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Revert "i386: derive '-cpu host' from KVM_GET_SUPPORTED_CPUID" 

This reverts commit 66e3dd9282.

From Avi,

 "Anthony, I think we should revert that commit and refactor cpuid for
  1.1.  The logic is spread over too many places which makes it hard to
  reason about."

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Anthony Liguori 2011-11-27 11:13:01 -06:00
parent bc75c9e50d
commit a1fd24af4d
1 changed files with 23 additions and 4 deletions
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27
target-i386/cpuid.c
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@ -107,14 +107,33 @@ void host_cpuid(uint32_t function, uint32_t count,
uint32_t *eax, uint32_t *ebx, uint32_t *ecx, uint32_t *edx)
{
#if defined(CONFIG_KVM)
uint32_t vec[4];
#ifdef __x86_64__
asm volatile("cpuid"
: "=a"(vec[0]), "=b"(vec[1]),
"=c"(vec[2]), "=d"(vec[3])
: "0"(function), "c"(count) : "cc");
#else
asm volatile("pusha \n\t"
"cpuid \n\t"
"mov %%eax, 0(%2) \n\t"
"mov %%ebx, 4(%2) \n\t"
"mov %%ecx, 8(%2) \n\t"
"mov %%edx, 12(%2) \n\t"
"popa"
: : "a"(function), "c"(count), "S"(vec)
: "memory", "cc");
#endif
if (eax)
*eax = kvm_arch_get_supported_cpuid(kvm_state, function, count, R_EAX);
*eax = vec[0];
if (ebx)
*ebx = kvm_arch_get_supported_cpuid(kvm_state, function, count, R_EBX);
*ebx = vec[1];
if (ecx)
*ecx = kvm_arch_get_supported_cpuid(kvm_state, function, count, R_ECX);
*ecx = vec[2];
if (edx)
*edx = kvm_arch_get_supported_cpuid(kvm_state, function, count, R_EDX);
*edx = vec[3];
#endif
}