I have been using this patch
https://patchwork.kernel.org/patch/11346881/ on qemu 4.2 as a fix since
January without any ill effects. It is already included into qemu 5.0
rc0 and rc1, so it seems qemu 5.0 will be free from this bug.
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I have applied these patches on qemu 4.2 and it seems they do fix the
problem: no more vhost_region_add_section in the log, and I haven't
observed network or general performance loss in the span of one hour.
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As asked by dgilbert-h, I am attaching my qemu command line. It is
ripped from libvirt log.
** Attachment added: "Bug reproducing Qemu command line from libvirt log."
https://bugs.launchpad.net/qemu/+bug/1811533/+attachment/5290067/+files/qemu_cmdln.txt
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Another observation:
Adding CPU flag x-hv-synic-kvm-only also fixes the issue, because it switches
only synic to Qemu 3.0 behavior, leaving other features of > Qemu 3.0 available.
This observation can be related to this commit:
Other users are having similar issues:
https://github.com/virtio-win/kvm-guest-drivers-windows/issues/402
https://www.reddit.com/r/VFIO/comments/cc2473/virtio_network_drivers_failing_on_win10_guest/etk6f6i/
** Bug watch added: github.com/virtio-win/kvm-guest-drivers-windows/issues #402
** Changed in: qemu
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1811533
Title:
Unstable Win10 guest with qemu 3.1 + huge pages + hv_stimer
Status in QEMU:
Refresh: still happening with Qemu 4.0 and Kernel 5.2.
One additional observation:
4) problem disappears when vhost is disabled.
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https://bugs.launchpad.net/bugs/1811533
Title:
Public bug reported:
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:
