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GET /api/1.0/patches/2218939/?format=api
{ "id": 2218939, "url": "http://patchwork.ozlabs.org/api/1.0/patches/2218939/?format=api", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/1.0/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": "<20260402053326.23402-5-mohamed@unpredictable.fr>", "date": "2026-04-02T05:33:26", "name": "[4/4] whpx: i386: disable TbFlushHypercalls for emulated LAPIC", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "d4927b95b3bfbd09235912b86c12f0a8cdfbf418", "submitter": { "id": 91318, "url": "http://patchwork.ozlabs.org/api/1.0/people/91318/?format=api", "name": "Mohamed Mediouni", "email": "mohamed@unpredictable.fr" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260402053326.23402-5-mohamed@unpredictable.fr/mbox/", "series": [ { "id": 498430, "url": "http://patchwork.ozlabs.org/api/1.0/series/498430/?format=api", "date": "2026-04-02T05:33:22", "name": "whpx: i386: x2apic emulation for kernel-irqchip=off, feature probing", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/498430/mbox/" } ], "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2218939/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=JaNJcyDj;\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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Thu, 02 Apr 2026 01:33:38 -0400", "from outbound.qs.icloud.com (unknown [127.0.0.2])\n by p00-icloudmta-asmtp-us-east-2d-100-percent-0 (Postfix) with ESMTPS id\n 772E01800362; Thu, 02 Apr 2026 05:33:35 +0000 (UTC)", "from localhost.localdomain (unknown [17.57.155.37])\n by p00-icloudmta-asmtp-us-east-2d-100-percent-0 (Postfix) with ESMTPSA id\n 23BE4180014F; Thu, 02 Apr 2026 05:33:34 +0000 (UTC)" ], "Dkim-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=unpredictable.fr;\n s=sig1; t=1775108016; x=1777700016;\n bh=p8Ht1Vtnjq43JgQ012CwajYz46XQWZEmBTZmC9qxFcc=;\n h=From:To:Subject:Date:Message-ID:MIME-Version:x-icloud-hme;\n b=JaNJcyDjFgJx/vS4HiQE8DJ+sxzr+NeUNdM5NMf4i3uWgsmie0DAi1ymB3FUV04/hAeWJbw63qc7MIQNVMrZrYgBhW+HRjEp+1HA9j8GvusMRmuhheXU6g3UMzdt/j/OzMH1XsmLTJXLAkaKDATV2sM2gL40l9E6/6MGjI2WORnFqSaVdjQQp+7oToE5bGJKErNa9nry9rVcomI61QaljE65L1ntCDTLyZRjm44fVnX3EG8KlfUiJq6VZspZat3jSx8F1EcRiUZsI589z8t0h/BbUID6AywNX+rZzBFD1pq9eUkyG42xcRzv5f6p9DoIJ3DFPb/lP0n1vPNLgMWVUA==", "mail-alias-created-date": "1752046281608", "From": "Mohamed Mediouni <mohamed@unpredictable.fr>", "To": "qemu-devel@nongnu.org", "Cc": "Wei Liu <wei.liu@kernel.org>, Roman Bolshakov <rbolshakov@ddn.com>,\n Pedro Barbuda <pbarbuda@microsoft.com>, Zhao Liu <zhao1.liu@intel.com>,\n Paolo Bonzini <pbonzini@redhat.com>,\n Mohamed Mediouni <mohamed@unpredictable.fr>,\n Phil Dennis-Jordan <phil@philjordan.eu>", "Subject": "[PATCH 4/4] whpx: i386: disable TbFlushHypercalls for emulated LAPIC", "Date": "Thu, 2 Apr 2026 07:33:26 +0200", "Message-ID": "<20260402053326.23402-5-mohamed@unpredictable.fr>", "X-Mailer": "git-send-email 2.50.1", "In-Reply-To": "<20260402053326.23402-1-mohamed@unpredictable.fr>", "References": "<20260402053326.23402-1-mohamed@unpredictable.fr>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-Proofpoint-GUID": "9_gExml200nmPLFrxirgFaEf07HJay3J", "X-Authority-Info-Out": "v=2.4 cv=JJA2csKb c=1 sm=1 tr=0 ts=69cdffaf\n cx=c_apl:c_pps:t_out a=bsP7O+dXZ5uKcj+dsLqiMw==:117\n a=bsP7O+dXZ5uKcj+dsLqiMw==:17 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22\n a=Rm0zj2O9plGGl-KjdfMA:9", "X-Proofpoint-ORIG-GUID": "9_gExml200nmPLFrxirgFaEf07HJay3J", "X-Proofpoint-Spam-Details-Enc": "AW1haW4tMjYwNDAyMDA0NyBTYWx0ZWRfX+WGPm+KSTZL9\n S6HYTYTLGNMhOfroysvl0FUhim+zyXSUnEyqzXIn0OQqGWKgicQ0pmt191WVgm5xCFop0R7vFbc\n ueQzY2vD/8WrmLlEj8wmGIpPGnJ8zlEpq5KIk8i4BfDDf8qcUMIEAIcfSTh1WjztzHOnzvm6CkK\n YNHqBf/YdZetzr1aaa6OfaUcHJS/1Fp0cKG/QOU30deBfZZTxOxUlJzJjrZ2gkyH6kvUNLUyCLi\n 0EcWDI6ZwBSPliVQdS65+RKbpgsRwOVCPE/LXc9KCbTUF0xIDe07mye+Ci78cUhKPNgWr8If11T\n WxSMOkXROGuS5C4Dru8PWJMheQ9iRROAAJ4MJvqyTTtB1ZX9Oq9AhNFC5uEDVQ=", "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=2026-04-02_01,2026-04-01_02,2025-10-01_01", "X-Proofpoint-Spam-Details": "rule=notspam policy=default score=0 mlxlogscore=734\n spamscore=0 suspectscore=0 lowpriorityscore=0\n clxscore=1030 mlxscore=0\n malwarescore=0 bulkscore=0 adultscore=0 phishscore=0 classifier=spam\n authscore=0 adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000\n definitions=main-2604020047", "Received-SPF": "pass client-ip=57.103.84.153;\n envelope-from=mohamed@unpredictable.fr; helo=outbound.qs.icloud.com", "X-Spam_score_int": "0", "X-Spam_score": "-0.1", "X-Spam_bar": "/", "X-Spam_report": "(-0.1 / 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_CERTIFIED_BLOCKED=1, RCVD_IN_VALIDITY_RPBL_BLOCKED=1,\n SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=no 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 ad5ec3e700..b29f8d43c9 100644\n--- a/target/i386/whpx/whpx-all.c\n+++ b/target/i386/whpx/whpx-all.c\n@@ -2477,10 +2477,7 @@ 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@@ -2488,6 +2485,12 @@ 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_legacy_os && whpx->hyperv_enlightenments_allowed) {\n", "prefixes": [ "4/4" ] }