On 12/03/2020 23:56, osstest service owner wrote:
> branch xen-unstable
> xenbranch xen-unstable
> job test-amd64-amd64-qemuu-nested-intel
> testid debian-hvm-install/l1/l2
>
> Tree: linux 
> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
> Tree: linuxfirmware git://xenbits.xen.org/osstest/linux-firmware.git
> Tree: ovmf git://xenbits.xen.org/osstest/ovmf.git
> Tree: qemu git://xenbits.xen.org/qemu-xen-traditional.git
> Tree: qemuu git://xenbits.xen.org/qemu-xen.git
> Tree: seabios git://xenbits.xen.org/osstest/seabios.git
> Tree: xen git://xenbits.xen.org/xen.git
>
> *** Found and reproduced problem changeset ***
>
>   Bug is in tree:  xen git://xenbits.xen.org/xen.git
>   Bug introduced:  f96e1469ad06b61796c60193daaeb9f8a96d7458
>   Bug not present: 0729830cc425a8ff27a3137e87b93768ae3c853c
>   Last fail repro: http://logs.test-lab.xenproject.org/osstest/logs/148496/
>
>
>   commit f96e1469ad06b61796c60193daaeb9f8a96d7458
>   Author: Roger Pau Monné <roger....@citrix.com>
>   Date:   Wed Feb 5 13:49:09 2020 +0100
>   
>       x86/vvmx: fix virtual interrupt injection when Ack on exit control is 
> used
>       
>       When doing a virtual vmexit (ie: a vmexit handled by the L1 VMM)
>       interrupts shouldn't be injected using the virtual interrupt delivery
>       mechanism unless the Ack on exit vmexit control bit isn't set in the
>       nested vmcs.
>       
>       Gate the call to nvmx_update_apicv helper on whether the nested vmcs
>       has the Ack on exit bit set in the vmexit control field.
>       
>       Note that this fixes the usage of x2APIC by the L1 VMM, at least when
>       the L1 VMM is Xen.
>       
>       Signed-off-by: Roger Pau Monné <roger....@citrix.com>
>       Reviewed-by: Kevin Tian <kevin.t...@intel.com>

Looks like there are further problems here.  I'm afraid I haven't
investigated further, but this also might be the source of the
intermittent problems in staging.

~Andrew

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