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

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Message-ID: <20241121185315.3416855-9-mizhang@google.com>
Date: Thu, 21 Nov 2024 18:53:00 +0000
From: Mingwei Zhang <mizhang@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>, 
	Huang Rui <ray.huang@....com>, "Gautham R. Shenoy" <gautham.shenoy@....com>, 
	Mario Limonciello <mario.limonciello@....com>, "Rafael J. Wysocki" <rafael@...nel.org>, 
	Viresh Kumar <viresh.kumar@...aro.org>, 
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>, Len Brown <lenb@...nel.org>
Cc: "H. Peter Anvin" <hpa@...or.com>, Perry Yuan <perry.yuan@....com>, kvm@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org, 
	Jim Mattson <jmattson@...gle.com>, Mingwei Zhang <mizhang@...gle.com>
Subject: [RFC PATCH 08/22] KVM: nVMX: Nested VM-exit may transition from
 HALTED to RUNNABLE

From: Jim Mattson <jmattson@...gle.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@...gle.com>
---
 arch/x86/kvm/vmx/nested.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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)
-- 
2.47.0.371.ga323438b13-goog