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Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by SN1PEPF000397B5.mail.protection.outlook.com (10.167.248.59) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.8026.11 via Frontend Transport; Tue, 1 Oct 2024 06:34:31 +0000 Received: from chalupa-d178host.amd.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Tue, 1 Oct 2024 01:34:30 -0500 From: Manali Shukla To: , CC: , , , , , , , , Subject: [RFC PATCH v2 1/5] x86/cpu: Add virt tag in /proc/cpuinfo Date: Tue, 1 Oct 2024 06:34:09 +0000 Message-ID: <20241001063413.687787-2-manali.shukla@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241001063413.687787-1-manali.shukla@amd.com> References: <20241001063413.687787-1-manali.shukla@amd.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN1PEPF000397B5:EE_|IA1PR12MB8465:EE_ X-MS-Office365-Filtering-Correlation-Id: 3461547f-6a6b-4e6b-3ca8-08dce1e31bd3 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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CTRY:US; LANG:en; SCL:1; SRV:; IPV:CAL; SFV:NSPM; H:SATLEXMB04.amd.com; PTR:InfoDomainNonexistent; CAT:NONE; SFS:(13230040)(376014)(36860700013)(1800799024)(82310400026); DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Oct 2024 06:34:31.9484 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 3461547f-6a6b-4e6b-3ca8-08dce1e31bd3 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d; Ip=[165.204.84.17]; Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SN1PEPF000397B5.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB8465 Add support for generating Virtualization feature names in capflags.c and use the resulting x86_virt_flags to print the virt flags in /proc/cpuinfo. Currently, it is difficult to check if a feature is supported in _KVM_. Manually querying cpuid to know whether the feature is supported or not can be quite tedious at times. Print the features supported in KVM hypervisor in a dedicated "virt" line instead of adding them to the common "flags". To do so, define flags which are needed to be added in a dedicated virt line in /proc/cpuinfo with prefix X86_VIRT_FEATURE_. Signed-off-by: Manali Shukla --- arch/x86/include/asm/cpufeature.h | 1 + arch/x86/kernel/cpu/mkcapflags.sh | 3 +++ arch/x86/kernel/cpu/proc.c | 5 +++++ 3 files changed, 9 insertions(+) diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h index 0b9611da6c53..74c52bfd8cf2 100644 --- a/arch/x86/include/asm/cpufeature.h +++ b/arch/x86/include/asm/cpufeature.h @@ -41,6 +41,7 @@ enum cpuid_leafs #define x86_cap_flag_num(flag) ((flag) >> 5), ((flag) & 31) extern const char * const x86_cap_flags[NCAPINTS*32]; +extern const char * const x86_virt_flags[NCAPINTS*32]; extern const char * const x86_power_flags[32]; #define X86_CAP_FMT "%s" #define x86_cap_flag(flag) x86_cap_flags[flag] diff --git a/arch/x86/kernel/cpu/mkcapflags.sh b/arch/x86/kernel/cpu/mkcapflags.sh index 68f537347466..3671c7892c56 100644 --- a/arch/x86/kernel/cpu/mkcapflags.sh +++ b/arch/x86/kernel/cpu/mkcapflags.sh @@ -62,6 +62,9 @@ trap 'rm "$OUT"' EXIT dump_array "x86_bug_flags" "NBUGINTS*32" "X86_BUG_" "NCAPINTS*32" $2 echo "" + dump_array "x86_virt_flags" "NCAPINTS*32" "X86_VIRT_FEATURE_" "" $2 + echo "" + echo "#ifdef CONFIG_X86_VMX_FEATURE_NAMES" echo "#ifndef _ASM_X86_VMXFEATURES_H" echo "#include " diff --git a/arch/x86/kernel/cpu/proc.c b/arch/x86/kernel/cpu/proc.c index e65fae63660e..3068b0a110e4 100644 --- a/arch/x86/kernel/cpu/proc.c +++ b/arch/x86/kernel/cpu/proc.c @@ -103,6 +103,11 @@ static int show_cpuinfo(struct seq_file *m, void *v) if (cpu_has(c, i) && x86_cap_flags[i] != NULL) seq_printf(m, " %s", x86_cap_flags[i]); + seq_puts(m, "\nvirt\t\t:"); + for (i = 0; i < 32*NCAPINTS; i++) + if (cpu_has(c, i) && x86_virt_flags[i] != NULL) + seq_printf(m, " %s", x86_virt_flags[i]); + #ifdef CONFIG_X86_VMX_FEATURE_NAMES if (cpu_has(c, X86_FEATURE_VMX) && c->vmx_capability[0]) { seq_puts(m, "\nvmx flags\t:");