54 lines
983 B
C
54 lines
983 B
C
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#include <cpuid.h>
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#include <x86/msr.h>
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#include <x86/cr.h>
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#include "virt.h"
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#include "std.h"
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static bool
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vintel_has_bios_support(void)
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{
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uint64_t value = rdmsr64(IA32_FEATURE_CONTROL);
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return (value & 0x5) == 0x5;
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}
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static bool
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vintel_has_cpu_support(void)
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{
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unsigned info[4];
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__get_cpuid(0x1, &info[0], &info[1], &info[2], &info[3]);
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return (info[2] & (1 << 5)) != 0;
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}
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static bool
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vintel_has_cr4_support(void)
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{
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uint64_t value = readcr4();
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return (value & (1 << 13)) != 0;
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}
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bool
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vintel_has_support(char *err, size_t errmax)
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{
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if (!vintel_has_cpu_support()) {
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strlcpy(err, "CPU does not support VT-x.", errmax);
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return false;
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}
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if (!vintel_has_bios_support()) {
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strlcpy(err, "VT-x support is not enabled in BIOS.", errmax);
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return false;
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}
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if (!vintel_has_cr4_support()) {
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strlcpy(err, "VT-x enable bit is not set in CR4.", errmax);
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return false;
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}
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return true;
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}
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struct virt_vtable virt_vtable_intel = {
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.has_support = vintel_has_support,
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};
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