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GET /api/1.1/patches/2223223/?format=api
{ "id": 2223223, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2223223/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260414182231.18776-8-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": "<20260414182231.18776-8-mohamed@unpredictable.fr>", "date": "2026-04-14T18:22:31", "name": "[7/7] whpx: i386: add HV_X64_MSR_GUEST_IDLE when !kernel-irqchip", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "05ab0afde19950cd5fbc5fd746bb3fcaed8e31d5", "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/20260414182231.18776-8-mohamed@unpredictable.fr/mbox/", "series": [ { "id": 499883, "url": "http://patchwork.ozlabs.org/api/1.1/series/499883/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=499883", "date": "2026-04-14T18:22:24", "name": "whpx: i386: Some more changes", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/499883/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2223223/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2223223/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=JzfW61Zs;\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, 14 Apr 2026 14:22:51 -0400", "from outbound.pv.icloud.com (unknown [127.0.0.2])\n by p00-icloudmta-asmtp-us-west-1a-60-percent-9 (Postfix) with ESMTPS id\n 1CEC01801395; Tue, 14 Apr 2026 18:22:46 +0000 (UTC)", "from localhost.localdomain (unknown [17.56.9.36])\n by p00-icloudmta-asmtp-us-west-1a-60-percent-9 (Postfix) with ESMTPSA id\n 66EAB18001C2; Tue, 14 Apr 2026 18:22:45 +0000 (UTC)" ], "Dkim-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=unpredictable.fr;\n s=sig1; t=1776190968; x=1778782968;\n bh=6lVPI+m1fDykLwqr3FmC9utzBoApYycYAPsCsYijeBQ=;\n h=From:To:Subject:Date:Message-ID:MIME-Version:x-icloud-hme;\n b=JzfW61ZsLVqnaVpKRLOAkzyseZhn/VCpmqqOOGxiNQ0PvcrFWdEHv9Ey3kGonokeYsdMOJgJDJNhYZTN47yfLDhP7fUWiJgzgW+EXGbodqaTz7C6+mjafxGYZsNzzQK8StEnKGwm7GJVjL/SkYlHCD0U9V4/rSRmRBJBwwR/2iqMo6/q+urxkGwByKnbn5Y67/mwJ/4V5WVqzvr5tKqGMAXTIQdm/ZV03feRWmHXcbcfqe3kwbM6Ie3NGOSA7ZMXxIesm7T6I7BEWe/mlbjyHrg02Z+cvs2+SJJ5x9fwlNk8nwym33YDj4+tXBs5jeHYFF4xE126hmIDspYldScx5A==", "mail-alias-created-date": "1752046281608", "From": "Mohamed Mediouni <mohamed@unpredictable.fr>", "To": "qemu-devel@nongnu.org", "Cc": "Pedro Barbuda <pbarbuda@microsoft.com>,\n Mohamed Mediouni <mohamed@unpredictable.fr>,\n Zhao Liu <zhao1.liu@intel.com>, Paolo Bonzini <pbonzini@redhat.com>", "Subject": "[PATCH 7/7] whpx: i386: add HV_X64_MSR_GUEST_IDLE when\n !kernel-irqchip", "Date": "Tue, 14 Apr 2026 20:22:31 +0200", "Message-ID": "<20260414182231.18776-8-mohamed@unpredictable.fr>", "X-Mailer": "git-send-email 2.50.1", "In-Reply-To": "<20260414182231.18776-1-mohamed@unpredictable.fr>", "References": "<20260414182231.18776-1-mohamed@unpredictable.fr>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-Authority-Info-Out": "v=2.4 cv=fuHRpV4f c=1 sm=1 tr=0 ts=69de85f7\n cx=c_apl:c_pps:t_out a=azHRBMxVc17uSn+fyuI/eg==:117\n a=azHRBMxVc17uSn+fyuI/eg==:17 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22\n a=mSEN7FZ2dYRJNo9PPvgA:9", "X-Proofpoint-ORIG-GUID": "FxBd79eiJqztALedvUoGlk5Nlu3ocs-e", "X-Proofpoint-Spam-Details-Enc": "AW1haW4tMjYwNDE0MDE3MiBTYWx0ZWRfX6myu1tomdZox\n hTEYjNabLO/AZB6oGv2F77fR//h/dKHjywXHdbECxgqM23pSOZvjtSECRIwsHehiTaA9MMiV1GI\n po/VuD7HZrLkU+TL7cbXM8K02fSkw/kfijz0b8qv70FmCozrJ4OHEZwfEeuycsq4Sh+MbyaooY/\n kd8Gi0v04LVR0suXIuYa/EgeZLkdtFdqvgEJKzeNVdzMH46DypAyH6lxMysgYV2Om6cA6/HsmP8\n pTji8UmipfZLKnN7IRNIeyORuwMwKM3EZw1t04FC7UEOv1vx4ybpxONRRdex/bhIEtZUU71ZT2D\n PX2r8cKxlRj0SlZGdGwUU9hexc/hn6OIojgM0cV65GBQttbKhjgwEH4ILmS6wg=", "X-Proofpoint-GUID": "FxBd79eiJqztALedvUoGlk5Nlu3ocs-e", "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=2026-04-14_03,2026-04-13_04,2025-10-01_01", "X-Proofpoint-Spam-Details": "rule=notspam policy=default score=0 adultscore=0\n mlxscore=0 spamscore=0 suspectscore=0 lowpriorityscore=0 phishscore=0\n mlxlogscore=999 malwarescore=0 bulkscore=0 clxscore=1030 classifier=spam\n authscore=0 adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000\n definitions=main-2604140172", "Received-SPF": "pass client-ip=57.103.66.241;\n envelope-from=mohamed@unpredictable.fr; helo=outbound.pv.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_VALIDITY_RPBL_BLOCKED=0.001,\n RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_PASS=-0.001,\n 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 support for an oddball HV_X64_MSR_GUEST_IDLE not-quite-an-HLT\nthat wakes the vCPU even if EFLAGS.IF is set.\n\nSigned-off-by: Mohamed Mediouni <mohamed@unpredictable.fr>\n---\n target/i386/whpx/whpx-all.c | 46 +++++++++++++++++++++++++++++++++----\n 1 file changed, 42 insertions(+), 4 deletions(-)", "diff": "diff --git a/target/i386/whpx/whpx-all.c b/target/i386/whpx/whpx-all.c\nindex 2e6679f40b..7a157e6dae 100644\n--- a/target/i386/whpx/whpx-all.c\n+++ b/target/i386/whpx/whpx-all.c\n@@ -52,6 +52,7 @@\n /* for kernel-irqchip=off */\n #define HV_X64_MSR_APIC_FREQUENCY 0x40000023\n #define HV_X64_MSR_VP_ASSIST_PAGE 0x40000073\n+#define HV_X64_MSR_GUEST_IDLE 0x400000f0\n \n static bool is_modern_os = true;\n \n@@ -1543,13 +1544,16 @@ static vaddr whpx_vcpu_get_pc(CPUState *cpu, bool exit_context_valid)\n }\n }\n \n-static int whpx_handle_halt(CPUState *cpu)\n+static int whpx_handle_halt_generic(CPUState *cpu)\n {\n+ X86CPU *x86_cpu = X86_CPU(cpu);\n+ CPUX86State *env = &x86_cpu->env;\n+\n int ret = 0;\n \n bql_lock();\n if (!(cpu_test_interrupt(cpu, CPU_INTERRUPT_HARD) &&\n- (cpu_env(cpu)->eflags & IF_MASK)) &&\n+ ((cpu_env(cpu)->eflags & IF_MASK) || env->hflags2 & HF2_HYPERV_HLT_MASK)) &&\n !cpu_test_interrupt(cpu, CPU_INTERRUPT_NMI)) {\n cpu->exception_index = EXCP_HLT;\n cpu->halted = true;\n@@ -1560,6 +1564,27 @@ static int whpx_handle_halt(CPUState *cpu)\n return ret;\n }\n \n+static int whpx_handle_halt(CPUState *cpu)\n+{\n+ int ret = 0;\n+\n+ ret = whpx_handle_halt_generic(cpu);\n+\n+ return ret;\n+}\n+\n+static int whpx_handle_hyperv_guestidle(CPUState *cpu)\n+{\n+ X86CPU *x86_cpu = X86_CPU(cpu);\n+ CPUX86State *env = &x86_cpu->env;\n+ int ret = 0;\n+\n+ env->hflags2 |= HF2_HYPERV_HLT_MASK;\n+ ret = whpx_handle_halt_generic(cpu);\n+\n+ return ret;\n+}\n+\n static void whpx_vcpu_kick_out_of_hlt(CPUState *cpu) \n {\n WHV_REGISTER_VALUE reg;\n@@ -1631,7 +1656,8 @@ static void whpx_vcpu_pre_run(CPUState *cpu)\n /* Get pending hard interruption or replay one that was overwritten */\n if (!whpx_irqchip_in_kernel()) {\n if (!vcpu->interruption_pending &&\n- vcpu->interruptable && (env->eflags & IF_MASK)\n+ vcpu->interruptable &&\n+ ((env->eflags & IF_MASK) || env->hflags2 & HF2_HYPERV_HLT_MASK)\n && (vcpu->tpr < irr || irr == 0)) {\n assert(!new_int.InterruptionPending);\n if (cpu_test_interrupt(cpu, CPU_INTERRUPT_HARD)) {\n@@ -1763,9 +1789,10 @@ static void whpx_vcpu_process_async_events(CPUState *cpu)\n }\n \n if ((cpu_test_interrupt(cpu, CPU_INTERRUPT_HARD) &&\n- (env->eflags & IF_MASK)) ||\n+ ((env->eflags & IF_MASK) || env->hflags2 & HF2_HYPERV_HLT_MASK)) ||\n cpu_test_interrupt(cpu, CPU_INTERRUPT_NMI)) {\n cpu->halted = false;\n+ env->hflags2 &= ~HF2_HYPERV_HLT_MASK;\n }\n \n if (cpu_test_interrupt(cpu, CPU_INTERRUPT_SIPI)) {\n@@ -2035,6 +2062,17 @@ int whpx_vcpu_run(CPUState *cpu)\n }\n }\n \n+ /* Windows and Linux both use this MSR. */\n+ if (vcpu->exit_ctx.MsrAccess.MsrNumber == HV_X64_MSR_GUEST_IDLE\n+ && !vcpu->exit_ctx.MsrAccess.AccessInfo.IsWrite\n+ && !whpx_irqchip_in_kernel()\n+ && whpx->hyperv_enlightenments_enabled) {\n+ is_known_msr = 1;\n+ whpx_bump_rip(cpu, &vcpu->exit_ctx);\n+ ret = whpx_handle_hyperv_guestidle(cpu);\n+ break;\n+ }\n+\n /*\n * Linux tries to use it anyway even when not exposed. \n * Ignore the write as the VP assist page is not used.\n", "prefixes": [ "7/7" ] }