[PATCH 2/5] KVM: x86: Expose Zhaoxin CCS (SM3 + SM4) CPUID feature

[Ewan Hai]

Advertise the Zhaoxin CCS (Chinese Cryptography Standard) feature toguests via CPUID 0xC0000001 EDX bits 4 (CCS) and 5 (CCS_EN). CCS groupstwo user-mode instructions for Chinese national cryptographicprimitives, documented in the Zhaoxin GMI Instruction Set Reference,chapter 2 ("CCS instruction group"):  - SM3 (encoding F3 0F A6 E8, subsection 2.1) implements the SM3 hash    algorithm specified in GM/T 0004-2012. It supports two modes    selected by RAX: auto-padding stream mode (RAX=0) and pre-padded    block mode (RAX=-1).  - SM4 (encoding F3 0F A7 F0, subsection 2.2) implements the SM4 block    cipher specified in GM/T 0002-2012, supporting ECB / CBC / CFB /    OFB / CTR modes via a control word in RAX, and CBC-MAC / CFB-MAC    when RAX bit[11] is set.Both instructions are user-mode and available in all CPU modes, with noassociated MSR control. The CCS and CCS_EN bits are redundant byhardware design (set or cleared together) and both serve purely asCPUID-level feature-presence reporting flags requiring no KVMemulation. Both bits are advertised because different software mayprobe either one when checking for CCS availability.Signed-off-by: Ewan Hai <ewanhai-oc@xxxxxxxxxxx>--- arch/x86/kvm/cpuid.c         | 2 ++ arch/x86/kvm/reverse_cpuid.h | 2 ++ 2 files changed, 4 insertions(+)diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.cindex 1eb4b88aaa80..8aaa3f20670e 100644--- a/arch/x86/kvm/cpuid.c+++ b/arch/x86/kvm/cpuid.c@@ -1276,6 +1276,8 @@ void kvm_initialize_cpu_caps(void) 		F(SM2_EN), 		F(XSTORE), 		F(XSTORE_EN),+		F(CCS),+		F(CCS_EN), 		F(XCRYPT), 		F(XCRYPT_EN), 		F(ACE2),diff --git a/arch/x86/kvm/reverse_cpuid.h b/arch/x86/kvm/reverse_cpuid.hindex 7b55110cc046..a1cd9116ef63 100644--- a/arch/x86/kvm/reverse_cpuid.h+++ b/arch/x86/kvm/reverse_cpuid.h@@ -79,6 +79,8 @@ /* 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)+#define X86_FEATURE_CCS			KVM_X86_FEATURE(CPUID_C000_0001_EDX, 4)+#define X86_FEATURE_CCS_EN		KVM_X86_FEATURE(CPUID_C000_0001_EDX, 5)  struct cpuid_reg { 	u32 function;-- 2.34.1




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