From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-dl1-f49.google.com (mail-dl1-f49.google.com [74.125.82.49]) (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 F19BE423A99 for ; Wed, 13 May 2026 12:48:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.82.49 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778676537; cv=none; b=N2/Ip7BYvhvo/I9pJyscw5+jQVaz1Nk/PnvagVI0QvwSySdKrjH3sWRu/B1JUlcLI4rnUDUDbxCclaRR6RwjDVP7A71yJUYlELwj9spfQfxjWqTzm4TX6qot3cz2x4sWxofRqacbCXzfc7l7hajdJPiPTPSsS4Vd5enL0MCtokE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778676537; c=relaxed/simple; bh=At1gf0Mua3N4YYtHisgY0h9wtx8xtKox/CUCEWQanfk=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=h4r8BbTwLuDW2imchqfxdeMshsuXuOfJq+PNCfOp6787+P6nYmLQdCx8xrBBZG7gYOvA73dsRCCStIOOxNFTqxNg34P9CrpvFT5ITpeCklQGh0K/mGJQc8Jv42tPJxKfMEhbJRYn95c85TYVDezAUMVqMYdqe6SwtIGSWG912l4= 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=P4dhLRlB; arc=none smtp.client-ip=74.125.82.49 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="P4dhLRlB" Received: by mail-dl1-f49.google.com with SMTP id a92af1059eb24-130c9dcbd25so6168443c88.1 for ; Wed, 13 May 2026 05:48:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1778676535; x=1779281335; 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=P4dhLRlBXY0yvNw/Xywjzd8ZgI03EidLtCMa1oJUtpk8pP2mfDPAixmAZqskOtIbCO p0hL8quhOLvZHtV9/6KGdPPNyGh/KERiRKdWDyFGxvclXnaMF5miK5dqwQJjWaEoF316 hO7NEreHvKs6qfDbWx2Bpw9V8Y9+2nzWApK7v/hMiZDpfWRxLCa1/qlXo9qy9dneJFcF WJKkGcCfo56PhtkaMKLYKHV1fBRxQkbcuobOCuypFprOTbyYI0i5QIuko5AiQeqgUF1k X7q9aoRqREmJooFEtMTLz6bXok6HCFHKZq2GLnqIO+ZBLHu4lTz4y7flCKDU/4SwKDVx rPNA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1778676535; x=1779281335; 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=rSR9feAF0Ij5z7R4pG6iEvIL9DBiKBX3nV4CovVLWoGyhDnmHVtaHk8a3x/WJEaLSH hGoR8y1Y+fxuoLaoSxWpouoMMriEWdLDTjGrZgwIgEm0t5219Ubjr+tlGhpyZx8x48Q+ nFQK9NjmBSNxSZGz0NqmzfDNK43+7seVaez1m8s83AB+798aWhJbGBdAF+LaSbpWlW4l X/rbEwpG3Sq61XRfFGJ39YJVXiXJquS+BD9/aTEKiljVXLuTXceWj1d94BxADi6dnLJB Bowqv6VnF+3zM/kvUI87fti3ZTMy1djhGlkiOoC3FjTbGgm1XJqMrg4NIdSq1Ayq+B+w 6tMg== X-Forwarded-Encrypted: i=1; AFNElJ9N9zDQovh3/3c9/OgzdNb9v66CmHVSNLkLLhOXlWFJ0FlF8YSwmK0cD7vIabhTb8JdzAzs7Xw2Xdx4oBo=@vger.kernel.org X-Gm-Message-State: AOJu0YxSnh8akgnLjMjDCoaNUIeqokzKnPF08CofRq5vGn1AdgqiLbPp 3ZRBiiJL0glCO6KEXPgVhTl/IDkX08RNaCysL8M5PPsh+MTuFuhr38+mePQ7zS46Vjc= X-Gm-Gg: Acq92OFlzbY7p71Rdoe3y2/34Z0lPT90UGfNNpToOocvkZ2pGcKVO6IheZP145UNV0Q kC4KVs5I6DmMlDmz1mkMZoyZJBPApV30YeZFGHwGPMjkPwLgYjz3mvg9r8uVlvBHhQJZ/wXOxwj Dsm+6PE5jJ1HVAMFE3UcOFi6Yi4eaXLbyhpxh/rUJpjg76hMIKaO35Kb4xjYgZY/sBFGq1Ql2M7 PWCnyLcqq33EUnKyFPSL2WAJeQA7wk3bECvwGwtrftgKdbwQspH6TerxLSnheBuUBuUZ4qjXXez ZdtGzajci1JSwY9Ign+hWi21ntrqGc8jIRDemEsEjwdQyCObGrYK9OKbi5q/waBtYwm/AzYNSmc tnEKMPT65ElzB3VNE8/W2mTd9FqQ9A11AM8qusn4/JsfFkwYmgefSPREMlAeK3nYWNZJJQkcEh+ DsqmA6BidyL1n17AwPQo2Lv6GZ+AzIT0S6TnKlQ24K X-Received: by 2002:a05:7022:6894:b0:12e:57fd:ca2 with SMTP id a92af1059eb24-1341e7be18bmr1775851c88.3.1778676534984; Wed, 13 May 2026 05:48:54 -0700 (PDT) Received: from ewan-server.zhaoxin.com ([154.26.185.247]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-134b4e153dbsm1066142c88.12.2026.05.13.05.48.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 13 May 2026 05:48:54 -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 v1 1/5] KVM: x86: Expose Zhaoxin SM2 CPUID feature Date: Wed, 13 May 2026 20:48:42 +0800 Message-Id: <20260513124846.1622462-2-ewandevelop@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260513124846.1622462-1-ewandevelop@gmail.com> References: <20260513124846.1622462-1-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