kvm_vcpu_arch {
*/
struct kvm_mmu mmu;
/*
* Paging state of an L2 guest (used for nested npt)
*
* This context will save all necessary information to walk page tables
* of the an L2 guest. This context is only initialized for page table
* walking and not for faulting since we never handle l2 page faults on
* the host.
*/
struct kvm_mmu nested_mmu;
/*
* Pointer to the mmu context currently used for
* gva_to_gpa translations.

8
arch/x86/kvm/mmu.c
View File

@ -2466,6 +2466,14 @@ static gpa_t nonpaging_gva_to_gpa(struct kvm_vcpu *vcpu, gva_t vaddr,
return vaddr;
}
static gpa_t nonpaging_gva_to_gpa_nested(struct kvm_vcpu *vcpu, gva_t vaddr,
u32 access, u32 *error)
{
if (error)
*error = 0;
return vcpu->arch.nested_mmu.translate_gpa(vcpu, vaddr, access);
}
static int nonpaging_page_fault(struct kvm_vcpu *vcpu, gva_t gva,
u32 error_code)
{

31
arch/x86/kvm/paging_tmpl.h
View File

@ -276,6 +276,16 @@ static int FNAME(walk_addr)(struct guest_walker *walker,
write_fault, user_fault, fetch_fault);
}
static int FNAME(walk_addr_nested)(struct guest_walker *walker,
struct kvm_vcpu *vcpu, gva_t addr,
int write_fault, int user_fault,
int fetch_fault)
{
return FNAME(walk_addr_generic)(walker, vcpu, &vcpu->arch.nested_mmu,
addr, write_fault, user_fault,
fetch_fault);
}
static void FNAME(update_pte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
u64 *spte, const void *pte)
{
@ -660,6 +670,27 @@ static gpa_t FNAME(gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t vaddr, u32 access,
return gpa;
}
static gpa_t FNAME(gva_to_gpa_nested)(struct kvm_vcpu *vcpu, gva_t vaddr,
u32 access, u32 *error)
{
struct guest_walker walker;
gpa_t gpa = UNMAPPED_GVA;
int r;
r = FNAME(walk_addr_nested)(&walker, vcpu, vaddr,
access & PFERR_WRITE_MASK,
access & PFERR_USER_MASK,
access & PFERR_FETCH_MASK);
if (r) {
gpa = gfn_to_gpa(walker.gfn);
gpa |= vaddr & ~PAGE_MASK;
} else if (error)
*error = walker.error_code;
return gpa;
}
static void FNAME(prefetch_page)(struct kvm_vcpu *vcpu,
struct kvm_mmu_page *sp)
{

5
arch/x86/kvm/x86.h
View File

@ -50,6 +50,11 @@ static inline int is_long_mode(struct kvm_vcpu *vcpu)
#endif
}
static inline bool mmu_is_nested(struct kvm_vcpu *vcpu)
{
return vcpu->arch.walk_mmu == &vcpu->arch.nested_mmu;
}
static inline int is_pae(struct kvm_vcpu *vcpu)
{
return kvm_read_cr4_bits(vcpu, X86_CR4_PAE);