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Kernel: Move hypervisor vendor ID string to ProcessorInfo

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This will make it possible to expose it in /proc/cpuinfo. :^)
This commit is contained in:
Linus Groh 2022-04-03 16:58:36 +01:00 committed by Andreas Kling
parent f6181cd47e
commit 8d96525b9d
Notes: sideshowbarker 2024-07-17 14:30:40 +09:00 
Author: https://github.com/linusg
Commit: https://github.com/SerenityOS/serenity/commit/8d96525b9d
Pull-request: https://github.com/SerenityOS/serenity/pull/13482
Reviewed-by: https://github.com/bgianfo ✅
3 changed files with 31 additions and 21 deletions
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3
Kernel/Arch/x86/ProcessorInfo.h
View file

@ -21,6 +21,7 @@ public:
ProcessorInfo(Processor const& processor);
StringView vendor_id_string() const { return m_vendor_id_string->view(); }
StringView hypervisor_vendor_id_string() const { return m_hypervisor_vendor_id_string->view(); }
StringView brand_string() const { return m_brand_string->view(); }
StringView features_string() const { return m_features_string->view(); }
u32 display_model() const { return m_display_model; }
@ -33,10 +34,12 @@ public:
private:
static NonnullOwnPtr<KString> build_vendor_id_string();
static NonnullOwnPtr<KString> build_hypervisor_vendor_id_string(Processor const&);
static NonnullOwnPtr<KString> build_brand_string();
static NonnullOwnPtr<KString> build_features_string(Processor const&);
NonnullOwnPtr<KString> m_vendor_id_string;
NonnullOwnPtr<KString> m_hypervisor_vendor_id_string;
NonnullOwnPtr<KString> m_brand_string;
NonnullOwnPtr<KString> m_features_string;
u32 m_display_model { 0 };

14
Kernel/Arch/x86/common/Processor.cpp
View file

@ -676,18 +676,10 @@ UNMAP_AFTER_INIT void Processor::initialize(u32 cpu)
UNMAP_AFTER_INIT void Processor::detect_hypervisor()
{
CPUID hypervisor_leaf_range(0x40000000);
auto hypervisor_vendor_id_string = m_info->hypervisor_vendor_id_string();
dmesgln("CPU[{}]: CPUID hypervisor signature '{}' ({:#x} {:#x} {:#x}), max leaf {:#x}", current_id(), hypervisor_vendor_id_string, hypervisor_leaf_range.ebx(), hypervisor_leaf_range.ecx(), hypervisor_leaf_range.edx(), hypervisor_leaf_range.eax());
// 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}", current_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)
if (hypervisor_vendor_id_string == "Microsoft Hv"sv)
detect_hypervisor_hyperv(hypervisor_leaf_range);
}

35
Kernel/Arch/x86/common/ProcessorInfo.cpp
View file

@ -14,6 +14,7 @@ namespace Kernel {
ProcessorInfo::ProcessorInfo(Processor const& processor)
: m_vendor_id_string(build_vendor_id_string())
, m_hypervisor_vendor_id_string(build_hypervisor_vendor_id_string(processor))
, m_brand_string(build_brand_string())
, m_features_string(build_features_string(processor))
{
@ -35,21 +36,35 @@ ProcessorInfo::ProcessorInfo(Processor const& processor)
m_display_model = model;
}
}
static void emit_u32(StringBuilder& builder, u32 value)
{
builder.appendff("{:c}{:c}{:c}{:c}",
value & 0xff,
(value >> 8) & 0xff,
(value >> 16) & 0xff,
(value >> 24) & 0xff);
};
NonnullOwnPtr<KString> ProcessorInfo::build_vendor_id_string()
{
CPUID cpuid(0);
StringBuilder builder;
auto emit_u32 = [&](u32 value) {
builder.appendff("{:c}{:c}{:c}{:c}",
value & 0xff,
(value >> 8) & 0xff,
(value >> 16) & 0xff,
(value >> 24) & 0xff);
};
emit_u32(cpuid.ebx());
emit_u32(cpuid.edx());
emit_u32(cpuid.ecx());
emit_u32(builder, cpuid.ebx());
emit_u32(builder, cpuid.edx());
emit_u32(builder, cpuid.ecx());
return KString::must_create(builder.string_view());
}
NonnullOwnPtr<KString> ProcessorInfo::build_hypervisor_vendor_id_string(Processor const& processor)
{
if (!processor.has_feature(CPUFeature::HYPERVISOR))
return KString::must_create({});
CPUID cpuid(0x40000000);
StringBuilder builder;
emit_u32(builder, cpuid.ebx());
emit_u32(builder, cpuid.ecx());
emit_u32(builder, cpuid.edx());
return KString::must_create(builder.string_view());
}