rdtsc detected by pafish64

[pradishb]

https://github.com/a0rtega/pafish

configuration:

args: -cpu host,+kvm_pv_unhalt,+kvm_pv_eoi,hv_spinlocks=0x1fff,hv_vapic,hv_time,hv_reset,hv_vpindex,hv_runtime,hv_relaxed,kvm=off,hv_vendor_id=intel,vmware-cpuid-freq=false,enforce=false,host-phys-bits=true,hypervisor=off -smbios type=0,version=UX305UA.201 -smbios type=1,manufacturer=ASUS,product=UX305UA,version=2021.1 -smbios type=2,manufacturer=Intel,version=2021.5,product='Intel i9-12900K' -smbios type=3,manufacturer=XBZJ -smbios type=17,manufacturer=KINGSTON,loc_pfx=DDR5,speed=4800,serial=114514,part=FF63 -smbios type=4,manufacturer=Intel,max-speed=4800,current-speed=4800
audio0: device=ich9-intel-hda,driver=none
balloon: 0
bios: ovmf
boot: order=sata0
cores: 4
cpu: host,flags=+pcid
efidisk0: local-lvm:vm-103-disk-0,efitype=4m,pre-enrolled-keys=1,size=4M
machine: pc-q35-8.0
memory: 4048
meta: creation-qemu=8.0.2,ctime=1695239570
name: test
net0: rtl8139=CA:09:F3:97:56:0B,bridge=vmbr0,firewall=1
numa: 1
ostype: win10
sata0: local-lvm:vm-103-disk-1,size=100G
smbios1: uuid=f8dda7a4-3d2a-43a8-a7c1-3900cfc29e6e,manufacturer=QVNVUw==,product=VVgzMDVVQQ==,version=MjAyMS4x,serial=MTI0NjY3,sku=MTM0NDY4,family=Ng==,base64=1
sockets: 1
usb0: host=4e53:5406
usb1: host=040b:2000
vmgenid:365e32f3-3539-472a-97e5-7cc0e3c62027

built from source: pve-qemu-kvm: 8.0.2-5

[zhaodice]

https://github.com/WCharacter/RDTSC-KVM-Handler (the bad side is your cpu will show low frequency)