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-rw-r--r--virt/kvm/kvm_main.c70
1 files changed, 54 insertions, 16 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index bf36ae9ae7df..54d25e6f6d2d 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -64,6 +64,9 @@
MODULE_AUTHOR("Qumranet");
MODULE_LICENSE("GPL");
+static int msi2intx = 1;
+module_param(msi2intx, bool, 0);
+
DEFINE_SPINLOCK(kvm_lock);
LIST_HEAD(vm_list);
@@ -250,7 +253,8 @@ 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) {
+ if (!msi2intx &&
+ adev->irq_requested_type & KVM_ASSIGNED_DEV_HOST_MSI) {
free_irq(adev->host_irq, (void *)kvm);
pci_disable_msi(adev->dev);
}
@@ -285,21 +289,33 @@ static int assigned_device_update_msi(struct kvm *kvm,
{
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 (airq->flags & KVM_DEV_IRQ_ASSIGN_ENABLE_MSI) {
+ /* x86 don't care upper address of guest msi message addr */
+ adev->irq_requested_type |= KVM_ASSIGNED_DEV_GUEST_MSI;
+ adev->irq_requested_type &= ~KVM_ASSIGNED_DEV_GUEST_INTX;
+ adev->guest_msi.address_lo = airq->guest_msi.addr_lo;
+ adev->guest_msi.data = airq->guest_msi.data;
+ adev->ack_notifier.gsi = -1;
+ } else if (msi2intx) {
+ adev->irq_requested_type |= KVM_ASSIGNED_DEV_GUEST_INTX;
+ adev->irq_requested_type &= ~KVM_ASSIGNED_DEV_GUEST_MSI;
+ adev->guest_irq = airq->guest_irq;
+ adev->ack_notifier.gsi = airq->guest_irq;
+ }
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;
+ if (!msi2intx) {
+ 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,
@@ -307,8 +323,10 @@ static int assigned_device_update_msi(struct kvm *kvm,
return -EIO;
}
- adev->irq_requested_type = KVM_ASSIGNED_DEV_GUEST_MSI |
- KVM_ASSIGNED_DEV_HOST_MSI;
+ if (!msi2intx)
+ adev->irq_requested_type = KVM_ASSIGNED_DEV_GUEST_MSI;
+
+ adev->irq_requested_type |= KVM_ASSIGNED_DEV_HOST_MSI;
return 0;
}
#endif
@@ -346,10 +364,19 @@ static int kvm_vm_ioctl_assign_irq(struct kvm *kvm,
goto out_release;
else
match->irq_source_id = r;
+
+#ifdef CONFIG_X86
+ /* Determine host device irq type, we can know the
+ * result from dev->msi_enabled */
+ if (msi2intx)
+ pci_enable_msi(match->dev);
+#endif
}
}
- if (assigned_irq->flags & KVM_DEV_IRQ_ASSIGN_ENABLE_MSI) {
+ if ((!msi2intx &&
+ (assigned_irq->flags & KVM_DEV_IRQ_ASSIGN_ENABLE_MSI)) ||
+ (msi2intx && match->dev->msi_enabled)) {
#ifdef CONFIG_X86
r = assigned_device_update_msi(kvm, match, assigned_irq);
if (r) {
@@ -362,8 +389,16 @@ static int kvm_vm_ioctl_assign_irq(struct kvm *kvm,
#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;
+ if (!msi2intx) {
+ printk(KERN_WARNING
+ "kvm: wait device to enable MSI!\n");
+ r = 0;
+ } else {
+ printk(KERN_WARNING
+ "kvm: failed to enable MSI device!\n");
+ r = -ENOTTY;
+ goto out_release;
+ }
} else {
/* Non-sharing INTx mode */
r = assigned_device_update_intx(kvm, match, assigned_irq);
@@ -2209,6 +2244,9 @@ int kvm_init(void *opaque, unsigned int vcpu_size,
kvm_preempt_ops.sched_in = kvm_sched_in;
kvm_preempt_ops.sched_out = kvm_sched_out;
+#ifndef CONFIG_X86
+ msi2intx = 0;
+#endif
return 0;