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vfio/pci: Implement the DMA fault handler

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Whenever the eventfd is triggered, we retrieve the DMA fault(s)
from the mmapped fault region and inject them in the iommu
memory region.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Kunkun Jiang <jiangkunkun@huawei.com>
This commit is contained in:
Chen Qun 2019-03-05 16:35:32 +01:00
parent 58476d1b47
commit 93c6df7e5a
1 changed files with 96 additions and 0 deletions
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96
vfio-pci-Implement-the-DMA-fault-handler.patch Normal file
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@ -0,0 +1,96 @@
From 139d0b3474c29427fea4a0ed47f51c01a76a8636 Mon Sep 17 00:00:00 2001
From: Eric Auger <eric.auger@redhat.com>
Date: Tue, 5 Mar 2019 16:35:32 +0100
Subject: [PATCH] vfio/pci: Implement the DMA fault handler
Whenever the eventfd is triggered, we retrieve the DMA fault(s)
from the mmapped fault region and inject them in the iommu
memory region.
Signed-off-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Kunkun Jiang <jiangkunkun@huawei.com>
---
hw/vfio/pci.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
hw/vfio/pci.h | 1 +
2 files changed, 51 insertions(+)
diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index 0db7d68258..d1198c8a23 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -2922,10 +2922,60 @@ static PCIPASIDOps vfio_pci_pasid_ops = {
static void vfio_dma_fault_notifier_handler(void *opaque)
{
VFIOPCIExtIRQ *ext_irq = opaque;
+ VFIOPCIDevice *vdev = ext_irq->vdev;
+ PCIDevice *pdev = &vdev->pdev;
+ AddressSpace *as = pci_device_iommu_address_space(pdev);
+ IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(as->root);
+ struct vfio_region_dma_fault header;
+ struct iommu_fault *queue;
+ char *queue_buffer = NULL;
+ ssize_t bytes;
if (!event_notifier_test_and_clear(&ext_irq->notifier)) {
return;
}
+
+ bytes = pread(vdev->vbasedev.fd, &header, sizeof(header),
+ vdev->dma_fault_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->dma_fault_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->dma_fault_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_tail_index != header.head) {
+ memory_region_inject_faults(iommu_mr, 1,
+ &queue[vdev->fault_tail_index]);
+ vdev->fault_tail_index =
+ (vdev->fault_tail_index + 1) % header.nb_entries;
+ }
+ bytes = pwrite(vdev->vbasedev.fd, &vdev->fault_tail_index, 4,
+ vdev->dma_fault_region.fd_offset);
+ if (bytes != 4) {
+ error_report("%s unable to write the fault region tail index (0x%lx)",
+ __func__, bytes);
+ }
+ g_free(queue_buffer);
}
static int vfio_register_ext_irq_handler(VFIOPCIDevice *vdev,
diff --git a/hw/vfio/pci.h b/hw/vfio/pci.h
index 815154656c..e31bc0173a 100644
--- a/hw/vfio/pci.h
+++ b/hw/vfio/pci.h
@@ -142,6 +142,7 @@ typedef struct VFIOPCIDevice {
EventNotifier req_notifier;
VFIOPCIExtIRQ *ext_irqs;
VFIORegion dma_fault_region;
+ uint32_t fault_tail_index;
int (*resetfn)(struct VFIOPCIDevice *);
uint32_t vendor_id;
uint32_t device_id;
--
2.27.0