Commit 9ebdfe52 authored Nov 26, 2018 by Jim Mattson Committed by Paolo Bonzini Dec 21, 2018

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



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: 6dfacadd ("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>

parent e081354d

arch/x86/kvm/vmx/nested.c

+7 −3

Original line number	Diff line number	Diff line
		@@ -3156,11 +3156,15 @@ 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);
		}

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