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[Qemu-devel] [RFC v3 27/27] vfio-pci: Implement the DMA fault handler
From: |
Eric Auger |
Subject: |
[Qemu-devel] [RFC v3 27/27] vfio-pci: Implement the DMA fault handler |
Date: |
Fri, 12 Apr 2019 12:03:54 +0200 |
Whenever the eventfd is triggered, we retrieve the DMA faults
from the mmapped fault region and inject them in the iommu
memory region.
Signed-off-by: Eric Auger <address@hidden>
---
hw/vfio/pci.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++
hw/vfio/pci.h | 1 +
2 files changed, 54 insertions(+)
diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index 89399a290f..fcbb92cf27 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -2820,10 +2820,63 @@ static void vfio_unregister_req_notifier(VFIOPCIDevice
*vdev)
static void vfio_dma_fault_notifier_handler(void *opaque)
{
VFIOPCIDevice *vdev = opaque;
+ PCIDevice *pdev = &vdev->pdev;
+ AddressSpace *as = pci_device_iommu_address_space(pdev);
+ IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(as->root);
+ struct vfio_region_fault_prod header;
+ struct iommu_fault *queue;
+ char *queue_buffer = NULL;
+ ssize_t bytes;
if (!event_notifier_test_and_clear(&vdev->dma_fault_notifier)) {
return;
}
+
+ if (!vdev->fault_prod_region.size || !vdev->fault_cons_region.size) {
+ return;
+ }
+
+ bytes = pread(vdev->vbasedev.fd, &header, sizeof(header),
+ vdev->fault_prod_region.fd_offset);
+ if (bytes != sizeof(header)) {
+ error_report("%s unable to read the fault region header (0x%lx)",
+ __func__, bytes);
+ return;
+ }
+
+ /* Normally the fault queue is mmapped */
+ queue = (struct iommu_fault *)vdev->fault_prod_region.mmaps[0].mmap;
+ if (!queue) {
+ size_t queue_size = header.nb_entries * header.entry_size;
+
+ error_report("%s: fault queue not mmapped: slower fault handling",
+ vdev->vbasedev.name);
+
+ queue_buffer = g_malloc(queue_size);
+ bytes = pread(vdev->vbasedev.fd, queue_buffer, queue_size,
+ vdev->fault_prod_region.fd_offset + header.offset);
+ if (bytes != queue_size) {
+ error_report("%s unable to read the fault queue (0x%lx)",
+ __func__, bytes);
+ return;
+ }
+
+ queue = (struct iommu_fault *)queue_buffer;
+ }
+
+ while (vdev->fault_cons_index != header.prod) {
+ memory_region_inject_faults(iommu_mr, 1,
+ &queue[vdev->fault_cons_index]);
+ vdev->fault_cons_index =
+ (vdev->fault_cons_index + 1) % header.nb_entries;
+ }
+ bytes = pwrite(vdev->vbasedev.fd, &vdev->fault_cons_index, 4,
+ vdev->fault_cons_region.fd_offset + 4);
+ if (bytes != 4) {
+ error_report("%s unable to write the fault region cons index (0x%lx)",
+ __func__, bytes);
+ }
+ g_free(queue_buffer);
}
static void vfio_register_dma_fault_notifier(VFIOPCIDevice *vdev)
diff --git a/hw/vfio/pci.h b/hw/vfio/pci.h
index 24ec43ac81..aef69c4487 100644
--- a/hw/vfio/pci.h
+++ b/hw/vfio/pci.h
@@ -138,6 +138,7 @@ typedef struct VFIOPCIDevice {
EventNotifier dma_fault_notifier;
VFIORegion fault_prod_region;
VFIORegion fault_cons_region;
+ uint32_t fault_cons_index;
int (*resetfn)(struct VFIOPCIDevice *);
uint32_t vendor_id;
uint32_t device_id;
--
2.20.1
- [Qemu-devel] [RFC v3 17/27] hw/vfio/common: Introduce vfio_alloc_guest_iommu helper, (continued)
- [Qemu-devel] [RFC v3 17/27] hw/vfio/common: Introduce vfio_alloc_guest_iommu helper, Eric Auger, 2019/04/12
- [Qemu-devel] [RFC v3 18/27] hw/vfio/common: Introduce hostwin_from_range helper, Eric Auger, 2019/04/12
- [Qemu-devel] [RFC v3 19/27] hw/vfio/common: Introduce helpers to DMA map/unap a RAM section, Eric Auger, 2019/04/12
- [Qemu-devel] [RFC v3 20/27] hw/vfio/common: Setup nested stage mappings, Eric Auger, 2019/04/12
- [Qemu-devel] [RFC v3 21/27] hw/vfio/common: Register a MAP notifier for MSI binding, Eric Auger, 2019/04/12
- [Qemu-devel] [RFC v3 22/27] vfio-pci: Expose MSI stage 1 bindings to the host, Eric Auger, 2019/04/12
- [Qemu-devel] [RFC v3 23/27] memory: Introduce IOMMU Memory Region inject_faults API, Eric Auger, 2019/04/12
- [Qemu-devel] [RFC v3 24/27] hw/arm/smmuv3: Implement fault injection, Eric Auger, 2019/04/12
- [Qemu-devel] [RFC v3 25/27] vfio-pci: register handler for iommu fault, Eric Auger, 2019/04/12
- [Qemu-devel] [RFC v3 26/27] vfio-pci: Set up fault regions, Eric Auger, 2019/04/12
- [Qemu-devel] [RFC v3 27/27] vfio-pci: Implement the DMA fault handler,
Eric Auger <=
- Re: [Qemu-devel] [RFC v3 00/27] vSMMUv3/pSMMUv3 2 stage VFIO integration, no-reply, 2019/04/12