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authorSheng Yang <sheng@linux.intel.com>2008-11-24 14:32:56 +0800
committerAvi Kivity <avi@redhat.com>2008-12-31 16:55:02 +0200
commit6b9cc7fd469869bed38831c5adac3f59dc25eaf5 (patch)
tree63d526ff94b891116c37bf9705e42a45479271f0 /virt
parentf64769eb05565c74d7fce6fa75d65924f9cdaf79 (diff)
downloadlinux-6b9cc7fd469869bed38831c5adac3f59dc25eaf5.tar.gz
KVM: Enable MSI for device assignment
We enable guest MSI and host MSI support in this patch. The userspace want to enable MSI should set KVM_DEV_IRQ_ASSIGN_ENABLE_MSI in the assigned_irq's flag. Function would return -ENOTTY if can't enable MSI, userspace shouldn't set MSI Enable bit when KVM_ASSIGN_IRQ return -ENOTTY with KVM_DEV_IRQ_ASSIGN_ENABLE_MSI. Userspace can tell the support of MSI device from #ifdef KVM_CAP_DEVICE_MSI. 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.c81
1 files changed, 75 insertions, 6 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 228c1d18a61..bf36ae9ae7d 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -159,9 +159,15 @@ static void kvm_assigned_dev_interrupt_work_handler(struct work_struct *work)
* finer-grained lock, update this
*/
mutex_lock(&assigned_dev->kvm->lock);
- kvm_set_irq(assigned_dev->kvm,
- assigned_dev->irq_source_id,
- assigned_dev->guest_irq, 1);
+ if (assigned_dev->irq_requested_type & KVM_ASSIGNED_DEV_GUEST_INTX)
+ kvm_set_irq(assigned_dev->kvm,
+ assigned_dev->irq_source_id,
+ assigned_dev->guest_irq, 1);
+ else if (assigned_dev->irq_requested_type &
+ KVM_ASSIGNED_DEV_GUEST_MSI) {
+ assigned_device_msi_dispatch(assigned_dev);
+ enable_irq(assigned_dev->host_irq);
+ }
mutex_unlock(&assigned_dev->kvm->lock);
kvm_put_kvm(assigned_dev->kvm);
}
@@ -197,6 +203,8 @@ static void kvm_free_assigned_device(struct kvm *kvm,
{
if (irqchip_in_kernel(kvm) && assigned_dev->irq_requested_type)
free_irq(assigned_dev->host_irq, (void *)assigned_dev);
+ if (assigned_dev->irq_requested_type & KVM_ASSIGNED_DEV_HOST_MSI)
+ pci_disable_msi(assigned_dev->dev);
kvm_unregister_irq_ack_notifier(&assigned_dev->ack_notifier);
kvm_free_irq_source_id(kvm, assigned_dev->irq_source_id);
@@ -242,6 +250,11 @@ static int assigned_device_update_intx(struct kvm *kvm,
return 0;
if (irqchip_in_kernel(kvm)) {
+ if (adev->irq_requested_type & KVM_ASSIGNED_DEV_HOST_MSI) {
+ free_irq(adev->host_irq, (void *)kvm);
+ pci_disable_msi(adev->dev);
+ }
+
if (!capable(CAP_SYS_RAWIO))
return -EPERM;
@@ -265,6 +278,41 @@ static int assigned_device_update_intx(struct kvm *kvm,
return 0;
}
+#ifdef CONFIG_X86
+static int assigned_device_update_msi(struct kvm *kvm,
+ struct kvm_assigned_dev_kernel *adev,
+ struct kvm_assigned_irq *airq)
+{
+ int r;
+
+ /* x86 don't care upper address of guest msi message addr */
+ adev->guest_msi.address_lo = airq->guest_msi.addr_lo;
+ adev->guest_msi.data = airq->guest_msi.data;
+ adev->ack_notifier.gsi = -1;
+
+ if (adev->irq_requested_type & KVM_ASSIGNED_DEV_HOST_MSI)
+ return 0;
+
+ if (irqchip_in_kernel(kvm)) {
+ if (adev->irq_requested_type & KVM_ASSIGNED_DEV_HOST_INTX)
+ free_irq(adev->host_irq, (void *)adev);
+
+ r = pci_enable_msi(adev->dev);
+ if (r)
+ return r;
+
+ adev->host_irq = adev->dev->irq;
+ if (request_irq(adev->host_irq, kvm_assigned_dev_intr, 0,
+ "kvm_assigned_msi_device", (void *)adev))
+ return -EIO;
+ }
+
+ adev->irq_requested_type = KVM_ASSIGNED_DEV_GUEST_MSI |
+ KVM_ASSIGNED_DEV_HOST_MSI;
+ return 0;
+}
+#endif
+
static int kvm_vm_ioctl_assign_irq(struct kvm *kvm,
struct kvm_assigned_irq
*assigned_irq)
@@ -301,9 +349,30 @@ static int kvm_vm_ioctl_assign_irq(struct kvm *kvm,
}
}
- r = assigned_device_update_intx(kvm, match, assigned_irq);
- if (r)
- goto out_release;
+ if (assigned_irq->flags & KVM_DEV_IRQ_ASSIGN_ENABLE_MSI) {
+#ifdef CONFIG_X86
+ r = assigned_device_update_msi(kvm, match, assigned_irq);
+ if (r) {
+ printk(KERN_WARNING "kvm: failed to enable "
+ "MSI device!\n");
+ goto out_release;
+ }
+#else
+ r = -ENOTTY;
+#endif
+ } else if (assigned_irq->host_irq == 0 && match->dev->irq == 0) {
+ /* Host device IRQ 0 means don't support INTx */
+ printk(KERN_WARNING "kvm: wait device to enable MSI!\n");
+ r = 0;
+ } else {
+ /* Non-sharing INTx mode */
+ r = assigned_device_update_intx(kvm, match, assigned_irq);
+ if (r) {
+ printk(KERN_WARNING "kvm: failed to enable "
+ "INTx device!\n");
+ goto out_release;
+ }
+ }
mutex_unlock(&kvm->lock);
return r;