Re: [Xen-devel] booting domU guest as pvh works in xen-4.11.1 but fails in 4.12

[M A Young <m.a.young@xxxxxxxxxxxx>]

On Mon, 15 Apr 2019, Pry Mar wrote:

> Hello,
> 
> https://paste.debian.net/1077718/
> 
> I get a kernel panic as shown in the paste above no matter how I
> launch pvh, with bootloader (pygrub), kernel direct (4.18+), or
> pvgrub2 (i386-xen_pvh support).
> 
> The dom0 here is ub1804, kernel-4.18, and xen-4.12 with debian
> packages (self built).
> ~$ sudo dpkg -l | grep -P 'xen|qemu' | grep '^ii'
> ii  libxen-4.12:amd64      4.12.0-1+ub18u04.1                amd64
>    Public libs for Xen
> ii  libxenstore3.0:amd64  4.12.0-1+ub18u04.1                amd64
>   Xenstore communications library for Xen
> ii  libxentoolcore1:amd64  4.12.0-1+ub18u04.1                amd64
>    helper for qemu & libxenstore
> ii  qemuu     3.1.0-1+ub18u04.1                 amd64
> qemu-system-i386 (3.1.0/xen-4.12) with 9pfs support
> ii  xen-hypervisor-4.12-amd64             4.12.0-1+ub18u04.1
>      amd64        Xen Hypervisor on AMD64
> ii  xen-utils-4.12                        4.12.0-1+ub18u04.1
>      amd64        XEN administrative tools
> ii  xen-utils-common                      4.12.0-1+ub18u04.1
>      all          Xen administrative tools - common files
> ii  xen-virbr0                            0.1-2
>      all          Setup a virbr0 bridge and dnsmasq on a
> ii  xenstore-utils                        4.12.0-1+ub18u04.1
>      amd64        Xenstore command line utilities for Xen
> 
> The same xl config and grub config works in xen-4.11.1. I've searched
> for any new options in xl.cfg that could influence this, but nothing
> catches my eye.
> 
> I get the same dmesg in other boot methods, but the i386-xen_pvh style
> yields more info at the end. The (fire-missle) grub script is provided
> Hans van Kranenburg .
> 
> Before the initrd unpacks I see many errors (line 201 of paste):
> fuse init modprobe trap invalid opcode ip:7f797dc7bb95
> 
> But later the xen_netfront and xen_blkfront drivers load fine and then
> trouble starts.
> 
> PryMar56,
> ##xen-packaging on Freenode IRC

I have seen a similar crash on Fedora on a F30 guest that works with PV 
but crashes with HVM on 4.12 but not on 4.11.1. I am seeing similar 
behaviour on a Windows 10 HVM guest, though that is harder to diagnose.

        Michael Young

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