On Tue Dec 03 19, Lu Baolu wrote:
Hi,
On 12/3/19 12:13 AM, Jerry Snitselaar wrote:
On Mon Dec 02 19, Jerry Snitselaar wrote:
On Mon Dec 02 19, Lu Baolu wrote:
Hi,
On 12/2/19 2:34 PM, Jerry Snitselaar wrote:
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.
On which device, are you seeing this error? Is it a rmrr locked device?
Best regards,
baolu
Almost all of the messages are for the ilo, but there also is a
message for
the smart array raid bus controller.
Also seeing it with a dl380 gen9 system, where the raid bus controller
is getting the error.
Does it help if you remove
if (device_is_rmrr_locked(dev))
continue;
in si_domain_init()?
Unfortunately it still spits out a bunch of error messages.
Best regards,
baolu
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
