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| author | Sean Christopherson <sean.j.christopherson@intel.com> | 2019-03-07 15:27:43 -0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2019-03-28 17:27:01 +0100 |
| commit | 552c69b1dc714854a5f4e27d37a43c6d797adf7d (patch) | |
| tree | 5fac7426d1fda090e858be226e59acde6d278987 | |
| parent | 8c2ffd9174779014c3fe1f96d9dc3641d9175f00 (diff) | |
| download | linux-0-day-552c69b1dc714854a5f4e27d37a43c6d797adf7d.tar.gz linux-0-day-552c69b1dc714854a5f4e27d37a43c6d797adf7d.tar.xz | |
KVM: nVMX: Do not inherit quadrant and invalid for the root shadow EPT
Explicitly zero out quadrant and invalid instead of inheriting them from
the root_mmu. Functionally, this patch is a nop as we (should) never
set quadrant for a direct mapped (EPT) root_mmu and nested EPT is only
allowed if EPT is used for L1, and the root_mmu will never be invalid at
this point.
Explicitly setting flags sets the stage for repurposing the legacy
paging bits in role, e.g. nxe, cr0_wp, and sm{a,e}p_andnot_wp, at which
point 'smm' would be the only flag to be inherited from root_mmu.
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | arch/x86/kvm/mmu.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 7837ab001d806..01bb090aaa5c1 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -4918,11 +4918,15 @@ static union kvm_mmu_role kvm_calc_shadow_ept_root_page_role(struct kvm_vcpu *vcpu, bool accessed_dirty, bool execonly) { - union kvm_mmu_role role; + union kvm_mmu_role role = {0}; + union kvm_mmu_page_role root_base = vcpu->arch.root_mmu.mmu_role.base; - /* Base role is inherited from root_mmu */ - role.base.word = vcpu->arch.root_mmu.mmu_role.base.word; - role.ext = kvm_calc_mmu_role_ext(vcpu); + /* Legacy paging and SMM flags are inherited from root_mmu */ + role.base.smm = root_base.smm; + role.base.nxe = root_base.nxe; + role.base.cr0_wp = root_base.cr0_wp; + role.base.smep_andnot_wp = root_base.smep_andnot_wp; + role.base.smap_andnot_wp = root_base.smap_andnot_wp; role.base.level = PT64_ROOT_4LEVEL; role.base.direct = false; @@ -4930,6 +4934,7 @@ kvm_calc_shadow_ept_root_page_role(struct kvm_vcpu *vcpu, bool accessed_dirty, role.base.guest_mode = true; role.base.access = ACC_ALL; + role.ext = kvm_calc_mmu_role_ext(vcpu); role.ext.execonly = execonly; return role; |