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authorSheng Yang <sheng@linux.intel.com>2009-01-06 16:25:11 +0800
committerAvi Kivity <avi@redhat.com>2009-03-24 11:03:02 +0200
commit17071fe74fe0fbfdb03cd9b82f2490447cf1f986 (patch)
tree1090267522ecf64960c0745ccf6dca32927e481d /virt
parent67346440e83d2a2f2e9801f370b6240317c7d9bd (diff)
downloadlinux-linaro-stable-17071fe74fe0fbfdb03cd9b82f2490447cf1f986.tar.gz
KVM: Add support to disable MSI for assigned device
MSI is always enabled by default for msi2intx=1. But if msi2intx=0, we have to disable MSI if guest require to do so. The patch also discard unnecessary msi2intx judgment if guest want to update MSI state. Notice KVM_DEV_IRQ_ASSIGN_MSI_ACTION is a mask which should cover all MSI related operations, though we only got one for now. Signed-off-by: Sheng Yang <sheng@linux.intel.com> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/kvm_main.c18
1 files changed, 16 insertions, 2 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index f83ef9c7e89b..04401e17c758 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -343,6 +343,14 @@ static int assigned_device_update_msi(struct kvm *kvm,
adev->irq_requested_type &= ~KVM_ASSIGNED_DEV_GUEST_MSI;
adev->guest_irq = airq->guest_irq;
adev->ack_notifier.gsi = airq->guest_irq;
+ } else {
+ /*
+ * Guest require to disable device MSI, we disable MSI and
+ * re-enable INTx by default again. Notice it's only for
+ * non-msi2intx.
+ */
+ assigned_device_update_intx(kvm, adev, airq);
+ return 0;
}
if (adev->irq_requested_type & KVM_ASSIGNED_DEV_HOST_MSI)
@@ -379,6 +387,7 @@ static int kvm_vm_ioctl_assign_irq(struct kvm *kvm,
{
int r = 0;
struct kvm_assigned_dev_kernel *match;
+ u32 current_flags = 0, changed_flags;
mutex_lock(&kvm->lock);
@@ -416,8 +425,13 @@ static int kvm_vm_ioctl_assign_irq(struct kvm *kvm,
}
}
- if ((!msi2intx &&
- (assigned_irq->flags & KVM_DEV_IRQ_ASSIGN_ENABLE_MSI)) ||
+ if ((match->irq_requested_type & KVM_ASSIGNED_DEV_HOST_MSI) &&
+ (match->irq_requested_type & KVM_ASSIGNED_DEV_GUEST_MSI))
+ current_flags |= KVM_DEV_IRQ_ASSIGN_ENABLE_MSI;
+
+ changed_flags = assigned_irq->flags ^ current_flags;
+
+ if ((changed_flags & KVM_DEV_IRQ_ASSIGN_MSI_ACTION) ||
(msi2intx && match->dev->msi_enabled)) {
#ifdef CONFIG_X86
r = assigned_device_update_msi(kvm, match, assigned_irq);