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Thu, 21 May 2020 16:51:02 +0000 (UTC) Date: Thu, 21 May 2020 17:50:59 +0100 From: "Dr. David Alan Gilbert" To: Kirti Wankhede Subject: Re: [PATCH QEMU v23 14/18] vfio: Add function to start and stop dirty pages tracking Message-ID: <20200521165059.GK2752@work-vm> References: <1589999088-31477-1-git-send-email-kwankhede@nvidia.com> <1589999088-31477-15-git-send-email-kwankhede@nvidia.com> MIME-Version: 1.0 In-Reply-To: <1589999088-31477-15-git-send-email-kwankhede@nvidia.com> User-Agent: Mutt/1.13.4 (2020-02-15) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Received-SPF: pass client-ip=207.211.31.120; envelope-from=dgilbert@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/21 01:44:25 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=0.001, 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=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_PASS=-0.001, T_HK_NAME_DR=0.01, URIBL_BLOCKED=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, alex.williamson@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" * 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 This does seem to match my reading of your 4/8 ioctl sefinition patch, so: Reviewed-by: Dr. David Alan Gilbert I must admit I don't see why 'argsz' is needed. Dave > --- > hw/vfio/migration.c | 36 ++++++++++++++++++++++++++++++++++++ > 1 file changed, 36 insertions(+) > > diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c > index b9bbe38e539c..7729c90782bd 100644 > --- a/hw/vfio/migration.c > +++ b/hw/vfio/migration.c > @@ -9,6 +9,7 @@ > > #include "qemu/osdep.h" > #include "qemu/main-loop.h" > +#include > #include > > #include "sysemu/runstate.h" > @@ -297,6 +298,32 @@ 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; > +} > + > /* ---------------------------------------------------------------------- */ > > static int vfio_save_setup(QEMUFile *f, void *opaque) > @@ -327,6 +354,11 @@ 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); > @@ -342,6 +374,8 @@ 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); > } > @@ -676,6 +710,8 @@ 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); > } > } > > -- > 2.7.0 > -- Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK