diff options
Diffstat (limited to 'virt')
| -rw-r--r-- | virt/kvm/kvm_main.c | 70 |
1 files changed, 54 insertions, 16 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index bf36ae9ae7d..54d25e6f6d2 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; |