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| author | Avi Kivity <avi@redhat.com> | 2010-11-01 23:20:48 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2011-01-12 11:29:04 +0200 |
| commit | 30bd0c4c6c5aecc338ebf32e3a6e01c98f0a0b43 (patch) | |
| tree | ddac5485f0a57d25096ee94126d74fc10d3fe85a | |
| parent | 64f638c7c44fa87e65f51eaf0f8302b9cba2d696 (diff) | |
| download | linux-30bd0c4c6c5aecc338ebf32e3a6e01c98f0a0b43.tar.bz2 | |
KVM: VMX: Disallow NMI while blocked by STI
While not mandated by the spec, Linux relies on NMI being blocked by an
IF-enabling STI. VMX also refuses to enter a guest in this state, at
least on some implementations.
Disallow NMI while blocked by STI by checking for the condition, and
requesting an interrupt window exit if it occurs.
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
| -rw-r--r-- | arch/x86/kvm/vmx.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 12c30733e239..8087c4d1a136 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -2787,6 +2787,10 @@ static void enable_nmi_window(struct kvm_vcpu *vcpu) return; } + if (vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & GUEST_INTR_STATE_STI) { + enable_irq_window(vcpu); + return; + } cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL); cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_NMI_PENDING; vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control); @@ -2849,7 +2853,8 @@ static int vmx_nmi_allowed(struct kvm_vcpu *vcpu) return 0; return !(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & - (GUEST_INTR_STATE_MOV_SS | GUEST_INTR_STATE_NMI)); + (GUEST_INTR_STATE_MOV_SS | GUEST_INTR_STATE_STI + | GUEST_INTR_STATE_NMI)); } static bool vmx_get_nmi_mask(struct kvm_vcpu *vcpu) |