From nobody Mon Jan 26 09:19:02 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass(p=quarantine dis=none) header.from=suse.com ARC-Seal: i=1; a=rsa-sha256; t=1768398287; cv=none; d=zohomail.com; s=zohoarc; b=Qe6J/B77XYlWmGEBu1AJUq3WEDMRKRpKtOQFiBEbvLwhd8xoZD5SbCA5lCqWmUpX/4KdSqPdYW2DbSoeYK1lfhkWukQk8VPODkWcoESd7traQ7JE0k37KC9ZKVmfZkfgj5ZYODKIGVfhQfOW+2BWrEyqGt/+3ffpN7DUfyk6cS4= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1768398287; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=OMhFYAP0uDgitdjy3newUKs3PAfrZxLBZ1KDOJga+EI=; b=MkTs0GH2pd8eEmShuUynCQ12YdIUpZrp/2LbFgaO6WWBzENGi9JIvQDMJYm7bVeRTa+BfQYWHKL7DESPHKanPeyrjKPpSazYmLahwkfQYWQpMYeq2vP6KSk04FLwtvUEXpd4QfR4B8E1LRoFUUvSJr2bCLemy7RI+kyEBg+Z16I= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass header.from= (p=quarantine dis=none) Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 1768398287375483.28640876763154; Wed, 14 Jan 2026 05:44:47 -0800 (PST) Received: from list by lists.xenproject.org with outflank-mailman.1203114.1518409 (Exim 4.92) (envelope-from ) id 1vg1Al-0002vZ-Jb; Wed, 14 Jan 2026 13:44:31 +0000 Received: by outflank-mailman (output) from mailman id 1203114.1518409; Wed, 14 Jan 2026 13:44:31 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1vg1Al-0002vS-H7; Wed, 14 Jan 2026 13:44:31 +0000 Received: by outflank-mailman (input) for mailman id 1203114; Wed, 14 Jan 2026 13:44:30 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1vg1Ak-0001vr-5Z for xen-devel@lists.xenproject.org; Wed, 14 Jan 2026 13:44:30 +0000 Received: from mail-wm1-x335.google.com (mail-wm1-x335.google.com [2a00:1450:4864:20::335]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id 25ed765f-f14f-11f0-b15e-2bf370ae4941; Wed, 14 Jan 2026 14:44:29 +0100 (CET) Received: by mail-wm1-x335.google.com with SMTP id 5b1f17b1804b1-47775fb6cb4so48164515e9.0 for ; Wed, 14 Jan 2026 05:44:29 -0800 (PST) Received: from [10.156.60.236] (ip-037-024-206-209.um08.pools.vodafone-ip.de. [37.24.206.209]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-47ee2840b7csm19538585e9.14.2026.01.14.05.44.28 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 14 Jan 2026 05:44:28 -0800 (PST) X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 25ed765f-f14f-11f0-b15e-2bf370ae4941 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=google; t=1768398269; x=1769003069; darn=lists.xenproject.org; h=content-transfer-encoding:in-reply-to:autocrypt:content-language :references:cc:to:from:subject:user-agent:mime-version:date :message-id:from:to:cc:subject:date:message-id:reply-to; bh=OMhFYAP0uDgitdjy3newUKs3PAfrZxLBZ1KDOJga+EI=; b=U/UtIQeH6aAFX4hC3pA0zQZyIGoyag/vbmKRG2IwPWLwQ/0pJvte7QU2twxt9Es2GS lLnSlmj165HiaT+FFFsvYfUz+Kp35pAuvSuMKOBSdlz28ctftygXz2PZMxlIJZE6QAY7 Nru6OW6DpSeq5m59HthDIHk61JstIwuqrx1plxQ62v6MMdB5vcKeaUf14zs0ZbFXGzh5 hQnNOyxcoPtOA2mnBts6wtfvtFRfBrK8+NWRb1ihKE2M8q6q92ljrj7+HxGiMBTuzk7m IhSLXixQqv4fjfOXaeYx2TuLqgU2LO+oUmq0/zdQIZ194yLp7PHfYLbVW+HZUqBillvY pDJQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1768398269; x=1769003069; h=content-transfer-encoding:in-reply-to:autocrypt:content-language :references:cc:to:from:subject:user-agent:mime-version:date :message-id:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=OMhFYAP0uDgitdjy3newUKs3PAfrZxLBZ1KDOJga+EI=; b=FwCUfIIxegCveutiEwvI/S8YAwTryohKpoVbCbpBj+jCW9RrhGOex1hJXdOJniLIBX ny8th1yRchLxGmAUrBdR19b86eYTgU97/+aj1z0bHn5wR14ChFbocb/FAn3BnhXnuNPo nS/Kga43m9E6vRDVfovV1h7mmH7SInMGUwGx4BFcqoGLL/gioNJ1s0NyS88iGvBo93Cu aLhrS/DANkBx9tys0qKmKbed5Oy3px4YKKYn/KKIddpn1E7L0a/di3wm8Mpt68mDgrUR htEYtkvF7NL5UX66/3XDbU+w8IJW5U3azMiH8ZZ/Szq9jFMSovGKczU3rQSxFRDJ5t6f yAAg== X-Gm-Message-State: AOJu0YwIMDADAmFQrfH0HB/KKUBX59c20wGXSaSFHsoiq4CGN8vAean7 qm/6Y+ICx39+FSUrE0QOcht1oH8+9MzNERTlD+K3npQlgIIq8t9BwIXJ5L8e3sWIi38XlSf8rkN qMQQ= X-Gm-Gg: AY/fxX7wA4M36/ZZ26CFb9UTYa+UZTMeornYW1+LJhSIRrxx/Ap2X8sGVqkrmm8QIpR wp1v1nokodNZpiDMP/+/+GX9r3zpw1wjeWq68gteyKTNGo09xpdEcM4/Mso9rFiT/DaFOLn7IP0 Z1jLI28HiqPNa0hZUEOwJTAWHJcILEQ86UXY7cc2oo4dEeI4YhxFsmZMG9jy8IDmqvwBNMU6osh xwT70/P56YDwX4wrjJH+xBhpbmXRBMQeJ/yv2f7jnRsSMYwxPNH2rBsxSSjfJiKyZNV9mRvVtBI aKXZo1nTlez7hmvwAt2bqOzDGIHpFdLaTms89VaPCiviFmEos64+Dw6LVJoTrjaHrJoMH2oQpLJ +q4HmySAdeQDBaq7DHpzTvGuXTmXdx1txIEx2ftQ2+TRQau6g7sOtdsGSFBRxQbE954Fjwd9+9Y lZjtcaePU28WlGc8w1S3NQVrpS/7oefRPEyALsziIODRSKH590vjTZIM9oczIgnpyw+HOcnKx0y 30= X-Received: by 2002:a05:600c:8289:b0:47e:de23:dd6f with SMTP id 5b1f17b1804b1-47ee33441c9mr28442215e9.12.1768398268726; Wed, 14 Jan 2026 05:44:28 -0800 (PST) Message-ID: <9d7de9e6-11ef-4cd5-94e1-4c1829ea94a3@suse.com> Date: Wed, 14 Jan 2026 14:44:28 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: [PATCH v3 3/6] x86: rename ARAT feature flag From: Jan Beulich To: "xen-devel@lists.xenproject.org" Cc: Andrew Cooper , =?UTF-8?Q?Roger_Pau_Monn=C3=A9?= References: <4d3a3576-2d3c-42ec-8551-18f1f0982e17@suse.com> Content-Language: en-US Autocrypt: addr=jbeulich@suse.com; keydata= xsDiBFk3nEQRBADAEaSw6zC/EJkiwGPXbWtPxl2xCdSoeepS07jW8UgcHNurfHvUzogEq5xk hu507c3BarVjyWCJOylMNR98Yd8VqD9UfmX0Hb8/BrA+Hl6/DB/eqGptrf4BSRwcZQM32aZK 7Pj2XbGWIUrZrd70x1eAP9QE3P79Y2oLrsCgbZJfEwCgvz9JjGmQqQkRiTVzlZVCJYcyGGsD /0tbFCzD2h20ahe8rC1gbb3K3qk+LpBtvjBu1RY9drYk0NymiGbJWZgab6t1jM7sk2vuf0Py O9Hf9XBmK0uE9IgMaiCpc32XV9oASz6UJebwkX+zF2jG5I1BfnO9g7KlotcA/v5ClMjgo6Gl MDY4HxoSRu3i1cqqSDtVlt+AOVBJBACrZcnHAUSuCXBPy0jOlBhxPqRWv6ND4c9PH1xjQ3NP nxJuMBS8rnNg22uyfAgmBKNLpLgAGVRMZGaGoJObGf72s6TeIqKJo/LtggAS9qAUiuKVnygo 3wjfkS9A3DRO+SpU7JqWdsveeIQyeyEJ/8PTowmSQLakF+3fote9ybzd880fSmFuIEJldWxp Y2ggPGpiZXVsaWNoQHN1c2UuY29tPsJgBBMRAgAgBQJZN5xEAhsDBgsJCAcDAgQVAggDBBYC AwECHgECF4AACgkQoDSui/t3IH4J+wCfQ5jHdEjCRHj23O/5ttg9r9OIruwAn3103WUITZee e7Sbg12UgcQ5lv7SzsFNBFk3nEQQCACCuTjCjFOUdi5Nm244F+78kLghRcin/awv+IrTcIWF hUpSs1Y91iQQ7KItirz5uwCPlwejSJDQJLIS+QtJHaXDXeV6NI0Uef1hP20+y8qydDiVkv6l IreXjTb7DvksRgJNvCkWtYnlS3mYvQ9NzS9PhyALWbXnH6sIJd2O9lKS1Mrfq+y0IXCP10eS FFGg+Av3IQeFatkJAyju0PPthyTqxSI4lZYuJVPknzgaeuJv/2NccrPvmeDg6Coe7ZIeQ8Yj t0ARxu2xytAkkLCel1Lz1WLmwLstV30g80nkgZf/wr+/BXJW/oIvRlonUkxv+IbBM3dX2OV8 AmRv1ySWPTP7AAMFB/9PQK/VtlNUJvg8GXj9ootzrteGfVZVVT4XBJkfwBcpC/XcPzldjv+3 HYudvpdNK3lLujXeA5fLOH+Z/G9WBc5pFVSMocI71I8bT8lIAzreg0WvkWg5V2WZsUMlnDL9 mpwIGFhlbM3gfDMs7MPMu8YQRFVdUvtSpaAs8OFfGQ0ia3LGZcjA6Ik2+xcqscEJzNH+qh8V m5jjp28yZgaqTaRbg3M/+MTbMpicpZuqF4rnB0AQD12/3BNWDR6bmh+EkYSMcEIpQmBM51qM EKYTQGybRCjpnKHGOxG0rfFY1085mBDZCH5Kx0cl0HVJuQKC+dV2ZY5AqjcKwAxpE75MLFkr wkkEGBECAAkFAlk3nEQCGwwACgkQoDSui/t3IH7nnwCfcJWUDUFKdCsBH/E5d+0ZnMQi+G0A nAuWpQkjM1ASeQwSHEeAWPgskBQL In-Reply-To: <4d3a3576-2d3c-42ec-8551-18f1f0982e17@suse.com> Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @suse.com) X-ZM-MESSAGEID: 1768398288330158500 Content-Type: text/plain; charset="utf-8" Add a XEN infix, to properly distinguish it from the CPUID feature flag (leaf 6 EAX bit 2). Signed-off-by: Jan Beulich Reviewed-by: Jason Andryuk --- Question is whether we still need opt_arat (and the command line option), or whether we could go directly from the CPUID bit (overriding it to 1 for older AMD [and Hygon?] CPUs). Or whether to have opt_arat affect the (host) CPU policy directly. --- a/xen/arch/x86/acpi/cpu_idle.c +++ b/xen/arch/x86/acpi/cpu_idle.c @@ -109,7 +109,7 @@ void (*__read_mostly lapic_timer_on)(voi =20 bool lapic_timer_init(void) { - if ( boot_cpu_has(X86_FEATURE_ARAT) ) + if ( boot_cpu_has(X86_FEATURE_XEN_ARAT) ) { lapic_timer_off =3D lapic_timer_nop; lapic_timer_on =3D lapic_timer_nop; @@ -1463,7 +1463,7 @@ static void amd_cpuidle_init(struct acpi =20 if ( !vendor_override ) { - if ( !boot_cpu_has(X86_FEATURE_ARAT) ) + if ( !boot_cpu_has(X86_FEATURE_XEN_ARAT) ) hpet_broadcast_init(); =20 if ( !lapic_timer_init() ) --- a/xen/arch/x86/cpu/amd.c +++ b/xen/arch/x86/cpu/amd.c @@ -1239,7 +1239,7 @@ static void cf_check init_amd(struct cpu * running in deep C states. */ if ( opt_arat && c->x86 > 0x11 ) - __set_bit(X86_FEATURE_ARAT, c->x86_capability); + __set_bit(X86_FEATURE_XEN_ARAT, c->x86_capability); =20 /* * Prior to Family 0x14, perf counters are not reset during warm reboot. --- a/xen/arch/x86/cpu/hygon.c +++ b/xen/arch/x86/cpu/hygon.c @@ -81,7 +81,7 @@ static void cf_check init_hygon(struct c =20 /* Hygon processors have APIC timer running in deep C states. */ if (opt_arat) - __set_bit(X86_FEATURE_ARAT, c->x86_capability); + __set_bit(X86_FEATURE_XEN_ARAT, c->x86_capability); =20 if (cpu_has(c, X86_FEATURE_EFRO)) { rdmsrl(MSR_K8_HWCR, value); --- a/xen/arch/x86/cpu/intel.c +++ b/xen/arch/x86/cpu/intel.c @@ -668,7 +668,7 @@ static void cf_check init_intel(struct c if ( opt_arat && ( c->cpuid_level >=3D 0x00000006 ) && ( cpuid_eax(0x00000006) & (1u<<2) ) ) - __set_bit(X86_FEATURE_ARAT, c->x86_capability); + __set_bit(X86_FEATURE_XEN_ARAT, c->x86_capability); =20 if ((opt_cpu_info && !(c->apicid & (c->x86_num_siblings - 1))) || c =3D=3D &boot_cpu_data ) --- a/xen/arch/x86/cpu/mwait-idle.c +++ b/xen/arch/x86/cpu/mwait-idle.c @@ -1633,7 +1633,7 @@ static int __init mwait_idle_probe(void) icpu =3D id->driver_data; cpuidle_state_table =3D icpu->state_table; =20 - if (boot_cpu_has(X86_FEATURE_ARAT)) + if (boot_cpu_has(X86_FEATURE_XEN_ARAT)) lapic_timer_reliable_states =3D LAPIC_TIMER_ALWAYS_RELIABLE; =20 pr_debug(PREFIX "v" MWAIT_IDLE_VERSION " model %#x\n", @@ -1792,7 +1792,7 @@ int __init mwait_idle_init(struct notifi return -ENODEV; =20 err =3D mwait_idle_probe(); - if (!err && !boot_cpu_has(X86_FEATURE_ARAT)) { + if (!err && !boot_cpu_has(X86_FEATURE_XEN_ARAT)) { hpet_broadcast_init(); if (xen_cpuidle < 0 && !hpet_broadcast_is_available()) err =3D -ENODEV; --- a/xen/arch/x86/include/asm/cpufeatures.h +++ b/xen/arch/x86/include/asm/cpufeatures.h @@ -13,7 +13,7 @@ /* Synthetic features */ XEN_CPUFEATURE(CONSTANT_TSC, X86_SYNTH( 0)) /* TSC ticks at a constan= t rate */ XEN_CPUFEATURE(NONSTOP_TSC, X86_SYNTH( 1)) /* TSC does not stop in C= states */ -XEN_CPUFEATURE(ARAT, X86_SYNTH( 2)) /* Always running APIC ti= mer */ +XEN_CPUFEATURE(XEN_ARAT, X86_SYNTH( 2)) /* Xen may utilize always= running APIC timer */ XEN_CPUFEATURE(ARCH_PERFMON, X86_SYNTH( 3)) /* Intel Architectural Pe= rfMon */ XEN_CPUFEATURE(TSC_RELIABLE, X86_SYNTH( 4)) /* TSC is known to be rel= iable */ XEN_CPUFEATURE(XTOPOLOGY, X86_SYNTH( 5)) /* cpu topology enum exte= nsions */ --- a/xen/arch/x86/time.c +++ b/xen/arch/x86/time.c @@ -2644,7 +2644,7 @@ static int _disable_pit_irq(bool init) * XXX dom0 may rely on RTC interrupt delivery, so only enable * hpet_broadcast if FSB mode available or if force_hpet_broadcast. */ - if ( cpuidle_using_deep_cstate() && !boot_cpu_has(X86_FEATURE_ARAT) ) + if ( cpuidle_using_deep_cstate() && !boot_cpu_has(X86_FEATURE_XEN_ARAT= ) ) { init ? hpet_broadcast_init() : hpet_broadcast_resume(); if ( !hpet_broadcast_is_available() )