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Re: Ryzen 6000 (Mobile)
- To: Dylanger Daly <dylangerdaly@xxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 6 Sep 2022 12:52:25 +0200
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, Andrew.Cooper3@xxxxxxxxxx
- Delivery-date: Tue, 06 Sep 2022 21:50:04 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 29.08.2022 17:26, Dylanger Daly wrote:
> Please see the attached iomem and meminfo text files from both Qubes under
> Xen and functional Fedora Workstation.
>
> After some investigation, I've seen that I'm able to run a few small VMs just
> fine, however as soon as I start a larger VM, PCI devices appear to stop
> working, I assume this is because AMD moved PCI register addresses and Xen
> doesn't know about this change, so it's mapping this memory for other appVMs
> to use, resulting in weird behavior? Does that sound correct?
Not really, no. Even if BARs were moved, they still shouldn't overlap RAM.
But yes, BARs moving without Xen knowing would already be a problem. But
then the basic question is: Why would BARs be moved? The only reason I
could see (in the context of VM creation) is if PCI pass-through was
involved. Iirc you said it isn't, though.
Jan
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