diff options
| author | Vitaly Kuznetsov <vkuznets@redhat.com> | 2021-09-02 11:35:29 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-10-01 19:04:45 +0200 |
| commit | af7228b88dbe80ed5d5258b49be8b48ab351a476 (patch) | |
| tree | 7d1b022cca7cdd2a7839fa16144ff77c18909646 /docs | |
| parent | e1f9a8e8c90ae54387922e33e5ac4fd759747d01 (diff) | |
i386: Make Hyper-V version id configurable
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>
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/hyperv.txt | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/docs/hyperv.txt b/docs/hyperv.txt index cd1ea3bbe9..7803495468 100644 --- a/docs/hyperv.txt +++ b/docs/hyperv.txt @@ -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 ========================= |