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Thu, 27 Oct 2022 20:23:59 +0000 From: Annie Li To: qemu-devel@nongnu.org Cc: annie.li@oracle.com, mark.kanda@oracle.com Subject: [PATCH 1/2] block: Set the name of BlockBackend if possible Date: Thu, 27 Oct 2022 16:23:32 -0400 Message-Id: <20221027202332.3229-1-annie.li@oracle.com> X-Mailer: git-send-email 2.34.3 X-ClientProxiedBy: MN2PR15CA0022.namprd15.prod.outlook.com (2603:10b6:208:1b4::35) To DM6PR10MB2523.namprd10.prod.outlook.com (2603:10b6:5:b2::27) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6PR10MB2523:EE_|PH7PR10MB6081:EE_ X-MS-Office365-Filtering-Correlation-Id: c6e76781-f5d3-46e6-8d61-08dab8592e24 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255; 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envelope-from=annie.li@oracle.com; helo=mx0a-00069f02.pphosted.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, 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: , Sender: "Qemu-devel" Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org When QEMU emulates the SCSI device, it sets the 'device_id' of the SCSI device with the serial number configured by 'serial=' property, or with 'blk->name' of the block backend otherwise. Then QEMU emulates SCSI commands and fills the mandatory Device identification page(0x83) with the 'device_id' info. However, 'blk->name' of the block backend is NULL if the block backend is defined by '-blockdev' option. This causes the QEMU returns unconfigured empty page to the guest. As a result, this may cause various issues on the guest side. For example, Windows guest crashes due this in BZ#1708490, BZ#1722710#c10. This crash issue has been fixed in Windows vioscsi driver by patching the vpd page[1], but it is better for QEMU to return the non NULL vpd page if possible. This patch sets the 'blk->name' of the block backend that is defined by '-blockdev' option, so the QEMU returns non NULL vpd page when emulating SCSI device. [1] https://github.com/virtio-win/kvm-guest-drivers-windows/commit/b57548c769ed9f431c34f6449ce432dd077cb02e Signed-off-by: Annie Li --- block/block-backend.c | 10 +++++++++- hw/core/qdev-properties-system.c | 1 + include/sysemu/block-backend-global-state.h | 2 ++ 3 files changed, 12 insertions(+), 1 deletion(-) diff --git a/block/block-backend.c b/block/block-backend.c index aa4adf06ae..255b009270 100644 --- a/block/block-backend.c +++ b/block/block-backend.c @@ -471,8 +471,9 @@ BlockBackend *blk_new_open(const char *filename, const char *reference, static void blk_delete(BlockBackend *blk) { assert(!blk->refcnt); - assert(!blk->name); assert(!blk->dev); + g_free(blk->name); + blk->name = NULL; if (blk->public.throttle_group_member.throttle_state) { blk_io_limits_disable(blk); } @@ -2594,3 +2595,10 @@ int blk_make_empty(BlockBackend *blk, Error **errp) return bdrv_make_empty(blk->root, errp); } + +void blk_set_name(BlockBackend *blk, char *name) +{ + if (!blk->name) { + blk->name = g_strdup(name); + } +} diff --git a/hw/core/qdev-properties-system.c b/hw/core/qdev-properties-system.c index a91f60567a..9504acf4df 100644 --- a/hw/core/qdev-properties-system.c +++ b/hw/core/qdev-properties-system.c @@ -144,6 +144,7 @@ static void set_drive_helper(Object *obj, Visitor *v, const char *name, ctx = iothread ? bdrv_get_aio_context(bs) : qemu_get_aio_context(); blk = blk_new(ctx, 0, BLK_PERM_ALL); blk_created = true; + blk_set_name(blk, str); ret = blk_insert_bs(blk, bs, errp); if (ret < 0) { diff --git a/include/sysemu/block-backend-global-state.h b/include/sysemu/block-backend-global-state.h index 415f0c91d7..95f166f9c7 100644 --- a/include/sysemu/block-backend-global-state.h +++ b/include/sysemu/block-backend-global-state.h @@ -113,4 +113,6 @@ const BdrvChild *blk_root(BlockBackend *blk); int blk_make_empty(BlockBackend *blk, Error **errp); +void blk_set_name(BlockBackend *blk, char *name); + #endif /* BLOCK_BACKEND_GLOBAL_STATE_H */