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Kernel: Detect and display CPUID hypervisor signature

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This commit is contained in:
Jean-Baptiste Boric 2021-07-11 19:45:11 +02:00 • committed by Andreas Kling
parent 4cc346fb19
commit b22357b17b
2 changed files with 20 additions and 0 deletions
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18
Kernel/Arch/x86/common/Processor.cpp
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@ -349,6 +349,9 @@ UNMAP_AFTER_INIT void Processor::initialize(u32 cpu)
else
asm volatile("fnsave %0"
: "=m"(s_clean_fpu_state));
if (has_feature(CPUFeature::HYPERVISOR))
detect_hypervisor();
}
m_info = new ProcessorInfo(*this);
@ -360,6 +363,21 @@ UNMAP_AFTER_INIT void Processor::initialize(u32 cpu)
}
}
UNMAP_AFTER_INIT void Processor::detect_hypervisor()
{
CPUID hypervisor_leaf_range(0x40000000);
// Get signature of hypervisor.
alignas(sizeof(u32)) char hypervisor_signature_buffer[13];
*reinterpret_cast<u32*>(hypervisor_signature_buffer) = hypervisor_leaf_range.ebx();
*reinterpret_cast<u32*>(hypervisor_signature_buffer + 4) = hypervisor_leaf_range.ecx();
*reinterpret_cast<u32*>(hypervisor_signature_buffer + 8) = hypervisor_leaf_range.edx();
hypervisor_signature_buffer[12] = '\0';
StringView hypervisor_signature(hypervisor_signature_buffer);
dmesgln("CPU[{}]: CPUID hypervisor signature '{}' ({:#x} {:#x} {:#x}), max leaf {:#x}", id(), hypervisor_signature, hypervisor_leaf_range.ebx(), hypervisor_leaf_range.ecx(), hypervisor_leaf_range.edx(), hypervisor_leaf_range.eax());
}
void Processor::write_raw_gdt_entry(u16 selector, u32 low, u32 high)
{
u16 i = (selector & 0xfffc) >> 3;