On Mon, May 22, 2023 at 10:37:09AM +0200, Juergen Gross wrote:
In normal cases PCI passthrough in PV guests requires to start the guest
with e820_host=1. So it should be rather easy to limit allocating the
64MB in PV guests to the cases where the memory map has non-RAM regions
especially in the first 1MB of the memory.
This will cover even hotplug cases. The only case not covered would be a
guest started with e820_host=1 even if no PCI passthrough was planned.
But this should be rather rare (at least I hope so).
So is this an ACK for the patch and can we go ahead with it?
(I'd still like to merge swiotlb-xen into swiotlb eventually, but it's
probably not going to happen this merge window)
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