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

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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()
This commit is contained in:
Linus Torvalds
2013-09-04 11:05:13 -07:00
parent cb3e4330e6 9df56f19a5
commit 05eebfb26b
9 changed files with 53 additions and 61 deletions
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15
arch/x86/include/asm/processor.h
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@@ -942,6 +942,21 @@ extern int set_tsc_mode(unsigned int val);
extern u16 amd_get_nb_id(int cpu);
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);