linux-sgx.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
* Re: Linux FSGSBASE testing
       [not found] <CALCETrU_O4AxcJeBO77uXt2j8woYVtjZd18-YV0BuCKRAu00eA@mail.gmail.com>
@ 2020-07-18 20:18 ` Don Porter
  0 siblings, 0 replies; only message in thread
From: Don Porter @ 2020-07-18 20:18 UTC (permalink / raw)
  To: Andy Lutomirski, LKML, X86 ML, Stas Sergeev, linux-sgx

On 6/20/20 11:59 AM, Andy Lutomirski wrote:
> Hi Stas-
> 
> FSGSBASE support is queued up for Linux 5.9.  Since you're one of the
> more exotic users of segmentation on Linux, is there any chance you
> could test it?  The code is here:
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git/log/?h=x86/fsgsbase
> 
> There are two interesting cases to test:
> 
> 1. FSGSBASE on.  This is the default if you boot this kernel on Ivy
> Bridge or newer hardware.
> 
> 2. FSGSBASE off on a patched kernel.  Boot the same kernel as in #1
> but either pass nofsgsbase on the kernel command line or use pre-Ivy
> Bridge hardware.  You will *
> 
> You can tell you have FSGSBASE enabled for test #1 by running
> tools/testing/selftests/x86/fsgsbase_64 -- the first line of output
> will be :FSGSBASE instructions are enabled".  You can build it by
> cd-ing to tools/testing/selftests/x86 and running make.
> 
> If anything is broken for you, I'd like to know before this makes it
> into a released kernel!
> 
> Thanks,
> Andy
> 

FWIW, we tested this patch using Graphene under Case 1, both in our 
standard CI pipelines, and with hand testing.  Everything looks good on 
our end - no suspicious dmesg, no application-level issues.

I also reran the stress test Andy suggested on a separate thread, which 
also looks good:
* Graphene running nginx pinned to core 0
* infinite loop on core 0
* perf top running
* Exercised with non-SGX apache bench several times (~10 minutes of 
testing time) also from core 0

All the best,
Don

^ permalink raw reply	[flat|nested] only message in thread

only message in thread, other threads:[~2020-07-18 20:18 UTC | newest]

Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
     [not found] <CALCETrU_O4AxcJeBO77uXt2j8woYVtjZd18-YV0BuCKRAu00eA@mail.gmail.com>
2020-07-18 20:18 ` Linux FSGSBASE testing Don Porter

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).