From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-dy1-f175.google.com (mail-dy1-f175.google.com [74.125.82.175]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 66BBE3E3DB0 for ; Wed, 13 May 2026 09:36:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.82.175 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778665004; cv=none; b=Dt7S3Xu3ayRORdqDIJQHB7fZocT8uCd2xc+52yIYEvTw6X7jPTq5bk21WqkmsKnduqeyPv4DSz8ZyHBHBlNmxFDqukcGpbffzOmdNDoGsuNe1PwW88z+/sBBCFTK6qz+ZFXvhs8KbHzGwzeGSR8pJOH9QIJTAhlDYOOfTIjSRaY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778665004; c=relaxed/simple; bh=At1gf0Mua3N4YYtHisgY0h9wtx8xtKox/CUCEWQanfk=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=MVg3itvF2IrpHSxAaQTl2yBvTeI5ELGcjZfdyfCzo8OQq6vsQxDfm/cYbCAt0HLQcVrGOxoav5kycZmKBVVk7Y9DJF4X8uISmExJsc+u5EDmxm9aErhpvGT0naDu6UAfA72stqpa6c2VT+TFzCxSLWhHhlan8CSW6EnKcptYMtU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=XcFQx3e5; arc=none smtp.client-ip=74.125.82.175 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="XcFQx3e5" Received: by mail-dy1-f175.google.com with SMTP id 5a478bee46e88-2ef38cf04f0so10083215eec.1 for ; Wed, 13 May 2026 02:36:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1778665002; x=1779269802; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=7R9QlZtKzGZ9Srh0EOuGXWhWVZA7AopSSa5Bhm29kr0=; b=XcFQx3e5q0pLAya9m7yO0JSyxvUs0/irSrCJgQAuefwfmZ7WsWnUXA6AITwvBcWxRY T8GjxIPVlxlbsndMOmSuyu2q9j5MjGDVGek0GL0SOxkOfJ0vuiwhzDrOHL7O6MJqS7Re kXyHqoLgPo+8oVHQzQ/bVubBeKxv6shglDIBzQ9DAul9Ro64r1MDiML1JSHmdmH+iUX7 c3Nrf3nYUt2YPHBuQpDmO5VHkblAJo5nweXRPQF9vo66ZJPUDzyIAFedIuPlGMQwJlNg uCtL65HjwySB+uXJtCkMGw88Jm9Az8dP4fXF6VNOXxIzWwg6a64s7N4eFr1HaL9As/zc lHdA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1778665002; x=1779269802; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=7R9QlZtKzGZ9Srh0EOuGXWhWVZA7AopSSa5Bhm29kr0=; b=lgDXMZmSEIhLInONoE2lExyEd7d0eBE8l51trYrFxBgzcVPYQtEH2RAjYCODwYDobk 71wDtZZHD41DD3XkoaLKRia+gUXIi+0EXNSY/K6wdLTze3H443IJDvQ+IgPO8RVVtnll c7FIDz6GDrfadSshlG4mm259bqBGXs+5bI2wzDXIV8f79cfDTD5QY6SIuft/mgDQ8qu6 1JF1ZyjPajXpjIbtU5o81QEKCBz6LFXDXMaramSdzhfnd1b7tCtrc67/9hYsvhfY5Mev +J8wRhkyvtc67dJUIB69XeKAPDq8WLgr00uz8ywF/8mepzVTzp5eSVAABK93yWtxNAso TYnA== X-Forwarded-Encrypted: i=1; AFNElJ88FtQdiPKOnS+i13cKuWQP8aFaCQYA9bLKdQ1o00v5nMVnhvlMS1vD2PQ1f6MynmSg+6VgjXsLpTAAsNQ=@vger.kernel.org X-Gm-Message-State: AOJu0Yw0RDWuf3nHieUC9SU+rVbUoBrdCVRFjU4K2T2aw8ky4m926VP9 4AP8S0IP8ModXo7X7p/Ev1ZgWpSDeTfvlCfJT25ehZXAT8gWKbefxBNx X-Gm-Gg: Acq92OFqTJbmkfon00aGG/Wf6eOAoqCm8bFzSryHvNZjpQrcVOC/QhZvnlkZOWWHAF1 CKnQwODrMMo4I2ja0KJYr1aV6oD/XXAFQfgqa+QqwPJEtblQffZwbtcWVdJPcsxNUCycdQ3AOcC BLBsWjVOS7IpJHwpOMFmM8Y05wPcg0riT95r6xqLIsu06dT0vzENreWVvgf90qckWtA/9rIJiEB GcXdGJjdDHWvXJj2Zmo44yfMShOjMX7ZlCuOH6lZ/erSnSGVCq9s1sgo16aebrYBQuV2fdIEPh+ YS0QWkBnekKwX/K43WEo1xIVperN2ZwUi5WhSsnLUDQU7virkB41J+lsTbMQQed+YhQfmUP23pH 6lWLwbQnPBGqVzQ896bg01M9sZYu45iTk5cj9Zw1YRrmc4Q/d2N8/34lweMH2ZsvuGTBLYriJ21 vXnhVvTqQctazL1Fhlwf4Hdowb+Qjq/u4SdMvwdIV8 X-Received: by 2002:a05:693c:2c88:b0:2f5:5dd3:1fd8 with SMTP id 5a478bee46e88-301184afea7mr1772103eec.8.1778665002245; Wed, 13 May 2026 02:36:42 -0700 (PDT) Received: from ewan-server.zhaoxin.com ([154.26.185.247]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-2f8859eb4b7sm22100439eec.2.2026.05.13.02.36.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 13 May 2026 02:36:41 -0700 (PDT) From: Ewan Hai To: seanjc@google.com, pbonzini@redhat.com, tglx@kernel.org, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: cobechen@zhaoxin.com, tonywwang@zhaoxin.com Subject: [PATCH 1/5] KVM: x86: Expose Zhaoxin SM2 CPUID feature Date: Wed, 13 May 2026 17:36:29 +0800 Message-Id: <20260513093633.1608334-2-ewandevelop@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260513093633.1608334-1-ewandevelop@gmail.com> References: <20260513093633.1608334-1-ewandevelop@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Advertise the Zhaoxin SM2 instruction support to guests via CPUID 0xC0000001 EDX bits 0 (SM2) and 1 (SM2_EN). The SM2 instruction (encoding F2 0F A6 C0) implements the SM2 elliptic-curve public-key cryptography algorithm specified in GM/T 0003-2012; the hardware-level behavior is documented in the Zhaoxin GMI Instruction Set Reference, chapter 1 ("SM2"). The instruction multiplexes its sub-functions on the RDX[5:0] control word: encryption (subsection 1.1), decryption (1.2), signing (1.3), signature verification (1.4), the three key-exchange sub-operations of section 1.5 (1.5.1 SM2 key-pair generation, which the spec also uses for the initiator's ephemeral key; 1.5.2 responder shared-key derivation; 1.5.3 initiator shared-key derivation), and two preprocess steps for identity and message hashing (1.6.1 and 1.6.2). The instruction is user-mode and available in all CPU modes, with no associated MSR control. The SM2 and SM2_EN bits are redundant by hardware design (set or cleared together) and both serve purely as CPUID-level feature-presence reporting flags requiring no KVM emulation. Both bits are advertised because different software may probe either one when checking for SM2 availability. Signed-off-by: Ewan Hai --- arch/x86/kvm/cpuid.c | 2 ++ arch/x86/kvm/reverse_cpuid.h | 4 ++++ 2 files changed, 6 insertions(+) diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index e69156b54cff..1eb4b88aaa80 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -1272,6 +1272,8 @@ void kvm_initialize_cpu_caps(void) kvm_cpu_cap_set(X86_FEATURE_NULL_SEL_CLR_BASE); kvm_cpu_cap_init(CPUID_C000_0001_EDX, + F(SM2), + F(SM2_EN), F(XSTORE), F(XSTORE_EN), F(XCRYPT), diff --git a/arch/x86/kvm/reverse_cpuid.h b/arch/x86/kvm/reverse_cpuid.h index 657f5f743ed9..7b55110cc046 100644 --- a/arch/x86/kvm/reverse_cpuid.h +++ b/arch/x86/kvm/reverse_cpuid.h @@ -76,6 +76,10 @@ #define KVM_X86_FEATURE_TSA_SQ_NO KVM_X86_FEATURE(CPUID_8000_0021_ECX, 1) #define KVM_X86_FEATURE_TSA_L1_NO KVM_X86_FEATURE(CPUID_8000_0021_ECX, 2) +/* Zhaoxin/Centaur sub-features, CPUID level 0xC0000001 (EDX) */ +#define X86_FEATURE_SM2 KVM_X86_FEATURE(CPUID_C000_0001_EDX, 0) +#define X86_FEATURE_SM2_EN KVM_X86_FEATURE(CPUID_C000_0001_EDX, 1) + struct cpuid_reg { u32 function; u32 index; -- 2.34.1