From: Julien Grall <julien.grall@arm.com>
To: Jan Beulich <JBeulich@suse.com>,
Stefano Stabellini <sstabellini@kernel.org>
Cc: xen-devel <xen-devel@lists.xenproject.org>
Subject: Re: [Xen-devel] Fwd: [xen-4.10-testing bisection] complete test-armhf-armhf-xl-arndale
Date: Wed, 19 Jun 2019 10:02:56 +0100 [thread overview]
Message-ID: <60ff0360-50be-8545-45d8-799ef9fcb95b@arm.com> (raw)
In-Reply-To: <5D09E4310200007800239852@prv1-mh.provo.novell.com>
Hi,
On 6/19/19 8:28 AM, Jan Beulich wrote:
>>>> On 19.06.19 at 09:06, <osstest-admin@xenproject.org> 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@arm.com>
>> 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@arm.com>
>> Acked-by: Stefano Stabellini <sstabellini@kernel.org>
>
> 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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next prev parent reply other threads:[~2019-06-19 9:03 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <2B31D2BD02000066A2327079@prv1-mh.provo.novell.com>
2019-06-19 7:28 ` [Xen-devel] Fwd: [xen-4.10-testing bisection] complete test-armhf-armhf-xl-arndale Jan Beulich
2019-06-19 9:02 ` Julien Grall [this message]
2019-06-19 15:59 ` Julien Grall
2019-06-19 16:56 ` Stefano Stabellini
2019-06-20 17:24 ` Julien Grall
2019-06-20 23:55 ` Stefano Stabellini
2019-06-21 8:58 ` Jan Beulich
2019-06-21 9:14 ` Julien Grall
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