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
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