Re: [Xen-devel] Fwd: [xen-4.10-testing bisection] complete test-armhf-armhf-xl-arndale

[Julien Grall <julien.grall@xxxxxxx>]

Hi,

On 6/19/19 8:28 AM, Jan Beulich wrote:
> > > > On 19.06.19 at 09:06, <osstest-admin@xxxxxxxxxxxxxx> wrote:
> > branch xen-4.10-testing
> > xenbranch xen-4.10-testing
> > job test-armhf-armhf-xl-arndale
> > testid debian-install
> >
> > Tree: linux git://xenbits.xen.org/linux-pvops.git
> > Tree: linuxfirmware git://xenbits.xen.org/osstest/linux-firmware.git
> > Tree: ovmf git://xenbits.xen.org/osstest/ovmf.git
> > Tree: qemuu git://xenbits.xen.org/qemu-xen.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:  702c9146c00d65d1e9c5955335ba002505e97e09
> >    Bug not present: 52220b5f437a8d03ba108e127e7d717657edf99c
> >    Last fail repro: http://logs.test-lab.xenproject.org/osstest/logs/138005/
> >
> >
> >    commit 702c9146c00d65d1e9c5955335ba002505e97e09
> >    Author: Julien Grall <julien.grall@xxxxxxx>
> >    Date:   Mon Apr 29 15:05:16 2019 +0100
> >    
> >        xen/arm: Add an isb() before reading CNTPCT_EL0 to prevent re-ordering
> >        
> >        Per D8.2.1 in ARM DDI 0487C.a, "a read to CNTPCT_EL0 can occur
> >        speculatively and out of order relative to other instructions executed
> >        on the same PE."
> >        
> >        Add an instruction barrier to get accurate number of cycles when
> >        requested in get_cycles(). For the other users of CNPCT_EL0, replace by
> >        a call to get_cycles().
> >        
> >        This is part of XSA-295.
> >        
> >        Signed-off-by: Julien Grall <julien.grall@xxxxxxx>
> >        Acked-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
> Just in case you didn't notice this coming in.
I saw it this morning. But I fail to understand how the instruction 
barrier will result in a timeout during the guest installation...
The more this only doesn't seem to appear on staging-4.12.

Cheers,

--
Julien Grall

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