Re: [PATCH 6.18 0019/1611] iommu/amd: Use maximum PPR log buffer size when SNP is enabled on Family 0x19

On 15/08/2026 03:33, Sasha Levin wrote:
>> I have raised this in [1] but also raising it here, this series seems to break
>> kexec on Milan hosts.
>>
>> kexec starts working on SNP hosts once we do:
>> Revert "iommu/amd: Use maximum PPR log buffer size when SNP is enabled on Family 0x19"
>> Revert "iommu/amd: Use maximum Event log buffer size when SNP is enabled on Family 0x19"
>>
>> on top 6.18.43 release.
> 
> Does the kexec hang also reproduce on v7.1.y, or on mainline? That would tell
> us whether this is the code itself rather than anything specific to the 6.18
> backport, and it decides whether a stable-side revert is the right remedy at
> all.
> 

I tested on mainline, thats broken as well.

We are deploying 6.18 in the fleet and we caught it that way.