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GET /api/1.1/patches/2223224/?format=api
{ "id": 2223224, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2223224/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260414182231.18776-3-mohamed@unpredictable.fr/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/1.1/projects/14/?format=api", "name": "QEMU Development", "link_name": "qemu-devel", "list_id": "qemu-devel.nongnu.org", "list_email": "qemu-devel@nongnu.org", "web_url": "", "scm_url": "", "webscm_url": "" }, "msgid": "<20260414182231.18776-3-mohamed@unpredictable.fr>", "date": "2026-04-14T18:22:26", "name": "[2/7] whpx: i386: unknown MSR configurability", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "63acdfcd69ab8dce1c8dc33cb86ecfe6bf91f889", "submitter": { "id": 91318, "url": "http://patchwork.ozlabs.org/api/1.1/people/91318/?format=api", "name": "Mohamed Mediouni", "email": "mohamed@unpredictable.fr" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260414182231.18776-3-mohamed@unpredictable.fr/mbox/", "series": [ { "id": 499883, "url": "http://patchwork.ozlabs.org/api/1.1/series/499883/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=499883", "date": "2026-04-14T18:22:24", "name": "whpx: i386: Some more changes", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/499883/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2223224/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2223224/checks/", "tags": {}, "headers": { "Return-Path": "<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=unpredictable.fr header.i=@unpredictable.fr\n header.a=rsa-sha256 header.s=sig1 header.b=VrykrCOB;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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Tue, 14 Apr 2026 14:22:45 -0400", "from outbound.pv.icloud.com (unknown [127.0.0.2])\n by p00-icloudmta-asmtp-us-west-1a-60-percent-9 (Postfix) with ESMTPS id\n 309CF18000A5; Tue, 14 Apr 2026 18:22:39 +0000 (UTC)", "from localhost.localdomain (unknown [17.56.9.36])\n by p00-icloudmta-asmtp-us-west-1a-60-percent-9 (Postfix) with ESMTPSA id\n 3AEC218001F3; Tue, 14 Apr 2026 18:22:38 +0000 (UTC)" ], "Dkim-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=unpredictable.fr;\n s=sig1; t=1776190962; x=1778782962;\n bh=H55iPnzts7qCVmoBJ9TP4r+Lt8OW7TgpBaoEUQHYL2o=;\n h=From:To:Subject:Date:Message-ID:MIME-Version:x-icloud-hme;\n b=VrykrCOB9H7MgObmRL9mUlzJN7CzWedoV1snUy1feQosOjODOINnHqTqAovPzLhfsDxBrqlfkAotT6G5yZEPc6zaTkQ2jY178Heb8RceEM4Y+8xnKLhL9g7COsccBw3QauJjRC2fWsXitW9u2JXwGkHMAeZYWNDHqK1r9hzNwzIAy75m/t3GZSiK1TSkWTV1pnK5+xD3vOkVXmYH+FO345HKn8B4244fJWfbBDNJdg4nsuzgdDVenCNINUkT9v3hHTuMR5SE+GKGbFDotIt8ZbYBahqUCIJyAlUVy7vNu1eLaJoX0KHe9LtLk/+bR/JovZxknBmBL4gGee1Twz3Eyw==", "mail-alias-created-date": "1752046281608", "From": "Mohamed Mediouni <mohamed@unpredictable.fr>", "To": "qemu-devel@nongnu.org", "Cc": "Pedro Barbuda <pbarbuda@microsoft.com>,\n Mohamed Mediouni <mohamed@unpredictable.fr>,\n Zhao Liu <zhao1.liu@intel.com>, Paolo Bonzini <pbonzini@redhat.com>", "Subject": "[PATCH 2/7] whpx: i386: unknown MSR configurability", "Date": "Tue, 14 Apr 2026 20:22:26 +0200", "Message-ID": "<20260414182231.18776-3-mohamed@unpredictable.fr>", "X-Mailer": "git-send-email 2.50.1", "In-Reply-To": "<20260414182231.18776-1-mohamed@unpredictable.fr>", "References": "<20260414182231.18776-1-mohamed@unpredictable.fr>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-Authority-Info-Out": "v=2.4 cv=eurSD4pX c=1 sm=1 tr=0 ts=69de85f1\n cx=c_apl:c_pps:t_out a=azHRBMxVc17uSn+fyuI/eg==:117\n a=azHRBMxVc17uSn+fyuI/eg==:17 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22\n a=9z_AL-2ZILZrMqfKHsQA:9", "X-Proofpoint-GUID": "VmnGIc_BjCs2wDpOi-EmYpdF8eXejgal", "X-Proofpoint-ORIG-GUID": "VmnGIc_BjCs2wDpOi-EmYpdF8eXejgal", "X-Proofpoint-Spam-Details-Enc": "AW1haW4tMjYwNDE0MDE3MiBTYWx0ZWRfX0gJf44td70Jx\n TPVztUtOgVvADpr6L1wyoS41lNj5XaqlRZGjKciqR01Ba7UIYGPtmqEOzXPpxy4+9xUB1UiMUET\n ldvWUfXEi4MIjcd8FItK2kwit4o4/FIKTLk34x5ZZNj0mWFROz1RJz5qWVsZeslXOm6rlMnNcrF\n 2popnsjpvPtpUtwS30t3RikNfrcionnwKYoHM4PC5iOFUuleOiPL4gK6k/4n0lOOfKaIKl+7me7\n XkrTilOPlwQwmNzZQi05KIFF5oLalWIe2eZebiWVeP3RlcLynTkwkY2zysUb9mQtK/OCUF7uo1H\n N8gHH9leih0PcQ0scrVr2O9/NY74xQDON9OmqUfVbMOeBuU8HEv2XFiSM9BaQw=", "X-Proofpoint-Virus-Version": "vendor=baseguard\n engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49\n definitions=2026-04-14_03,2026-04-13_04,2025-10-01_01", "X-Proofpoint-Spam-Details": "rule=notspam policy=default score=0 bulkscore=0\n suspectscore=0 mlxlogscore=999 lowpriorityscore=0 mlxscore=0 clxscore=1030\n spamscore=0 malwarescore=0 phishscore=0 adultscore=0 classifier=spam\n authscore=0 adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000\n definitions=main-2604140172", "Received-SPF": "pass client-ip=57.103.66.200;\n envelope-from=mohamed@unpredictable.fr; helo=outbound.pv.icloud.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, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001,\n SPF_HELO_PASS=-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": "qemu development <qemu-devel.nongnu.org>", "List-Unsubscribe": "<https://lists.nongnu.org/mailman/options/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>", "List-Archive": "<https://lists.nongnu.org/archive/html/qemu-devel>", "List-Post": "<mailto:qemu-devel@nongnu.org>", "List-Help": "<mailto:qemu-devel-request@nongnu.org?subject=help>", "List-Subscribe": "<https://lists.nongnu.org/mailman/listinfo/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=subscribe>", "Errors-To": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org", "Sender": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org" }, "content": "Add an option to inject back a GPF for unknown MSRs.\n\nKeep it on by default for now as Linux expects accesses to some\nAMD-specific MSRs to always succeed when on an AMD host.\n\nSigned-off-by: Mohamed Mediouni <mohamed@unpredictable.fr>\n---\n accel/whpx/whpx-common.c | 38 ++++++++++++++++++++++++++++++++++\n include/system/whpx-internal.h | 1 +\n target/i386/whpx/whpx-all.c | 4 ++++\n 3 files changed, 43 insertions(+)", "diff": "diff --git a/accel/whpx/whpx-common.c b/accel/whpx/whpx-common.c\nindex 59be996aef..706871f138 100644\n--- a/accel/whpx/whpx-common.c\n+++ b/accel/whpx/whpx-common.c\n@@ -505,6 +505,38 @@ static void whpx_set_hyperv(Object *obj, Visitor *v,\n }\n }\n \n+static void whpx_set_unknown_msr(Object *obj, Visitor *v,\n+ const char *name, void *opaque,\n+ Error **errp)\n+{\n+ struct whpx_state *whpx = &whpx_global;\n+ OnOffAuto mode;\n+\n+ if (!visit_type_OnOffAuto(v, name, &mode, errp)) {\n+ return;\n+ }\n+\n+ switch (mode) {\n+ case ON_OFF_AUTO_ON:\n+ whpx->ignore_unknown_msr = true;\n+ break;\n+\n+ case ON_OFF_AUTO_OFF:\n+ whpx->ignore_unknown_msr = false;\n+ break;\n+\n+ case ON_OFF_AUTO_AUTO:\n+ whpx->ignore_unknown_msr = true;\n+ break;\n+ default:\n+ /*\n+ * The value was checked in visit_type_OnOffAuto() above. If\n+ * we get here, then something is wrong in QEMU.\n+ */\n+ abort();\n+ }\n+}\n+\n static void whpx_cpu_accel_class_init(ObjectClass *oc, const void *data)\n {\n AccelCPUClass *acc = ACCEL_CPU_CLASS(oc);\n@@ -538,6 +570,11 @@ static void whpx_accel_class_init(ObjectClass *oc, const void *data)\n NULL, NULL);\n object_class_property_set_description(oc, \"hyperv\",\n \"Configure Hyper-V enlightenments\");\n+ object_class_property_add(oc, \"ignore-unknown-msr\", \"OnOffAuto\",\n+ NULL, whpx_set_unknown_msr,\n+ NULL, NULL);\n+ object_class_property_set_description(oc, \"ignore-unknown-msr\",\n+ \"Configure unknown MSR behavior\");\n }\n \n static void whpx_accel_instance_init(Object *obj)\n@@ -552,6 +589,7 @@ static void whpx_accel_instance_init(Object *obj)\n whpx->hyperv_enlightenments_required = false;\n /* Value determined at whpx_accel_init */\n whpx->hyperv_enlightenments_enabled = false;\n+ whpx->ignore_unknown_msr = true;\n }\n \n static const TypeInfo whpx_accel_type = {\ndiff --git a/include/system/whpx-internal.h b/include/system/whpx-internal.h\nindex cf782cf5f8..86639627b3 100644\n--- a/include/system/whpx-internal.h\n+++ b/include/system/whpx-internal.h\n@@ -47,6 +47,7 @@ struct whpx_state {\n bool hyperv_enlightenments_required;\n bool hyperv_enlightenments_enabled;\n \n+ bool ignore_unknown_msr;\n };\n \n extern struct whpx_state whpx_global;\ndiff --git a/target/i386/whpx/whpx-all.c b/target/i386/whpx/whpx-all.c\nindex 56a789c5fd..b248afb5e7 100644\n--- a/target/i386/whpx/whpx-all.c\n+++ b/target/i386/whpx/whpx-all.c\n@@ -2048,6 +2048,10 @@ int whpx_vcpu_run(CPUState *cpu)\n vcpu->exit_ctx.MsrAccess.AccessInfo.IsWrite);\n }\n \n+ if (!is_known_msr && !whpx->ignore_unknown_msr) {\n+ x86_emul_raise_exception(&X86_CPU(cpu)->env, EXCP0D_GPF, 0);\n+ }\n+\n hr = whp_dispatch.WHvSetVirtualProcessorRegisters(\n whpx->partition,\n cpu->cpu_index,\n", "prefixes": [ "2/7" ] }