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a="360908873" X-IronPort-AV: E=Sophos;i="6.01,168,1684825200"; d="scan'208";a="360908873" X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10755"; a="720494362" X-IronPort-AV: E=Sophos;i="6.01,168,1684825200"; d="scan'208";a="720494362" From: Zhenzhong Duan To: qemu-devel@nongnu.org Cc: alex.williamson@redhat.com, clg@redhat.com, joao.m.martins@oracle.com, avihaih@nvidia.com, chao.p.peng@intel.com Subject: [PATCH v4 4/5] vfio/pci: Free resources when vfio_migration_realize fails Date: Thu, 29 Jun 2023 16:40:41 +0800 Message-Id: <20230629084042.86502-5-zhenzhong.duan@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230629084042.86502-1-zhenzhong.duan@intel.com> References: <20230629084042.86502-1-zhenzhong.duan@intel.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=192.55.52.120; envelope-from=zhenzhong.duan@intel.com; helo=mga04.intel.com X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 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_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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 @intel.com) X-ZM-MESSAGEID: 1688028872278100003 Content-Type: text/plain; charset="utf-8" When vfio_realize() succeeds, hot unplug will call vfio_exitfn() to free resources allocated in vfio_realize(); when vfio_realize() fails, vfio_exitfn() is never called and we need to free resources in vfio_realize(). In the case that vfio_migration_realize() fails, e.g: with -only-migratable & enable-migration=3Doff, we see below: (qemu) device_add vfio-pci,host=3D81:11.1,id=3Dvfio1,bus=3Droot1,enable-mig= ration=3Doff 0000:81:11.1: Migration disabled Error: disallowing migration blocker (--only-migratable) for: 0000:81:11.1:= Migration is disabled for VFIO device If we hotplug again we should see same log as above, but we see: (qemu) device_add vfio-pci,host=3D81:11.1,id=3Dvfio1,bus=3Droot1,enable-mig= ration=3Doff Error: vfio 0000:81:11.1: device is already attached That's because some references to VFIO device isn't released, we should check return value of vfio_migration_realize() and release the references, then VFIO device will be truely released when hotplug fails. Fixes: a22651053b59 ("vfio: Make vfio-pci device migration capable") Signed-off-by: Zhenzhong Duan --- hw/vfio/pci.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c index 54a8179d1c64..dc69d3031b24 100644 --- a/hw/vfio/pci.c +++ b/hw/vfio/pci.c @@ -3210,6 +3210,7 @@ static void vfio_realize(PCIDevice *pdev, Error **err= p) ret =3D vfio_migration_realize(vbasedev, errp); if (ret) { error_report("%s: Migration disabled", vbasedev->name); + goto out_vfio_migration; } } =20 @@ -3219,6 +3220,8 @@ static void vfio_realize(PCIDevice *pdev, Error **err= p) =20 return; =20 +out_vfio_migration: + vfio_migration_exit(vbasedev); out_deregister: vfio_disable_interrupts(vdev); out_intx_disable: --=20 2.34.1