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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 1vMWI9-000000003i4-1QJt; Fri, 21 Nov 2025 13:55:34 -0500 From: Rik van Riel To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, x86@kernel.org, dave.hansen@linux.intel.com, peterz@infradead.org, kernel-team@meta.com, bp@alien8.de, Yu-cheng Yu , Rik van Riel Subject: [RFC v5 3/8] x86/mm: Introduce X86_FEATURE_RAR Date: Fri, 21 Nov 2025 13:54:24 -0500 Message-ID: <20251121185530.21876-4-riel@surriel.com> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20251121185530.21876-1-riel@surriel.com> References: <20251121185530.21876-1-riel@surriel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 6842C1C0002 X-Stat-Signature: gfectp3dm58homhyne6yh8isjtjsymat X-Rspam-User: X-HE-Tag: 1763751345-247647 X-HE-Meta: U2FsdGVkX18/SmqmlctHc/BmySt+NXjv2JSqiWOGJkEmdhbUoRYgJTWrDVHbqz7zj2+VTSaKVSb3Q8pT/N7xwqTzjuTakK1pCCol0EbLkMHXYqhxbqAzXFCVnI9Gm+aOPKv75++EAGE+YCpPxPPJiveFlcGqk4xVjHMrMNSCCYVaJOQb/nUl6kBc0xwbNrKfV6nRI5jU0ENthepdo0yuDV/xiDAWbgsUzPUNAZrbOZYdL39rncGxJ6a/3DlxdAHMLEifmhfKlWVDliUsZ0vnQS4x1TCpWQ6j2i7r1fq+k6cd878pNU1IUtcXg6Jq8xTqWMOcwZqgpOfypGxq1GSekzRBxg6kC3hAwFo0Z7cr4Vk4h1Z8xGCmMyM2b0+11c5Zak5Goq6STqimWD0UX7MKBwlN9fOQUDF7gTZzHa4j4O/d9bT8tD9WoRZir+jyW9ABdg1ss3qvYKvcSGYTZH7oBZTmx9ouDqZPAtNLc2h1bExR9LamtjgiroCTnJTYq7fKhDtAYEeSCelzK9pLTJjYIRt9xAIdvuNI5BWvbQXrDM06eVpw+dfqtP9Ds0iAmW1uhcweM0wk9AahqNvIiHtM1Oyc6APPNVTHOk1z41MYxNxmb5vP9YqG7cR7FapahPg5T0ho4moW4MiSaSMVDMawX7qCDvQ6qPRjv470LWdR3XHpfmN90fogGvSeHL5w87UQqq7FvdrMmlWoM7fogTzwTkTF9sm+lY2lCcFfeDBZqnD3UAYJK0fJTF/DINocX1uCQr82a9KMuXuYL3z2B82OqeuiTGQErVlhfCNdj/ESpSTTpCGG0GMnd0PUxYElTZFqF1aQXnoapCVo3ZGmwkDU8o6SC+0O/LySIfl1wwpAiQrZDPO5Hz/mEAUa+jqRO4GgZEAEasEPBuBHwowXEje0cSFRWNTybocPEO3/v7TmN1YpLV0tZAn5RiUNLFIhlkt5BBkSm+g0GTXkWHuOZ2O 7R8ixySJ milR3gZQi1RHinIr6r97nqI81rzSvEPIgNbaW4oPXAWa2R0EURbo3bpCR+wJB/6cy3x/CNdcxIWSfoYJwRX53rDDpi/J7UFFkSYLwTgcMZcZCpeNSJEXa2lZdB2t0fayFwWvfF9ZHEVMGnqT0JaBAoLFYhll2JxTZCFx0YRQvuFnoTuaVtxzGWwhBiHcAqn+QYCGfKz/obiOaw84lmLzV/67mF8uJ1U41mwZMdRSY2QDtDc5v6LfCXqGIavHiBERPOC9Lm8TKDlILWtdS5PCl/9w0yG8vJMNaHr++LPhOvVp5SLlocO4HH/oq45E7WHV7JrYqWBnGHj0TUBgf885XS3wPUw== 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: Yu-cheng Yu 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/intel.c | 9 +++++++++ 3 files changed, 14 insertions(+), 1 deletion(-) diff --git a/arch/x86/Kconfig.cpufeatures b/arch/x86/Kconfig.cpufeatures index 733d5aff2456..6389f0a617c8 100644 --- a/arch/x86/Kconfig.cpufeatures +++ b/arch/x86/Kconfig.cpufeatures @@ -199,3 +199,7 @@ 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 b6472e252491..5cb57a820198 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/intel.c b/arch/x86/kernel/cpu/intel.c index 98ae4c37c93e..b53bf3452d6a 100644 --- a/arch/x86/kernel/cpu/intel.c +++ b/arch/x86/kernel/cpu/intel.c @@ -719,6 +719,15 @@ static void intel_detect_tlb(struct cpuinfo_x86 *c) cpuid_leaf_0x2(®s); for_each_cpuid_0x2_desc(regs, ptr, desc) intel_tlb_lookup(desc); + + if (cpu_has(c, X86_FEATURE_CORE_CAPABILITIES)) { + u64 msr; + + rdmsrl(MSR_IA32_CORE_CAPS, msr); + + if (msr & MSR_IA32_CORE_CAPS_RAR) + setup_force_cpu_cap(X86_FEATURE_RAR); + } } static const struct cpu_dev intel_cpu_dev = { -- 2.51.1