4daf6a89f5
Add migration support for VFIO devices and the pre-requisite for this Signed-off-by: imxcc <xingchaochao@huawei.com>
84 lines
2.4 KiB
Diff
84 lines
2.4 KiB
Diff
From 4363ea5cded9c6d2838a9564b067f583a6ef077f Mon Sep 17 00:00:00 2001
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From: Kirti Wankhede <kwankhede@nvidia.com>
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Date: Mon, 26 Oct 2020 15:06:22 +0530
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Subject: [PATCH] vfio: Add function to start and stop dirty pages tracking
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Call VFIO_IOMMU_DIRTY_PAGES ioctl to start and stop dirty pages tracking
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for VFIO devices.
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Signed-off-by: Kirti Wankhede <kwankhede@nvidia.com>
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Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
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---
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hw/vfio/migration.c | 36 ++++++++++++++++++++++++++++++++++++
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1 file changed, 36 insertions(+)
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diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c
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index 0d2bd9e5cd..0bdf6a1820 100644
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--- a/hw/vfio/migration.c
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+++ b/hw/vfio/migration.c
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@@ -11,6 +11,7 @@
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#include "qemu/main-loop.h"
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#include "qemu/cutils.h"
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#include <linux/vfio.h>
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+#include <sys/ioctl.h>
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#include "sysemu/sysemu.h"
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#include "hw/vfio/vfio-common.h"
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@@ -391,10 +392,40 @@ static int vfio_load_device_config_state(QEMUFile *f, void *opaque)
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return qemu_file_get_error(f);
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}
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+static int vfio_set_dirty_page_tracking(VFIODevice *vbasedev, bool start)
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+{
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+ int ret;
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+ VFIOMigration *migration = vbasedev->migration;
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+ VFIOContainer *container = vbasedev->group->container;
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+ struct vfio_iommu_type1_dirty_bitmap dirty = {
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+ .argsz = sizeof(dirty),
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+ };
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+
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+ if (start) {
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+ if (migration->device_state & VFIO_DEVICE_STATE_SAVING) {
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+ dirty.flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_START;
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+ } else {
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+ return -EINVAL;
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+ }
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+ } else {
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+ dirty.flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_STOP;
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+ }
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+
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+ ret = ioctl(container->fd, VFIO_IOMMU_DIRTY_PAGES, &dirty);
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+ if (ret) {
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+ error_report("Failed to set dirty tracking flag 0x%x errno: %d",
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+ dirty.flags, errno);
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+ return -errno;
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+ }
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+ return ret;
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+}
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+
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static void vfio_migration_cleanup(VFIODevice *vbasedev)
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{
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VFIOMigration *migration = vbasedev->migration;
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+ vfio_set_dirty_page_tracking(vbasedev, false);
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+
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if (migration->region.mmaps) {
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vfio_region_unmap(&migration->region);
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}
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@@ -435,6 +466,11 @@ static int vfio_save_setup(QEMUFile *f, void *opaque)
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return ret;
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}
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+ ret = vfio_set_dirty_page_tracking(vbasedev, true);
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+ if (ret) {
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+ return ret;
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+ }
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+
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qemu_put_be64(f, VFIO_MIG_FLAG_END_OF_STATE);
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ret = qemu_file_get_error(f);
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--
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2.27.0
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