{"id":2225056,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2225056/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/patch/20260420104248.86702-5-mohamed@unpredictable.fr/","project":{"id":14,"url":"http://patchwork.ozlabs.org/api/1.1/projects/14/?format=json","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":"<20260420104248.86702-5-mohamed@unpredictable.fr>","date":"2026-04-20T10:42:14","name":"[v2,04/38] 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=json","name":"Mohamed Mediouni","email":"mohamed@unpredictable.fr"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/qemu-devel/patch/20260420104248.86702-5-mohamed@unpredictable.fr/mbox/","series":[{"id":500592,"url":"http://patchwork.ozlabs.org/api/1.1/series/500592/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/list/?series=500592","date":"2026-04-20T10:42:10","name":"WHPX x86 updates for QEMU 11.1","version":2,"mbox":"http://patchwork.ozlabs.org/series/500592/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2225056/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2225056/checks/","tags":{},"headers":{"Return-Path":"","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=eMt0dPzo;\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 4fzht22Ss0z1yGs\n\tfor ; Mon, 20 Apr 2026 20:43:37 +1000 (AEST)","from localhost ([::1] helo=lists1p.gnu.org)\n\tby lists1p.gnu.org with esmtp (Exim 4.90_1)\n\t(envelope-from )\n\tid 1wEm5y-0006rd-JX; Mon, 20 Apr 2026 06:43:14 -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 )\n id 1wEm5s-0006q0-CF\n for qemu-devel@nongnu.org; Mon, 20 Apr 2026 06:43:08 -0400","from p-west3-cluster3-host4-snip4-10.eps.apple.com ([57.103.72.191]\n helo=outbound.ms.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 )\n id 1wEm5r-0000Wh-0t\n for qemu-devel@nongnu.org; Mon, 20 Apr 2026 06:43:08 -0400","from outbound.ms.icloud.com (unknown [127.0.0.2])\n by p00-icloudmta-asmtp-us-west-3a-100-percent-1 (Postfix) with ESMTPS id\n 318CF180045A; Mon, 20 Apr 2026 10:43:04 +0000 (UTC)","from localhost.localdomain (unknown [17.57.154.37])\n by p00-icloudmta-asmtp-us-west-3a-100-percent-1 (Postfix) with ESMTPSA id\n 83EB51800466; Mon, 20 Apr 2026 10:43:01 +0000 (UTC)"],"Dkim-Signature":"v=1; a=rsa-sha256; c=relaxed/relaxed; d=unpredictable.fr;\n s=sig1; t=1776681786; x=1779273786;\n bh=LeCfULzXVq8eMeXoD4HoazACVFGuCL5m06fQgObX99k=;\n h=From:To:Subject:Date:Message-ID:MIME-Version:x-icloud-hme;\n b=eMt0dPzoXOM74HRCiK01b4PlSpyzb82oxJxRV2sQ59yAFXu/rahQKjiQGYcwYX+VmYyWpIK5mAfdnsAsk2Wu6QM/zn2ewg1QZEIVj/qPTiLXqxO1H3NmapiNa2er77Oba4+OTwnOxFvYZGIPym/4neEmtsMN5Pt67yGXwVsdb7fWRxEuKLQ+RLYxoet7raYnh7O8kSLt89vwDfHgbpqo/gBG8kn2lKVANSZj1Bd9C+ThAIo/8TvRJ5sTSPj+GzyF6/ttc/kFQL4210WstLo1kQ8OJ2UPY5AFtDbEyxtiZ3EEu4gtIkYptHvmzaQNuBaJB2v0j5kMOUOby6ls3364PA==","mail-alias-created-date":"1752046281608","From":"Mohamed Mediouni ","To":"qemu-devel@nongnu.org","Cc":"qemu-arm@nongnu.org, Mohamed Mediouni ,\n Paolo Bonzini ,\n Phil Dennis-Jordan ,\n Roman Bolshakov ,\n Pierrick Bouvier ,\n Pedro Barbuda , Wei Liu ,\n \"Michael S. Tsirkin\" ,\n Peter Maydell , Zhao Liu ","Subject":"[PATCH v2 04/38] whpx: i386: disable TbFlushHypercalls for emulated\n LAPIC","Date":"Mon, 20 Apr 2026 12:42:14 +0200","Message-ID":"<20260420104248.86702-5-mohamed@unpredictable.fr>","X-Mailer":"git-send-email 2.50.1","In-Reply-To":"<20260420104248.86702-1-mohamed@unpredictable.fr>","References":"<20260420104248.86702-1-mohamed@unpredictable.fr>","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","X-Proofpoint-GUID":"vD2UKpINrLvOxGClEngNk6w-aaqxV7Ky","X-Proofpoint-Spam-Details-Enc":"AW1haW4tMjYwNDIwMDEwNCBTYWx0ZWRfX9PRK9R7HixMk\n oIXN+I2rx004icuPsv1GRzPAcbaHnBpWNkGHaRNinHPEK//VWyvdP4xj+bilgjhDvLlfvN35bc8\n 3V4QsH7Pv+Yh9jIO6YOjxD2Tw937F2tMwFLegG5BE5NBzAXuFiNcQ+7x8Y4nebD91uIwz/X5adE\n GrBvFv1ejdO2zCak74mbN4pW7ceLwArio2wEtPMRDymXgxY5oUR6sxROqaEVGFGoTeVf1NOAbWv\n YFzzmvNtjcO5n43t1ss+sQElZdbEc12qIoDRDm0rjOeJRpVpjJdIj4GIJyVVtepzNFP9eOi9qZt\n v9UTqETeqKcGPUTHyfCZgLsN9yZXuWLT70TSm64ceVKrI/Kf/+3FrNEM/YjO2g=","X-Authority-Info-Out":"v=2.4 cv=XaGEDY55 c=1 sm=1 tr=0 ts=69e60339\n cx=c_apl:c_pps:t_out a=qkKslKyYc0ctBTeLUVfTFg==:117 a=A5OVakUREuEA:10\n a=VkNPw1HP01LnGYTKEx00:22 a=Rm0zj2O9plGGl-KjdfMA:9","X-Proofpoint-ORIG-GUID":"vD2UKpINrLvOxGClEngNk6w-aaqxV7Ky","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=2026-04-20_02,2026-04-17_04,2025-10-01_01","X-Proofpoint-Spam-Details":"rule=notspam policy=default score=0 spamscore=0\n malwarescore=0 suspectscore=0 adultscore=0 mlxlogscore=777 phishscore=0\n bulkscore=0 mlxscore=0 clxscore=1030 lowpriorityscore=0 classifier=spam\n authscore=0 adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000\n definitions=main-2604200104","Received-SPF":"pass client-ip=57.103.72.191;\n envelope-from=mohamed@unpredictable.fr; helo=outbound.ms.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_H3=0.001, RCVD_IN_MSPIKE_WL=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 ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","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 \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":["v2","04/38"]}