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KVM: nVMX: load GUEST_EFER after GUEST_CR0 during emulated VM-entry

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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>
This commit is contained in:
David Matlack 2016-11-29 18:14:10 -08:00 committed by Paolo Bonzini
parent 8322ebbb24
commit 5a6a9748b4
1 changed files with 9 additions and 9 deletions
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18
arch/x86/kvm/vmx.c
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@ -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);