diff options
| -rw-r--r-- | drivers/kvm/mmu.c | 17 | ||||
| -rw-r--r-- | drivers/kvm/paging_tmpl.h | 34 |
2 files changed, 23 insertions, 28 deletions
diff --git a/drivers/kvm/mmu.c b/drivers/kvm/mmu.c index a7631502f22..2079d69f186 100644 --- a/drivers/kvm/mmu.c +++ b/drivers/kvm/mmu.c @@ -972,23 +972,6 @@ static void inject_page_fault(struct kvm_vcpu *vcpu, kvm_arch_ops->inject_page_fault(vcpu, addr, err_code); } -static inline int fix_read_pf(u64 *shadow_ent) -{ - if ((*shadow_ent & PT_SHADOW_USER_MASK) && - !(*shadow_ent & PT_USER_MASK)) { - /* - * If supervisor write protect is disabled, we shadow kernel - * pages as user pages so we can trap the write access. - */ - *shadow_ent |= PT_USER_MASK; - *shadow_ent &= ~PT_WRITABLE_MASK; - - return 1; - - } - return 0; -} - static void paging_free(struct kvm_vcpu *vcpu) { nonpaging_free(vcpu); diff --git a/drivers/kvm/paging_tmpl.h b/drivers/kvm/paging_tmpl.h index 7e998d19384..869582befaf 100644 --- a/drivers/kvm/paging_tmpl.h +++ b/drivers/kvm/paging_tmpl.h @@ -197,6 +197,7 @@ static void FNAME(set_pte_common)(struct kvm_vcpu *vcpu, gpa_t gaddr, pt_element_t *gpte, u64 access_bits, + int write_fault, gfn_t gfn) { hpa_t paddr; @@ -219,6 +220,17 @@ static void FNAME(set_pte_common)(struct kvm_vcpu *vcpu, *shadow_pte |= paddr; + if (!write_fault && (*shadow_pte & PT_SHADOW_USER_MASK) && + !(*shadow_pte & PT_USER_MASK)) { + /* + * If supervisor write protect is disabled, we shadow kernel + * pages as user pages so we can trap the write access. + */ + *shadow_pte |= PT_USER_MASK; + *shadow_pte &= ~PT_WRITABLE_MASK; + access_bits &= ~PT_WRITABLE_MASK; + } + if (access_bits & PT_WRITABLE_MASK) { struct kvm_mmu_page *shadow; @@ -242,13 +254,14 @@ static void FNAME(set_pte_common)(struct kvm_vcpu *vcpu, } static void FNAME(set_pte)(struct kvm_vcpu *vcpu, pt_element_t *gpte, - u64 *shadow_pte, u64 access_bits, gfn_t gfn) + u64 *shadow_pte, u64 access_bits, + int write_fault, gfn_t gfn) { ASSERT(*shadow_pte == 0); access_bits &= *gpte; *shadow_pte = (*gpte & PT_PTE_COPY_MASK); FNAME(set_pte_common)(vcpu, shadow_pte, *gpte & PT_BASE_ADDR_MASK, - gpte, access_bits, gfn); + gpte, access_bits, write_fault, gfn); } static void FNAME(update_pte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *page, @@ -262,12 +275,13 @@ static void FNAME(update_pte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *page, if (~gpte & (PT_PRESENT_MASK | PT_ACCESSED_MASK)) return; pgprintk("%s: gpte %llx spte %p\n", __FUNCTION__, (u64)gpte, spte); - FNAME(set_pte)(vcpu, &gpte, spte, PT_USER_MASK | PT_WRITABLE_MASK, + FNAME(set_pte)(vcpu, &gpte, spte, PT_USER_MASK | PT_WRITABLE_MASK, 0, (gpte & PT_BASE_ADDR_MASK) >> PAGE_SHIFT); } static void FNAME(set_pde)(struct kvm_vcpu *vcpu, pt_element_t *gpde, - u64 *shadow_pte, u64 access_bits, gfn_t gfn) + u64 *shadow_pte, u64 access_bits, int write_fault, + gfn_t gfn) { gpa_t gaddr; @@ -279,14 +293,14 @@ static void FNAME(set_pde)(struct kvm_vcpu *vcpu, pt_element_t *gpde, (32 - PT32_DIR_PSE36_SHIFT); *shadow_pte = *gpde & PT_PTE_COPY_MASK; FNAME(set_pte_common)(vcpu, shadow_pte, gaddr, - gpde, access_bits, gfn); + gpde, access_bits, write_fault, gfn); } /* * Fetch a shadow pte for a specific level in the paging hierarchy. */ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr, - struct guest_walker *walker) + struct guest_walker *walker, int write_fault) { hpa_t shadow_addr; int level; @@ -351,12 +365,12 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr, if (prev_shadow_ent) *prev_shadow_ent |= PT_SHADOW_PS_MARK; FNAME(set_pde)(vcpu, guest_ent, shadow_ent, - walker->inherited_ar, walker->gfn); + walker->inherited_ar, write_fault, walker->gfn); } else { ASSERT(walker->level == PT_PAGE_TABLE_LEVEL); FNAME(set_pte)(vcpu, guest_ent, shadow_ent, walker->inherited_ar, - walker->gfn); + write_fault, walker->gfn); } return shadow_ent; } @@ -489,7 +503,7 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr, return 0; } - shadow_pte = FNAME(fetch)(vcpu, addr, &walker); + shadow_pte = FNAME(fetch)(vcpu, addr, &walker, write_fault); pgprintk("%s: shadow pte %p %llx\n", __FUNCTION__, shadow_pte, *shadow_pte); @@ -499,8 +513,6 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr, if (write_fault) fixed = FNAME(fix_write_pf)(vcpu, shadow_pte, &walker, addr, user_fault, &write_pt); - else - fixed = fix_read_pf(shadow_pte); pgprintk("%s: updated shadow pte %p %llx\n", __FUNCTION__, shadow_pte, *shadow_pte); |