From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Wed, 4 Sep 2013 18:05:13 +0000 (-0700)
Subject: Merge branch 'x86-paravirt-for-linus' of git://git.kernel.org/pub/scm/linux/kernel... 
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=05eebfb26bac9215410b70e0f043861aecff896c;p=linux-beck.git

Merge branch 'x86-paravirt-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 paravirt changes from Ingo Molnar:
 "Hypervisor signature detection cleanup and fixes - the goal is to make
  KVM guests run better on MS/Hyperv and to generalize and factor out
  the code a bit"

* 'x86-paravirt-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86: Correctly detect hypervisor
  x86, kvm: Switch to use hypervisor_cpuid_base()
  xen: Switch to use hypervisor_cpuid_base()
  x86: Introduce hypervisor_cpuid_base()
---

05eebfb26bac9215410b70e0f043861aecff896c
diff --cc arch/x86/include/asm/processor.h
index 4c2d31d941ea,7763307b4137..987c75ecc334
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@@ -942,6 -942,50 +942,21 @@@ extern int set_tsc_mode(unsigned int va
  
  extern u16 amd_get_nb_id(int cpu);
  
 -struct aperfmperf {
 -	u64 aperf, mperf;
 -};
 -
 -static inline void get_aperfmperf(struct aperfmperf *am)
 -{
 -	WARN_ON_ONCE(!boot_cpu_has(X86_FEATURE_APERFMPERF));
 -
 -	rdmsrl(MSR_IA32_APERF, am->aperf);
 -	rdmsrl(MSR_IA32_MPERF, am->mperf);
 -}
 -
 -#define APERFMPERF_SHIFT 10
 -
 -static inline
 -unsigned long calc_aperfmperf_ratio(struct aperfmperf *old,
 -				    struct aperfmperf *new)
 -{
 -	u64 aperf = new->aperf - old->aperf;
 -	u64 mperf = new->mperf - old->mperf;
 -	unsigned long ratio = aperf;
 -
 -	mperf >>= APERFMPERF_SHIFT;
 -	if (mperf)
 -		ratio = div64_u64(aperf, mperf);
 -
 -	return ratio;
 -}
 -
+ static inline uint32_t hypervisor_cpuid_base(const char *sig, uint32_t leaves)
+ {
+ 	uint32_t base, eax, signature[3];
+ 
+ 	for (base = 0x40000000; base < 0x40010000; base += 0x100) {
+ 		cpuid(base, &eax, &signature[0], &signature[1], &signature[2]);
+ 
+ 		if (!memcmp(sig, signature, 12) &&
+ 		    (leaves == 0 || ((eax - base) >= leaves)))
+ 			return base;
+ 	}
+ 
+ 	return 0;
+ }
+ 
  extern unsigned long arch_align_stack(unsigned long sp);
  extern void free_init_pages(char *what, unsigned long begin, unsigned long end);