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i386/cpu/hyperv: support over 64 vcpus for windows guests

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Starting with Windows Server 2012 and Windows 8, if
CPUID.40000005.EAX contains a value of -1, Windows assumes specific
limit to the number of VPs. In this case, Windows Server 2012
guest VMs may use more than 64 VPs, up to the maximum supported
number of processors applicable to the specific Windows
version being used.

https://docs.microsoft.com/en-us/virtualization/hyper-v-on-windows/reference/tlfs

For compatibility, Let's introduce a new property for X86CPU,
named "x-hv-max-vps" as Eduardo's suggestion, and set it
to 0x40 before machine 2.10.

(The "x-" prefix indicates that the property is not supposed to
be a stable user interface.)

Backports relevant parts of commit 6c69dfb67e84747cf071958594d939e845dfcc0c from qemu
This commit is contained in:
Gonglei 2018-03-05 00:00:21 -05:00 committed by Lioncash
parent a237d9dbca
commit ce71be5c05
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qemu/target/i386/cpu.h
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@ -1253,6 +1253,8 @@ typedef struct X86CPU {
int32_t core_id;
int32_t thread_id;
int32_t hv_max_vps;
/* Features to be added */
FeatureWordArray plus_features;
/* Features to be removed */