Re: [Xen-devel] [PATCH v2] gic: drop interrupts enabling on interrupts processing

[Andre Przywara <andre.przywara@xxxxxxx>]

On Fri, 31 May 2019 18:16:52 +0100
Julien Grall <julien.grall@xxxxxxx> wrote:

> Hi,
> 
> On 30/05/2019 17:14, Andrii Anisov wrote:
> > 
> > 
> > On 29.05.19 18:32, Julien Grall wrote:  
> >>> BTW, do you hear about plans for the new vgic? Some time ago it was said 
> >>> that 
> >>> new vgic implementation going to replace the old one, and optimizing the 
> >>> old 
> >>> is worthless. But as I see, there are no updates into that area yet.  
> >>
> >> We need help to make it happen.  
> > I'm not sure I'll have spare time soon, but what kind of help you need? Do 
> > you 
> > have a TODO list?  
> 
>  From the top of my head the major blocker is GICv3 (+ ITS) support. It 
> mostly 
> need to be ported from Linux.
> 
> There were also a couple of concern regarding using ordering the list while 
> folding (can't remember if this was addressed in Linux).
> 
> @Andre, I thought we capture that in Xen Project jira but I can't find it. 
> Did 
> you keep a list?

I thought Jira as well, but apparently we never actually did this :-(

So yes, GICv3 support is the showstopper here, this would allow us to make the 
new VGIC the default, since we would have feature parity.

Also we would need to check the git log in Linux for the individual VGIC files 
to port over fixes, if applicable. Due to the different coding style and 
renamed identifiers, comparing the files does not really help.

Cheers,
Andre.

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