[ Upstream commit 9ebdfe5230f2e50e3ba05c57723a06e90946815a ]
According to the SDM, "NMI-window exiting" VM-exits wake a logical
processor from the same inactive states as would an NMI and
"interrupt-window exiting" VM-exits wake a logical processor from the
same inactive states as would an external interrupt. Specifically, they
wake a logical processor from the shutdown state and from the states
entered using the HLT and MWAIT instructions.
Fixes: 6dfacadd5858 ("KVM: nVMX: Add support for activity state HLT")
Signed-off-by: Jim Mattson <jmatt...@google.com>
Reviewed-by: Peter Shier <psh...@google.com>
Suggested-by: Sean Christopherson <sean.j.christopher...@intel.com>
[Squashed comments of two Jim's patches and used the simplified code
hunk provided by Sean. - Radim]
Signed-off-by: Radim Krčmář <rkrc...@redhat.com>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
arch/x86/kvm/vmx.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index f99f59625da5..e61ac229a6c1 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -12836,11 +12836,15 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool
launch)
nested_cache_shadow_vmcs12(vcpu, vmcs12);
/*
- * If we're entering a halted L2 vcpu and the L2 vcpu won't be woken
- * by event injection, halt vcpu.
+ * If we're entering a halted L2 vcpu and the L2 vcpu won't be
+ * awakened by event injection or by an NMI-window VM-exit or
+ * by an interrupt-window VM-exit, halt the vcpu.
*/
if ((vmcs12->guest_activity_state == GUEST_ACTIVITY_HLT) &&
- !(vmcs12->vm_entry_intr_info_field & INTR_INFO_VALID_MASK)) {
+ !(vmcs12->vm_entry_intr_info_field & INTR_INFO_VALID_MASK) &&
+ !(vmcs12->cpu_based_vm_exec_control &
CPU_BASED_VIRTUAL_NMI_PENDING) &&
+ !((vmcs12->cpu_based_vm_exec_control &
CPU_BASED_VIRTUAL_INTR_PENDING) &&
+ (vmcs12->guest_rflags & X86_EFLAGS_IF))) {
vmx->nested.nested_run_pending = 0;
return kvm_vcpu_halt(vcpu);
}
--
2.19.1
