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authorJoao Martins <joao.m.martins@oracle.com>2023-03-07 12:54:47 +0000
committerAlex Williamson <alex.williamson@redhat.com>2023-03-07 10:21:22 -0700
commitb153402a8941c2193e91ac50ed9720c7da6ee8db (patch)
treec3612e621961fa2c1727c504984e8e42e084911e /hw/vfio
parent6607109f0508f4fe218159e6cf083ec58ed6fbff (diff)
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vfio/common: Add device dirty page bitmap sync
Add device dirty page bitmap sync functionality. This uses the device DMA logging uAPI to sync dirty page bitmap from the device. Device dirty page bitmap sync is used only if all devices within a container support device dirty page tracking. Signed-off-by: Avihai Horon <avihaih@nvidia.com> Signed-off-by: Joao Martins <joao.m.martins@oracle.com> Reviewed-by: Cédric Le Goater <clg@redhat.com> Link: https://lore.kernel.org/r/20230307125450.62409-13-joao.m.martins@oracle.com Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'hw/vfio')
-rw-r--r--hw/vfio/common.c88
1 files changed, 79 insertions, 9 deletions
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index ae81af6..334c625 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -339,6 +339,9 @@ static int vfio_bitmap_alloc(VFIOBitmap *vbmap, hwaddr size)
return 0;
}
+static int vfio_get_dirty_bitmap(VFIOContainer *container, uint64_t iova,
+ uint64_t size, ram_addr_t ram_addr);
+
bool vfio_mig_active(void)
{
VFIOGroup *group;
@@ -562,10 +565,16 @@ static int vfio_dma_unmap(VFIOContainer *container,
.iova = iova,
.size = size,
};
+ bool need_dirty_sync = false;
+ int ret;
+
+ if (iotlb && vfio_devices_all_running_and_mig_active(container)) {
+ if (!vfio_devices_all_device_dirty_tracking(container) &&
+ container->dirty_pages_supported) {
+ return vfio_dma_unmap_bitmap(container, iova, size, iotlb);
+ }
- if (iotlb && container->dirty_pages_supported &&
- vfio_devices_all_running_and_mig_active(container)) {
- return vfio_dma_unmap_bitmap(container, iova, size, iotlb);
+ need_dirty_sync = true;
}
while (ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, &unmap)) {
@@ -591,10 +600,12 @@ static int vfio_dma_unmap(VFIOContainer *container,
return -errno;
}
- if (iotlb && vfio_devices_all_running_and_mig_active(container)) {
- cpu_physical_memory_set_dirty_range(iotlb->translated_addr, size,
- tcg_enabled() ? DIRTY_CLIENTS_ALL :
- DIRTY_CLIENTS_NOCODE);
+ if (need_dirty_sync) {
+ ret = vfio_get_dirty_bitmap(container, iova, size,
+ iotlb->translated_addr);
+ if (ret) {
+ return ret;
+ }
}
return 0;
@@ -1595,6 +1606,58 @@ static void vfio_listener_log_global_stop(MemoryListener *listener)
}
}
+static int vfio_device_dma_logging_report(VFIODevice *vbasedev, hwaddr iova,
+ hwaddr size, void *bitmap)
+{
+ uint64_t buf[DIV_ROUND_UP(sizeof(struct vfio_device_feature) +
+ sizeof(struct vfio_device_feature_dma_logging_report),
+ sizeof(__u64))] = {};
+ struct vfio_device_feature *feature = (struct vfio_device_feature *)buf;
+ struct vfio_device_feature_dma_logging_report *report =
+ (struct vfio_device_feature_dma_logging_report *)feature->data;
+
+ report->iova = iova;
+ report->length = size;
+ report->page_size = qemu_real_host_page_size();
+ report->bitmap = (__u64)(uintptr_t)bitmap;
+
+ feature->argsz = sizeof(buf);
+ feature->flags = VFIO_DEVICE_FEATURE_GET |
+ VFIO_DEVICE_FEATURE_DMA_LOGGING_REPORT;
+
+ if (ioctl(vbasedev->fd, VFIO_DEVICE_FEATURE, feature)) {
+ return -errno;
+ }
+
+ return 0;
+}
+
+static int vfio_devices_query_dirty_bitmap(VFIOContainer *container,
+ VFIOBitmap *vbmap, hwaddr iova,
+ hwaddr size)
+{
+ VFIODevice *vbasedev;
+ VFIOGroup *group;
+ int ret;
+
+ QLIST_FOREACH(group, &container->group_list, container_next) {
+ QLIST_FOREACH(vbasedev, &group->device_list, next) {
+ ret = vfio_device_dma_logging_report(vbasedev, iova, size,
+ vbmap->bitmap);
+ if (ret) {
+ error_report("%s: Failed to get DMA logging report, iova: "
+ "0x%" HWADDR_PRIx ", size: 0x%" HWADDR_PRIx
+ ", err: %d (%s)",
+ vbasedev->name, iova, size, ret, strerror(-ret));
+
+ return ret;
+ }
+ }
+ }
+
+ return 0;
+}
+
static int vfio_query_dirty_bitmap(VFIOContainer *container, VFIOBitmap *vbmap,
hwaddr iova, hwaddr size)
{
@@ -1635,10 +1698,12 @@ static int vfio_query_dirty_bitmap(VFIOContainer *container, VFIOBitmap *vbmap,
static int vfio_get_dirty_bitmap(VFIOContainer *container, uint64_t iova,
uint64_t size, ram_addr_t ram_addr)
{
+ bool all_device_dirty_tracking =
+ vfio_devices_all_device_dirty_tracking(container);
VFIOBitmap vbmap;
int ret;
- if (!container->dirty_pages_supported) {
+ if (!container->dirty_pages_supported && !all_device_dirty_tracking) {
cpu_physical_memory_set_dirty_range(ram_addr, size,
tcg_enabled() ? DIRTY_CLIENTS_ALL :
DIRTY_CLIENTS_NOCODE);
@@ -1650,7 +1715,12 @@ static int vfio_get_dirty_bitmap(VFIOContainer *container, uint64_t iova,
return ret;
}
- ret = vfio_query_dirty_bitmap(container, &vbmap, iova, size);
+ if (all_device_dirty_tracking) {
+ ret = vfio_devices_query_dirty_bitmap(container, &vbmap, iova, size);
+ } else {
+ ret = vfio_query_dirty_bitmap(container, &vbmap, iova, size);
+ }
+
if (ret) {
goto out;
}