[PATCH 4/5] KVM: x86: Expose Zhaoxin PHE2 CPUID feature

[Ewan Hai]

Advertise the Zhaoxin PadLock Hash Engine v2 to guests via CPUID0xC0000001 EDX bits 25 (PHE2) and 26 (PHE2_EN). PHE2 extends thePadLock hash family with SHA-384 and SHA-512 support per FIPS 180-3,complementing the existing PHE feature (SHA-1 and SHA-256).Two user-mode instructions are exposed, documented in the ZhaoxinPadLock Instruction Reference, chapter 3 ("Hash Engine"):  - REP XSHA384 (encoding F3 0F A6 D8, subsection 3.3)  - REP XSHA512 (encoding F3 0F A6 E0, subsection 3.4)Both consume software-padded 128-byte blocks (RCX = block count, RSI =input, RDI = state) and produce hash output in the state buffer.Both instructions are user-mode and available in all CPU modes, with noassociated MSR control. The PHE2 and PHE2_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 PHE2 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 087c41341240..3fb81f7a6107 100644--- a/arch/x86/kvm/cpuid.c+++ b/arch/x86/kvm/cpuid.c@@ -1288,6 +1288,8 @@ void kvm_initialize_cpu_caps(void) 		F(PMM_EN), 		F(RNG2), 		F(RNG2_EN),+		F(PHE2),+		F(PHE2_EN), 	);  	/*diff --git a/arch/x86/kvm/reverse_cpuid.h b/arch/x86/kvm/reverse_cpuid.hindex 859ba43126d8..f28300c2d5e0 100644--- a/arch/x86/kvm/reverse_cpuid.h+++ b/arch/x86/kvm/reverse_cpuid.h@@ -83,6 +83,8 @@ #define X86_FEATURE_CCS_EN		KVM_X86_FEATURE(CPUID_C000_0001_EDX, 5) #define X86_FEATURE_RNG2		KVM_X86_FEATURE(CPUID_C000_0001_EDX, 22) #define X86_FEATURE_RNG2_EN		KVM_X86_FEATURE(CPUID_C000_0001_EDX, 23)+#define X86_FEATURE_PHE2		KVM_X86_FEATURE(CPUID_C000_0001_EDX, 25)+#define X86_FEATURE_PHE2_EN		KVM_X86_FEATURE(CPUID_C000_0001_EDX, 26)  struct cpuid_reg { 	u32 function;-- 2.34.1




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