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Detect Virtual Machine

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Fix #90
This commit is contained in:
Xorg 2022-09-15 21:24:43 +02:00
commit ff5aafb5f4
5 changed files with 137 additions and 0 deletions
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61
libcpuid/cpuid_main.c
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@ -568,6 +568,7 @@ static void load_features_common(struct cpu_raw_data_t* raw, struct cpu_id_t* da
{ 28, CPU_FEATURE_AVX },
{ 29, CPU_FEATURE_F16C },
{ 30, CPU_FEATURE_RDRAND },
{ 31, CPU_FEATURE_HYPERVISOR },
};
const struct feature_map_t matchtable_ebx7[] = {
{ 3, CPU_FEATURE_BMI1 },
@ -1180,6 +1181,7 @@ const char* cpu_feature_str(cpu_feature_t feature)
{ CPU_FEATURE_AVX512VNNI, "avx512vnni" },
{ CPU_FEATURE_AVX512VBMI, "avx512vbmi" },
{ CPU_FEATURE_AVX512VBMI2, "avx512vbmi2" },
{ CPU_FEATURE_HYPERVISOR, "hypervisor" },
};
unsigned i, n = COUNT_OF(matchtable);
if (n != NUM_CPU_FEATURES) {
@ -1299,6 +1301,65 @@ void cpuid_get_cpu_list(cpu_vendor_t vendor, struct cpu_list_t* list)
}
}
hypervisor_vendor_t cpuid_get_hypervisor(struct cpu_raw_data_t* raw, struct cpu_id_t* data)
{
int i, r;
uint32_t hypervisor_fn40000000h[NUM_REGS];
char hypervisor_str[VENDOR_STR_MAX];
struct cpu_id_t mydata;
const struct { hypervisor_vendor_t hypervisor; char match[16]; }
matchtable[NUM_HYPERVISOR_VENDORS] = {
/* source: https://github.com/a0rtega/pafish/blob/master/pafish/cpu.c */
{ HYPERVISOR_BHYVE , "bhyve bhyve\0" },
{ HYPERVISOR_HYPERV , "Microsoft Hv" },
{ HYPERVISOR_KVM , "KVMKVMKVM\0\0\0" },
{ HYPERVISOR_PARALLELS , "prl hyperv\0\0" },
{ HYPERVISOR_QEMU , "TCGTCGTCGTCG" },
{ HYPERVISOR_VIRTUALBOX , "VBoxVBoxVBox" },
{ HYPERVISOR_VMWARE , "VMwareVMware" },
{ HYPERVISOR_XEN , "XenVMMXenVMM" },
};
if (!data) {
if ((r = cpu_identify(raw, data)) < 0)
return HYPERVISOR_UNKNOWN;
data = &mydata;
}
/* Intel and AMD CPUs have reserved bit 31 of ECX of CPUID leaf 0x1 as the hypervisor present bit
Source: https://kb.vmware.com/s/article/1009458 */
switch (data->vendor) {
case VENDOR_AMD:
case VENDOR_INTEL:
break;
default:
return HYPERVISOR_UNKNOWN;
}
if (!data->flags[CPU_FEATURE_HYPERVISOR])
return HYPERVISOR_NONE;
/* Intel and AMD have also reserved CPUID leaves 0x40000000 - 0x400000FF for software use.
Hypervisors can use these leaves to provide an interface to pass information
from the hypervisor to the guest operating system running inside a virtual machine.
The hypervisor bit indicates the presence of a hypervisor
and that it is safe to test these additional software leaves. */
memset(hypervisor_fn40000000h, 0, sizeof(hypervisor_fn40000000h));
hypervisor_fn40000000h[EAX] = 0x40000000;
cpu_exec_cpuid_ext(hypervisor_fn40000000h);
/* Copy the hypervisor CPUID information leaf */
memcpy(hypervisor_str + 0, &hypervisor_fn40000000h[1], 4);
memcpy(hypervisor_str + 4, &hypervisor_fn40000000h[2], 4);
memcpy(hypervisor_str + 8, &hypervisor_fn40000000h[3], 4);
hypervisor_str[12] = '\0';
/* Determine hypervisor */
for (i = 0; i < NUM_HYPERVISOR_VENDORS; i++)
if (!strcmp(hypervisor_str, matchtable[i].match))
return matchtable[i].hypervisor;
return HYPERVISOR_UNKNOWN;
}
void cpuid_free_cpu_list(struct cpu_list_t* list)
{
int i;