Re: [Xen-devel] [PATCH] AMD/IOMMU: revert "amd/iommu: assign iommu devices to Xen"

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 05.06.19 at 11:06, <roger.pau@xxxxxxxxxx> wrote:
> On Wed, Jun 05, 2019 at 01:55:42AM -0600, Jan Beulich wrote:
>> >>> On 04.06.19 at 18:20, <roger.pau@xxxxxxxxxx> wrote:
>> > On a tangential note, there's also a dereference of dom_xen in
>> > _pci_hide_device which doesn't trigger a page fault. Do we have
>> > something mapped at linear address 0 on purpose?
>> 
>> Yes, during early (legacy) boot.
> 
> FWIW, I'm booting from UEFI using multiboot2 and I didn't get a page
> fault in _pci_hide_device.

Oh, right, that's also using the pre-constructed page tables iirc.
When I say "EFI boot" most of the time it would mean "native"
EFI mode, not that with another boot loader in the middle. But
yes, I can see how my earlier reply was imprecise / ambiguous.

Jan



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