From 7943f4acea3caf0b6d5b6cdfce7d5a2b4a9aa608 Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Tue, 25 Feb 2020 08:54:26 +0100
Subject: [PATCH] KVM: SVM: allocate AVIC data structures based on kvm_amd
module parameter
Even if APICv is disabled at startup, the backing page and ir_list need
to be initialized in case they are needed later. The only case in
which this can be skipped is for userspace irqchip, and that must be
done because avic_init_backing_page dereferences vcpu->arch.apic
(which is NULL for userspace irqchip).
Tested-by: rmuncrief@humanavance.com
Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=206579
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
arch/x86/kvm/svm.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index ad3f5b178a03e..bd02526300ab3 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -2194,8 +2194,9 @@ static void svm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
static int avic_init_vcpu(struct vcpu_svm *svm)
{
int ret;
+ struct kvm_vcpu *vcpu = &svm->vcpu;
- if (!kvm_vcpu_apicv_active(&svm->vcpu))
+ if (!avic || !irqchip_in_kernel(vcpu->kvm))
return 0;
ret = avic_init_backing_page(&svm->vcpu);
--
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