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KVM: SVM: allocate AVIC data structures based on kvm_amd module parameter

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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>
This commit is contained in:
Paolo Bonzini 2020-02-25 08:54:26 +01:00
parent a93236fcbe
commit 7943f4acea
1 changed files with 2 additions and 1 deletions
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3
arch/x86/kvm/svm.c
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@ -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);