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| author | Ingo Molnar <mingo@kernel.org> | 2015-05-08 14:33:33 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-05-08 14:33:33 +0300 |
| commit | 7ae383be81781c5e1347f71c3eb0d53ce5188200 (patch) | |
| tree | d2dfedb78cf4ee2bc9cc460af3be106b08e01050 /arch/x86/kvm/vmx.c | |
| parent | 2a4e90b18c256d52a7f3f77d58114f6d4e4a7f9f (diff) | |
| parent | 3e0283a53f7d2f2dae7bc4aa7f3104cb5988018f (diff) | |
| download | linux-7ae383be81781c5e1347f71c3eb0d53ce5188200.tar.xz | |
Merge branch 'linus' into x86/asm, before applying dependent patch
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kvm/vmx.c')
| -rw-r--r-- | arch/x86/kvm/vmx.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index f5e8dce8046c..f7b61687bd79 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -3622,8 +3622,16 @@ static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3) static int vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4) { - unsigned long hw_cr4 = cr4 | (to_vmx(vcpu)->rmode.vm86_active ? - KVM_RMODE_VM_CR4_ALWAYS_ON : KVM_PMODE_VM_CR4_ALWAYS_ON); + /* + * Pass through host's Machine Check Enable value to hw_cr4, which + * is in force while we are in guest mode. Do not let guests control + * this bit, even if host CR4.MCE == 0. + */ + unsigned long hw_cr4 = + (cr4_read_shadow() & X86_CR4_MCE) | + (cr4 & ~X86_CR4_MCE) | + (to_vmx(vcpu)->rmode.vm86_active ? + KVM_RMODE_VM_CR4_ALWAYS_ON : KVM_PMODE_VM_CR4_ALWAYS_ON); if (cr4 & X86_CR4_VMXE) { /* |