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kvm: nVMX: NMI-window and interrupt-window exiting should wake L2 from HLT

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[ Upstream commit 9ebdfe5230 ]

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: 6dfacadd58 ("KVM: nVMX: Add support for activity state HLT")
Signed-off-by: Jim Mattson <jmattson@google.com>
Reviewed-by: Peter Shier <pshier@google.com>
Suggested-by: Sean Christopherson <sean.j.christopherson@intel.com>
[Squashed comments of two Jim's patches and used the simplified code
 hunk provided by Sean. - Radim]
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jim Mattson
2018-11-26 11:22:32 -08:00
committed by Greg Kroah-Hartman
parent 4d552acf33
commit 646f8e01fc
1 changed files with 7 additions and 3 deletions
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10
arch/x86/kvm/vmx.c
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@@ -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);
}