[PATCH v3 05/24] KVM: x86: check against irqchip_mode in ioapic_in_kernel()

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



KVM_IRQCHIP_KERNEL implies a fully inititalized ioapic, while
kvm->arch.vioapic might temporarily be set but invalidated again if e.g.
setting of default routing fails when setting KVM_CREATE_IRQCHIP.

Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
---
 arch/x86/kvm/ioapic.h | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kvm/ioapic.h b/arch/x86/kvm/ioapic.h
index 1cc6e54..d88e4b9 100644
--- a/arch/x86/kvm/ioapic.h
+++ b/arch/x86/kvm/ioapic.h
@@ -112,10 +112,11 @@ static inline struct kvm_ioapic *ioapic_irqchip(struct kvm *kvm)
 
 static inline int ioapic_in_kernel(struct kvm *kvm)
 {
-	int ret;
+	int mode = kvm->arch.irqchip_mode;
 
-	ret = (ioapic_irqchip(kvm) != NULL);
-	return ret;
+	/* Matches smp_wmb() when setting irqchip_mode */
+	smp_rmb();
+	return mode == KVM_IRQCHIP_KERNEL;
 }
 
 void kvm_rtc_eoi_tracking_restore_one(struct kvm_vcpu *vcpu);
-- 
2.9.3




[Index of Archives]     [KVM ARM]     [KVM ia64]     [KVM ppc]     [Virtualization Tools]     [Spice Development]     [Libvirt]     [Libvirt Users]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite Questions]     [Linux Kernel]     [Linux SCSI]     [XFree86]

  Powered by Linux