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introduce -cpu host target 

Although the guest's CPUID bits can be controlled in a fine grained way
in QEMU, a simple way to inject the host CPU is missing. This is handy
for KVM desktop virtualization, where one wants the guest to support the
full host feature set.
Introduce another CPU type called 'host', which will propagate the host's
CPUID bits to the guest. Unwanted bits can still be turned off by using
the existing syntax (-cpu host,-skinit)

Signed-off-by: Andre Przywara <andre.przywara@amd.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Andre Przywara 2009-06-25 00:08:00 +02:00 committed by Anthony Liguori
parent 6d2edc4373
commit fe4bce09b6
1 changed files with 59 additions and 6 deletions
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65
target-i386/helper.c
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@ -273,9 +273,9 @@ static x86_def_t x86_defs[] = {
{
.name = "athlon",
.level = 2,
.vendor1 = 0x68747541, /* "Auth" */
.vendor2 = 0x69746e65, /* "enti" */
.vendor3 = 0x444d4163, /* "cAMD" */
.vendor1 = CPUID_VENDOR_AMD_1,
.vendor2 = CPUID_VENDOR_AMD_2,
.vendor3 = CPUID_VENDOR_AMD_3,
.family = 6,
.model = 2,
.stepping = 3,
@ -308,6 +308,54 @@ static x86_def_t x86_defs[] = {
},
};
static void host_cpuid(uint32_t function, uint32_t count, uint32_t *eax,
uint32_t *ebx, uint32_t *ecx, uint32_t *edx);
static int cpu_x86_fill_model_id(char *str)
{
uint32_t eax, ebx, ecx, edx;
int i;
for (i = 0; i < 3; i++) {
host_cpuid(0x80000002 + i, 0, &eax, &ebx, &ecx, &edx);
memcpy(str + i * 16 + 0, &eax, 4);
memcpy(str + i * 16 + 4, &ebx, 4);
memcpy(str + i * 16 + 8, &ecx, 4);
memcpy(str + i * 16 + 12, &edx, 4);
}
return 0;
}
static int cpu_x86_fill_host(x86_def_t *x86_cpu_def)
{
uint32_t eax, ebx, ecx, edx;
x86_cpu_def->name = "host";
host_cpuid(0x0, 0, &eax, &ebx, &ecx, &edx);
x86_cpu_def->level = eax;
x86_cpu_def->vendor1 = ebx;
x86_cpu_def->vendor2 = edx;
x86_cpu_def->vendor3 = ecx;
host_cpuid(0x1, 0, &eax, &ebx, &ecx, &edx);
x86_cpu_def->family = ((eax >> 8) & 0x0F) + ((eax >> 20) & 0xFF);
x86_cpu_def->model = ((eax >> 4) & 0x0F) | ((eax & 0xF0000) >> 12);
x86_cpu_def->stepping = eax & 0x0F;
x86_cpu_def->ext_features = ecx;
x86_cpu_def->features = edx;
host_cpuid(0x80000000, 0, &eax, &ebx, &ecx, &edx);
x86_cpu_def->xlevel = eax;
host_cpuid(0x80000001, 0, &eax, &ebx, &ecx, &edx);
x86_cpu_def->ext2_features = edx;
x86_cpu_def->ext3_features = ecx;
cpu_x86_fill_model_id(x86_cpu_def->model_id);
x86_cpu_def->vendor_override = 0;
return 0;
}
static int cpu_x86_find_by_name(x86_def_t *x86_cpu_def, const char *cpu_model)
{
unsigned int i;
@ -326,9 +374,14 @@ static int cpu_x86_find_by_name(x86_def_t *x86_cpu_def, const char *cpu_model)
break;
}
}
if (!def)
goto error;
memcpy(x86_cpu_def, def, sizeof(*def));
if (!def) {
if (strcmp(name, "host") != 0) {
goto error;
}
cpu_x86_fill_host(x86_cpu_def);
} else {
memcpy(x86_cpu_def, def, sizeof(*def));
}
add_flagname_to_bitmaps("hypervisor", &plus_features,
&plus_ext_features, &plus_ext2_features, &plus_ext3_features);