[libvirt] [PATCH] qemu: Support chardevs with ARM virt machines

Cole Robinson crobinso at redhat.com
Mon Jun 26 19:00:08 UTC 2017

On 06/26/2017 11:19 AM, Andrew Jones wrote:
> On Mon, Jun 26, 2017 at 10:10:55AM -0400, Cole Robinson wrote:
>> On 06/24/2017 10:07 PM, Andrea Bolognani wrote:
>>> On Sat, 2017-06-24 at 16:07 +0200, Christoffer Dall wrote:
>>>> At this point I'm a little confused about how to proceed here.  Would
>>>> you like further evidence of an environment that reproduces the issue
>>>> with console and the isa bus, with additional logic added to this
>>>> patch to fix that, or should we get this patch merged and fix the
>>>> other issue separately?
>>> We can merge the patch without further changes to it, as
>>> it fixes part of the issues that prevent the feature to work.
>>> Actually, I just added
>>> Reviewed-by: Andrea Bolognani <abologna at redhat.com>
>>> and pushed it :)
>> It may fix part of the issue but it likely breaks all existing aarch64 -M virt
>> libvirt VMs. My VM created by virt-manager has:
>>     <serial type='pty'>
>>       <target port='0'/>
>>     </serial>
>>     <console type='pty'>
>>       <target type='serial' port='0'/>
>>     </console>
>> And after this patch fails with:
>> error: Failed to start domain fedora25-aarch64
>> error: internal error: process exited while connecting to monitor:
>> 2017-06-26T13:55:34.726293Z qemu-system-aarch64: -chardev pty,id=charserial0:
>> char device redirected to /dev/pts/5 (label charserial0)
>> 2017-06-26T13:55:34.782121Z qemu-system-aarch64: -device
>> isa-serial,chardev=charserial0,id=serial0: No 'ISA' bus found for device
>> 'isa-serial'
>> There's a few things going on here:
>> - Internally libvirt thinks that by default <serial> is isa-serial
>> - For arm qemu though it's actually a pl011. This is a platform device and as
>> such there isn't any current way to use -chardev with it AFAIK.
> There is,
>  -chardev pty,id=chardev0,logfile=/my/log/file \
>  -serial chardev:chardev0

Ah interesting I didn't know about that, thanks. I sent some patches that
convert to use that method for platform serial devices


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