On 7/22/2025 3:23 AM, Ashish Kalra wrote:
From: Ashish Kalra <ashish.kalra@xxxxxxx> 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 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. Signed-off-by: Ashish Kalra <ashish.kalra@xxxxxxx>
Tested-by: Sairaj Kodilkar <sarunkod@xxxxxxx>
