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.
Signed-off-by: Sheng Yang <[EMAIL PROTECTED]> --- virt/kvm/kvm_main.c | 80 +++++++++++++++++++++++++++++++++++++++++++++++---- 1 files changed, 74 insertions(+), 6 deletions(-) diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index d23f555..3ae8653 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); @@ -240,6 +248,11 @@ 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; @@ -263,6 +276,40 @@ 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; + + adev->guest_msi_addr = airq->guest_msi_addr; + 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) @@ -299,9 +346,30 @@ 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; -- 1.5.4.5 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html