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[PATCH QEMU v23 16/18] vfio: Add ioctl to get dirty pages bitmap during
From: |
Kirti Wankhede |
Subject: |
[PATCH QEMU v23 16/18] vfio: Add ioctl to get dirty pages bitmap during dma unmap. |
Date: |
Wed, 20 May 2020 23:54:46 +0530 |
With vIOMMU, IO virtual address range can get unmapped while in pre-copy
phase of migration. In that case, unmap ioctl should return pages pinned
in that range and QEMU should find its correcponding guest physical
addresses and report those dirty.
Suggested-by: Alex Williamson <address@hidden>
Signed-off-by: Kirti Wankhede <address@hidden>
Reviewed-by: Neo Jia <address@hidden>
---
hw/vfio/common.c | 84 +++++++++++++++++++++++++++++++++++++++++++++++++++++---
1 file changed, 80 insertions(+), 4 deletions(-)
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 3f7049fbd1b0..2dd9e8b24788 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -311,11 +311,82 @@ static bool vfio_devices_are_stopped_and_saving(void)
return true;
}
+static bool vfio_devices_are_running_and_saving(void)
+{
+ VFIOGroup *group;
+ VFIODevice *vbasedev;
+
+ QLIST_FOREACH(group, &vfio_group_list, next) {
+ QLIST_FOREACH(vbasedev, &group->device_list, next) {
+ if ((vbasedev->device_state & VFIO_DEVICE_STATE_SAVING) &&
+ (vbasedev->device_state & VFIO_DEVICE_STATE_RUNNING)) {
+ continue;
+ } else {
+ return false;
+ }
+ }
+ }
+ return true;
+}
+
+static int vfio_dma_unmap_bitmap(VFIOContainer *container,
+ hwaddr iova, ram_addr_t size,
+ IOMMUTLBEntry *iotlb)
+{
+ struct vfio_iommu_type1_dma_unmap *unmap;
+ struct vfio_bitmap *bitmap;
+ uint64_t pages = TARGET_PAGE_ALIGN(size) >> TARGET_PAGE_BITS;
+ int ret;
+
+ unmap = g_malloc0(sizeof(*unmap) + sizeof(*bitmap));
+ if (!unmap) {
+ return -ENOMEM;
+ }
+
+ unmap->argsz = sizeof(*unmap) + sizeof(*bitmap);
+ unmap->iova = iova;
+ unmap->size = size;
+ unmap->flags |= VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP;
+ bitmap = (struct vfio_bitmap *)&unmap->data;
+
+ /*
+ * cpu_physical_memory_set_dirty_lebitmap() expects pages in bitmap of
+ * TARGET_PAGE_SIZE to mark those dirty. Hence set bitmap_pgsize to
+ * TARGET_PAGE_SIZE.
+ */
+
+ bitmap->pgsize = TARGET_PAGE_SIZE;
+ bitmap->size = ROUND_UP(pages, sizeof(__u64) * BITS_PER_BYTE) /
+ BITS_PER_BYTE;
+
+ if (bitmap->size > container->max_dirty_bitmap_size) {
+ error_report("UNMAP: Size of bitmap too big 0x%llx", bitmap->size);
+ ret = -E2BIG;
+ goto unmap_exit;
+ }
+
+ bitmap->data = g_malloc0(bitmap->size);
+
+ ret = ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, unmap);
+ if (!ret) {
+ cpu_physical_memory_set_dirty_lebitmap((uint64_t *)bitmap->data,
+ iotlb->translated_addr, pages);
+ } else {
+ error_report("VFIO_UNMAP_DMA with DIRTY_BITMAP : %d", -errno);
+ }
+
+ g_free(bitmap->data);
+unmap_exit:
+ g_free(unmap);
+ return ret;
+}
+
/*
* DMA - Mapping and unmapping for the "type1" IOMMU interface used on x86
*/
static int vfio_dma_unmap(VFIOContainer *container,
- hwaddr iova, ram_addr_t size)
+ hwaddr iova, ram_addr_t size,
+ IOMMUTLBEntry *iotlb)
{
struct vfio_iommu_type1_dma_unmap unmap = {
.argsz = sizeof(unmap),
@@ -324,6 +395,11 @@ static int vfio_dma_unmap(VFIOContainer *container,
.size = size,
};
+ if (iotlb && container->dirty_pages_supported &&
+ vfio_devices_are_running_and_saving()) {
+ return vfio_dma_unmap_bitmap(container, iova, size, iotlb);
+ }
+
while (ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, &unmap)) {
/*
* The type1 backend has an off-by-one bug in the kernel (71a7d3d78e3c
@@ -371,7 +447,7 @@ static int vfio_dma_map(VFIOContainer *container, hwaddr
iova,
* the VGA ROM space.
*/
if (ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0 ||
- (errno == EBUSY && vfio_dma_unmap(container, iova, size) == 0 &&
+ (errno == EBUSY && vfio_dma_unmap(container, iova, size, NULL) == 0 &&
ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0)) {
return 0;
}
@@ -519,7 +595,7 @@ static void vfio_iommu_map_notify(IOMMUNotifier *n,
IOMMUTLBEntry *iotlb)
iotlb->addr_mask + 1, vaddr, ret);
}
} else {
- ret = vfio_dma_unmap(container, iova, iotlb->addr_mask + 1);
+ ret = vfio_dma_unmap(container, iova, iotlb->addr_mask + 1, iotlb);
if (ret) {
error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", "
"0x%"HWADDR_PRIx") = %d (%m)",
@@ -822,7 +898,7 @@ static void vfio_listener_region_del(MemoryListener
*listener,
}
if (try_unmap) {
- ret = vfio_dma_unmap(container, iova, int128_get64(llsize));
+ ret = vfio_dma_unmap(container, iova, int128_get64(llsize), NULL);
if (ret) {
error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", "
"0x%"HWADDR_PRIx") = %d (%m)",
--
2.7.0
- Re: [PATCH QEMU v23 10/18] vfio: Add load state functions to SaveVMHandlers, (continued)
- [PATCH QEMU v23 11/18] iommu: add callback to get address limit IOMMU supports, Kirti Wankhede, 2020/05/20
- [PATCH QEMU v23 12/18] memory: Set DIRTY_MEMORY_MIGRATION when IOMMU is enabled, Kirti Wankhede, 2020/05/20
- [PATCH QEMU v23 13/18] vfio: Get migration capability flags for container, Kirti Wankhede, 2020/05/20
- [PATCH QEMU v23 14/18] vfio: Add function to start and stop dirty pages tracking, Kirti Wankhede, 2020/05/20
- [PATCH QEMU v23 15/18] vfio: Add vfio_listener_log_sync to mark dirty pages, Kirti Wankhede, 2020/05/20
- [PATCH QEMU v23 16/18] vfio: Add ioctl to get dirty pages bitmap during dma unmap.,
Kirti Wankhede <=
- [PATCH QEMU v23 17/18] vfio: Make vfio-pci device migration capable, Kirti Wankhede, 2020/05/20
- [PATCH QEMU v23 18/18] qapi: Add VFIO devices migration stats in Migration stats, Kirti Wankhede, 2020/05/20