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Tue, 23 Jun 2020 08:07:58 +0000 (UTC) Date: Tue, 23 Jun 2020 10:07:55 +0200 From: Cornelia Huck To: Kirti Wankhede Subject: Re: [PATCH QEMU v25 05/17] vfio: Add VM state change handler to know state of VM Message-ID: <20200623100755.1a41197a.cohuck@redhat.com> In-Reply-To: <1592684486-18511-6-git-send-email-kwankhede@nvidia.com> References: <1592684486-18511-1-git-send-email-kwankhede@nvidia.com> <1592684486-18511-6-git-send-email-kwankhede@nvidia.com> Organization: Red Hat GmbH 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=205.139.110.120; envelope-from=cohuck@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/23 01:53:54 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: 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, 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" On Sun, 21 Jun 2020 01:51:14 +0530 Kirti Wankhede wrote: > VM state change handler gets called on change in VM's state. This is used to set > VFIO device state to _RUNNING. > > Signed-off-by: Kirti Wankhede > Reviewed-by: Neo Jia > Reviewed-by: Dr. David Alan Gilbert > --- > hw/vfio/migration.c | 87 +++++++++++++++++++++++++++++++++++++++++++ > hw/vfio/trace-events | 2 + > include/hw/vfio/vfio-common.h | 4 ++ > 3 files changed, 93 insertions(+) > > diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c > index 48ac385d80a7..fcecc0bb0874 100644 > --- a/hw/vfio/migration.c > +++ b/hw/vfio/migration.c > @@ -10,6 +10,7 @@ > #include "qemu/osdep.h" > #include > > +#include "sysemu/runstate.h" > #include "hw/vfio/vfio-common.h" > #include "cpu.h" > #include "migration/migration.h" > @@ -74,6 +75,85 @@ err: > return ret; > } > > +static int vfio_migration_set_state(VFIODevice *vbasedev, uint32_t mask, > + uint32_t value) I commented on this interface already in https://lore.kernel.org/qemu-devel/20200505120459.62bd0b16.cohuck@redhat.com/, but I did not see any reply... I guess my comments still apply (here and below). > +{ > + VFIOMigration *migration = vbasedev->migration; > + VFIORegion *region = &migration->region; > + uint32_t device_state; > + int ret; > + > + ret = pread(vbasedev->fd, &device_state, sizeof(device_state), > + region->fd_offset + offsetof(struct vfio_device_migration_info, > + device_state)); > + if (ret < 0) { > + error_report("%s: Failed to read device state %d %s", > + vbasedev->name, ret, strerror(errno)); > + return ret; > + } > + > + device_state = (device_state & mask) | value; > + > + if (!VFIO_DEVICE_STATE_VALID(device_state)) { > + return -EINVAL; > + } > + > + ret = pwrite(vbasedev->fd, &device_state, sizeof(device_state), > + region->fd_offset + offsetof(struct vfio_device_migration_info, > + device_state)); > + if (ret < 0) { > + error_report("%s: Failed to set device state %d %s", > + vbasedev->name, ret, strerror(errno)); > + > + ret = pread(vbasedev->fd, &device_state, sizeof(device_state), > + region->fd_offset + offsetof(struct vfio_device_migration_info, > + device_state)); > + if (ret < 0) { > + error_report("%s: On failure, failed to read device state %d %s", > + vbasedev->name, ret, strerror(errno)); > + return ret; > + } > + > + if (VFIO_DEVICE_STATE_IS_ERROR(device_state)) { > + error_report("%s: Device is in error state 0x%x", > + vbasedev->name, device_state); > + return -EFAULT; E.g., why -EFAULT here? > + } > + } > + > + vbasedev->device_state = device_state; > + trace_vfio_migration_set_state(vbasedev->name, device_state); > + return 0; > +} > + > +static void vfio_vmstate_change(void *opaque, int running, RunState state) > +{ > + VFIODevice *vbasedev = opaque; > + > + if ((vbasedev->vm_running != running)) { > + int ret; > + uint32_t value = 0, mask = 0; > + > + if (running) { > + value = VFIO_DEVICE_STATE_RUNNING; > + if (vbasedev->device_state & VFIO_DEVICE_STATE_RESUMING) { > + mask = ~VFIO_DEVICE_STATE_RESUMING; > + } > + } else { > + mask = ~VFIO_DEVICE_STATE_RUNNING; > + } > + > + ret = vfio_migration_set_state(vbasedev, mask, value); > + if (ret) { > + error_report("%s: Failed to set device state 0x%x", > + vbasedev->name, value & mask); > + } > + vbasedev->vm_running = running; > + trace_vfio_vmstate_change(vbasedev->name, running, RunState_str(state), > + value & mask); > + } > +} > + > static int vfio_migration_init(VFIODevice *vbasedev, > struct vfio_region_info *info) > {