On 3/4/22 12:43 PM, Christoph Hellwig wrote:
On Fri, Mar 04, 2022 at 12:36:17PM -0500, Boris Ostrovsky wrote:
I bisected it to "x86: remove the IOMMU table infrastructure" but haven't actually looked at the code yet.
That looks like the swiotlb buffer did not get initialized at all, but I
can't really explain why.
Can you stick in a printk and see if xen_swiotlb_init_early gets called
at all?
Actually, that's the only thing I did do so far and yes, it does get called.
So, specifically for "x86: remove the IOMMU table infrastructure" I
think we need the one-liner below so that swiotlb_exit doesn't get called
for the Xen case. But that should have been fixed up by the next
patch already.
This indeed allows dom0 to boot. Not sure I see where in the next patch this would have been fixed?
(BTW, just noticed in iommu_setup() you set this variable to 1. Should be 'true')
-boris
