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After a panic if SNP is enabled in the previous kernel then the kdump kernel boots with IOMMU SNP enforcement still enabled. IOMMU device table register is locked and exclusive to the previous kernel. Attempts to copy old device table from the previous kernel fails in kdump kernel as hardware ignores writes to the locked device table base address register as per AMD IOMMU spec Section 2.12.2.1. This causes the IOMMU driver (OS) and the hardware to reference different memory locations. As a result, the IOMMU hardware cannot process the command which results in repeated "Completion-Wait loop timed out" errors and a second kernel panic: "Kernel panic - not syncing: timer doesn't work through Interrupt-remapped IO-APIC". Reuse device table instead of copying device table in case of kdump boot and remove all copying device table code. Reviewed-by: Vasant Hegde <vasant.hegde@amd.com> Tested-by: Sairaj Kodilkar <sarunkod@amd.com> Signed-off-by: Ashish Kalra <ashish.kalra@amd.com> Link: https://lore.kernel.org/r/3a31036fb2f7323e6b1a1a1921ac777e9f7bdddc.1756157913.git.ashish.kalra@amd.com Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.