| commit | 05d227efbd8d3ce28c3a87b66b5794235be197f4 | [log] [tgz] |
|---|---|---|
| author | Tom Lendacky <thomas.lendacky@amd.com> | Tue Jan 17 04:40:38 2023 +0000 |
| committer | Joerg Roedel <jroedel@suse.de> | Fri Jan 20 10:41:57 2023 +0100 |
| tree | 0f3677b10f52bac4763058a74e8bda2c18c4f4fa | |
| parent | 080920e52148b4fbbf9360d5345fdcd7846e4841 [diff] |
iommu/amd: Do not clear event/ppr log buffer when snp is enabled Current code clears event log and ppr log entry after processing it due to hardware errata ([1] erratum #732, #733). We do not have hardware issue on SNP enabled system. When SNP is enabled, the event logs, PPR log and completion wait buffer are read-only to the host (see SNP FW ABI spec [2]). Clearing those entry will result in a kernel #PF for an RMP violation. Hence do not clear event and ppr log entry after processing it. [1] http://developer.amd.com/wordpress/media/2012/10/48931_15h_Mod_10h-1Fh_Rev_Guide.pdf [2] https://www.amd.com/system/files/TechDocs/56860.pdf Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Signed-off-by: Vasant Hegde <vasant.hegde@amd.com> Reviewed-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> Link: https://lore.kernel.org/r/20230117044038.5728-1-vasant.hegde@amd.com Signed-off-by: Joerg Roedel <jroedel@suse.de>