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Re: [Qemu-devel] [PATCH] q35/mch: implement extended TSEG sizes
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCH] q35/mch: implement extended TSEG sizes |
Date: |
Fri, 16 Jun 2017 06:23:59 +0300 |
On Thu, Jun 15, 2017 at 09:07:45AM +0200, Gerd Hoffmann wrote:
> Hi,
>
> > To be specific, what I meant is a bit that tells guest that a
> > config space register is available, and lets host find out
> > that guest is going to use it.
> >
> > This to ensure full forward and backward compatibility.
> >
> > I agree a fw cfg file for a single bit seems like an overkill, that's
> > why I thought sharing feature files with SMI would be a good idea.
> >
> > Do you see an issue with that?
>
> The point of placing the extended-tseg-size register in mch pci config
> is that the firmware can figure this easily *without* looking somewhere
> else, as all the other tseg (and smram) config bits are in mch pci
> config space too.
>
> When involving fw_cfg there is no reason to keep the extended-tseg-size
> register in mch. We can simply place a "etc/q35-extended-tseg-size"
> file in fw_cfg then (which is either not present or contains the
> extended tseg size). So a feature bit in fw_cfg looks absolutely
> pointless to me.
>
> I still think the approach and patch by Laszlo is perfectly fine.
> While being at it:
>
> Reviewed-by: Gerd Hoffmann <address@hidden>
>
> cheers,
> Gerd
I guess I'll merge it and we'll see if there's any fallout.
Thanks everyone.
--
MST
- Re: [Qemu-devel] [PATCH] q35/mch: implement extended TSEG sizes, (continued)
- Re: [Qemu-devel] [PATCH] q35/mch: implement extended TSEG sizes, Michael S. Tsirkin, 2017/06/08
- Re: [Qemu-devel] [PATCH] q35/mch: implement extended TSEG sizes, Paolo Bonzini, 2017/06/09
- Re: [Qemu-devel] [PATCH] q35/mch: implement extended TSEG sizes, Gerd Hoffmann, 2017/06/09
- Re: [Qemu-devel] [PATCH] q35/mch: implement extended TSEG sizes, Michael S. Tsirkin, 2017/06/14
- Re: [Qemu-devel] [PATCH] q35/mch: implement extended TSEG sizes, Gerd Hoffmann, 2017/06/15
- Re: [Qemu-devel] [PATCH] q35/mch: implement extended TSEG sizes,
Michael S. Tsirkin <=