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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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2
Kernel/Arch/x86/Processor.h
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@ -173,6 +173,8 @@ public:
void early_initialize(u32 cpu); void early_initialize(u32 cpu);
void initialize(u32 cpu); void initialize(u32 cpu);
void detect_hypervisor();
void idle_begin() void idle_begin()
{ {
s_idle_cpu_mask.fetch_or(1u << m_cpu, AK::MemoryOrder::memory_order_relaxed); s_idle_cpu_mask.fetch_or(1u << m_cpu, AK::MemoryOrder::memory_order_relaxed);

18
Kernel/Arch/x86/common/Processor.cpp
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@ -349,6 +349,9 @@ UNMAP_AFTER_INIT void Processor::initialize(u32 cpu)
else else
asm volatile("fnsave %0" asm volatile("fnsave %0"
: "=m"(s_clean_fpu_state)); : "=m"(s_clean_fpu_state));
if (has_feature(CPUFeature::HYPERVISOR))
detect_hypervisor();
} }
m_info = new ProcessorInfo(*this); 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) void Processor::write_raw_gdt_entry(u16 selector, u32 low, u32 high)
{ {
u16 i = (selector & 0xfffc) >> 3; u16 i = (selector & 0xfffc) >> 3;