[Bug 203477] [AMD][KVM] Windows L1 guest becomes extremely slow and unusable after enabling Hyper-V

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https://bugzilla.kernel.org/show_bug.cgi?id=203477

lol123lol125@xxxxxxxxx changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |lol123lol125@xxxxxxxxx

--- Comment #1 from lol123lol125@xxxxxxxxx ---
I am having a similar probably the same issue with proxmox 6/windows server
2019. i am able to boot an ubuntu image as l2 guest. But Either the l1 system
is unresponsive or it crashes with a bluesceen before reaching the gui.
Bluescreens seem to be all watchdog related but vary. (DPC Watchdog
Violation,clock watchdog timeout).



Hardware platform:  
CPU: AMD Ryzen Threadripper 2950X
Board: ASRock X399 Taichi X399-A (SVM, IOMMU related settings enabled in BIOS)


root@pve-master:~# grep -H '' /sys/module/kvm_amd/parameters/*
/sys/module/kvm_amd/parameters/avic:0
/sys/module/kvm_amd/parameters/nested:1
/sys/module/kvm_amd/parameters/npt:1
/sys/module/kvm_amd/parameters/pause_filter_count:3000
/sys/module/kvm_amd/parameters/pause_filter_count_grow:2
/sys/module/kvm_amd/parameters/pause_filter_count_max:65535
/sys/module/kvm_amd/parameters/pause_filter_count_shrink:0
/sys/module/kvm_amd/parameters/pause_filter_thresh:128
/sys/module/kvm_amd/parameters/sev:0
/sys/module/kvm_amd/parameters/vgif:1
/sys/module/kvm_amd/parameters/vls:1

root@pve-master:~# grep -H '' /sys/module/kvm/parameters/*
/sys/module/kvm/parameters/enable_vmware_backdoor:N
/sys/module/kvm/parameters/force_emulation_prefix:N
/sys/module/kvm/parameters/halt_poll_ns:200000
/sys/module/kvm/parameters/halt_poll_ns_grow:0
/sys/module/kvm/parametQers/halt_poll_ns_shrink:0
/sys/module/kvm/parameters/ignore_msrs:Y
/sys/module/kvm/parameters/kvmclock_periodic_sync:Y
/sys/module/kvm/parameters/lapic_timer_advance_ns:4294967295
/sys/module/kvm/parameters/min_timer_period_us:200
/sys/module/kvm/parameters/report_ignored_msrs:N
/sys/module/kvm/parameters/tsc_tolerance_ppm:250
/sys/module/kvm/parameters/vector_hashing:Y


/usr/bin/kvm -id 114 -name server2019 -chardev
socket,id=qmp,path=/var/run/qemu-server/114.qmp,server,nowait -mon
chardev=qmp,mode=control -chardev
socket,id=qmp-event,path=/var/run/qmeventd.sock,reconnect=5 -mon
chardev=qmp-event,mode=control -pidfile /var/run/qemu-server/114.pid -daemonize
-smbios type=1,uuid=8167be1e-8f3d-4667-8535-62a035ebd087 -smp
6,sockets=1,cores=6,maxcpus=6 -nodefaults -boot
menu=on,strict=on,reboot-timeout=1000,splash=/usr/share/qemu-server/bootsplash.jpg
-vnc unix:/var/run/qemu-server/114.vnc,password -no-hpet -cpu
EPYC,+kvm_pv_unhalt,+kvm_pv_eoi,hv_spinlocks=0x1fff,hv_vapic,hv_time,hv_reset,hv_vpindex,hv_runtime,hv_relaxed,hv_synic,hv_stimer,hv_tlbflush,hv_ipi,enforce,vendor=AuthenticAMD
-m 8192 -device vmgenid,guid=53ded4c7-f067-4ae6-8ab0-6a571ccbc1ba -readconfig
/usr/share/qemu-server/pve-q35-4.0.cfg -device
qxl-vga,id=vga,bus=pcie.0,addr=0x1 -spice
tls-port=61000,addr=127.0.0.1,tls-ciphers=HIGH,seamless-migration=on -device
virtio-serial,id=spice,bus=pci.0,addr=0x9 -chardev
spicevmc,id=vdagent,name=vdagent -device
virtserialport,chardev=vdagent,name=com.redhat.spice.0 -device
virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3 -iscsi
initiator-name=iqn.1993-08.org.debian:01:6ff4f776953c -drive
file=/pool_t1/t1_dir//template/iso/virtio-win-0.1.141.iso,if=none,id=drive-ide0,media=cdrom,aio=threads
-device ide-cd,bus=ide.0,unit=0,drive=drive-ide0,id=ide0,bootindex=200 -drive
file=/pool_t1/t1_dir//template/iso/winserver19_17763.1.180914-1434.rs5_release_SERVER_EVAL_x64fre_de-de.iso,if=none,id=drive-ide2,media=cdrom,aio=threads
-device ide-cd,bus=ide.1,unit=0,drive=drive-ide2,id=ide2,bootindex=201 -drive
file=/dev/zvol/pool_t1/vmdata/vm-114-disk-0,if=none,id=drive-virtio0,format=raw,cache=none,aio=native,detect-zeroes=on
-device
virtio-blk-pci,drive=drive-virtio0,id=virtio0,bus=pci.0,addr=0xa,bootindex=100
-netdev
type=tap,id=net0,ifname=tap114i0,script=/var/lib/qemu-server/pve-bridge,downscript=/var/lib/qemu-server/pve-bridgedown,vhost=on
-device
virtio-net-pci,mac=16:72:12:9F:33:FA,netdev=net0,bus=pci.0,addr=0x12,id=net0,bootindex=300
-rtc driftfix=slew,base=localtime -machine type=q35 -global
kvm-pit.lost_tick_policy=discard -cpu host,+svm

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