[PATCH] KVM: move alloc_apic_access_page() outside of non-preemptable region

[PATCH] KVM: move alloc_apic_access_page() outside of non-preemptable region

[Marcelo Tosatti]

alloc_apic_access_page() can sleep, while vmx_vcpu_setup is called
inside a non preemptable region. Move it after put_cpu().

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

Index: linux-2.6-x86-kvm/arch/x86/kvm/vmx.c
===================================================================
--- linux-2.6-x86-kvm.orig/arch/x86/kvm/vmx.c
+++ linux-2.6-x86-kvm/arch/x86/kvm/vmx.c
@@ -1601,9 +1601,6 @@ static int vmx_vcpu_setup(struct vcpu_vm
 	vmcs_writel(CR0_GUEST_HOST_MASK, ~0UL);
 	vmcs_writel(CR4_GUEST_HOST_MASK, KVM_GUEST_CR4_MASK);
 
-	if (vm_need_virtualize_apic_accesses(vmx->vcpu.kvm))
-		if (alloc_apic_access_page(vmx->vcpu.kvm) != 0)
-			return -ENOMEM;
 
 	return 0;
 }
@@ -2533,6 +2530,9 @@ static struct kvm_vcpu *vmx_create_vcpu(
 	put_cpu();
 	if (err)
 		goto free_vmcs;
+	if (vm_need_virtualize_apic_accesses(kvm))
+		if (alloc_apic_access_page(kvm) != 0)
+			goto free_vmcs;
 
 	return &vmx->vcpu;
 

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Re: [PATCH] KVM: move alloc_apic_access_page() outside of non-preemptable region

[Avi Kivity]

Marcelo Tosatti wrote:
> alloc_apic_access_page() can sleep, while vmx_vcpu_setup is called
> inside a non preemptable region. Move it after put_cpu().
>
>   

Applied, thanks.

-- 
Any sufficiently difficult bug is indistinguishable from a feature.


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