Re: PV guest with PCI passthrough crash on Xen 4.8.3 inside KVM when booted through OVMF

[Andrew Cooper <andrew.cooper3@citrix.com>]

On 16/02/18 17:48, Marek Marczykowski-Górecki wrote:
> Hi,
>
> As in the subject, the guest crashes on boot, before kernel output
> anything. I've isolated this to the conditions below:
>  - PV guest have PCI device assigned (e1000e emulated by QEMU in this case),
>    without PCI device it works
>  - Xen (in KVM) is started through OVMF; with seabios it works
>  - nested HVM is disabled in KVM
>  - AMD IOMMU emulation is disabled in KVM; when enabled qemu crashes on
>    boot (looks like qemu bug, unrelated to this one)
>
> Version info:
>  - KVM host: OpenSUSE 42.3, qemu 2.9.1, ovmf-2017+git1492060560.b6d11d7c46-4.1, AMD
>  - Xen host: Xen 4.8.3, dom0: Linux 4.14.13
>  - Xen domU: Linux 4.14.13, direct boot
>
> Not sure if relevant, but initially I've tried booting xen.efi /mapbs
> /noexitboot and then dom0 kernel crashed saying something about conflict
> between e820 and kernel mapping. But now those options are disabled.
>
> The crash message:
> (XEN) d1v0 Unhandled invalid opcode fault/trap [#6, ec=0000]
> (XEN) domain_crash_sync called from entry.S: fault at ffff82d080218720 entry.o#create_bounce_frame+0x137/0x146
> (XEN) Domain 1 (vcpu#0) crashed on cpu#1:
> (XEN) ----[ Xen-4.8.3  x86_64  debug=n   Not tainted ]----
> (XEN) CPU:    1
> (XEN) RIP:    e033:[<ffffffff826d9156>]

This is #UD, which is most probably hitting a BUG().  addr2line this ^
to find some code to look at.

~Andrew

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