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authorMark McLoughlin <markmc@redhat.com>2008-12-02 12:16:33 +0000
committerAvi Kivity <avi@redhat.com>2008-12-31 16:55:47 +0200
commitdefaf1587c5d7dff828f6f11c8941e5bcef00f50 (patch)
treefe4bcf162e203ee80916a5d168d838ef8aa62d25 /include/linux/kvm_host.h
parenteb64f1e8cd5c3cae912db30a77d062367f7a11a6 (diff)
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KVM: fix handling of ACK from shared guest IRQ
If an assigned device shares a guest irq with an emulated device then we currently interpret an ack generated by the emulated device as originating from the assigned device leading to e.g. "Unbalanced enable for IRQ 4347" from the enable_irq() in kvm_assigned_dev_ack_irq(). The fix is fairly simple - don't enable the physical device irq unless it was previously disabled. Of course, this can still lead to a situation where a non-assigned device ACK can cause the physical device irq to be reenabled before the device was serviced. However, being level sensitive, the interrupt will merely be regenerated. Signed-off-by: Mark McLoughlin <markmc@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'include/linux/kvm_host.h')
-rw-r--r--include/linux/kvm_host.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 8091a4d..eafabd5 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -307,6 +307,7 @@ struct kvm_assigned_dev_kernel {
int host_busnr;
int host_devfn;
int host_irq;
+ bool host_irq_disabled;
int guest_irq;
struct msi_msg guest_msi;
#define KVM_ASSIGNED_DEV_GUEST_INTX (1 << 0)
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