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doc: Add entry about vendor ID normalization
Add an entry about vendor ID normalization that updates the guest CPUID's vendor ID with the host value. Signed-off-by: Takahiro Itazuri <[email protected]>
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‎docs/cpu_templates/cpuid-normalization.md

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@@ -11,20 +11,21 @@ See also: [boot protocol settings](boot-protocol.md)
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## x86_64 common CPUID normalization
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| Description | Leaf | Subleaf | Register | Bits |
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|--------------------------------------------------------------------------------------|:----------:|:-------:|:--------:|:-----:|
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| Set CLFLUSH line size | 0x1 | - | EBX | 15:8 |
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| Set maximum number of addressable IDs for logical processors in the physical package | 0x1 | - | EBX | 23:16 |
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| Set initial APIC ID | 0x1 | - | EBX | 31:24 |
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| Disable PDCM (Perfmon and Debug Capability) | 0x1 | - | ECX | 15 |
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| Enable TSC_DEADLINE | 0x1 | - | ECX | 24 |
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| Enable HYPERVISOR | 0x1 | - | ECX | 31 |
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| Set HTT value if the microVM's CPU count is greater than 1 | 0x1 | - | EDX | 28 |
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| Insert leaf 0xb, subleaf 0x1 filled with `0` if it is not already present | 0xb | 0x1 | all | all |
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| Update extended topology enumeration | 0xb | all | EAX | 4:0 |
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| Update extended topology enumeration | 0xb | all | EBX | 15:0 |
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| Update extended topology enumeration | 0xb | all | ECX | 15:8 |
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| Pass through cache information from host | 0x80000006 | - | all | all |
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| Description | Leaf | Subleaf | Register | Bits |
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|--------------------------------------------------------------------------------------|:----------:|:-------:|:-------------:|:-----:|
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| Pass through vendor ID from host | 0x0 | - | EBX, ECX, EDX | all |
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| Set CLFLUSH line size | 0x1 | - | EBX | 15:8 |
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| Set maximum number of addressable IDs for logical processors in the physical package | 0x1 | - | EBX | 23:16 |
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| Set initial APIC ID | 0x1 | - | EBX | 31:24 |
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| Disable PDCM (Perfmon and Debug Capability) | 0x1 | - | ECX | 15 |
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| Enable TSC_DEADLINE | 0x1 | - | ECX | 24 |
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| Enable HYPERVISOR | 0x1 | - | ECX | 31 |
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| Set HTT value if the microVM's CPU count is greater than 1 | 0x1 | - | EDX | 28 |
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| Insert leaf 0xb, subleaf 0x1 filled with `0` if it is not already present | 0xb | 0x1 | all | all |
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| Update extended topology enumeration | 0xb | all | EAX | 4:0 |
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| Update extended topology enumeration | 0xb | all | EBX | 15:0 |
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| Update extended topology enumeration | 0xb | all | ECX | 15:8 |
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| Pass through cache information from host | 0x80000006 | - | all | all |
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## Intel-specific CPUID normalization
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