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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9D92EC54754 for ; Tue, 20 May 2025 01:04:36 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 18E066B00A1; Mon, 19 May 2025 21:04:22 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id EC4316B00A3; Mon, 19 May 2025 21:04:21 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id CA70E6B00A7; Mon, 19 May 2025 21:04:21 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id 7FF196B00A6 for ; Mon, 19 May 2025 21:04:21 -0400 (EDT) Received: from smtpin29.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay01.hostedemail.com (Postfix) with ESMTP id 282811D41B7 for ; Tue, 20 May 2025 01:04:21 +0000 (UTC) X-FDA: 83461490322.29.C42B585 Received: from shelob.surriel.com (shelob.surriel.com [96.67.55.147]) by imf11.hostedemail.com (Postfix) with ESMTP id A2E004000A for ; Tue, 20 May 2025 01:04:19 +0000 (UTC) Authentication-Results: imf11.hostedemail.com; dkim=none; spf=pass (imf11.hostedemail.com: domain of riel@shelob.surriel.com designates 96.67.55.147 as permitted sender) smtp.mailfrom=riel@shelob.surriel.com; dmarc=none ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1747703059; h=from:from:sender:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=azv+glwVj0qCbMtL1wCDMsbsmvVZAE1b/VBTVGvGDHc=; b=JoqoydwUTEyifxJFzcwhR7zLyrT8V4MymuAwKoF5chzf7Lt+bV25xoEX3qRhOE01BrtsWZ 3s7RFx+KasJ2KlX33sA3xJvHFgCLqI7mPkQIL8vRtkN7QjeS8ydPm6g4TDjAb9xHKsz2RW XgQJ2DE1lfKYn04CvfmIIFxXL832Cnk= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1747703059; a=rsa-sha256; cv=none; b=uKf5CcFQist+G9xt0bcy1leBSAMfecU3so/KAhIdAzaLhAHDqTpPpE6tFkjev+zT4axXeY Wjxx3K0/crQMJX1lfYHecl1OukW50gOZ7ZYbNvpdDnR9GmYTFkNke2BDiLdsZgH871E3AL uV/U2vJTsvljb6hwmez7wSc17akWVGQ= ARC-Authentication-Results: i=1; imf11.hostedemail.com; dkim=none; spf=pass (imf11.hostedemail.com: domain of riel@shelob.surriel.com designates 96.67.55.147 as permitted sender) smtp.mailfrom=riel@shelob.surriel.com; dmarc=none Received: from fangorn.home.surriel.com ([10.0.13.7]) by shelob.surriel.com with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.97.1) (envelope-from ) id 1uHBOd-000000000aB-02i9; Mon, 19 May 2025 21:03:55 -0400 From: Rik van Riel To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, x86@kernel.org, kernel-team@meta.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, nadav.amit@gmail.com, Rik van Riel , Yu-cheng Yu , Rik van Riel Subject: [RFC v2 4/9] x86/mm: Introduce X86_FEATURE_RAR Date: Mon, 19 May 2025 21:02:29 -0400 Message-ID: <20250520010350.1740223-5-riel@surriel.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250520010350.1740223-1-riel@surriel.com> References: <20250520010350.1740223-1-riel@surriel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: wjfdsrxgc4qgh5h8ckanp45t4ferrgtx X-Rspamd-Queue-Id: A2E004000A X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1747703059-946374 X-HE-Meta: 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 IVUOT5Qs AzrZiYg21z0guuis3JBEcMpn3of43WLvTZZjYeJVH2Gnp4mTP9ZioxjVoq+7L13uy5/gercoVnwAFWacRlMmob/D/UTyE0AsZxo3vgWT7en2UwcJctNU8twjsdhQYsKsWlppJnCO3NE4m1hxv0tzP8BnjmKRrEJfSd7AziJCi07NC/9AJmwm0rn8ugT+zJKQP9+AMDK97daAHiM/YfH4AglpQcQVe48yql7ahkxGaG76teNrVO/ole1E1V0sGaOUuTICp0Duie18fptLrxuXxB2LV2V5jhEXPTGOmXph8RDET7kFcImMDbLrB/W1xFwxw5R1ItLf/MWMLTPJHeZltHhrPdw4l1rqKIF4r/BYyygedlp3WEgzrgkWplXcNeZCtM1WQrgN/fMKcEKjB1oTKerUSX7UKaTBZF/oCr5Y05CM+1D4qrhPR1X8LgSZyEoLOOMZrQ2kXYf8K+E0fF6wtgr15v9+NmXQefgQv X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Rik van Riel Introduce X86_FEATURE_RAR and enumeration of the feature. [riel: moved initialization to intel.c and disabling to Kconfig.cpufeatures] Signed-off-by: Yu-cheng Yu Signed-off-by: Rik van Riel --- arch/x86/Kconfig.cpufeatures | 4 ++++ arch/x86/include/asm/cpufeatures.h | 2 +- arch/x86/kernel/cpu/common.c | 13 +++++++++++++ 3 files changed, 18 insertions(+), 1 deletion(-) diff --git a/arch/x86/Kconfig.cpufeatures b/arch/x86/Kconfig.cpufeatures index 250c10627ab3..7d459b5f47f7 100644 --- a/arch/x86/Kconfig.cpufeatures +++ b/arch/x86/Kconfig.cpufeatures @@ -195,3 +195,7 @@ config X86_DISABLED_FEATURE_SEV_SNP config X86_DISABLED_FEATURE_INVLPGB def_bool y depends on !BROADCAST_TLB_FLUSH + +config X86_DISABLED_FEATURE_RAR + def_bool y + depends on !BROADCAST_TLB_FLUSH diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h index 5b50e0e35129..0729c2d54109 100644 --- a/arch/x86/include/asm/cpufeatures.h +++ b/arch/x86/include/asm/cpufeatures.h @@ -76,7 +76,7 @@ #define X86_FEATURE_K8 ( 3*32+ 4) /* Opteron, Athlon64 */ #define X86_FEATURE_ZEN5 ( 3*32+ 5) /* CPU based on Zen5 microarchitecture */ #define X86_FEATURE_ZEN6 ( 3*32+ 6) /* CPU based on Zen6 microarchitecture */ -/* Free ( 3*32+ 7) */ +#define X86_FEATURE_RAR ( 3*32+ 7) /* Intel Remote Action Request */ #define X86_FEATURE_CONSTANT_TSC ( 3*32+ 8) /* "constant_tsc" TSC ticks at a constant rate */ #define X86_FEATURE_UP ( 3*32+ 9) /* "up" SMP kernel running on UP */ #define X86_FEATURE_ART ( 3*32+10) /* "art" Always running timer (ART) */ diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index 8feb8fd2957a..dd662c42f510 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -1545,6 +1545,18 @@ static void __init cpu_set_bug_bits(struct cpuinfo_x86 *c) setup_force_cpu_bug(X86_BUG_L1TF); } +static void __init detect_rar(struct cpuinfo_x86 *c) +{ + u64 msr; + + if (cpu_has(c, X86_FEATURE_CORE_CAPABILITIES)) { + rdmsrl(MSR_IA32_CORE_CAPABILITIES, msr); + + if (msr & CORE_CAP_RAR) + setup_force_cpu_cap(X86_FEATURE_RAR); + } +} + /* * The NOPL instruction is supposed to exist on all CPUs of family >= 6; * unfortunately, that's not true in practice because of early VIA @@ -1771,6 +1783,7 @@ static void __init early_identify_cpu(struct cpuinfo_x86 *c) setup_clear_cpu_cap(X86_FEATURE_LA57); detect_nopl(); + detect_rar(c); } void __init init_cpu_devs(void) -- 2.49.0