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[0/4] selftests/vm/pkeys: Bug fixes and a new test

Message ID 20210611164153.91B76FB8@viggo.jf.intel.com (mailing list archive)
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Series selftests/vm/pkeys: Bug fixes and a new test | expand

Message

Dave Hansen June 11, 2021, 4:41 p.m. UTC 
There has been a lot of activity on the x86 front around the XSAVE
architecture which is used to context-switch processor state (among
other things).  In addition, AMD has recently joined the protection
keys club by adding processor support for PKU.

The AMD implementation helped uncover a kernel bug around the PKRU
"init state", which actually applied to Intel's implementation but
was just harder to hit.  This series adds a test which is expected
to help find this class of bug both on AMD and Intel.  All the work
around pkeys on x86 also uncovered a few bugs in the selftest.

Any testing of this new code (especially from my powerpc friends)
would be appreciated.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ram Pai <linuxram@us.ibm.com>
Cc: Sandipan Das <sandipan@linux.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Florian Weimer <fweimer@redhat.com>
Cc: "Desnes A. Nunes do Rosario" <desnesn@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Michal Suchanek <msuchanek@suse.de>
Cc: Shuah Khan <shuah@kernel.org>
Cc: x86@kernel.org

Comments

Aneesh Kumar K.V June 13, 2021, 8:54 a.m. UTC | #1 
Dave Hansen <dave.hansen@linux.intel.com> writes:

> There has been a lot of activity on the x86 front around the XSAVE
> architecture which is used to context-switch processor state (among
> other things).  In addition, AMD has recently joined the protection
> keys club by adding processor support for PKU.
>
> The AMD implementation helped uncover a kernel bug around the PKRU
> "init state", which actually applied to Intel's implementation but
> was just harder to hit.  This series adds a test which is expected
> to help find this class of bug both on AMD and Intel.  All the work
> around pkeys on x86 also uncovered a few bugs in the selftest.
>
> Any testing of this new code (especially from my powerpc friends)
> would be appreciated.

I tested this on ppc64.

Tested-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>

>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: Ram Pai <linuxram@us.ibm.com>
> Cc: Sandipan Das <sandipan@linux.ibm.com>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Florian Weimer <fweimer@redhat.com>
> Cc: "Desnes A. Nunes do Rosario" <desnesn@linux.vnet.ibm.com>
> Cc: Ingo Molnar <mingo@kernel.org>
> Cc: Thiago Jung Bauermann <bauerman@linux.ibm.com>
> Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
> Cc: Michael Ellerman <mpe@ellerman.id.au>
> Cc: Michal Hocko <mhocko@kernel.org>
> Cc: Michal Suchanek <msuchanek@suse.de>
> Cc: Shuah Khan <shuah@kernel.org>
> Cc: x86@kernel.org