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Re: [Qemu-devel] [PATCH] q35/mch: implement extended TSEG sizes
From: |
Gerd Hoffmann |
Subject: |
Re: [Qemu-devel] [PATCH] q35/mch: implement extended TSEG sizes |
Date: |
Fri, 09 Jun 2017 22:01:18 +0200 |
On Fri, 2017-06-09 at 13:40 +0200, Paolo Bonzini wrote:
>
> On 08/06/2017 21:55, Michael S. Tsirkin wrote:
> > We don't have room anywhere in PCI config space. Laszlo makes
> > argument
> > why it's safe for this device based on spec but it's anyone's guess
> > whether current and future software will follow spec. In short,
> > going
> > anywhere near the emulated device has a potential to break some
> > drivers.
>
> There are no such drivers. The MCH and PCH are only touched by the
> firmware, not by the OS.
Yea. That is *exactly* the reason why I think simply using the 0x50
offset probably works fine in practice even though I suspect on
physical hardware it might be some undocumented register. Much of the
stuff in the host bridge pci config space is firmware territory, and we
run qemu specific firmware *anyway*.
cheers,
Gerd
- [Qemu-devel] [PATCH] q35/mch: implement extended TSEG sizes, Laszlo Ersek, 2017/06/08
- Re: [Qemu-devel] [PATCH] q35/mch: implement extended TSEG sizes, Paolo Bonzini, 2017/06/08
- 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 <=
- 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, 2017/06/15