On 07.06.23 15:12, Christoph Hellwig wrote:
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?
As long as above mentioned check of the E820 map is done, yes. If you want I can send a diff to be folded into your patch on Monday.
(I'd still like to merge swiotlb-xen into swiotlb eventually, but it's probably not going to happen this merge window)
Would be nice. Juergen
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