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i386: Make Hyper-V version id configurable

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Currently, we hardcode Hyper-V version id (CPUID 0x40000002) to
WS2008R2 and it is known that certain tools in Windows check this. It
seems useful to provide some flexibility by making it possible to change
this info at will. CPUID information is defined in TLFS as:

EAX: Build Number
EBX Bits 31-16: Major Version
    Bits 15-0: Minor Version
ECX Service Pack
EDX Bits 31-24: Service Branch
    Bits 23-0: Service Number

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20210902093530.345756-8-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2021-09-02 11:35:29 +02:00 • committed by Paolo Bonzini
parent e1f9a8e8c9
commit af7228b88d
4 changed files with 47 additions and 15 deletions
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14
docs/hyperv.txt
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@ -211,6 +211,20 @@ When the option is set to 'on' QEMU will always enable the feature, regardless
of host setup. To keep guests secure, this can only be used in conjunction with
exposing correct vCPU topology and vCPU pinning.
3.20. hv-version-id-{build,major,minor,spack,sbranch,snumber}
=============================================================
This changes Hyper-V version identification in CPUID 0x40000002.EAX-EDX from the
default (WS2008R2).
- hv-version-id-build sets 'Build Number' (32 bits)
- hv-version-id-major sets 'Major Version' (16 bits)
- hv-version-id-minor sets 'Minor Version' (16 bits)
- hv-version-id-spack sets 'Service Pack' (32 bits)
- hv-version-id-sbranch sets 'Service Branch' (8 bits)
- hv-version-id-snumber sets 'Service Number' (24 bits)
Note: hv-version-id-* are not enlightenments and thus don't enable Hyper-V
identification when specified without any other enlightenments.
4. Supplementary features
=========================