{"id":2226934,"url":"http://patchwork.ozlabs.org/api/patches/2226934/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/patch/20260422214225.2242-5-mohamed@unpredictable.fr/","project":{"id":14,"url":"http://patchwork.ozlabs.org/api/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":"","list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<20260422214225.2242-5-mohamed@unpredictable.fr>","list_archive_url":null,"date":"2026-04-22T21:41:52","name":"[v3,04/37] 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/people/91318/?format=json","name":"Mohamed Mediouni","email":"mohamed@unpredictable.fr"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/qemu-devel/patch/20260422214225.2242-5-mohamed@unpredictable.fr/mbox/","series":[{"id":501116,"url":"http://patchwork.ozlabs.org/api/series/501116/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/list/?series=501116","date":"2026-04-22T21:41:48","name":"[v3,01/37] target/i386: emulate: include name of unhandled instruction","version":3,"mbox":"http://patchwork.ozlabs.org/series/501116/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2226934/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2226934/checks/","tags":{},"related":[],"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=ejLVaPZT;\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 4g1CTY5rXBz1yD5\n\tfor ; Thu, 23 Apr 2026 07:46:09 +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 1wFfLK-0007ta-RU; Wed, 22 Apr 2026 17:42:46 -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 1wFfLI-0007sb-2i\n for qemu-devel@nongnu.org; Wed, 22 Apr 2026 17:42:44 -0400","from p-east2-cluster1-host4-snip4-10.eps.apple.com ([57.103.76.23]\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 )\n id 1wFfLF-0006ww-Mf\n for qemu-devel@nongnu.org; Wed, 22 Apr 2026 17:42:43 -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 DBBBE1800227; Wed, 22 Apr 2026 21:42:37 +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 AFE181800232; Wed, 22 Apr 2026 21:42:35 +0000 (UTC)"],"X-ICL-Out-Info":"\n HUtFAUMHWwJACUgBTUQeDx5WFlZNRAJCTQFIHV8DWRxBAUkdXw9LVxQEFVwFVgZXFHkNXR1FDlYZWgxSD1sOHBZLWFUJCgZdGFgVVgl3HlwASx1XBFQfUxJVHR0LRUtAEwRJAU1fDl4fBBdGGVUERx5dVkAZGQJRHFYNV0NUBF9QSQxBUGxaAEcXSB1dGVlvUF0cDhhZG0AVXRFQGVYJXhUXHkFNWgJWTQVKA18BWwZCC0oCWQVZB14LSgdfGl4fHVYQUgBSD3IFVwhBCFMCUQRYGl8IGQ1AThkMSh1SVlEFSgxcAGgPXR1YEV0=","Dkim-Signature":"v=1; a=rsa-sha256; c=relaxed/relaxed; d=unpredictable.fr;\n s=sig1; t=1776894160; x=1779486160;\n bh=V8p4axRuSSeu+sKKMx+ar98eGUS5hUC2c3mtFQ7SVOk=;\n h=From:To:Subject:Date:Message-ID:MIME-Version:x-icloud-hme;\n b=ejLVaPZThiBJvBhld6DZp6xLNk4D97MXP7fxOGrKu6ZskEx8KhlttWIG4feiDn0+OuM5UH4MjLCGeqJIYMJqRwWwskL58rPg5kWQMKXhXFxeO7acoqBU7ZP/h1uguGV3QRT+BH5obFpVmxFr/ClWSBMzLB6DDIsC27WBZDn7k1gb1qVl3bef+hYEomU0navy2zmXImIlA1ULv993tQ4hsGNp5CRuLTieIE3TC2VsEizFa1tBpCk6nUixBVNlYnExSomdShcbwVPhhTg7+OcELOWlNtbWKTAFIlc86Z0i0lW8qWXFYsBJ9EJqhmWnj1+Ftb5lAj/qc2v9lFzghWX4Ow==","mail-alias-created-date":"1752046281608","From":"Mohamed Mediouni ","To":"qemu-devel@nongnu.org","Cc":"Pedro Barbuda , qemu-arm@nongnu.org,\n Pierrick Bouvier ,\n Mohamed Mediouni ,\n Roman Bolshakov ,\n \"Michael S. Tsirkin\" , Wei Liu ,\n Phil Dennis-Jordan ,\n Peter Maydell , Zhao Liu ,\n Paolo Bonzini ","Subject":"[PATCH v3 04/37] whpx: i386: disable TbFlushHypercalls for emulated\n LAPIC","Date":"Wed, 22 Apr 2026 23:41:52 +0200","Message-ID":"<20260422214225.2242-5-mohamed@unpredictable.fr>","X-Mailer":"git-send-email 2.50.1","In-Reply-To":"<20260422214225.2242-1-mohamed@unpredictable.fr>","References":"<20260422214225.2242-1-mohamed@unpredictable.fr>","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","X-Proofpoint-Spam-Details-Enc":"AW1haW4tMjYwNDIyMDIxMSBTYWx0ZWRfX6moWjjXhKEB9\n FnMhwoCJ8VOnV9+MBifVxtdGrMHm58RIonCeQGFnqzjCJOFgUbylAJUnENCeo5/jbd+Xh655G+S\n 0LJQtHbZBwNPd2NMB6J+usbxEXCYntzYHPrftnVmnzPxgRArqYLZ1mlAnNL+LyBexPKpYpJNKrV\n iuGDjHMlO8f3J0uUoO7CzgCAhNycQYdwYism4ggjnOWAzw4lFoJ1xkXnPdLsG8w03fhWyU8SaDd\n ++LRabrnqpsZsBqLxoxUuYu/5ZNQ+ZX+jDpILCzJpaBPgl5PfqOmtDZC7Sq5xebWOMlI7bfoI+f\n eqiQ8T1rqzvMhhbtPU6Ke6IQzSj96STjSWg8LixhbNmTzpmvXzSjZHGCb4mSzM=","X-Authority-Info-Out":"v=2.4 cv=cIbtc1eN c=1 sm=1 tr=0 ts=69e940ce\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-ORIG-GUID":"RhKjumfgKrSSxGXU2T-lGyPICLuSLEW4","X-Proofpoint-GUID":"RhKjumfgKrSSxGXU2T-lGyPICLuSLEW4","Received-SPF":"pass client-ip=57.103.76.23;\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 SPF_HELO_PASS=-0.001,\n SPF_PASS=-0.001 autolearn=unavailable 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 d211b3f2ef..8f03616cb9 100644\n--- a/target/i386/whpx/whpx-all.c\n+++ b/target/i386/whpx/whpx-all.c\n@@ -2577,10 +2577,7 @@ 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@@ -2588,6 +2585,12 @@ 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":["v3","04/37"]}