iommu/vt-d: Fix UCTP context table slot when copying root entries

When translation is already enabled at boot (e.g. kdump), the vt-d driver
copies context tables from the previous kernel's root table. In scalable
mode, buses that only populate the upper root half (UCTP, devfn >= 0x80)
should be written to ctxt_tbls[tbl_idx + 1] through copy_context_table().
However, the current copy path always uses tbl[tbl_idx + 0] in this situa-
tion. Since idx wraps to 0 at devfn 0x80 due to a zeroed LCTP, new_ce for
LCTP will be NULL and keep pos equals to 0. Thus, UCTP entries will be co-
pied into tbl[tbl_idx + 0] instead of tbl[tbl_idx + 1], and written after-
wards to root_entry[bus].lo instead of .hi in copy_translation_tables().

In short, devices on bus 0x80 with devfn >= 0x80 fail DMA with fault 0x39,
which will break drivers running in kernels with translation pre-enabled.
This fixes NO_PASID DMAR faults for UCTP-only buses such as:

DMAR: [DMA Read NO_PASID] Request device [80:14.0] fault addr 0xe81759000
      [fault reason 0x39] SM: Present bit in Root Entry is clear

For instance, this fault yielded to locking issues between systemd and
xHCI, blocking a system's reboot after a vmcore was captured with kdump:

 systemd-udevd[246]: usb3: Worker [255] processing SEQNUM=2193 is taking a long time
 dracut-initqueue[277]: Timed out while waiting for udev queue to empty.
 systemd-udevd[246]: usb3: Worker [255] processing SEQNUM=2193 killed
 systemd-udevd[246]: usb3: Worker [255] terminated by signal 9 (KILL).
 ...
 kdump[569]: saving vmcore complete
 ...
 systemd-shutdown[1]: Rebooting.
 INFO: task kworker/0:1:11 blocked for more than 122 seconds.
       Not tainted 7.0.0-clean #1
 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
 task:kworker/0:1 state:D stack:0 pid:11 tgid:11 ppid:2 task_flags:0x4208160 flags:0x00080000
 Workqueue: usb_hub_wq hub_event
 Call Trace:
  <TASK>
  __schedule+0x299/0x5c0
  schedule+0x27/0x80
  schedule_timeout+0xbd/0x100
  __wait_for_common+0x97/0x1b0
  ? __pfx_schedule_timeout+0x10/0x10
  xhci_alloc_dev+0x9e/0x2b0
  usb_alloc_dev+0x7a/0x3b0
  hub_port_connect+0x285/0x960
  hub_port_connect_change+0x94/0x290
  port_event+0x4bb/0x840
  hub_event+0x141/0x460
  process_one_work+0x196/0x390
  worker_thread+0x1af/0x320
  ? __pfx_worker_thread+0x10/0x10
  kthread+0xe3/0x120
  ? __pfx_kthread+0x10/0x10
  ret_from_fork+0x199/0x260
  ? __pfx_kthread+0x10/0x10
  ret_from_fork_asm+0x1a/0x30
  </TASK>
 INFO: task systemd-shutdow:1 blocked for more than 122 seconds.
       Not tainted 7.0.0-clean #1
 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
 task:systemd-shutdow state:D stack:0 pid:1 tgid:1 ppid:0 task_flags:0x400100 flags:0x00080000
 Call Trace:
  <TASK>
  __schedule+0x299/0x5c0
  schedule+0x27/0x80
  schedule_preempt_disabled+0x15/0x30
  __mutex_lock.constprop.0+0x547/0xac0
  device_shutdown+0xac/0x1b0
  kernel_restart+0x3a/0x70
  __do_sys_reboot+0x147/0x240
  do_syscall_64+0x11b/0x6a0
  ? handle_mm_fault+0x110/0x350
  ? do_user_addr_fault+0x206/0x680
  ? irqentry_exit+0x7a/0x4d0
  entry_SYSCALL_64_after_hwframe+0x76/0x7e
 RIP: 0033:0x7fe2958da917
 RSP: 002b:00007ffc5c458618 EFLAGS: 00000206 ORIG_RAX: 00000000000000a9
 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fe2958da917
 RDX: 0000000001234567 RSI: 0000000028121969 RDI: 00000000fee1dead
 RBP: 00007ffc5c458790 R08: 0000000000000069 R09: 00000000ffffffff
 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
 R13: 0000000000000000 R14: 00007ffc5c4588b8 R15: 0000000000000000
  </TASK>
 INFO: task systemd-shutdow:1 is blocked on a mutex likely owned by task kworker/0:1:11.

Fixes: 091d42e43d21 ("iommu/vt-d: Copy translation tables from old kernel")
Signed-off-by: Desnes Nunes <desnesn@redhat.com>
Tested-by: Tao Liu <ltao@redhat.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Samiullah Khawaja <skhawaja@google.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

0 files changed, 0 insertions, 0 deletions