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Wed, 24 Jun 2020 18:59:03 +0000 (UTC) Date: Wed, 24 Jun 2020 12:55:19 -0600 From: Alex Williamson To: Kirti Wankhede Subject: Re: [PATCH QEMU v25 12/17] vfio: Add function to start and stop dirty pages tracking Message-ID: <20200624125519.1e60c8a3@x1.home> In-Reply-To: <1592684486-18511-13-git-send-email-kwankhede@nvidia.com> References: <1592684486-18511-1-git-send-email-kwankhede@nvidia.com> <1592684486-18511-13-git-send-email-kwankhede@nvidia.com> Organization: Red Hat MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=207.211.31.81; envelope-from=alex.williamson@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/24 01:59:40 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: cohuck@redhat.com, cjia@nvidia.com, aik@ozlabs.ru, Zhengxiao.zx@Alibaba-inc.com, shuangtai.tst@alibaba-inc.com, qemu-devel@nongnu.org, peterx@redhat.com, eauger@redhat.com, yi.l.liu@intel.com, quintela@redhat.com, ziye.yang@intel.com, armbru@redhat.com, mlevitsk@redhat.com, pasic@linux.ibm.com, felipe@nutanix.com, zhi.a.wang@intel.com, kevin.tian@intel.com, yan.y.zhao@intel.com, dgilbert@redhat.com, changpeng.liu@intel.com, eskultet@redhat.com, Ken.Xue@amd.com, jonathan.davies@nutanix.com, pbonzini@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Sun, 21 Jun 2020 01:51:21 +0530 Kirti Wankhede wrote: > Call VFIO_IOMMU_DIRTY_PAGES ioctl to start and stop dirty pages tracking > for VFIO devices. > > Signed-off-by: Kirti Wankhede > Reviewed-by: Dr. David Alan Gilbert > --- > 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 > +#include > > #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) > +{ > + 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; > +} What happens when we have a device that supports a migration region paired with an IOMMU that doesn't report dirty page tracking, shouldn't we have tested container->dirty_pages_supported somewhere in the process of determining if the device is migratable? Thanks, Alex > + > /* ---------------------------------------------------------------------- */ > > 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); > + > 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); > } > } >