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From:   Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
To:     <linux-kernel@vger.kernel.org>, <kvm@vger.kernel.org>
CC:     <pbonzini@redhat.com>, <mlevitsk@redhat.com>, <seanjc@google.com>,
        <joro@8bytes.org>, <jon.grimm@amd.com>, <wei.huang2@amd.com>,
        <terry.bowman@amd.com>,
        Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>,
        Pankaj Gupta <pankaj.gupta@amd.com>
Subject: [PATCH v6 12/17] KVM: SVM: Do not throw warning when calling avic_vcpu_load on a running vcpu
Date:   Thu, 19 May 2022 05:27:04 -0500
Message-ID: <20220519102709.24125-13-suravee.suthikulpanit@amd.com>
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Originalliy, this WARN_ON is designed to detect when calling
avic_vcpu_load() on an already running vcpu in AVIC mode (i.e. the AVIC
is_running bit is set).

However, for x2AVIC, the vCPU can switch from xAPIC to x2APIC mode while in
running state, in which the avic_vcpu_load() will be called from
svm_refresh_apicv_exec_ctrl().

Therefore, remove this warning since it is no longer appropriate.

Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Reviewed-by: Pankaj Gupta <pankaj.gupta@amd.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
---
 arch/x86/kvm/svm/avic.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c
index d40170082716..2d9455338b1f 100644
--- a/arch/x86/kvm/svm/avic.c
+++ b/arch/x86/kvm/svm/avic.c
@@ -1038,7 +1038,6 @@ void __avic_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 		return;
 
 	entry = READ_ONCE(*(svm->avic_physical_id_cache));
-	WARN_ON(entry & AVIC_PHYSICAL_ID_ENTRY_IS_RUNNING_MASK);
 
 	entry &= ~AVIC_PHYSICAL_ID_ENTRY_HOST_PHYSICAL_ID_MASK;
 	entry |= (h_physical_id & AVIC_PHYSICAL_ID_ENTRY_HOST_PHYSICAL_ID_MASK);
-- 
2.25.1