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[69.181.90.243]) by smtp.gmail.com with ESMTPSA id gx23sm14851694pjb.39.2020.07.06.07.05.05 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Jul 2020 07:05:05 -0700 (PDT) Received: from gnu-cfl-2.localdomain (localhost [IPv6:::1]) by gnu-cfl-2.localdomain (Postfix) with ESMTP id D0D7C1A00CE for ; Mon, 6 Jul 2020 07:05:04 -0700 (PDT) To: libc-alpha@sourceware.org Subject: [PATCH] x86: Detect Extended Feature Disable (XFD) Date: Mon, 6 Jul 2020 07:05:04 -0700 Message-Id: <20200706140504.2170889-1-hjl.tools@gmail.com> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 X-Spam-Status: No, score=-12.9 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: "H.J. Lu via Libc-alpha" From: "H.J. Lu" Reply-To: "H.J. Lu" Errors-To: libc-alpha-bounces@sourceware.org Sender: "Libc-alpha" An extension called extended feature disable (XFD) is an extension added for Intel AMX to the XSAVE feature set that allows an operating system to enable a feature while preventing specific user threads from using the feature. --- sysdeps/x86/cpu-features.h | 3 +++ sysdeps/x86/tst-get-cpu-features.c | 1 + 2 files changed, 4 insertions(+) diff --git a/sysdeps/x86/cpu-features.h b/sysdeps/x86/cpu-features.h index f25df778cc..bc425462d6 100644 --- a/sysdeps/x86/cpu-features.h +++ b/sysdeps/x86/cpu-features.h @@ -393,6 +393,7 @@ extern const struct cpu_features *__get_cpu_features (void) #define bit_cpu_XSAVEC (1u << 1) #define bit_cpu_XGETBV_ECX_1 (1u << 2) #define bit_cpu_XSAVES (1u << 3) +#define bit_cpu_XFD (1u << 4) /* COMMON_CPUID_INDEX_80000007. */ @@ -578,6 +579,7 @@ extern const struct cpu_features *__get_cpu_features (void) #define index_cpu_XSAVEC COMMON_CPUID_INDEX_D_ECX_1 #define index_cpu_XGETBV_ECX_1 COMMON_CPUID_INDEX_D_ECX_1 #define index_cpu_XSAVES COMMON_CPUID_INDEX_D_ECX_1 +#define index_cpu_XFD COMMON_CPUID_INDEX_D_ECX_1 /* COMMON_CPUID_INDEX_80000007. */ @@ -763,6 +765,7 @@ extern const struct cpu_features *__get_cpu_features (void) #define reg_XSAVEC eax #define reg_XGETBV_ECX_1 eax #define reg_XSAVES eax +#define reg_XFD eax /* COMMON_CPUID_INDEX_80000007. */ diff --git a/sysdeps/x86/tst-get-cpu-features.c b/sysdeps/x86/tst-get-cpu-features.c index dafd66434c..2cff2e86ba 100644 --- a/sysdeps/x86/tst-get-cpu-features.c +++ b/sysdeps/x86/tst-get-cpu-features.c @@ -214,6 +214,7 @@ do_test (void) CHECK_CPU_FEATURE (XSAVEC); CHECK_CPU_FEATURE (XGETBV_ECX_1); CHECK_CPU_FEATURE (XSAVES); + CHECK_CPU_FEATURE (XFD); CHECK_CPU_FEATURE (INVARIANT_TSC); CHECK_CPU_FEATURE (WBNOINVD); CHECK_CPU_FEATURE (AVX512_BF16);