Messages in this thread | | | Date | Tue, 12 May 2020 23:13:18 +0200 | From | Joerg Roedel <> | Subject | Re: Failure to shutdown/reboot with intel_iommu=on |
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Hi Lenny,
On Tue, May 12, 2020 at 04:00:26PM -0400, Lenny Szubowicz wrote: > Some Lenovo laptops provide an ACPI DMAR RMRR that identifies the memory > range that the kernel should open up for permissable DMA access > for this purpose. Unfortunately, the PCI device that performs these > DMA operations is hidden from the kernel by the BIOS. Given that the > associated PCI device is hidden, the Linux kernel does not act upon > the associated DMAR RMRR.
That sounds aweful. We should add to the VT-d driver that it sets up RMRR mappings for request-ids which are not present as a PCI device, to fix the Laptops which have it.
For the others, is the region the TPM talks to via DMA known so that we can add a quirk?
Joerg
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