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Poor performance with -accel whpx on Server 2022 host, windows 10 guest - missing CPUID hypervisor ident data?
Description of problem:
**Performance of Windows 10 x64 QEMU virtual machine is essentially unusable, compared to same image running under Hyper-V on the same host system.**
It appears the VM is not being provided the Hyper-V enlightenment hints while running under QEMU. The hv-XXX cpu options do not appear applicable to -accel WHPX.
Below are dumps of the 0x40000000 cpuid values on the host, QEMU guest, and Hyper-V guest (exact same .VHD file used, nested virtualization not enabled for this VM).
host:
- 0x40000000 eax=4000000c ebx=7263694d ecx=666f736f edx=76482074
- 0x40000001 eax=31237648 ebx=0 ecx=0 edx=0
- 0x40000002 eax=4f7c ebx=a0000 ecx=2 edx=85d
- 0x40000003 eax=bfff ebx=2bb9ff ecx=22 edx=71fffbf6
- 0x40000004 eax=50d1c ebx=fff ecx=0 edx=0
- 0x40000005 eax=400 ebx=400 ecx=ba00 edx=0
- 0x40000006 eax=1e00be ebx=0 ecx=0 edx=0
- 0x40000007 eax=80000007 ebx=3 ecx=0 edx=0
- 0x40000008 eax=100001 ebx=1 ecx=aaaa edx=0
- 0x40000009 eax=0 ebx=0 ecx=0 edx=0
- 0x4000000a eax=0 ebx=0 ecx=0 edx=0
- 0x4000000b eax=0 ebx=0 ecx=0 edx=0
- 0x4000000c eax=0 ebx=0 ecx=0 edx=0
qemu guest with -accel whpx :
- 0x40000000 eax=40000010 ebx=0 ecx=0 edx=0
- 0x40000001 eax=0 ebx=0 ecx=0 edx=0
- 0x40000002 eax=0 ebx=0 ecx=0 edx=0
- 0x40000003 eax=0 ebx=0 ecx=0 edx=0
- 0x40000004 eax=0 ebx=0 ecx=0 edx=0
- 0x40000005 eax=0 ebx=0 ecx=0 edx=0
- 0x40000006 eax=0 ebx=0 ecx=0 edx=0
- 0x40000007 eax=0 ebx=0 ecx=0 edx=0
- 0x40000008 eax=0 ebx=0 ecx=0 edx=0
- 0x40000009 eax=0 ebx=0 ecx=0 edx=0
- 0x4000000a eax=0 ebx=0 ecx=0 edx=0
- 0x4000000b eax=0 ebx=0 ecx=0 edx=0
- 0x4000000c eax=0 ebx=0 ecx=0 edx=0
- 0x4000000d eax=0 ebx=0 ecx=0 edx=0
- 0x4000000e eax=0 ebx=0 ecx=0 edx=0
- 0x4000000f eax=0 ebx=0 ecx=0 edx=0
- 0x40000010 eax=225519 ebx=30d40 ecx=0 edx=0
hyperv guest VM: (nested virtualization not enabled)
- 0x40000000 eax=4000000b ebx=7263694d ecx=666f736f edx=76482074
- 0x40000001 eax=31237648 ebx=0 ecx=0 edx=0
- 0x40000002 eax=4f7c ebx=a0000 ecx=2 edx=85d
- 0x40000003 eax=ae7f ebx=388030 ecx=22 edx=e0bed7b2
- 0x40000004 eax=40c2c ebx=fff ecx=0 edx=0
- 0x40000005 eax=f0 ebx=400 ecx=ba00 edx=0
- 0x40000006 eax=e ebx=0 ecx=0 edx=0
- 0x40000007 eax=0 ebx=0 ecx=0 edx=0
- 0x40000008 eax=0 ebx=0 ecx=0 edx=0
- 0x40000009 eax=0 ebx=0 ecx=0 edx=0
- 0x4000000a eax=0 ebx=0 ecx=0 edx=0
- 0x4000000b eax=0 ebx=0 ecx=0 edx=0
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