On Wed, Jan 31, 2024 at 10:30 AM Borislav Petkov [off-list ref] wrote:

On Wed, Jan 31, 2024 at 10:16:55AM -0800, Jacob Xu wrote:

quoted

We're interested in fixing SEV-SNP guest boots which are currently
broken when using a guest kernel compiled with clang. It seems like
every other user of SEV/SNP linux kernel code uses GCC to compile the
kernel so they've avoided this issue.

Lemme give that a try here.

quoted

E.g. Google COS uses clang to compile the kernel and we've made do
with an internal fix for a while.

Which means that, theoretically, you could forward-port this internal
fix until the issue is fixed for real, I'd say.

True. I just think it would be better to have an upstream fix for
clang builds of SEV-SNP guests; I believe the first such SEV-SNP code
was merged in 5.19 if I'm not mistaken.