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| author | Sean Christopherson <sean.j.christopherson@intel.com> | 2019-04-02 17:03:11 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2019-04-16 15:37:36 +0200 |
| commit | 9ec19493fb86d6d5fbf9286b94ff21e56ef66376 (patch) | |
| tree | 3de9d350da3033b6ba31a107b6b05cc73cbdafa8 /arch/x86/kvm/svm.c | |
| parent | KVM: x86: Open code kvm_set_hflags (diff) | |
| download | linux-9ec19493fb86d6d5fbf9286b94ff21e56ef66376.tar.xz linux-9ec19493fb86d6d5fbf9286b94ff21e56ef66376.zip | |
KVM: x86: clear SMM flags before loading state while leaving SMM
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: 5bea5123cbf0 ("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>
Diffstat (limited to 'arch/x86/kvm/svm.c')
| -rw-r--r-- | arch/x86/kvm/svm.c | 12 |
1 files changed, 4 insertions, 8 deletions
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 6b1cd73e4053..406b558abfef 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -6239,21 +6239,17 @@ static int svm_pre_leave_smm(struct kvm_vcpu *vcpu, const char *smstate) struct page *page; u64 guest; u64 vmcb; - int ret; guest = GET_SMSTATE(u64, smstate, 0x7ed8); vmcb = GET_SMSTATE(u64, smstate, 0x7ee0); if (guest) { - vcpu->arch.hflags &= ~HF_SMM_MASK; nested_vmcb = nested_svm_map(svm, vmcb, &page); - if (nested_vmcb) - enter_svm_guest_mode(svm, vmcb, nested_vmcb, page); - else - ret = 1; - vcpu->arch.hflags |= HF_SMM_MASK; + if (!nested_vmcb) + return 1; + enter_svm_guest_mode(svm, vmcb, nested_vmcb, page); } - return ret; + return 0; } static int enable_smi_window(struct kvm_vcpu *vcpu) |