diff options
| author | David Matlack <dmatlack@google.com> | 2016-11-29 18:14:10 -0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-12-08 15:31:08 +0100 |
| commit | 5a6a9748b4b41c1708dca12342256a19434513f2 (patch) | |
| tree | 1c34c6ca242bc39e266971041d91425bdcc71b18 /arch/x86/kvm | |
| parent | 8322ebbb24088c22049ef53cd066c6c220640edb (diff) | |
| download | linux-5a6a9748b4b41c1708dca12342256a19434513f2.tar.bz2 | |
KVM: nVMX: load GUEST_EFER after GUEST_CR0 during emulated VM-entry
vmx_set_cr0() modifies GUEST_EFER and "IA-32e mode guest" in the current
VMCS. Call vmx_set_efer() after vmx_set_cr0() so that emulated VM-entry
is more faithful to VMCS12.
This patch correctly causes VM-entry to fail when "IA-32e mode guest" is
1 and GUEST_CR0.PG is 0. Previously this configuration would succeed and
"IA-32e mode guest" would silently be disabled by KVM.
Signed-off-by: David Matlack <dmatlack@google.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Diffstat (limited to 'arch/x86/kvm')
| -rw-r--r-- | arch/x86/kvm/vmx.c | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index fa29585c63ff..d1a4f42f6c97 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -10272,15 +10272,6 @@ static void prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12) nested_ept_init_mmu_context(vcpu); } - if (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_EFER) - vcpu->arch.efer = vmcs12->guest_ia32_efer; - else if (vmcs12->vm_entry_controls & VM_ENTRY_IA32E_MODE) - vcpu->arch.efer |= (EFER_LMA | EFER_LME); - else - vcpu->arch.efer &= ~(EFER_LMA | EFER_LME); - /* Note: modifies VM_ENTRY/EXIT_CONTROLS and GUEST/HOST_IA32_EFER */ - vmx_set_efer(vcpu, vcpu->arch.efer); - /* * This sets GUEST_CR0 to vmcs12->guest_cr0, with possibly a modified * TS bit (for lazy fpu) and bits which we consider mandatory enabled. @@ -10295,6 +10286,15 @@ static void prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12) vmx_set_cr4(vcpu, vmcs12->guest_cr4); vmcs_writel(CR4_READ_SHADOW, nested_read_cr4(vmcs12)); + if (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_EFER) + vcpu->arch.efer = vmcs12->guest_ia32_efer; + else if (vmcs12->vm_entry_controls & VM_ENTRY_IA32E_MODE) + vcpu->arch.efer |= (EFER_LMA | EFER_LME); + else + vcpu->arch.efer &= ~(EFER_LMA | EFER_LME); + /* Note: modifies VM_ENTRY/EXIT_CONTROLS and GUEST/HOST_IA32_EFER */ + vmx_set_efer(vcpu, vcpu->arch.efer); + /* shadow page tables on either EPT or shadow page tables */ kvm_set_cr3(vcpu, vmcs12->guest_cr3); kvm_mmu_reset_context(vcpu); |