Qemu loads the processor?

Question

linux

Qemu is very processor intensive, I will be glad for any help, tips or hints.
Guest - windows 7
I start in qemu with forwarding the Nvidia GTX 660 video card
. Guest configuration:

#!/bin/bash
    export QEMU_AUDIO_DRV=alsa QEMU_AUDIO_TIMER_PERIOD=0
    qemu-system-x86_64 \
        -enable-kvm  -M q35 -m 6000 \
        -cpu host,kvm=off  \
        -smp 4,sockets=1,cores=4,threads=1 \
        -vga none \
        -device ioh3420,bus=pcie.0,addr=1c.0,multifunction=on,port=1,chassis=1,id=root.1 \
        -device piix4-ide,bus=pcie.0,id=piix4-ide \
        -device vfio-pci,host=02:00.0,bus=root.1,addr=00.0,multifunction=on,x-vga=on \
        -device vfio-pci,host=02:00.1,bus=pcie.0 \
        -usb  -usbdevice host:04f2:0402 \
        -usb  -usbdevice host:1bcf:0007 \
        -soundhw ac97 \
        -drive file=windows_7_64.img,format=raw \
    ;

As a result, even with almost complete inactivity of the guest, I get the following result:

And the temperature is 80 degrees (even in modern games it is usually less)
Host - Debian 9
percent fx 8320

#cat /etc/modules
vfio
vfio_iommu_type1
vfio_pci
vfio_virqfd


# cat /etc/modprobe.d/local.conf
options vfio-pci ids=10de:11c0,10de:0e0b

#строчка в /etc/default/grub
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash iommu=pt iommu=1 amd_iommu=fullflush radeon.dpm=1"


# lscpu
Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                8
On-line CPU(s) list:   0-7
Thread(s) per core:    1
Core(s) per socket:    8
Socket(s):             1
NUMA node(s):          1
Vendor ID:             AuthenticAMD
CPU family:            21
Model:                 2
Model name:            AMD FX(tm)-8320 Eight-Core Processor
Stepping:              0
CPU MHz:               1400.000
CPU max MHz:           3500,0000
CPU min MHz:           1400,0000
BogoMIPS:              7000.19
Virtualization:        AMD-V
L1d cache:             16K
L1i cache:             64K
L2 cache:              2048K
L3 cache:              8192K
NUMA node0 CPU(s):     0-7

Answer 1

Try these options:
-cpu host,kvm=off,hv_vapic,hv_time,hv_relaxed,hv_spinlocks=0x1fff,hv_vendor_id=NVfix
-machine q35,accel=kvm,mem-merge=off,kernel_irqchip=on