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[RFC,08/22] KVM: nVMX: Nested VM-exit may transition from HALTED to RUNNABLE

Message ID 20241121185315.3416855-9-mizhang@google.com (mailing list archive)
State New
Headers show
Series KVM: x86: Virtualize IA32_APERF and IA32_MPERF MSRs | expand

Commit Message

Mingwei Zhang Nov. 21, 2024, 6:53 p.m. UTC 
From: Jim Mattson <jmattson@google.com>

When a halted vCPU is awakened by a nested event, it might have been
the target of a previous KVM_HC_KICK_CPU hypercall, in which case
pv_unhalted would be set. This flag should be cleared before the next
HLT instruction, as kvm_vcpu_has_events() would otherwise return true
and prevent the vCPU from entering the halt state.

Use kvm_vcpu_make_runnable() to ensure consistent handling of the
HALTED to RUNNABLE state transition.

Fixes: b6b8a1451fc4 ("KVM: nVMX: Rework interception of IRQs and NMIs")
Signed-off-by: Jim Mattson <jmattson@google.com>
---
 arch/x86/kvm/vmx/nested.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 931a7361c30f2..202eacfd87036 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -5048,7 +5048,7 @@  void nested_vmx_vmexit(struct kvm_vcpu *vcpu, u32 vm_exit_reason,
 		vmx->nested.need_vmcs12_to_shadow_sync = true;
 
 	/* in case we halted in L2 */
-	vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
+	kvm_vcpu_make_runnable(vcpu);
 
 	if (likely(!vmx->fail)) {
 		if (vm_exit_reason != -1)