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GET /api/1.1/patches/2220672/?format=api
{ "id": 2220672, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2220672/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260407151707.46536-5-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": "<20260407151707.46536-5-mohamed@unpredictable.fr>", "date": "2026-04-07T15:16:58", "name": "[v9,04/13] whpx: i386: disable TbFlushHypercalls for emulated LAPIC", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "c8bc98883e288377ddb601331c7229a335473143", "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/20260407151707.46536-5-mohamed@unpredictable.fr/mbox/", "series": [ { "id": 499027, "url": "http://patchwork.ozlabs.org/api/1.1/series/499027/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=499027", "date": "2026-04-07T15:17:06", "name": "whpx: i386: bug fixes, feature probing and CPUID", "version": 9, "mbox": "http://patchwork.ozlabs.org/series/499027/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2220672/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2220672/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=YlBmzMY3;\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, 07 Apr 2026 11:17:49 -0400", "from outbound.st.icloud.com (unknown [127.0.0.2])\n by p00-icloudmta-asmtp-us-east-1a-100-percent-5 (Postfix) with ESMTPS id\n D07F518045F3; Tue, 07 Apr 2026 15:17:44 +0000 (UTC)", "from localhost.localdomain (unknown [17.42.251.67])\n by p00-icloudmta-asmtp-us-east-1a-100-percent-5 (Postfix) with ESMTPSA id\n 887C018013E6; Tue, 07 Apr 2026 15:17:15 +0000 (UTC)" ], "Dkim-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=unpredictable.fr;\n s=sig1; t=1775575067; x=1778167067;\n bh=LeCfULzXVq8eMeXoD4HoazACVFGuCL5m06fQgObX99k=;\n h=From:To:Subject:Date:Message-ID:MIME-Version:x-icloud-hme;\n b=YlBmzMY3jO2ZTnmQ+6dkPAgjqXMlWhptPuUh9DpcwUPqrYz1t55nOIIlbMySDMFg3ySuxgc2IvQ2AoStHysQh8pJm0U5hPQ+zZ4MFXojzi2HRmmbZdKDIf9vIxawd/PTPoVQHGAnk5b3ORM8eOvAiK1YbP2Ia/yW8g9PHdRuyAemyJrOn9u4DNKUjMpTs1tIoge8PSOuqbtufNRff0I8wBfylvymZnNsG41WS3SYFw4teDZ7FKkiFmbAYnmIwGWhnQ6co3jJDK3znMHBf+kua3c+Q5zzzS7nK5NZ/OZp+vb4xIlEsnszeZ/By2IivfNbaIJ6JnAgZFkSrWjqjca1LQ==", "mail-alias-created-date": "1752046281608", "From": "Mohamed Mediouni <mohamed@unpredictable.fr>", "To": "qemu-devel@nongnu.org", "Cc": "Phil Dennis-Jordan <phil@philjordan.eu>,\n Paolo Bonzini <pbonzini@redhat.com>,\n Mohamed Mediouni <mohamed@unpredictable.fr>,\n Zhao Liu <zhao1.liu@intel.com>, Pedro Barbuda <pbarbuda@microsoft.com>,\n Roman Bolshakov <rbolshakov@ddn.com>, Wei Liu <wei.liu@kernel.org>", "Subject": "[PATCH v9 04/13] whpx: i386: disable TbFlushHypercalls for emulated\n LAPIC", "Date": "Tue, 7 Apr 2026 17:16:58 +0200", "Message-ID": "<20260407151707.46536-5-mohamed@unpredictable.fr>", "X-Mailer": "git-send-email 2.50.1", "In-Reply-To": "<20260407151707.46536-1-mohamed@unpredictable.fr>", "References": "<20260407151707.46536-1-mohamed@unpredictable.fr>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-Proofpoint-Spam-Details-Enc": "AW1haW4tMjYwNDA3MDE0MCBTYWx0ZWRfX3zQ1Zs2CPnM2\n z588J6LzXgMU67dcTb4O2PuNTkxs5y5R6ufDrSoBd0DweBdTXd2PWZgvMFUMy3M0k4NoDo0DtOX\n A9R17CUqWQK9IpNLV2Q6wor/0h/mo/ia0MyRFftw7+98OvkOkE1zzgq+5xB4VD4msxxHjGxbo/2\n unO7tr2twdlEmfVGE0vE9VFpHBCI7yRDpvjeh9bvQSVwK93Be89pD+WEv0IXn9ywobccnl2myMO\n LJ2UwlPdWwfUXr1JeH/2g9Gh5PhQ0VsEmZSRXhHFcV6dYZQwD73GtM86AG1TrXPcBkfAW3nkXis\n FF4zx/6bRa+Dk/jR2yvhW33906GjH7nOhJQB4jaQ7Qfy+h/0AGTKGVVfYXtLZw=", "X-Proofpoint-ORIG-GUID": "O7MMdRUIXxK2xtVpxgFrQCKxZZR75XEl", "X-Proofpoint-GUID": "O7MMdRUIXxK2xtVpxgFrQCKxZZR75XEl", "X-Authority-Info-Out": "v=2.4 cv=Z5nh3XRA c=1 sm=1 tr=0 ts=69d52019\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=Rm0zj2O9plGGl-KjdfMA: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=2026-04-07_03,2026-04-07_02,2025-10-01_01", "X-Proofpoint-Spam-Details": "rule=notspam policy=default score=0\n lowpriorityscore=0 malwarescore=0 clxscore=1030 phishscore=0 mlxlogscore=709\n suspectscore=0 spamscore=0 adultscore=0 bulkscore=0 mlxscore=0\n classifier=spam authscore=0 adjust=0 reason=mlx scancount=1\n engine=8.22.0-2601150000 definitions=main-2604070140", "Received-SPF": "pass client-ip=57.103.78.83;\n envelope-from=mohamed@unpredictable.fr; helo=outbound.st.icloud.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,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001,\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": "AccessHypercallRegs was present twice so clean that up.\n\nRemove TbFlushHypercalls (and its extended Gva range sub-feature)\nfrom the user-mode LAPIC case as it behaves oddly there.\n\nSigned-off-by: Mohamed Mediouni <mohamed@unpredictable.fr>\n---\n target/i386/whpx/whpx-all.c | 9 ++++++---\n 1 file changed, 6 insertions(+), 3 deletions(-)", "diff": "diff --git a/target/i386/whpx/whpx-all.c b/target/i386/whpx/whpx-all.c\nindex 2d527b90dd..0908dfd134 100644\n--- a/target/i386/whpx/whpx-all.c\n+++ b/target/i386/whpx/whpx-all.c\n@@ -2489,10 +2489,7 @@ int whpx_accel_init(AccelState *as, MachineState *ms)\n synthetic_features.Bank0.AccessPartitionReferenceTsc = 1;\n synthetic_features.Bank0.AccessHypercallRegs = 1;\n synthetic_features.Bank0.AccessFrequencyRegs = 1;\n- synthetic_features.Bank0.EnableExtendedGvaRangesForFlushVirtualAddressList = 1;\n synthetic_features.Bank0.AccessVpIndex = 1;\n- synthetic_features.Bank0.AccessHypercallRegs = 1;\n- synthetic_features.Bank0.TbFlushHypercalls = 1;\n \n if (whpx_irqchip_in_kernel()) {\n synthetic_features.Bank0.AccessSynicRegs = 1;\n@@ -2500,6 +2497,12 @@ int whpx_accel_init(AccelState *as, MachineState *ms)\n synthetic_features.Bank0.AccessIntrCtrlRegs = 1;\n synthetic_features.Bank0.SyntheticClusterIpi = 1;\n synthetic_features.Bank0.DirectSyntheticTimers = 1;\n+ /*\n+ * These technically work without the Hyper-V LAPIC\n+ * but behave oddly for multi-core VMs.\n+ */\n+ synthetic_features.Bank0.TbFlushHypercalls = 1;\n+ synthetic_features.Bank0.EnableExtendedGvaRangesForFlushVirtualAddressList = 1;\n }\n \n if (is_modern_os && whpx->hyperv_enlightenments_allowed) {\n", "prefixes": [ "v9", "04/13" ] }