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KVM: x86: clear SMM flags before loading state while leaving SMM

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RSM emulation is currently broken on VMX when the interrupted guest has
CR4.VMXE=1.  Stop dancing around the issue of HF_SMM_MASK being set when
loading SMSTATE into architectural state, e.g. by toggling it for
problematic flows, and simply clear HF_SMM_MASK prior to loading
architectural state (from SMRAM save state area).

Reported-by: Jon Doron <arilou@gmail.com>
Cc: Jim Mattson <jmattson@google.com>
Cc: Liran Alon <liran.alon@oracle.com>
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
Fixes: 5bea5123cb ("KVM: VMX: check nested state and CR4.VMXE against SMM")
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Tested-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson
2019-04-02 08:03:11 -07:00
committed by Paolo Bonzini
parent c5833c7a43
commit 9ec19493fb
3 changed files with 10 additions and 16 deletions
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2
arch/x86/kvm/vmx/vmx.c
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@@ -7409,9 +7409,7 @@ static int vmx_pre_leave_smm(struct kvm_vcpu *vcpu, const char *smstate)
}
if (vmx->nested.smm.guest_mode) {
vcpu->arch.hflags &= ~HF_SMM_MASK;
ret = nested_vmx_enter_non_root_mode(vcpu, false);
vcpu->arch.hflags |= HF_SMM_MASK;
if (ret)
return ret;