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Re: [PATCH QEMU v25 12/17] vfio: Add function to start and stop dirty pa
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [PATCH QEMU v25 12/17] vfio: Add function to start and stop dirty pages tracking |
Date: |
Tue, 23 Jun 2020 12:01:25 +0100 |
User-agent: |
Mutt/1.14.0 (2020-05-02) |
* Cornelia Huck (cohuck@redhat.com) wrote:
> On Sun, 21 Jun 2020 01:51:21 +0530
> Kirti Wankhede <kwankhede@nvidia.com> wrote:
>
> > Call VFIO_IOMMU_DIRTY_PAGES ioctl to start and stop dirty pages tracking
> > for VFIO devices.
> >
> > Signed-off-by: Kirti Wankhede <kwankhede@nvidia.com>
> > Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
> > ---
> > hw/vfio/migration.c | 36 ++++++++++++++++++++++++++++++++++++
> > 1 file changed, 36 insertions(+)
> >
> > diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c
> > index faacea5327cb..e0fbb3a01855 100644
> > --- a/hw/vfio/migration.c
> > +++ b/hw/vfio/migration.c
> > @@ -11,6 +11,7 @@
> > #include "qemu/main-loop.h"
> > #include "qemu/cutils.h"
> > #include <linux/vfio.h>
> > +#include <sys/ioctl.h>
> >
> > #include "sysemu/runstate.h"
> > #include "hw/vfio/vfio-common.h"
> > @@ -329,6 +330,32 @@ static int vfio_load_device_config_state(QEMUFile *f,
> > void *opaque)
> > return qemu_file_get_error(f);
> > }
> >
> > +static int vfio_start_dirty_page_tracking(VFIODevice *vbasedev, bool start)
>
> I find 'start' functions that may also stop something a bit confusing.
> Maybe vfio_toggle_dirty_page_tracking()?
I don't think toggle is any better; I always think of toggle as flipping
the state to the other state.
vfio_set_dirty_page_tracking maybe?
Dave
> > +{
> > + int ret;
> > + VFIOContainer *container = vbasedev->group->container;
> > + struct vfio_iommu_type1_dirty_bitmap dirty = {
> > + .argsz = sizeof(dirty),
> > + };
> > +
> > + if (start) {
> > + if (vbasedev->device_state & VFIO_DEVICE_STATE_SAVING) {
> > + dirty.flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_START;
> > + } else {
> > + return -EINVAL;
> > + }
> > + } else {
> > + dirty.flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_STOP;
> > + }
> > +
> > + ret = ioctl(container->fd, VFIO_IOMMU_DIRTY_PAGES, &dirty);
> > + if (ret) {
> > + error_report("Failed to set dirty tracking flag 0x%x errno: %d",
> > + dirty.flags, errno);
> > + }
> > + return ret;
> > +}
> > +
> > /* ----------------------------------------------------------------------
> > */
> >
> > static int vfio_save_setup(QEMUFile *f, void *opaque)
> > @@ -360,6 +387,11 @@ static int vfio_save_setup(QEMUFile *f, void *opaque)
> > return ret;
> > }
> >
> > + ret = vfio_start_dirty_page_tracking(vbasedev, true);
> > + if (ret) {
> > + return ret;
> > + }
> > +
> > qemu_put_be64(f, VFIO_MIG_FLAG_END_OF_STATE);
> >
> > ret = qemu_file_get_error(f);
> > @@ -375,6 +407,8 @@ static void vfio_save_cleanup(void *opaque)
> > VFIODevice *vbasedev = opaque;
> > VFIOMigration *migration = vbasedev->migration;
> >
> > + vfio_start_dirty_page_tracking(vbasedev, false);
>
> I suppose we can't do anything useful if stopping dirty page tracking
> fails?
>
> > +
> > if (migration->region.mmaps) {
> > vfio_region_unmap(&migration->region);
> > }
> > @@ -706,6 +740,8 @@ static void vfio_migration_state_notifier(Notifier
> > *notifier, void *data)
> > if (ret) {
> > error_report("%s: Failed to set state RUNNING",
> > vbasedev->name);
> > }
> > +
> > + vfio_start_dirty_page_tracking(vbasedev, false);
> > }
> > }
> >
>
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
- Re: [PATCH QEMU v25 09/17] vfio: Add load state functions to SaveVMHandlers, (continued)
[PATCH QEMU v25 10/17] memory: Set DIRTY_MEMORY_MIGRATION when IOMMU is enabled, Kirti Wankhede, 2020/06/20
[PATCH QEMU v25 11/17] vfio: Get migration capability flags for container, Kirti Wankhede, 2020/06/20
[PATCH QEMU v25 12/17] vfio: Add function to start and stop dirty pages tracking, Kirti Wankhede, 2020/06/20
Re: [PATCH QEMU v25 12/17] vfio: Add function to start and stop dirty pages tracking, Alex Williamson, 2020/06/24
[PATCH QEMU v25 13/17] vfio: create mapped iova list when vIOMMU is enabled, Kirti Wankhede, 2020/06/20
[PATCH QEMU v25 14/17] vfio: Add vfio_listener_log_sync to mark dirty pages, Kirti Wankhede, 2020/06/20