Hi, We got the following report in Debian after an update from 5.10.140 to the current 5.10.149. Full quoting below (from https://bugs.debian.org/1022126). Does this ring some bell about known regressions? On Thu, Oct 20, 2022 at 05:21:03PM +0200, Adi Kriegisch wrote: > Package: linux-image-5.10.0-19-amd64 > Version: 5.10.149-1 > Severity: important > > Dear maintainers, > > with the upgrade to the latest bullseye kernel (5.10.149-1), our xen setup > is unbootable due to swiotlb buffer errors: > | sd 0:0:0:0: scsi_dma_map failed: request for 401408 bytes! > and > | mpt3sas 0000:01:00.0: swiotlb buffer is full (sz: 401408 bytes), > | total 32768 (slots), used 0 (slots) > (the byte sizes vary between boots). > > After reading bug #850425[1], we also tried to force 32bit mode in the > mpt3sas driver by specifying a dom0 memory below 4G; this lets the machine > boot, but almost immediately after that fails with the same error. Notable > difference is that the used slots are 128. > > Xen commandline: > dom0_mem=4096M,max:4096M dom0_max_vcpus=4 dom0_vcpus_pin > ucode=scan xpti=dom0=false,domu=true gnttab_max_frames=128 > > Using dom0-iommu=map-inclusive in some combinations with swiotlb on the > kernel commandline gives us some used slots (way below 128) in the error > message even in 64bit dma mode in the mpt3sas driver. > > The kernel works when booted without xen. We'd be more than happy to get > pointers on how to fix that issue or patches to test! > > Thanks for your help! > > -- Adi > > [1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=850425 Regards, Salvatore
