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iommu/vt-d: debugfs: Fix legacy mode page table dump logic

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[ Upstream commit fbe6070c73 ]

In legacy mode, SSPTPTR is ignored if TT is not 00b or 01b. SSPTPTR
maybe uninitialized or zero in that case and may cause oops like:

 Oops: general protection fault, probably for non-canonical address
       0xf00087d3f000f000: 0000 [#1] SMP NOPTI
 CPU: 2 UID: 0 PID: 786 Comm: cat Not tainted 6.16.0 #191 PREEMPT(voluntary)
 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.17.0-5.fc42 04/01/2014
 RIP: 0010:pgtable_walk_level+0x98/0x150
 RSP: 0018:ffffc90000f279c0 EFLAGS: 00010206
 RAX: 0000000040000000 RBX: ffffc90000f27ab0 RCX: 000000000000001e
 RDX: 0000000000000003 RSI: f00087d3f000f000 RDI: f00087d3f0010000
 RBP: ffffc90000f27a00 R08: ffffc90000f27a98 R09: 0000000000000002
 R10: 0000000000000000 R11: 0000000000000000 R12: f00087d3f000f000
 R13: 0000000000000000 R14: 0000000040000000 R15: ffffc90000f27a98
 FS:  0000764566dcb740(0000) GS:ffff8881f812c000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: 0000764566d44000 CR3: 0000000109d81003 CR4: 0000000000772ef0
 PKRU: 55555554
 Call Trace:
  <TASK>
  pgtable_walk_level+0x88/0x150
  domain_translation_struct_show.isra.0+0x2d9/0x300
  dev_domain_translation_struct_show+0x20/0x40
  seq_read_iter+0x12d/0x490
...

Avoid walking the page table if TT is not 00b or 01b.

Fixes: 2b437e8045 ("iommu/vt-d: debugfs: Support dumping a specified page table")
Signed-off-by: Vineeth Pillai (Google) <vineeth@bitbyteword.org>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/20250814163153.634680-1-vineeth@bitbyteword.org
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Vineeth Pillai (Google) 2025-09-18 13:01:59 +08:00 • committed by Greg Kroah-Hartman
commit df2bf759a0
1 changed files with 15 additions and 2 deletions
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