Now that KVM stuffs vmc01.GUEST_CR3 prior to nested VM-Entry, there is
no need to avoid nested_vmx_restore_host_state() when EPT is disabled
as refreshing vcpu->arch.cr3 from vmcs01.GUEST_CR3 will automagically
obtain the correct value.
This reverts commit 2b27924bb1d48e3775f432b70bdad5e6dd4e7798.
Signed-off-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
---
arch/x86/include/uapi/asm/vmx.h | 1 -
arch/x86/kvm/vmx/nested.c | 22 ++--------------------
2 files changed, 2 insertions(+), 21 deletions(-)
diff --git a/arch/x86/include/uapi/asm/vmx.h b/arch/x86/include/uapi/asm/vmx.h
index d213ec5c3766..f0b0c90dd398 100644
--- a/arch/x86/include/uapi/asm/vmx.h
+++ b/arch/x86/include/uapi/asm/vmx.h
@@ -146,7 +146,6 @@
#define VMX_ABORT_SAVE_GUEST_MSR_FAIL 1
#define VMX_ABORT_LOAD_HOST_PDPTE_FAIL 2
-#define VMX_ABORT_VMCS_CORRUPTED 3
#define VMX_ABORT_LOAD_HOST_MSR_FAIL 4
#endif /* _UAPIVMX_H */
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 92117092f6e9..c17fbe3cc2fb 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -3777,18 +3777,8 @@ static void nested_vmx_restore_host_state(struct kvm_vcpu *vcpu)
vmx_set_cr4(vcpu, vmcs_readl(CR4_READ_SHADOW));
nested_ept_uninit_mmu_context(vcpu);
-
- /*
- * This is only valid if EPT is in use, otherwise the vmcs01 GUEST_CR3
- * points to shadow pages! Fortunately we only get here after a WARN_ON
- * if EPT is disabled, so a VMabort is perfectly fine.
- */
- if (enable_ept) {
- vcpu->arch.cr3 = vmcs_readl(GUEST_CR3);
- __set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail);
- } else {
- nested_vmx_abort(vcpu, VMX_ABORT_VMCS_CORRUPTED);
- }
+ vcpu->arch.cr3 = vmcs_readl(GUEST_CR3);
+ __set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail);
/*
* Use ept_save_pdptrs(vcpu) to load the MMU's cached PDPTRs
@@ -5729,14 +5719,6 @@ __init int nested_vmx_hardware_setup(int (*exit_handlers[])(struct kvm_vcpu *))
{
int i;
- /*
- * Without EPT it is not possible to restore L1's CR3 and PDPTR on
- * VMfail, because they are not available in vmcs01. Just always
- * use hardware checks.
- */
- if (!enable_ept)
- nested_early_check = 1;
-
if (!cpu_has_vmx_shadow_vmcs())
enable_shadow_vmcs = 0;
if (enable_shadow_vmcs) {
--
2.21.0
