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Kernel: Detect and display CPUID Hyper-V data

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This commit is contained in:
Jean-Baptiste Boric 2021-07-11 22:57:09 +02:00 • committed by Andreas Kling
parent b22357b17b
commit 528574d958
2 changed files with 33 additions and 0 deletions
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32
Kernel/Arch/x86/common/Processor.cpp
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@ -376,6 +376,38 @@ UNMAP_AFTER_INIT void Processor::detect_hypervisor()
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());
if (hypervisor_signature == "Microsoft Hv"sv)
detect_hypervisor_hyperv(hypervisor_leaf_range);
}
UNMAP_AFTER_INIT void Processor::detect_hypervisor_hyperv(CPUID const& hypervisor_leaf_range)
{
if (hypervisor_leaf_range.eax() < 0x40000001)
return;
CPUID hypervisor_interface(0x40000001);
// Get signature of hypervisor interface.
alignas(sizeof(u32)) char interface_signature_buffer[5];
*reinterpret_cast<u32*>(interface_signature_buffer) = hypervisor_interface.eax();
interface_signature_buffer[4] = '\0';
StringView hyperv_interface_signature(interface_signature_buffer);
dmesgln("CPU[{}]: Hyper-V interface signature '{}' ({:#x})", id(), hyperv_interface_signature, hypervisor_interface.eax());
if (hypervisor_leaf_range.eax() < 0x40000001)
return;
CPUID hypervisor_sysid(0x40000002);
dmesgln("CPU[{}]: Hyper-V system identity {}.{}, build number {}", id(), hypervisor_sysid.ebx() >> 16, hypervisor_sysid.ebx() & 0xFFFF, hypervisor_sysid.eax());
if (hypervisor_leaf_range.eax() < 0x40000005 || hyperv_interface_signature != "Hv#1"sv)
return;
dmesgln("CPU[{}]: Hyper-V hypervisor detected", id());
// TODO: Actually do something with Hyper-V.
}
void Processor::write_raw_gdt_entry(u16 selector, u32 low, u32 high)