From a357bd229cdaf37a41798d238ab50b34c71dd0d6 Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Tue, 13 Jul 2010 14:27:07 +0300 Subject: KVM: MMU: Add validate_direct_spte() helper Add a helper to verify that a direct shadow page is valid wrt the required access permissions; drop the page if it is not valid. Reviewed-by: Xiao Guangrong Signed-off-by: Avi Kivity Signed-off-by: Marcelo Tosatti --- arch/x86/kvm/paging_tmpl.h | 27 ++++++--------------------- 1 file changed, 6 insertions(+), 21 deletions(-) (limited to 'arch/x86/kvm/paging_tmpl.h') diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h index 0fb7068..0c7461d 100644 --- a/arch/x86/kvm/paging_tmpl.h +++ b/arch/x86/kvm/paging_tmpl.h @@ -338,30 +338,15 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr, break; } - if (is_shadow_present_pte(*sptep) && !is_large_pte(*sptep)) { - struct kvm_mmu_page *child; - - if (level != gw->level) - continue; - - /* - * For the direct sp, if the guest pte's dirty bit - * changed form clean to dirty, it will corrupt the - * sp's access: allow writable in the read-only sp, - * so we should update the spte at this point to get - * a new sp with the correct access. - */ - child = page_header(*sptep & PT64_BASE_ADDR_MASK); - if (child->role.access == direct_access) - continue; - - mmu_page_remove_parent_pte(child, sptep); - __set_spte(sptep, shadow_trap_nonpresent_pte); - kvm_flush_remote_tlbs(vcpu->kvm); - } + if (is_shadow_present_pte(*sptep) && !is_large_pte(*sptep) + && level == gw->level) + validate_direct_spte(vcpu, sptep, direct_access); drop_large_spte(vcpu, sptep); + if (is_shadow_present_pte(*sptep)) + continue; + if (level <= gw->level) { direct = 1; access = direct_access; -- cgit v1.1