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Sun, 07 Apr 2024 11:43:58 -0700 (PDT) X-Google-Smtp-Source: AGHT+IEncrWTRL9OQYlHj/oiaC0poeP8koQiLR+IGsB9uk8F8xg5rxHrVe1NcUnA2Oo3BYcG/gsMaQ== X-Received: by 2002:a05:6122:c8a:b0:4d8:74f7:a280 with SMTP id ba10-20020a0561220c8a00b004d874f7a280mr3776738vkb.0.1712515437471; Sun, 07 Apr 2024 11:43:57 -0700 (PDT) From: peterx@redhat.com To: Peter Maydell , qemu-devel@nongnu.org Cc: Wei Wang , Lei Wang , Avihai Horon , Fabiano Rosas , peterx@redhat.com, Prasad Pandit , qemu-stable Subject: [PULL 1/2] migration/postcopy: ensure preempt channel is ready before loading states Date: Sun, 7 Apr 2024 14:43:53 -0400 Message-ID: <20240407184354.1839435-2-peterx@redhat.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240407184354.1839435-1-peterx@redhat.com> References: <20240407184354.1839435-1-peterx@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=peterx@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -44 X-Spam_score: -4.5 X-Spam_bar: ---- X-Spam_report: (-4.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-2.355, 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_H4=-0.01, RCVD_IN_MSPIKE_WL=-0.01, 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1712515491689100003 Content-Type: text/plain; charset="utf-8" From: Wei Wang Before loading the guest states, ensure that the preempt channel has been ready to use, as some of the states (e.g. via virtio_load) might trigger page faults that will be handled through the preempt channel. So yield to the main thread in the case that the channel create event hasn't been dispatched. Cc: qemu-stable Fixes: 9358982744 ("migration: Send requested page directly in rp-return th= read") Originally-by: Lei Wang Link: https://lore.kernel.org/all/9aa5d1be-7801-40dd-83fd-f7e041ced249@inte= l.com/T/ Signed-off-by: Lei Wang Signed-off-by: Wei Wang Link: https://lore.kernel.org/r/20240405034056.23933-1-wei.w.wang@intel.com [peterx: add a todo section, add Fixes and copy stable for 8.0+] Signed-off-by: Peter Xu --- migration/savevm.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/migration/savevm.c b/migration/savevm.c index 388d7af7cd..e7c1215671 100644 --- a/migration/savevm.c +++ b/migration/savevm.c @@ -2342,6 +2342,27 @@ static int loadvm_handle_cmd_packaged(MigrationIncom= ingState *mis) =20 QEMUFile *packf =3D qemu_file_new_input(QIO_CHANNEL(bioc)); =20 + /* + * Before loading the guest states, ensure that the preempt channel has + * been ready to use, as some of the states (e.g. via virtio_load) mig= ht + * trigger page faults that will be handled through the preempt channe= l. + * So yield to the main thread in the case that the channel create eve= nt + * hasn't been dispatched. + * + * TODO: if we can move migration loadvm out of main thread, then we + * won't block main thread from polling the accept() fds. We can drop + * this as a whole when that is done. + */ + do { + if (!migrate_postcopy_preempt() || !qemu_in_coroutine() || + mis->postcopy_qemufile_dst) { + break; + } + + aio_co_schedule(qemu_get_current_aio_context(), qemu_coroutine_sel= f()); + qemu_coroutine_yield(); + } while (1); + ret =3D qemu_loadvm_state_main(packf, mis); trace_loadvm_handle_cmd_packaged_main(ret); qemu_fclose(packf); --=20 2.44.0 From nobody Fri May 17 11:28:40 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1712515497; cv=none; d=zohomail.com; s=zohoarc; b=dWnqJs+gboNi3KPXozGs7YBO0almVc+bp9HsAVTK+/TksoaOS/FOCunTaL7TaFiVKem3mFIUIA602Co4YQZi0+mxEWDKmp+lE3l3jqVLcql8+nILELtNKLqnanbRFpMmEJgNX6WC4fOhwQGK/NeuHppylbLhUJ6zukVm+ZSU+2g= ARC-Message-Signature: i=1; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=peterx@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -44 X-Spam_score: -4.5 X-Spam_bar: ---- X-Spam_report: (-4.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-2.355, 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_H4=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1712515499720100003 Content-Type: text/plain; charset="utf-8" From: Avihai Horon Commit 8cb2f8b172e7 ("docs/migration: Create migration/ directory") changed migration documentation file structure but forgot to update the entries in the MAINTAINERS file. Commit 4c6f8a79ae53 ("docs/migration: Split 'dirty limit'") extracted dirty limit documentation to a new file without updating dirty limit section in MAINTAINERS file. Fix the above. Fixes: 8cb2f8b172e7 ("docs/migration: Create migration/ directory") Fixes: 4c6f8a79ae53 ("docs/migration: Split 'dirty limit'") Signed-off-by: Avihai Horon Link: https://lore.kernel.org/r/20240407081125.13951-1-avihaih@nvidia.com Signed-off-by: Peter Xu --- MAINTAINERS | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/MAINTAINERS b/MAINTAINERS index e71183eef9..d3fc2a06e3 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2170,7 +2170,7 @@ S: Supported F: hw/vfio/* F: include/hw/vfio/ F: docs/igd-assign.txt -F: docs/devel/vfio-migration.rst +F: docs/devel/migration/vfio.rst =20 vfio-ccw M: Eric Farman @@ -2231,6 +2231,7 @@ F: qapi/virtio.json F: net/vhost-user.c F: include/hw/virtio/ F: docs/devel/virtio* +F: docs/devel/migration/virtio.rst =20 virtio-balloon M: Michael S. Tsirkin @@ -3422,7 +3423,7 @@ F: migration/ F: scripts/vmstate-static-checker.py F: tests/vmstate-static-checker-data/ F: tests/qtest/migration-test.c -F: docs/devel/migration.rst +F: docs/devel/migration/ F: qapi/migration.json F: tests/migration/ F: util/userfaultfd.c @@ -3442,6 +3443,7 @@ F: include/sysemu/dirtylimit.h F: migration/dirtyrate.c F: migration/dirtyrate.h F: include/sysemu/dirtyrate.h +F: docs/devel/migration/dirty-limit.rst =20 Detached LUKS header M: Hyman Huang --=20 2.44.0