kvmtool/x86/include/kvm/cpufeature.h

#ifndef KVM__CPUFEATURE_H
#define KVM__CPUFEATURE_H

#define CPUID_VENDOR_INTEL_1 0x756e6547 /* "Genu" */
#define CPUID_VENDOR_INTEL_2 0x49656e69 /* "ineI" */
#define CPUID_VENDOR_INTEL_3 0x6c65746e /* "ntel" */

#define CPUID_VENDOR_AMD_1   0x68747541 /* "Auth" */
#define CPUID_VENDOR_AMD_2   0x69746e65 /* "enti" */
#define CPUID_VENDOR_AMD_3   0x444d4163 /* "cAMD" */

/*
 * CPUID flags we need to deal with
 */
#define KVM__X86_FEATURE_VMX		5	/* Hardware virtualization */
#define KVM__X86_FEATURE_SVM		2	/* Secure virtual machine */
#define KVM__X86_FEATURE_XSAVE		26	/* XSAVE/XRSTOR/XSETBV/XGETBV */

#define cpu_feature_disable(reg, feature)	\
	((reg) & ~(1 << (feature)))
#define cpu_feature_enable(reg, feature)	\
	((reg) |  (1 << (feature)))

struct cpuid_regs {
	u32	eax;
	u32	ebx;
	u32	ecx;
	u32	edx;
};

static inline void host_cpuid(struct cpuid_regs *regs)
{
	asm volatile("cpuid"
		: "=a" (regs->eax),
		  "=b" (regs->ebx),
		  "=c" (regs->ecx),
		  "=d" (regs->edx)
		: "0" (regs->eax), "2" (regs->ecx));
}

#endif /* KVM__CPUFEATURE_H */