Re: [PATCH v5 00/75] x86: SEV-ES Guest Support
Hi Mike, On Fri, Aug 21, 2020 at 05:42:16PM +, Mike Stunes wrote: > Yes, that fixes the problem — I can see both CPUs running now. Thanks! Thanks a lot for testing, good to have this issue resolved. Regards, Joerg ___ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization
Re: [PATCH v5 00/75] x86: SEV-ES Guest Support
Hi Mike, On Thu, Aug 20, 2020 at 12:58:13AM +, Mike Stunes wrote: > Yes, I still see the issue — APs are offline after boot. I’ll spend > some time seeing if I can figure out what the problem is. Thanks! Tom and a few others debugged another FSGSBASE issue yesterday, which I think might also be the cause for the AP startup problems you are seeing (if you test on Rome). Can you try to disable support for RDPID in the guest, but keep fsgsbase enabled? Thanks, Joerg ___ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization
Re: [PATCH v5 00/75] x86: SEV-ES Guest Support
Hi Mike, On Thu, Aug 20, 2020 at 12:58:13AM +, Mike Stunes wrote: > Yes, I still see the issue — APs are offline after boot. I’ll spend > some time seeing if I can figure out what the problem is. Thanks! Thanks. I think the first step here would be to find out where on the APs (which RIP) the first #VC exception happens. I guess in the #VC entry code it triggers the next exception when trying to execute the fsgsbase instructions. Regards, Joerg ___ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization
Re: [PATCH v5 00/75] x86: SEV-ES Guest Support
Hi Mike, On Thu, Jul 30, 2020 at 11:23:50PM +, Mike Stunes wrote: > Yes, FSGSBASE was enabled. If I disable it*, this kernel boots fine, with > both CPUs online. > > *That is, by forcing guest-CPUID[7].EBX bit 0 to 0. Can you please test whether https://git.kernel.org/pub/scm/linux/kernel/git/joro/linux.git/log/?h=sev-es-client-tip-5.9 still triggers this issue on your side? Thanks, Joerg ___ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization
Re: [PATCH v5 00/75] x86: SEV-ES Guest Support
Hi Mike,
On Thu, Jul 30, 2020 at 01:27:48AM +, Mike Stunes wrote:
> Thanks for the updated patches! I applied this patch-set onto commit
> 01634f2bd42e ("Merge branch 'x86/urgent’”) from your tree. It boots,
> but CPU 1 (on a two-CPU VM) is offline at boot, and `chcpu -e 1` returns:
>
> chcpu: CPU 1 enable failed: Input/output error
>
> with nothing in dmesg to indicate why it failed. The first thing I thought
> of was anything relating to the AP jump table, but I haven’t changed
> anything there on the hypervisor side. Let me know what other data I can
> provide for you.
Hard to tell, have you enabled FSGSBASE in the guest? If yes, can you
try to disable it?
Regards,
Joerg
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