Hi Jon, Thank you for raising this bug.
While we are going to investigate this (I've launched some VMs and I can confirm / reproduce the behavior), I would like to ask why do you think the missing CPU flags is relevant here? It was mentioned missing the following flags when SEV-SNP is enabled: AVX AVX2 VAES VPCLMULQDQ FMA XSAVE XSAVEOPT XSAVEC XGETBV1 RDPRU However, those same flags are also missing when we launch a AL2023 instance with SEV-SNP enabled, so I would assume that is expected, no? The biggest difference I saw when comparing Ubuntu 24.04 with and without SEV-SNP and AL2023, is that the invpcid_single is missing on Ubuntu both when SEV-SNP is enabled or disabled, but I'm not sure if this has any relevance here. Please, let us know your thoughts. Regards, Fabio Martins -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2095017 Title: SEV-SNP Causes Significant RSA Performance Degradation on Ubuntu 24.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-aws/+bug/2095017/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
