Re: [PATCH 3/3] libxl: add .domainSendKey

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Tue, Dec 09, 2014 at 11:19:22PM -0700, Chun Yan Liu wrote:
> 
> 
> >>> On 12/9/2014 at 05:44 PM, in message <20141209094444.GB29167@xxxxxxxxxx>,
> "Daniel P. Berrange" <berrange@xxxxxxxxxx> wrote: 
> > On Tue, Dec 09, 2014 at 11:27:46AM +0800, Chunyan Liu wrote: 
> > > libxl supports sysrq. Add .domainSendKey function to support 
> > > sending sysrq key. 
> >  
> > I think this is really bending the semantics of the virDomainSendKey 
> > API too much.  This API is documented to inject *any* scancodes into 
> > the guest operating system. Implementing it in such a way that you 
> > can only send sysrq key sequences to the guest kernel is not what 
> > applications will expect when they try to use this API. So NACK to 
> > this patch 
> >  
> > I'm open to the idea of adding an explicit API for triggering the 
> > sysrq sequence though. eg virDomainSendSysRequest or something 
> > like that, if you really want access to sysrq via the API.
> 
> Libxl now has no ability to send any key sequence to guest kernel
> but supports sending sysrq key. We just want a way to send sysrq key,
> so adding new  virDomainSendSysRequest API is OK to me.
> 
> Meanwhile, that means:
> Adding .domainSendSysRequest to virHypervisorDriver?
> And in virsh, add a new 'virsh sysrq' command or update code of
> cmdSendKey to handle sysrq key sequence? (like if .domainSendKey is
> not supported by driver, check if it is sysrq key sequence, if yes, try
> virDomainSysRequest if driver supports that.)

Yes pretty much, but I wouldn't do anything with domainSendKey. Apps can
choose to try to use domainSendKey if domainSysRequest isn't supported.

Regards,
Daniel
-- 
|: http://berrange.com      -o-    http://www.flickr.com/photos/dberrange/ :|
|: http://libvirt.org              -o-             http://virt-manager.org :|
|: http://autobuild.org       -o-         http://search.cpan.org/~danberr/ :|
|: http://entangle-photo.org       -o-       http://live.gnome.org/gtk-vnc :|

--
libvir-list mailing list
libvir-list@xxxxxxxxxx
https://www.redhat.com/mailman/listinfo/libvir-list




[Index of Archives]     [Virt Tools]     [Libvirt Users]     [Lib OS Info]     [Fedora Users]     [Fedora Desktop]     [Fedora SELinux]     [Big List of Linux Books]     [Yosemite News]     [KDE Users]     [Fedora Tools]