From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists1p.gnu.org (lists1p.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 7B581FA1FFC for ; Wed, 22 Apr 2026 21:47:36 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists1p.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1wFfLr-0008Nm-Q6; Wed, 22 Apr 2026 17:43:19 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists1p.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1wFfLp-0008Ft-6O for qemu-arm@nongnu.org; Wed, 22 Apr 2026 17:43:17 -0400 Received: from p-east2-cluster1-host11-snip4-2.eps.apple.com ([57.103.76.45] helo=outbound.st.icloud.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1wFfLn-0007PD-GA for qemu-arm@nongnu.org; Wed, 22 Apr 2026 17:43:16 -0400 Received: from outbound.st.icloud.com (unknown [127.0.0.2]) by p00-icloudmta-asmtp-us-east-1a-100-percent-1 (Postfix) with ESMTPS id 481531800951; Wed, 22 Apr 2026 21:43:11 +0000 (UTC) X-ICL-Out-Info: HUtFAUMHWwJACUgBTUQeDx5WFlZNRAJCTQFIHV8DWRxBAUkdXw9LVxQEFVwFVgZXFHkNXR1FDlYZWgxSD1sOHBZLWFUJCgZdGFgVVgl3HlwASx1XBFQfUxJVHR0LRUtAEwRJAU1fDl4fBBdGGVUERx5dVkAZGQJRHFYNV0NUBF9QSQxBUGxaAEcXSB1dGVlvUF0cDhhZG0AVXRFQGVYJXhUXHkFNWgJWTQVKA18BWwZCC0oCWQVZB14LSgdfGlkBXVQXWwxaDlYwTBZDH1IPWxNNGVEBUkVUAgdYRxRHDg8TTAtHAlo0Vh9UGVoD Dkim-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=unpredictable.fr; s=sig1; t=1776894194; x=1779486194; bh=YHkuVnpzX5n//Dg7yBbo00rWen0/V/dFS7/fQ041cHE=; h=From:To:Subject:Date:Message-ID:MIME-Version:x-icloud-hme; b=dKcY0fb3KVSd0W5I0YxVNQXJI/bxpuVyi3/imm26XaPn98a81iRRw0dOUE4aBnMkIubANS28PSMqNyZrCBA0pM/JFpE4QXcpRIHAPLImx45Md8wjZzkjnoHGfBRQxPwX3qqdlnJD+TDhoVZ/2pEOYy9iC4JQw2uQM4ecXiIKZO9HB5DObg1gCKE2DQC6ARxv0Pr5toKU4Cwc9EKxWcA7NQ9n9Y42pOAAvEJn7OXevq93e4gL8NwAHSV/f8eiqP8ExRHAFnkfsvQAwKWl6hMJ49HJnucpsqpigUnRMXpVTF77Q/di0FYQ7VZSgPLOFpPgKkemLSSst95b5MdgmICWdg== mail-alias-created-date: 1752046281608 Received: from localhost.localdomain (unknown [17.42.251.67]) by p00-icloudmta-asmtp-us-east-1a-100-percent-1 (Postfix) with ESMTPSA id 1F07C180021C; Wed, 22 Apr 2026 21:43:09 +0000 (UTC) From: Mohamed Mediouni To: qemu-devel@nongnu.org Cc: Pedro Barbuda , qemu-arm@nongnu.org, Pierrick Bouvier , Mohamed Mediouni , Roman Bolshakov , "Michael S. Tsirkin" , Wei Liu , Phil Dennis-Jordan , Peter Maydell , Zhao Liu , Paolo Bonzini Subject: [PATCH v3 22/37] whpx: i386: add HV_X64_MSR_GUEST_IDLE when !kernel-irqchip Date: Wed, 22 Apr 2026 23:42:10 +0200 Message-ID: <20260422214225.2242-23-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-GUID: m9g-lEtEjFVIUQr6zWpTvE6K5sgoJH9B X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDIyMDIxMiBTYWx0ZWRfX3M+Y4peERC38 7TSnI8/XOW1AbsHICKYBKhc4uwQx/QURAOJWV1F2QoDjkKPgG0eitBMp9a1zhTavTEgSF47YcG2 gbwue877SPgBfmfT3sE15jWi7Ru25yn29lD2J4YH+0x83tl1BNZfv72pBzPS3DMNgs3e9iXG8mV SZHfLkvdKlPSl91bp3OXvUjerc0qwbNr//Obp5fOdDeGjbibN4Fd5vm/BZOnlu0Rul0eshjq24F F6XSVbKC1m52KyLKyNgeHwlo6RUeIgRCWU7/2giN5qZp/PikdxTqdzcwQzUU+LVZOI/cvxNKelM zs3g5B9UF+iN4HphZ38RbxMbqwBEEJ/T/oIduYSVzqUlXAogMYJeOA+6tXrRUk= X-Proofpoint-ORIG-GUID: m9g-lEtEjFVIUQr6zWpTvE6K5sgoJH9B X-Authority-Info-Out: v=2.4 cv=VZL6/Vp9 c=1 sm=1 tr=0 ts=69e940f0 cx=c_apl:c_pps:t_out a=YrL12D//S6tul8v/L+6tKg==:117 a=YrL12D//S6tul8v/L+6tKg==:17 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=mSEN7FZ2dYRJNo9PPvgA:9 Received-SPF: pass client-ip=57.103.76.45; 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, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-arm@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-arm-bounces+qemu-arm=archiver.kernel.org@nongnu.org Sender: qemu-arm-bounces+qemu-arm=archiver.kernel.org@nongnu.org Add support for an oddball HV_X64_MSR_GUEST_IDLE not-quite-an-HLT that wakes the vCPU even if EFLAGS.IF is set. Signed-off-by: Mohamed Mediouni --- target/i386/whpx/whpx-all.c | 46 ++++++++++++++++++++++++++++++++++--- 1 file changed, 43 insertions(+), 3 deletions(-) diff --git a/target/i386/whpx/whpx-all.c b/target/i386/whpx/whpx-all.c index cafcbf8bbb..f03f5a5115 100644 --- a/target/i386/whpx/whpx-all.c +++ b/target/i386/whpx/whpx-all.c @@ -52,6 +52,7 @@ /* for kernel-irqchip=off */ #define HV_X64_MSR_APIC_FREQUENCY 0x40000023 #define HV_X64_MSR_VP_ASSIST_PAGE 0x40000073 +#define HV_X64_MSR_GUEST_IDLE 0x400000f0 static bool is_modern_os = true; @@ -1628,13 +1629,16 @@ static vaddr whpx_vcpu_get_pc(CPUState *cpu, bool exit_context_valid) } } -static int whpx_handle_halt(CPUState *cpu) +static int whpx_handle_halt_generic(CPUState *cpu) { + X86CPU *x86_cpu = X86_CPU(cpu); + CPUX86State *env = &x86_cpu->env; + int ret = 0; bql_lock(); if (!(cpu_test_interrupt(cpu, CPU_INTERRUPT_HARD) && - (cpu_env(cpu)->eflags & IF_MASK)) && + ((cpu_env(cpu)->eflags & IF_MASK) || env->hflags2 & HF2_HYPERV_HLT_MASK)) && !cpu_test_interrupt(cpu, CPU_INTERRUPT_NMI)) { cpu->exception_index = EXCP_HLT; cpu->halted = true; @@ -1645,6 +1649,27 @@ static int whpx_handle_halt(CPUState *cpu) return ret; } +static int whpx_handle_halt(CPUState *cpu) +{ + int ret = 0; + + ret = whpx_handle_halt_generic(cpu); + + return ret; +} + +static int whpx_handle_hyperv_guestidle(CPUState *cpu) +{ + X86CPU *x86_cpu = X86_CPU(cpu); + CPUX86State *env = &x86_cpu->env; + int ret = 0; + + env->hflags2 |= HF2_HYPERV_HLT_MASK; + ret = whpx_handle_halt_generic(cpu); + + return ret; +} + static void whpx_vcpu_kick_out_of_hlt(CPUState *cpu) { WHV_REGISTER_VALUE reg; @@ -1848,9 +1873,10 @@ static void whpx_vcpu_process_async_events(CPUState *cpu) } if ((cpu_test_interrupt(cpu, CPU_INTERRUPT_HARD) && - (env->eflags & IF_MASK)) || + ((env->eflags & IF_MASK) || env->hflags2 & HF2_HYPERV_HLT_MASK)) || cpu_test_interrupt(cpu, CPU_INTERRUPT_NMI)) { cpu->halted = false; + env->hflags2 &= ~HF2_HYPERV_HLT_MASK; } if (cpu_test_interrupt(cpu, CPU_INTERRUPT_SIPI)) { @@ -2120,6 +2146,20 @@ int whpx_vcpu_run(CPUState *cpu) } } + /* + * Windows and Linux both use this MSR. + * Windows 11 25H2 uses it even when not advertised. + */ + if (vcpu->exit_ctx.MsrAccess.MsrNumber == HV_X64_MSR_GUEST_IDLE + && !vcpu->exit_ctx.MsrAccess.AccessInfo.IsWrite + && !whpx_irqchip_in_kernel() + && whpx->hyperv_enlightenments_enabled) { + is_known_msr = 1; + whpx_bump_rip(cpu, &vcpu->exit_ctx); + ret = whpx_handle_hyperv_guestidle(cpu); + break; + } + /* * Linux tries to use it anyway even when not exposed. * Ignore the write as the VP assist page is not used. -- 2.50.1 (Apple Git-155)