97 lines
3.3 KiB
Diff
97 lines
3.3 KiB
Diff
From d33cc7eccb68c6a1488804c94ff5c1197ee0fc6e Mon Sep 17 00:00:00 2001
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From: Eric Auger <eric.auger@redhat.com>
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Date: Tue, 5 Mar 2019 16:35:32 +0100
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Subject: [PATCH] vfio/pci: Implement the DMA fault handler
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Whenever the eventfd is triggered, we retrieve the DMA fault(s)
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from the mmapped fault region and inject them in the iommu
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memory region.
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Signed-off-by: Eric Auger <eric.auger@redhat.com>
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Signed-off-by: Kunkun Jiang <jiangkunkun@huawei.com>
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---
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hw/vfio/pci.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
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hw/vfio/pci.h | 1 +
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2 files changed, 51 insertions(+)
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diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
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index 76bc9d3506..c54e62fe8f 100644
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--- a/hw/vfio/pci.c
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+++ b/hw/vfio/pci.c
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@@ -2953,10 +2953,60 @@ static PCIPASIDOps vfio_pci_pasid_ops = {
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static void vfio_dma_fault_notifier_handler(void *opaque)
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{
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VFIOPCIExtIRQ *ext_irq = opaque;
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+ VFIOPCIDevice *vdev = ext_irq->vdev;
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+ PCIDevice *pdev = &vdev->pdev;
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+ AddressSpace *as = pci_device_iommu_address_space(pdev);
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+ IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(as->root);
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+ struct vfio_region_dma_fault header;
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+ struct iommu_fault *queue;
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+ char *queue_buffer = NULL;
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+ ssize_t bytes;
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if (!event_notifier_test_and_clear(&ext_irq->notifier)) {
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return;
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}
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+
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+ bytes = pread(vdev->vbasedev.fd, &header, sizeof(header),
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+ vdev->dma_fault_region.fd_offset);
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+ if (bytes != sizeof(header)) {
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+ error_report("%s unable to read the fault region header (0x%lx)",
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+ __func__, bytes);
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+ return;
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+ }
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+
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+ /* Normally the fault queue is mmapped */
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+ queue = (struct iommu_fault *)vdev->dma_fault_region.mmaps[0].mmap;
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+ if (!queue) {
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+ size_t queue_size = header.nb_entries * header.entry_size;
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+
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+ error_report("%s: fault queue not mmapped: slower fault handling",
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+ vdev->vbasedev.name);
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+
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+ queue_buffer = g_malloc(queue_size);
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+ bytes = pread(vdev->vbasedev.fd, queue_buffer, queue_size,
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+ vdev->dma_fault_region.fd_offset + header.offset);
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+ if (bytes != queue_size) {
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+ error_report("%s unable to read the fault queue (0x%lx)",
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+ __func__, bytes);
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+ return;
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+ }
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+
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+ queue = (struct iommu_fault *)queue_buffer;
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+ }
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+
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+ while (vdev->fault_tail_index != header.head) {
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+ memory_region_inject_faults(iommu_mr, 1,
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+ &queue[vdev->fault_tail_index]);
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+ vdev->fault_tail_index =
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+ (vdev->fault_tail_index + 1) % header.nb_entries;
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+ }
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+ bytes = pwrite(vdev->vbasedev.fd, &vdev->fault_tail_index, 4,
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+ vdev->dma_fault_region.fd_offset);
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+ if (bytes != 4) {
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+ error_report("%s unable to write the fault region tail index (0x%lx)",
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+ __func__, bytes);
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+ }
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+ g_free(queue_buffer);
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}
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static int vfio_register_ext_irq_handler(VFIOPCIDevice *vdev,
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diff --git a/hw/vfio/pci.h b/hw/vfio/pci.h
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index eef91065f1..03ac8919ef 100644
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--- a/hw/vfio/pci.h
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+++ b/hw/vfio/pci.h
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@@ -146,6 +146,7 @@ struct VFIOPCIDevice {
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EventNotifier req_notifier;
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VFIOPCIExtIRQ *ext_irqs;
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VFIORegion dma_fault_region;
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+ uint32_t fault_tail_index;
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int (*resetfn)(struct VFIOPCIDevice *);
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uint32_t vendor_id;
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uint32_t device_id;
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--
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2.27.0
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