xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

KVM: MMU: fix SMAP virtualization

Browse Source 
KVM may turn a user page to a kernel page when kernel writes a readonly
user page if CR0.WP = 1. This shadow page entry will be reused after
SMAP is enabled so that kernel is allowed to access this user page

Fix it by setting SMAP && !CR0.WP into shadow page's role and reset mmu
once CR4.SMAP is updated

Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Xiao Guangrong
2015-05-11 22:55:21 +08:00
committed by Paolo Bonzini
parent 428e3d0857
commit edc90b7dc4
5 changed files with 30 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/kvm/mmu.h
View File

@@ -71,8 +71,6 @@ enum {
int handle_mmio_page_fault_common(struct kvm_vcpu *vcpu, u64 addr, bool direct);
void kvm_init_shadow_mmu(struct kvm_vcpu *vcpu);
void kvm_init_shadow_ept_mmu(struct kvm_vcpu *vcpu, bool execonly);
void update_permission_bitmask(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
bool ept);
static inline unsigned int kvm_mmu_available_pages(struct kvm *kvm)
{