12 Nov
2023
12 Nov
'23
6:45 p.m.
On Fri, Nov 10, 2023 at 09:05:19AM -0800, Adam Dunlap wrote:
commit f79936545fb122856bd78b189d3c7ee59928c751 upstream.
This patch fixes a boot failure that happens with VMs running with SEV-ES or SEV-SNP when the guest kernel is compiled with a gcc version past 12.3 (or possibly earlier) due to undefined behavior. As far as I know, the UB has existed ever since SEV-ES guest support was merged in (I believe 5.9), but only started causing boot failures with the updated compiler. Thus, I propose backporting this patch to stable branches since 5.9.
Looks like its already queued for 5.15+, and needed some minor massaging to get to 5.10.
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Thanks,
Sasha