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Tsirkin" To: Christian Borntraeger Cc: Alex =?iso-8859-1?Q?Benn=E9e?= , qemu-devel@nongnu.org, fam@euphon.net, berrange@redhat.com, f4bug@amsat.org, aurelien@aurel32.net, pbonzini@redhat.com, stefanha@redhat.com, crosa@redhat.com, Raphael Norwitz , Kevin Wolf , Hanna Reitz , "Dr. David Alan Gilbert" , Viresh Kumar , Mathieu Poirier , "open list:Block layer core" , "open list:virtiofs" Subject: Re: [PATCH v1 5/9] hw/virtio: introduce virtio_device_should_start Message-ID: <20221114121959-mutt-send-email-mst@kernel.org> References: <20221108092308.1717426-1-alex.bennee@linaro.org> <20221108092308.1717426-6-alex.bennee@linaro.org> <2277569a-c218-30d1-4d88-9b77d3604513@linux.ibm.com> <20221114113518-mutt-send-email-mst@kernel.org> <20221114115549-mutt-send-email-mst@kernel.org> <2bd5f801-a203-2598-3e6e-ed8f5dad5159@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <2bd5f801-a203-2598-3e6e-ed8f5dad5159@linux.ibm.com> Received-SPF: pass client-ip=170.10.129.124; envelope-from=mst@redhat.com; helo=us-smtp-delivery-124.mimecast.com 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_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Mon, Nov 14, 2022 at 06:15:30PM +0100, Christian Borntraeger wrote: > > > Am 14.11.22 um 18:10 schrieb Michael S. Tsirkin: > > On Mon, Nov 14, 2022 at 05:55:09PM +0100, Christian Borntraeger wrote: > > > > > > > > > Am 14.11.22 um 17:37 schrieb Michael S. Tsirkin: > > > > On Mon, Nov 14, 2022 at 05:18:53PM +0100, Christian Borntraeger wrote: > > > > > Am 08.11.22 um 10:23 schrieb Alex Bennée: > > > > > > The previous fix to virtio_device_started revealed a problem in its > > > > > > use by both the core and the device code. The core code should be able > > > > > > to handle the device "starting" while the VM isn't running to handle > > > > > > the restoration of migration state. To solve this dual use introduce a > > > > > > new helper for use by the vhost-user backends who all use it to feed a > > > > > > should_start variable. > > > > > > > > > > > > We can also pick up a change vhost_user_blk_set_status while we are at > > > > > > it which follows the same pattern. > > > > > > > > > > > > Fixes: 9f6bcfd99f (hw/virtio: move vm_running check to virtio_device_started) > > > > > > Fixes: 27ba7b027f (hw/virtio: add boilerplate for vhost-user-gpio device) > > > > > > Signed-off-by: Alex Bennée > > > > > > Cc: "Michael S. Tsirkin" > > > > > > > > > > Hmmm, is this > > > > > commit 259d69c00b67c02a67f3bdbeeea71c2c0af76c35 > > > > > Author: Alex Bennée > > > > > AuthorDate: Mon Nov 7 12:14:07 2022 +0000 > > > > > Commit: Michael S. Tsirkin > > > > > CommitDate: Mon Nov 7 14:08:18 2022 -0500 > > > > > > > > > > hw/virtio: introduce virtio_device_should_start > > > > > > > > > > and older version? > > > > > > > > This is what got merged: > > > > https://lore.kernel.org/r/20221107121407.1010913-1-alex.bennee%40linaro.org > > > > This patch was sent after I merged the RFC. > > > > I think the only difference is the commit log but I might be missing > > > > something. > > > > > > > > > This does not seem to fix the regression that I have reported. > > > > > > > > This was applied on top of 9f6bcfd99f which IIUC does, right? > > > > > > > > > > > > > > QEMU master still fails for me for suspend/resume to disk: > > > > > > #0 0x000003ff8e3980a6 in __pthread_kill_implementation () at /lib64/libc.so.6 > > > #1 0x000003ff8e348580 in raise () at /lib64/libc.so.6 > > > #2 0x000003ff8e32b5c0 in abort () at /lib64/libc.so.6 > > > #3 0x000003ff8e3409da in __assert_fail_base () at /lib64/libc.so.6 > > > #4 0x000003ff8e340a4e in () at /lib64/libc.so.6 > > > #5 0x000002aa1ffa8966 in vhost_vsock_common_pre_save (opaque=) at ../hw/virtio/vhost-vsock-common.c:203 > > > #6 0x000002aa1fe5e0ee in vmstate_save_state_v > > > (f=f@entry=0x2aa21bdc170, vmsd=0x2aa204ac5f0 , opaque=0x2aa21bac9f8, vmdesc=vmdesc@entry=0x3fddc08eb30, version_id=version_id@entry=0) at ../migration/vmstate.c:329 > > > #7 0x000002aa1fe5ebf8 in vmstate_save_state (f=f@entry=0x2aa21bdc170, vmsd=, opaque=, vmdesc_id=vmdesc_id@entry=0x3fddc08eb30) at ../migration/vmstate.c:317 > > > #8 0x000002aa1fe75bd0 in vmstate_save (f=f@entry=0x2aa21bdc170, se=se@entry=0x2aa21bdbe90, vmdesc=vmdesc@entry=0x3fddc08eb30) at ../migration/savevm.c:908 > > > #9 0x000002aa1fe79584 in qemu_savevm_state_complete_precopy_non_iterable (f=f@entry=0x2aa21bdc170, in_postcopy=in_postcopy@entry=false, inactivate_disks=inactivate_disks@entry=true) > > > at ../migration/savevm.c:1393 > > > #10 0x000002aa1fe79a96 in qemu_savevm_state_complete_precopy (f=0x2aa21bdc170, iterable_only=iterable_only@entry=false, inactivate_disks=inactivate_disks@entry=true) at ../migration/savevm.c:1459 > > > #11 0x000002aa1fe6d6ee in migration_completion (s=0x2aa218ef600) at ../migration/migration.c:3314 > > > #12 migration_iteration_run (s=0x2aa218ef600) at ../migration/migration.c:3761 > > > #13 migration_thread (opaque=opaque@entry=0x2aa218ef600) at ../migration/migration.c:3989 > > > #14 0x000002aa201f0b8c in qemu_thread_start (args=) at ../util/qemu-thread-posix.c:505 > > > #15 0x000003ff8e396248 in start_thread () at /lib64/libc.so.6 > > > #16 0x000003ff8e41183e in thread_start () at /lib64/libc.so.6 > > > > > > Michael, your previous branch did work if I recall correctly. > > > > That one was failing under github CI though (for reasons we didn't > > really address, such as disconnect during stop causing a recursive > > call to stop, but there you are). > Even the double revert of everything? I don't remember at this point. > So how do we proceed now? I'm hopeful Alex will come up with a fix. -- MST