From 58476d1b47961f0ec6abe15f16ec8c160d402522 Mon Sep 17 00:00:00 2001
From: Chen Qun <kuhn.chenqun@huawei.com>
Date: Thu, 13 Dec 2018 10:57:53 -0500
Subject: [PATCH] vfio/pci: Set up the DMA FAULT region

Set up the fault region which is composed of the actual fault
queue (mmappable) and a header used to handle it. The fault
queue is mmapped.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Kunkun Jiang <jiangkunkun@huawei.com>
---
 vfio-pci-Set-up-the-DMA-FAULT-region.patch | 132 +++++++++++++++++++++
 1 file changed, 132 insertions(+)
 create mode 100644 vfio-pci-Set-up-the-DMA-FAULT-region.patch

diff --git a/vfio-pci-Set-up-the-DMA-FAULT-region.patch b/vfio-pci-Set-up-the-DMA-FAULT-region.patch
new file mode 100644
index 0000000..ae70a06
--- /dev/null
+++ b/vfio-pci-Set-up-the-DMA-FAULT-region.patch
@@ -0,0 +1,132 @@
+From e44d9cc377848f0a560b6d114561852e95fab557 Mon Sep 17 00:00:00 2001
+From: Eric Auger <eric.auger@redhat.com>
+Date: Thu, 13 Dec 2018 10:57:53 -0500
+Subject: [PATCH] vfio/pci: Set up the DMA FAULT region
+
+Set up the fault region which is composed of the actual fault
+queue (mmappable) and a header used to handle it. The fault
+queue is mmapped.
+
+Signed-off-by: Eric Auger <eric.auger@redhat.com>
+Signed-off-by: Kunkun Jiang <jiangkunkun@huawei.com>
+---
+ hw/vfio/pci.c | 64 +++++++++++++++++++++++++++++++++++++++++++++++++++
+ hw/vfio/pci.h |  1 +
+ 2 files changed, 65 insertions(+)
+
+diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
+index f5c05d508d..0db7d68258 100644
+--- a/hw/vfio/pci.c
++++ b/hw/vfio/pci.c
+@@ -2607,11 +2607,67 @@ int vfio_populate_vga(VFIOPCIDevice *vdev, Error **errp)
+     return 0;
+ }
+ 
++static void vfio_init_fault_regions(VFIOPCIDevice *vdev, Error **errp)
++{
++    struct vfio_region_info *fault_region_info = NULL;
++    struct vfio_region_info_cap_fault *cap_fault;
++    VFIODevice *vbasedev = &vdev->vbasedev;
++    struct vfio_info_cap_header *hdr;
++    char *fault_region_name;
++    int ret;
++
++    ret = vfio_get_dev_region_info(&vdev->vbasedev,
++                                   VFIO_REGION_TYPE_NESTED,
++                                   VFIO_REGION_SUBTYPE_NESTED_DMA_FAULT,
++                                   &fault_region_info);
++    if (ret) {
++        goto out;
++    }
++
++    hdr = vfio_get_region_info_cap(fault_region_info,
++                                   VFIO_REGION_INFO_CAP_DMA_FAULT);
++    if (!hdr) {
++        error_setg(errp, "failed to retrieve DMA FAULT capability");
++        goto out;
++    }
++    cap_fault = container_of(hdr, struct vfio_region_info_cap_fault,
++                             header);
++    if (cap_fault->version != 1) {
++        error_setg(errp, "Unsupported DMA FAULT API version %d",
++                   cap_fault->version);
++        goto out;
++    }
++
++    fault_region_name = g_strdup_printf("%s DMA FAULT %d",
++                                        vbasedev->name,
++                                        fault_region_info->index);
++
++    ret = vfio_region_setup(OBJECT(vdev), vbasedev,
++                            &vdev->dma_fault_region,
++                            fault_region_info->index,
++                            fault_region_name);
++    g_free(fault_region_name);
++    if (ret) {
++        error_setg_errno(errp, -ret,
++                         "failed to set up the DMA FAULT region %d",
++                         fault_region_info->index);
++        goto out;
++    }
++
++    ret = vfio_region_mmap(&vdev->dma_fault_region);
++    if (ret) {
++        error_setg_errno(errp, -ret, "Failed to mmap the DMA FAULT queue");
++    }
++out:
++    g_free(fault_region_info);
++}
++
+ static void vfio_populate_device(VFIOPCIDevice *vdev, Error **errp)
+ {
+     VFIODevice *vbasedev = &vdev->vbasedev;
+     struct vfio_region_info *reg_info;
+     struct vfio_irq_info irq_info = { .argsz = sizeof(irq_info) };
++    Error *err = NULL;
+     int i, ret = -1;
+ 
+     /* Sanity check device */
+@@ -2675,6 +2731,12 @@ static void vfio_populate_device(VFIOPCIDevice *vdev, Error **errp)
+         }
+     }
+ 
++    vfio_init_fault_regions(vdev, &err);
++    if (err) {
++        error_propagate(errp, err);
++        return;
++    }
++
+     irq_info.index = VFIO_PCI_ERR_IRQ_INDEX;
+ 
+     ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_GET_IRQ_INFO, &irq_info);
+@@ -3260,6 +3322,7 @@ static void vfio_instance_finalize(Object *obj)
+ 
+     vfio_display_finalize(vdev);
+     vfio_bars_finalize(vdev);
++    vfio_region_finalize(&vdev->dma_fault_region);
+     g_free(vdev->emulated_config_bits);
+     g_free(vdev->rom);
+     /*
+@@ -3280,6 +3343,7 @@ static void vfio_exitfn(PCIDevice *pdev)
+     vfio_unregister_req_notifier(vdev);
+     vfio_unregister_err_notifier(vdev);
+     vfio_unregister_ext_irq_notifiers(vdev);
++    vfio_region_exit(&vdev->dma_fault_region);
+     pci_device_set_intx_routing_notifier(&vdev->pdev, NULL);
+     vfio_disable_interrupts(vdev);
+     if (vdev->intx.mmap_timer) {
+diff --git a/hw/vfio/pci.h b/hw/vfio/pci.h
+index 893d074375..815154656c 100644
+--- a/hw/vfio/pci.h
++++ b/hw/vfio/pci.h
+@@ -141,6 +141,7 @@ typedef struct VFIOPCIDevice {
+     EventNotifier err_notifier;
+     EventNotifier req_notifier;
+     VFIOPCIExtIRQ *ext_irqs;
++    VFIORegion dma_fault_region;
+     int (*resetfn)(struct VFIOPCIDevice *);
+     uint32_t vendor_id;
+     uint32_t device_id;
+-- 
+2.27.0
+