Re: [Xen-devel] [linux-linus bisection] complete test-amd64-amd64-xl-pvhv2-amd

[Juergen Gross <jgross@xxxxxxxx>]

On 03/04/18 18:55, Sander Eikelenboom wrote:
> On 03/04/18 12:29, Juergen Gross wrote:
>> On 03/04/18 12:19, osstest service owner wrote:
>>> branch xen-unstable
>>> xenbranch xen-unstable
>>> job test-amd64-amd64-xl-pvhv2-amd
>>> testid guest-start
>>>
>>> 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: qemu git://xenbits.xen.org/qemu-xen-traditional.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:  4a5733771e6f33918eba07b584cccce564a67ac1
>>>   Bug not present: 1c2e0f9e4f263714db917eb54f8d1c2d1463ed4c
>>>   Last fail repro: http://logs.test-lab.xenproject.org/osstest/logs/118498/
>>>
>>>
>>>   commit 4a5733771e6f33918eba07b584cccce564a67ac1
>>>   Author: Juergen Gross <jgross@xxxxxxxx>
>>>   Date:   Fri Dec 1 15:14:07 2017 +0100
>>>   
>>>       libxl: put RSDP for PVH guest near 4GB
>>>       
>>>       Instead of locating the RSDP table below 1MB put it just below 4GB
>>>       like the rest of the ACPI tables in case of PVH guests. This will
>>>       avoid punching more holes than necessary into the memory map.
>>>       
>>>       Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
>>>       Acked-by: Wei Liu <wei.liu2@xxxxxxxxxx>
>>>       Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
>>
>> The corresponding Linux kernel patch just made it upstream.
>>
>>
>> Juergen
> 
> Hi Juergen,
> 
> Are those kernel patches heading for linux-stable as well ?

That was the plan. They'll probably need some adjustments.

> 
> I ask this, because it would be nice to be able to use PVH on Xen 4.11 
> release with a distro kernel
> (4.9 or 4.14 stable for instance for Debian).
> PVH worked fine with xen-4.11-to-be up until this commit, so the kernel 
> patches fix this (non-kernel) regression.

This _is_ a kernel regression as the kernel didn't comply to the
PVH ABI. It relied on a not guaranteed behavior of Xen.


Juergen

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