diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/kvm/mmu.c | 6 | ||||
| -rw-r--r-- | drivers/kvm/paging_tmpl.h | 15 |
2 files changed, 18 insertions, 3 deletions
diff --git a/drivers/kvm/mmu.c b/drivers/kvm/mmu.c index a05d0609d91..22c426cd8cb 100644 --- a/drivers/kvm/mmu.c +++ b/drivers/kvm/mmu.c @@ -143,6 +143,7 @@ static int dbg = 1; #define PFERR_PRESENT_MASK (1U << 0) #define PFERR_WRITE_MASK (1U << 1) #define PFERR_USER_MASK (1U << 2) +#define PFERR_FETCH_MASK (1U << 4) #define PT64_ROOT_LEVEL 4 #define PT32_ROOT_LEVEL 2 @@ -168,6 +169,11 @@ static int is_cpuid_PSE36(void) return 1; } +static int is_nx(struct kvm_vcpu *vcpu) +{ + return vcpu->shadow_efer & EFER_NX; +} + static int is_present_pte(unsigned long pte) { return pte & PT_PRESENT_MASK; diff --git a/drivers/kvm/paging_tmpl.h b/drivers/kvm/paging_tmpl.h index afcd2a8f45b..149fa45fd9a 100644 --- a/drivers/kvm/paging_tmpl.h +++ b/drivers/kvm/paging_tmpl.h @@ -71,7 +71,7 @@ struct guest_walker { */ static int FNAME(walk_addr)(struct guest_walker *walker, struct kvm_vcpu *vcpu, gva_t addr, - int write_fault, int user_fault) + int write_fault, int user_fault, int fetch_fault) { hpa_t hpa; struct kvm_memory_slot *slot; @@ -123,6 +123,11 @@ static int FNAME(walk_addr)(struct guest_walker *walker, if (user_fault && !(*ptep & PT_USER_MASK)) goto access_error; +#if PTTYPE == 64 + if (fetch_fault && is_nx(vcpu) && (*ptep & PT64_NX_MASK)) + goto access_error; +#endif + if (!(*ptep & PT_ACCESSED_MASK)) *ptep |= PT_ACCESSED_MASK; /* avoid rmw */ @@ -169,6 +174,8 @@ err: walker->error_code |= PFERR_WRITE_MASK; if (user_fault) walker->error_code |= PFERR_USER_MASK; + if (fetch_fault) + walker->error_code |= PFERR_FETCH_MASK; return 0; } @@ -372,6 +379,7 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr, { int write_fault = error_code & PFERR_WRITE_MASK; int user_fault = error_code & PFERR_USER_MASK; + int fetch_fault = error_code & PFERR_FETCH_MASK; struct guest_walker walker; u64 *shadow_pte; int fixed; @@ -388,7 +396,8 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr, /* * Look up the shadow pte for the faulting address. */ - r = FNAME(walk_addr)(&walker, vcpu, addr, write_fault, user_fault); + r = FNAME(walk_addr)(&walker, vcpu, addr, write_fault, user_fault, + fetch_fault); /* * The page is not mapped by the guest. Let the guest handle it. @@ -437,7 +446,7 @@ static gpa_t FNAME(gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t vaddr) pt_element_t guest_pte; gpa_t gpa; - FNAME(walk_addr)(&walker, vcpu, vaddr, 0, 0); + FNAME(walk_addr)(&walker, vcpu, vaddr, 0, 0, 0); guest_pte = *walker.ptep; FNAME(release_walker)(&walker); |