On Fri, Oct 8, 2021 at 11:18 PM Jean-Philippe Brucker <jean-phili...@linaro.org> wrote: > > On Tue, Oct 05, 2021 at 11:45:42AM -0400, Michael S. Tsirkin wrote: > > Looks like this can not be applied yet because the bypass bit > > isn't in yet. what's up with that? > > The boot-bypass bit isn't a hard dependency for this series, but it will > be needed for full support eventually. It will be delayed by spec and > Linux header changes > > In the meantime we can work around the problem by having the boot disks > bypass the IOMMU (virtio without iommu-platform, or iommu-bypass bus).
Hi Jean, I have tested on x86 platform with environment: qemu, your personal repo: http://jpbrucker.net/git/qemu, branch: virtio-iommu/acpi-2021-10-01 linux kernel, 5.14 qemu command, with '-device virtio-iommu' and boot disk 'virtio-blk-pci,iommu_platform=off' But the guest boot failed. The print is as follows: Begin: Loading essential drivers ... done. Begin: Running /scripts/init-premount ... done. Begin: Mounting root file system ... Begin: Running /scripts/local-top ... done. Begin: Running /scripts/local-premount ... [ 7.490238] Btrfs loaded, crc32c=crc32c-generic, zoned=no Scanning for Btrfs filesystems done. [ 10.593238] _warn_unseeded_randomness: 300 callbacks suppressed [ 10.593243] random: get_random_u32 called from bucket_table_alloc.isra.0+0x123/0x430 with crng_init=0 [ 37.534015] random: get_random_u64 called from dup_task_struct+0x415/0xa10 with crng_init=0 [ 37.539950] random: get_random_u64 called from arch_pick_mmap_layout+0x411/0x5e0 with crng_init=0 [ 37.539973] random: get_random_u64 called from arch_pick_mmap_layout+0x381/0x5e0 with crng_init=0 Begin: Waiting for root file system ... [ 38.624374] _warn_unseeded_randomness: 38 callbacks suppressed [ 38.624389] random: get_random_u64 called from dup_task_struct+0x415/0xa10 with crng_init=0 Begin: Running /scripts/local-block ... [ 38.630760] random: get_random_u64 called from arch_pick_mmap_layout+0x410 [ 38.630767] random: get_random_u64 called from arch_pick_mmap_layout+0x381/0x5e0 with crng_init=0 mdadm: No arrays found in config file or automatically done. mdadm: No arrays found in config file or automatically mdadm: No arrays found in config file or automatically mdadm: No arrays found in config file or automatically mdadm: No arrays found in config file or automatically mdadm: No arrays found in config file or automatically mdadm: No arrays found in config file or automatically mdadm: No arrays found in config file or automatically mdadm: No arrays found in config file or automatically mdadm: No arrays found in config file or automatically mdadm: No arrays found in config file or automatically mdadm: No arrays found in config file or automatically mdadm: No arrays found in config file or automatically mdadm: No arrays found in config file or automatically mdadm: No arrays found in config file or automatically mdadm: No arrays found in config file or automatically mdadm: No arrays found in config file or automatically mdadm: No arrays found in config file or automatically mdadm: No arrays found in config file or automatically mdadm: No arrays found in config file or automatically [ 39.633914] _warn_unseeded_randomness: 1278 callbacks suppressed [ 39.633918] random: get_random_u64 called from dup_task_struct+0x415/0xa10 with crng_init=0 [ 39.634867] random: get_random_u64 called from arch_pick_mmap_layout+0x411/0x5e0 with crng_init=0 [ 39.634875] random: get_random_u64 called from arch_pick_mmap_layout+0x381/0x5e0 with crng_init=0 mdadm: error opening /dev/md?*: No such file or directory mdadm: No arrays found in config file or automatically mdadm: No arrays found in config file or automatically mdadm: No arrays found in config file or automatically mdadm: No arrays found in config file or automatically mdadm: No arrays found in config file or automatically mdadm: No arrays found in config file or automatically mdadm: No arrays found in config file or automatically mdadm: No arrays found in config file or automatically mdadm: No arrays found in config file or automatically mdadm: No arrays found in config file or automatically mdadm: No arrays found in config file or automatically done. Gave up waiting for root file system device. Common problems: - Boot args (cat /proc/cmdline) - Check rootdelay= (did the system wait long enough?) - Missing modules (cat /proc/modules; ls /dev) ALERT! UUID=3caf26b5-4d08-43e0-8634-7573269c4f70 does not exist. Dropping to a shell! Any suggestions? Thanks. -- Haiwei
