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GET /api/patches/2224854/?format=api
{ "id": 2224854, "url": "http://patchwork.ozlabs.org/api/patches/2224854/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260418223320.51330-18-mohamed@unpredictable.fr/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/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": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260418223320.51330-18-mohamed@unpredictable.fr>", "list_archive_url": null, "date": "2026-04-18T22:32:59", "name": "[17/38] 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/people/91318/?format=api", "name": "Mohamed Mediouni", "email": "mohamed@unpredictable.fr" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260418223320.51330-18-mohamed@unpredictable.fr/mbox/", "series": [ { "id": 500475, "url": "http://patchwork.ozlabs.org/api/series/500475/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=500475", "date": "2026-04-18T22:32:54", "name": "WHPX x86 updates for QEMU 11.1", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/500475/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2224854/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2224854/checks/", "tags": {}, "related": [], "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=YtlC/9Y5;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; helo=lists1p.gnu.org;\n envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n receiver=patchwork.ozlabs.org)" ], "Received": [ "from lists1p.gnu.org (lists1p.gnu.org [209.51.188.17])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fymqW71jnz1yGt\n\tfor <incoming@patchwork.ozlabs.org>; Sun, 19 Apr 2026 08:38:15 +1000 (AEST)", "from localhost ([::1] helo=lists1p.gnu.org)\n\tby lists1p.gnu.org with esmtp (Exim 4.90_1)\n\t(envelope-from <qemu-devel-bounces@nongnu.org>)\n\tid 1wEEF8-0006gg-2U; Sat, 18 Apr 2026 18:34:26 -0400", "from eggs.gnu.org ([2001:470:142:3::10])\n by lists1p.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)\n (Exim 4.90_1) (envelope-from <mohamed@unpredictable.fr>)\n id 1wEEEj-0006J4-Cd\n for qemu-devel@nongnu.org; Sat, 18 Apr 2026 18:34:01 -0400", "from p-east2-cluster3-host11-snip4-3.eps.apple.com ([57.103.77.174]\n helo=outbound.st.icloud.com)\n by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)\n (Exim 4.90_1) (envelope-from <mohamed@unpredictable.fr>)\n id 1wEEEg-0004xF-GC\n for qemu-devel@nongnu.org; Sat, 18 Apr 2026 18:34:00 -0400", "from outbound.st.icloud.com (unknown [127.0.0.2])\n by p00-icloudmta-asmtp-us-east-1a-100-percent-1 (Postfix) with ESMTPS id\n 8AAB518000C4; Sat, 18 Apr 2026 22:33:56 +0000 (UTC)", "from localhost.localdomain (unknown [17.42.251.67])\n by p00-icloudmta-asmtp-us-east-1a-100-percent-1 (Postfix) with ESMTPSA id\n 6E81F18000A8; Sat, 18 Apr 2026 22:33:54 +0000 (UTC)" ], "Dkim-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=unpredictable.fr;\n s=sig1; t=1776551637; x=1779143637;\n bh=6dRDJ5VEmS78xsRk6kMHBpp9Wu7kQoHjBWY816Egd9Q=;\n h=From:To:Subject:Date:Message-ID:MIME-Version:x-icloud-hme;\n b=YtlC/9Y56yhtbRa+XjmzSFOtZubmXQ7B0DiMIJSCkJz5/6NSToVdu36Kq+NSjcb4hgw2pGMEMxM4aJlCXePkr7x7enN4Eg6xpUl2KdjaSEZo7UaglUY2AK6UnT5GudmpH21IWA2KmjIis1T1buCN8/cznv/z+xh8FpGQXVMEPrQqSMIngL6/7safzGN1DcC7HYG9soPXJamTFOlilqEXCm0VDnr0vYXsaAh0pkdLTy8bPxR60U1Zl3nWBauy3kqwvdvSBMYF9laOiBplDCbwtneT6QxA5Bkcx7UbnfXwd7YC54bUY8U9YicHfHejfgl5As1rNNQ297KeSWW1KKr5Lg==", "mail-alias-created-date": "1752046281608", "From": "Mohamed Mediouni <mohamed@unpredictable.fr>", "To": "qemu-devel@nongnu.org", "Cc": "Mohamed Mediouni <mohamed@unpredictable.fr>,\n \"Michael S. Tsirkin\" <mst@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>,\n Zhao Liu <zhao1.liu@intel.com>, Pedro Barbuda <pbarbuda@microsoft.com>,\n Roman Bolshakov <rbolshakov@ddn.com>, qemu-arm@nongnu.org,\n Pierrick Bouvier <pierrick.bouvier@linaro.org>,\n Peter Maydell <peter.maydell@linaro.org>, Wei Liu <wei.liu@kernel.org>,\n Phil Dennis-Jordan <phil@philjordan.eu>", "Subject": "[PATCH 17/38] whpx: i386: unknown MSR configurability", "Date": "Sun, 19 Apr 2026 00:32:59 +0200", "Message-ID": "<20260418223320.51330-18-mohamed@unpredictable.fr>", "X-Mailer": "git-send-email 2.50.1", "In-Reply-To": "<20260418223320.51330-1-mohamed@unpredictable.fr>", "References": "<20260418223320.51330-1-mohamed@unpredictable.fr>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-Proofpoint-ORIG-GUID": "X8uOZ2NOvbwt4S0PKLmgUNdWFjWuG6Hb", "X-Proofpoint-GUID": "X8uOZ2NOvbwt4S0PKLmgUNdWFjWuG6Hb", "X-Proofpoint-Spam-Details-Enc": "AW1haW4tMjYwNDE4MDIyOCBTYWx0ZWRfX/s5O1QghGj4+\n akGzB9x2JL+q7ZeCKF27hpVmpzdq28M+Lcw+5PM20TKKEgVnaGKAa0Kfnf85GN0POpVzI+wk8w2\n xP/eZLbGvUQ7FnbxdBaHdC1r4M9q+yuNWD5DFypuysKOF97afvzkdFHvGRP2T8hs25d+ONNzQ2x\n 7ShUvMU01HnRRKRoIwDHkC7ySo3hAKVTrxX+sQb8TExdbl0C8WzBJnzlQBvv6MduAM6/lpkixtf\n hL4weVO8dNDDHgF7C2hG3bw/+Yo7JznO9nvsjDqKFoZ562K8eEKNgsH/C7NqssJwPC+pmOow+oF\n TH9WDWCAFVil6mi79kp2jL6ldsDY3LxpPMlohzcAohnGkPCcaZ3y8uHWZogpaw=", "X-Authority-Info-Out": "v=2.4 cv=L78QguT8 c=1 sm=1 tr=0 ts=69e406d5\n cx=c_apl:c_pps:t_out a=YrL12D//S6tul8v/L+6tKg==:117\n a=YrL12D//S6tul8v/L+6tKg==:17 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22\n a=9z_AL-2ZILZrMqfKHsQA:9", "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=2026-04-18_06,2026-04-17_04,2025-10-01_01", "X-Proofpoint-Spam-Details": "rule=notspam policy=default score=0 mlxscore=0\n bulkscore=0 spamscore=0 mlxlogscore=999 suspectscore=0 malwarescore=0\n phishscore=0 lowpriorityscore=0 clxscore=1030 adultscore=0 classifier=spam\n authscore=0 adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000\n definitions=main-2604180228", "Received-SPF": "pass client-ip=57.103.77.174;\n envelope-from=mohamed@unpredictable.fr; helo=outbound.st.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 0d72e93621..550f30d50a 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": [ "17/38" ] }