** Description changed: See https://canonical.lightning.force.com/lightning/r/Case/5004K000009WBzrQAG/view for more info [Impact] Using nvme with swiotlb in confidential VMs can encounter hardware read/write errors. [Fix] - The following upstream patches address this: + The following upstream patches from v5.12 address this: 3d2d861eb03e nvme-pci: set min_align_mask 1f221a0d0dbf swiotlb: respect min_align_mask 16fc3cef33a0 swiotlb: don't modify orig_addr in swiotlb_tbl_sync_single 26a7e094783d swiotlb: refactor swiotlb_tbl_map_single ca10d0f8e530 swiotlb: clean up swiotlb_tbl_unmap_single c32a77fd1878 swiotlb: factor out a nr_slots helper c7fbeca757fe swiotlb: factor out an io_tlb_offset helper b5d7ccb7aac3 swiotlb: add a IO_TLB_SIZE define [Test] Using a confidential VM, with 'swiotlb=force' set on the kernel command line, and an additional nvme device attached: $ sudo mkfs.xfs -f /dev/nvme2n1 meta-data=/dev/nvme2n1 isize=512 agcount=4, agsize=131072 blks = sectsz=512 attr=2, projid32bit=1 = crc=1 finobt=1, sparse=0, rmapbt=0, refl ink=0 data = bsize=4096 blocks=524288, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 ftype=1 log =internal log bsize=4096 blocks=2560, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 mkfs.xfs: pwrite failed: Input/output error Note the input/output error The error no longer happens with the fixes applied. [Regression Potential] Low risk as the patches are mostly clean-up and refactor. Regression in swiotlb could cause hardware read/write errors
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1943902 Title: NVME errors in confidential vms To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-gcp/+bug/1943902/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
