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 command buffers and event buffer registers remain locked and exclusive to the previous kernel. Attempts to enable command and event buffers in the kdump kernel will fail, as hardware ignores writes to the locked MMIO registers as per AMD IOMMU spec Section 2.12.2.1. Skip enabling command buffers and event buffers for kdump boot as they are already enabled in the previous kernel. Signed-off-by: Ashish Kalra <ashish.kalra@xxxxxxx>
Tested-by: Sairaj Kodilkar <sarunkod@xxxxxxx>
