Re: [PATCH v3 14/22] microvm: use 2G split unconditionally

[Igor Mammedov]

On Mon, 25 May 2020 13:45:08 +0200
Gerd Hoffmann <address@hidden> wrote:

> On Thu, May 21, 2020 at 11:29:21AM +0200, Igor Mammedov wrote:
> > On Wed, 20 May 2020 15:19:55 +0200
> > Gerd Hoffmann <address@hidden> wrote:
> >   
> > > Looks like the logiv was copied over from q35.
> > > 
> > > q35 does this for backward compatibility, there is no reason to do this
> > > on microvm though.  So split @ 2G unconditionally.  
> > 
> > not related to your ACPI rework, but just an idea for future of microvm
> > 
> > I wonder if we should carry over all this fixed RAM layout legacy from 
> > pc/q35
> > with a bunch of knobs to tweak it (along with complicated logic).  
> 
> Well, I think we can (should) drop max-ram-below-4g too.  There is
> no reason to use that with microvm, other that shooting yourself into
> the foot (by making mmio overlap with ram).
> 
> With that being gone too there isn't much logic left ...

I wonder if we need 2G split for microvm at all?
Can we map 1 contiguous big blob from 0 GPA and overlay bios & other x86 TOLUD 
stuff?


> take care,
>   Gerd
>