Also affects me when running Qemu 4.0.0 with -machine pc-q35-3.1. I get
this on the command line:
"qemu-system-x86_64: vhost_region_add_section: Overlapping but not
coherent sections at 11a000".
h/w: AMD Ryzen 3900X, Gigabyte Aorus Pro X570 (latest BIOS), kernel
5.3.0.
With -machine q35 (i.e. pc-q35-4.0) the machine crashes when soundhw is
specified. Here the quick and dirty command line:
qemu-system-x86_64 \
-enable-kvm \
-runas user \
-serial none \
-parallel none \
-nodefaults \
-name $vmname,process=$vmname \
-machine pc-q35-3.1,accel=kvm,mem-merge=off,vmport=off \
-cpu
host,kvm=off,+topoext,hv_vendor_id=1234567890ab,hv_vapic,hv_time,hv_relaxed,hv_spinlocks=0x1fff,hv_crash,hv_reset,hv_vpindex,hv_runtime,hv_synic,hv_stimer
\
-smp 24,sockets=1,cores=12,threads=2 \
-global ICH9-LPC.disable_s3=1 \
-global ICH9-LPC.disable_s4=1 \
-m 48G \
-mem-path /dev/hugepages \
-mem-prealloc \
-rtc base=localtime,clock=host,driftfix=slew \
-soundhw hda \
-audiodev pa,id=pa1,server=/run/user/1000/pulse/native \
-vga none \
-nographic \
-usb \
-device usb-host,vendorid=0x046d,productid=0xc52b \
-device ioh3420,id=root_port1,chassis=1,bus=pcie.0,addr=03.0 \
-device
vfio-pci,host=0b:00.0,id=hostdev1,bus=root_port1,addr=0x00,multifunction=on \
-device vfio-pci,host=0b:00.1,id=hostdev2,bus=root_port1,addr=0x00.1 \
-drive if=pflash,format=raw,readonly,file=/usr/share/OVMF/OVMF_CODE.fd \
-drive if=pflash,format=raw,file=/tmp/my_vars.fd \
...
--
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1811533
Title:
Unstable Win10 guest with qemu 3.1 + huge pages + hv_stimer
Status in QEMU:
Confirmed
Bug description:
Host:
Gentoo linux x86_64, kernel 4.20.1
Qemu 3.1.0
CPU: Intel i7 6850K
Chipset: X99
Guest:
Windows 10 Pro 64bit (1809)
Machine type: pc-q35_3.1
Hyper-V enlightenments:
hv_stimer,hv_reenlightenment,hv_frequencies,hv_vapic,hv_reset,hv_synic,hv_runtime,hv_vpindex,hv_time,hv_relaxed,hv_spinlocks=0x1fff
Memory: 16GB backed by 2MB huge pages
Issue:
Once guest is started, log gets flooded with:
qemu-system-x86_64: vhost_region_add_section: Overlapping but not
coherent sections at 103000
or
qemu-system-x86_64: vhost_region_add_section:Section rounded to 0
prior to previous 1f000
(line endings change)
and as time goes guest loses network access (virtio-net-pci) and
general performance diminishes to extent of freezing applications.
Observations:
1) problem disappears when hv_stimer is removed
2) problem disappears when memory backing with huge pages is disabled
3) problem disappears when machine type is downgraded to pc-q35_3.0
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