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b=NQu/DJbyAxt3L6ix+4xYh6eiS85CFCt+7TQVXAbDipVCj/Sll+R9ZMZ9KWmtANr8zu6oVC5GJj6sF4f7lJBbQ24yXBj2h3ljKJX/cvr5UPTuCzaAMCR0+HgSYLXSauNaQmwP5/Bjqq+xW0g4fjHhTn7aZ+VeX6WGuvOPG/BCI3NwA+IA+n7FzwbyvAubXhUaihAkaWdlGLOXLWEaszoWwaLV6alp9/VcuimeFJupUA+jUpw+r4IFlwReIa4rnju+cOXHTfRgPJdx+3EXRyTENt8jj26aKEx0qz5cT/NPq1FHacovuFcJdpb3YQKYzDYmERCW4kJPnKoCZyGhzI+x2Q== From: Tejus GK To: qemu-devel@nongnu.org Cc: quintela@redhat.com, peterx@redhat.com, leobras@redhat.com, berrange@redhat.com, aravind.retnakaran@nutanix.com, shivam.kumar1@nutanix.com, Tejus GK Subject: [RFC 1/2] migration/vmstate: Introduce vmstate_save_state_with_err Date: Fri, 26 May 2023 11:50:02 +0000 Message-Id: <20230526115003.212004-2-tejus.gk@nutanix.com> X-Mailer: git-send-email 2.22.3 In-Reply-To: <20230526115003.212004-1-tejus.gk@nutanix.com> References: <20230526115003.212004-1-tejus.gk@nutanix.com> Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: SJ0PR03CA0136.namprd03.prod.outlook.com (2603:10b6:a03:33c::21) To BYAPR02MB4806.namprd02.prod.outlook.com (2603:10b6:a03:42::30) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BYAPR02MB4806:EE_|CO6PR02MB8738:EE_ X-MS-Office365-Filtering-Correlation-Id: 9affeb4f-6697-4963-82a8-08db5ddf64b4 x-proofpoint-crosstenant: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=148.163.151.68; envelope-from=tejus.gk@nutanix.com; helo=mx0a-002c1b01.pphosted.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, 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 @nutanix.com) X-ZM-MESSAGEID: 1685101892225100005 Content-Type: text/plain; charset="utf-8" Currently, a few code paths exist in the function vmstate_save_state_v, which ultimately leads to a migration failure. However, an update in the current MigrationState for the error description is never done. vmstate.c somehow doesn't seem to allow the use of migrate_set_error due to some dependencies for unit tests. Hence, this patch introduces a new function vmstate_save_state_with_err, which will eventually propagate the error message to savevm.c where a migrate_set_error call can be eventually done. Signed-off-by: Tejus GK Acked-by: Peter Xu --- include/migration/vmstate.h | 4 +++- migration/savevm.c | 2 +- migration/vmstate.c | 12 +++++++++--- 3 files changed, 13 insertions(+), 5 deletions(-) diff --git a/include/migration/vmstate.h b/include/migration/vmstate.h index 084f5e784a..244d00ca74 100644 --- a/include/migration/vmstate.h +++ b/include/migration/vmstate.h @@ -1194,9 +1194,11 @@ int vmstate_load_state(QEMUFile *f, const VMStateDes= cription *vmsd, void *opaque, int version_id); int vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd, void *opaque, JSONWriter *vmdesc); +int vmstate_save_state_with_err(QEMUFile *f, const VMStateDescription *vms= d, + void *opaque, JSONWriter *vmdesc, Error **errp); int vmstate_save_state_v(QEMUFile *f, const VMStateDescription *vmsd, void *opaque, JSONWriter *vmdesc, - int version_id); + int version_id, Error **errp); =20 bool vmstate_save_needed(const VMStateDescription *vmsd, void *opaque); =20 diff --git a/migration/savevm.c b/migration/savevm.c index 03795ce8dc..ec7f66619f 100644 --- a/migration/savevm.c +++ b/migration/savevm.c @@ -1000,7 +1000,7 @@ static int vmstate_save(QEMUFile *f, SaveStateEntry *= se, JSONWriter *vmdesc) if (!se->vmsd) { vmstate_save_old_style(f, se, vmdesc); } else { - ret =3D vmstate_save_state(f, se->vmsd, se->opaque, vmdesc); + ret =3D vmstate_save_state_with_err(f, se->vmsd, se->opaque, vmdes= c, &local_err); if (ret) { return ret; } diff --git a/migration/vmstate.c b/migration/vmstate.c index af01d54b6f..35a9b67afc 100644 --- a/migration/vmstate.c +++ b/migration/vmstate.c @@ -315,11 +315,17 @@ bool vmstate_save_needed(const VMStateDescription *vm= sd, void *opaque) int vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd, void *opaque, JSONWriter *vmdesc_id) { - return vmstate_save_state_v(f, vmsd, opaque, vmdesc_id, vmsd->version_= id); + return vmstate_save_state_v(f, vmsd, opaque, vmdesc_id, vmsd->version_= id, NULL); +} + +int vmstate_save_state_with_err(QEMUFile *f, const VMStateDescription *vms= d, + void *opaque, JSONWriter *vmdesc_id, Error **errp) +{ + return vmstate_save_state_v(f, vmsd, opaque, vmdesc_id, vmsd->version_= id, errp); } =20 int vmstate_save_state_v(QEMUFile *f, const VMStateDescription *vmsd, - void *opaque, JSONWriter *vmdesc, int version_id) + void *opaque, JSONWriter *vmdesc, int version_id,= Error **errp) { int ret =3D 0; const VMStateField *field =3D vmsd->fields; @@ -377,7 +383,7 @@ int vmstate_save_state_v(QEMUFile *f, const VMStateDesc= ription *vmsd, } else if (field->flags & VMS_VSTRUCT) { ret =3D vmstate_save_state_v(f, field->vmsd, curr_elem, vmdesc_loop, - field->struct_version_id); + field->struct_version_id, e= rrp); } else { ret =3D field->info->put(f, curr_elem, size, field, vmdesc_loop); --=20 2.22.3 From nobody Wed Apr 24 21:11:22 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; arc=pass (i=1 dmarc=pass fromdomain=nutanix.com); dmarc=pass(p=none dis=none) header.from=nutanix.com ARC-Seal: i=2; a=rsa-sha256; t=1685101913; cv=pass; d=zohomail.com; s=zohoarc; b=huHbpY0SpwUwvM/shVlkhlL0O/bIf9Axij4k4jn+9wip3wsXQLEwwLsOrqKfG2xVDSltx21nw+bdwdxVMy8uQ5ZcO5HWNpKINtze8j8974WAmeVOdcFNkt7tYN7pnWKYBN+x6ElvuG+iFugdVyVXnt3epKr9jhW8Mj+qH4gN1VY= ARC-Message-Signature: i=2; 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b=Sy8Mm9p2nz3MPfp5H+DOeLOCDML7EEefxhRy24OWhUTZ0N4BfqmI0W1/nCHUinJN2eiTPLuPZOHfM+edFvaXR62r3oOS8QAnk23TNFOyyVFVSIek3DIgdxO9C2+Zp0sQqSOK6TjUog3MREVXGWOTrvmKKB0gRUINRL8JwcVFxj2NFyiS3jmwrrvvAkdQdNQjV45P2Vyjxx8O00JJGR8yb9+REoluNv54uNgOgV1zmu3YoZiSlBUaHmp6s2CtdRWYhVvrmLEBPbu5+frxo9mSm/PcjHhlNYz910RK4k1f+SlXzGTEHP7oAkO30/YNoaxNaSwdVTxT0/AIas/n9QritQ== From: Tejus GK To: qemu-devel@nongnu.org Cc: quintela@redhat.com, peterx@redhat.com, leobras@redhat.com, berrange@redhat.com, aravind.retnakaran@nutanix.com, shivam.kumar1@nutanix.com, Tejus GK Subject: [RFC 2/2] migration: Update error description outside migration.c Date: Fri, 26 May 2023 11:50:03 +0000 Message-Id: <20230526115003.212004-3-tejus.gk@nutanix.com> X-Mailer: git-send-email 2.22.3 In-Reply-To: <20230526115003.212004-1-tejus.gk@nutanix.com> References: <20230526115003.212004-1-tejus.gk@nutanix.com> Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: SJ0PR03CA0136.namprd03.prod.outlook.com (2603:10b6:a03:33c::21) To BYAPR02MB4806.namprd02.prod.outlook.com (2603:10b6:a03:42::30) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BYAPR02MB4806:EE_|CO6PR02MB8738:EE_ X-MS-Office365-Filtering-Correlation-Id: a36e78c3-2480-4ef8-6a33-08db5ddf64fe x-proofpoint-crosstenant: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=148.163.151.68; envelope-from=tejus.gk@nutanix.com; helo=mx0a-002c1b01.pphosted.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, 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 @nutanix.com) X-ZM-MESSAGEID: 1685101914584100009 Content-Type: text/plain; charset="utf-8" A few code paths exist in the source code,where a migration is marked as failed via MIGRATION_STATUS_FAILED, but the failure happens outside of migration.c In such cases, an error_report() call is made, however the current MigrationState is never updated with the error description, and hence clients like libvirt never know the actual reason for the failure. This patch covers such cases outside of migration.c and updates the error description at the appropriate places. Signed-off-by: Tejus GK Acked-by: Peter Xu --- migration/savevm.c | 17 ++++++++++++++--- migration/vmstate.c | 7 ++++--- 2 files changed, 18 insertions(+), 6 deletions(-) diff --git a/migration/savevm.c b/migration/savevm.c index ec7f66619f..783d42009c 100644 --- a/migration/savevm.c +++ b/migration/savevm.c @@ -979,6 +979,8 @@ static void save_section_footer(QEMUFile *f, SaveStateE= ntry *se) static int vmstate_save(QEMUFile *f, SaveStateEntry *se, JSONWriter *vmdes= c) { int ret; + Error *local_err =3D NULL; + MigrationState *s =3D migrate_get_current(); =20 if ((!se->ops || !se->ops->save_state) && !se->vmsd) { return 0; @@ -1002,6 +1004,8 @@ static int vmstate_save(QEMUFile *f, SaveStateEntry *= se, JSONWriter *vmdesc) } else { ret =3D vmstate_save_state_with_err(f, se->vmsd, se->opaque, vmdes= c, &local_err); if (ret) { + migrate_set_error(s, local_err); + error_report_err(local_err); return ret; } } @@ -1068,10 +1072,14 @@ void qemu_savevm_send_open_return_path(QEMUFile *f) int qemu_savevm_send_packaged(QEMUFile *f, const uint8_t *buf, size_t len) { uint32_t tmp; + MigrationState *ms =3D migrate_get_current(); + Error *local_err =3D NULL; =20 if (len > MAX_VM_CMD_PACKAGED_SIZE) { - error_report("%s: Unreasonably large packaged state: %zu", + error_setg(&local_err, "%s: Unreasonably large packaged state: %zu= ", __func__, len); + migrate_set_error(ms, local_err); + error_report_err(local_err); return -1; } =20 @@ -1475,8 +1483,11 @@ int qemu_savevm_state_complete_precopy_non_iterable(= QEMUFile *f, * bdrv_activate_all() on the other end won't fail. */ ret =3D bdrv_inactivate_all(); if (ret) { - error_report("%s: bdrv_inactivate_all() failed (%d)", - __func__, ret); + Error *local_err =3D NULL; + error_setg(&local_err, "%s: bdrv_inactivate_all() failed (%d)", + __func__, ret); + migrate_set_error(ms, local_err); + error_report_err(local_err); qemu_file_set_error(f, ret); return ret; } diff --git a/migration/vmstate.c b/migration/vmstate.c index 35a9b67afc..71dc21c273 100644 --- a/migration/vmstate.c +++ b/migration/vmstate.c @@ -14,6 +14,7 @@ #include "migration.h" #include "migration/vmstate.h" #include "savevm.h" +#include "qapi/error.h" #include "qapi/qmp/json-writer.h" #include "qemu-file.h" #include "qemu/bitops.h" @@ -336,7 +337,7 @@ int vmstate_save_state_v(QEMUFile *f, const VMStateDesc= ription *vmsd, ret =3D vmsd->pre_save(opaque); trace_vmstate_save_state_pre_save_res(vmsd->name, ret); if (ret) { - error_report("pre-save failed: %s", vmsd->name); + error_setg(errp, "pre-save failed: %s", vmsd->name); return ret; } } @@ -389,8 +390,8 @@ int vmstate_save_state_v(QEMUFile *f, const VMStateDesc= ription *vmsd, vmdesc_loop); } if (ret) { - error_report("Save of field %s/%s failed", - vmsd->name, field->name); + error_setg(errp, "Save of field %s/%s failed", + vmsd->name, field->name); if (vmsd->post_save) { vmsd->post_save(opaque); } --=20 2.22.3