Re: [PATCH v7 20/26] x86/cpufeature: Add User-Mode Instruction Prevention definitions

On Sat, 2017-05-06 at 11:04 +0200, Paolo Bonzini wrote:
> 
> 
> On 05/05/2017 20:17, Ricardo Neri wrote:
> > User-Mode Instruction Prevention is a security feature present in
> new
> > Intel processors that, when set, prevents the execution of a subset
> of
> > instructions if such instructions are executed in user mode (CPL >
> 0).
> > Attempting to execute such instructions causes a general protection
> > exception.
> > 
> > The subset of instructions comprises:
> > 
> >  * SGDT - Store Global Descriptor Table
> >  * SIDT - Store Interrupt Descriptor Table
> >  * SLDT - Store Local Descriptor Table
> >  * SMSW - Store Machine Status Word
> >  * STR  - Store Task Register
> > 
> > This feature is also added to the list of disabled-features to allow
> > a cleaner handling of build-time configuration.
> > 
> > Cc: Andy Lutomirski <[email protected]>
> > Cc: Andrew Morton <[email protected]>
> > Cc: H. Peter Anvin <[email protected]>
> > Cc: Borislav Petkov <[email protected]>
> > Cc: Brian Gerst <[email protected]>
> > Cc: Chen Yucong <[email protected]>
> > Cc: Chris Metcalf <[email protected]>
> > Cc: Dave Hansen <[email protected]>
> > Cc: Fenghua Yu <[email protected]>
> > Cc: Huang Rui <[email protected]>
> > Cc: Jiri Slaby <[email protected]>
> > Cc: Jonathan Corbet <[email protected]>
> > Cc: Michael S. Tsirkin <[email protected]>
> > Cc: Paul Gortmaker <[email protected]>
> > Cc: Peter Zijlstra <[email protected]>
> > Cc: Ravi V. Shankar <[email protected]>
> > Cc: Shuah Khan <[email protected]>
> > Cc: Vlastimil Babka <[email protected]>
> > Cc: Tony Luck <[email protected]>
> > Cc: Paolo Bonzini <[email protected]>
> > Cc: Liang Z. Li <[email protected]>
> > Cc: Alexandre Julliard <[email protected]>
> > Cc: Stas Sergeev <[email protected]>
> > Cc: [email protected]
> > Cc: [email protected]
> > 
> > Signed-off-by: Ricardo Neri <[email protected]>
> 
> Would it be possible to have this patch in a topic branch for KVM's
> consumption?
> 
I have put a branch here with this single patch:

https://github.com/ricardon/tip.git rneri/umip_for_kvm

This is based on Linux v4.11. Please let me know if this works for your
or you'd prefer it to be based on a different branch/commit/repo.

Thanks and BR,
Ricardo