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* dmar pte read access not set error messages on hp dl388 gen8 systems
@ 2019-12-02  6:34 Jerry Snitselaar
  2019-12-02  6:41 ` Lu Baolu
  0 siblings, 1 reply; 30+ messages in thread
From: Jerry Snitselaar @ 2019-12-02  6:34 UTC (permalink / raw)
  To: iommu, Joerg Roedel, Lu Baolu

We are seeing DMAR PTE read access not set errors when booting a
kernel with default passthrough, both with a test kernel and with
a 5.4.0 kernel. Previously we would see a number of identity mappings
being set related to the rmrrs, and now they aren't seen and we get
the dmar pte errors as devices touch those regions. From what I can tell
currently df4f3c603aeb ("iommu/vt-d: Remove static identity map code")
removed the bit of code in init_dmars that used to set up those
mappings:

-       /*
-        * For each rmrr
-        *   for each dev attached to rmrr
-        *   do
-        *     locate drhd for dev, alloc domain for dev
-        *     allocate free domain
-        *     allocate page table entries for rmrr
-        *     if context not allocated for bus
-        *           allocate and init context
-        *           set present in root table for this bus
-        *     init context with domain, translation etc
-        *    endfor
-        * endfor
-        */
-       pr_info("Setting RMRR:\n");
-       for_each_rmrr_units(rmrr) {
-               /* some BIOS lists non-exist devices in DMAR table. */
-               for_each_active_dev_scope(rmrr->devices, rmrr->devices_cnt,
-                                         i, dev) {
-                       ret = iommu_prepare_rmrr_dev(rmrr, dev);
-                       if (ret)
-                               pr_err("Mapping reserved region failed\n");
-               }
-       }

si_domain_init now has code that sets identity maps for devices in rmrrs, but
only for certain devices.

With iommu=nopt, the system boots up without issue.

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^ permalink raw reply	[flat|nested] 30+ messages in thread

end of thread, other threads:[~2019-12-10 22:12 UTC | newest]

Thread overview: 30+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-12-02  6:34 dmar pte read access not set error messages on hp dl388 gen8 systems Jerry Snitselaar
2019-12-02  6:41 ` Lu Baolu
2019-12-02  7:14   ` Jerry Snitselaar
2019-12-02 16:13     ` Jerry Snitselaar
2019-12-03  1:59       ` Lu Baolu
2019-12-03  9:56         ` Jerry Snitselaar
2019-12-04  0:17           ` Lu Baolu
2019-12-04 20:53             ` Jerry Snitselaar
2019-12-05  1:39               ` Lu Baolu
2019-12-05  2:25                 ` Jerry Snitselaar
2019-12-05  2:44                   ` Lu Baolu
2019-12-05  2:53                     ` Jerry Snitselaar
2019-12-06  1:52                       ` Lu Baolu
2019-12-06  7:24                         ` Jerry Snitselaar
2019-12-07  1:53                           ` Lu Baolu
2019-12-07  2:29                             ` Jerry Snitselaar
2019-12-07  2:41                               ` Jerry Snitselaar
2019-12-08  6:26                                 ` Lu Baolu
2019-12-10  0:52                                   ` Jerry Snitselaar
2019-12-10  1:29                                     ` Lu Baolu
2019-12-10  3:47                                       ` Jerry Snitselaar
2019-12-10  5:03                                         ` Lu Baolu
2019-12-10  5:18                                         ` Jerry Snitselaar
2019-12-10  5:43                                           ` Lu Baolu
2019-12-10 22:12                                             ` Jerry Snitselaar
2019-12-10  5:43                                           ` Jerry Snitselaar
2019-12-10  6:16                                             ` Jerry Snitselaar
2019-12-10  6:26                                               ` Lu Baolu
2019-12-10  7:44                                                 ` Jerry Snitselaar
2019-12-08  6:04                           ` Lu Baolu

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