On Tue, 27 Jun 2023 17:48:02 +0200 Christoph Hellwig <hch@xxxxxx> wrote: > On Tue, Jun 27, 2023 at 01:30:06PM +0200, Petr Tesařík wrote: > > Xen is the only user of an "is SWIOTLB present" interface. IIUC Xen > > needs bounce buffers for the PCI frontend driver, but if there is no > > other reason to have a SWIOTLB, the system does not set up one at boot. > > Please take a look at my "unexport swiotlb_active v2" series that > unfortunately missed the 6.5 merge window waiting for reviews. I noticed it, but it seems I missed the part which completely removes pci_xen_swiotlb_init_late(). Then we're left only with a reference from xen_mm_init() in arch/arm/xen/mm.c, and I believe this one can also be solved differently. Petr T
