Messages in this thread | | | Subject | Re: [PATCH v7 20/26] x86/cpufeature: Add User-Mode Instruction Prevention definitions | From | Ricardo Neri <> | Date | Wed, 10 May 2017 20:23:22 -0700 |
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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 <luto@kernel.org> > > Cc: Andrew Morton <akpm@linux-foundation.org> > > Cc: H. Peter Anvin <hpa@zytor.com> > > Cc: Borislav Petkov <bp@suse.de> > > Cc: Brian Gerst <brgerst@gmail.com> > > Cc: Chen Yucong <slaoub@gmail.com> > > Cc: Chris Metcalf <cmetcalf@mellanox.com> > > Cc: Dave Hansen <dave.hansen@linux.intel.com> > > Cc: Fenghua Yu <fenghua.yu@intel.com> > > Cc: Huang Rui <ray.huang@amd.com> > > Cc: Jiri Slaby <jslaby@suse.cz> > > Cc: Jonathan Corbet <corbet@lwn.net> > > Cc: Michael S. Tsirkin <mst@redhat.com> > > Cc: Paul Gortmaker <paul.gortmaker@windriver.com> > > Cc: Peter Zijlstra <peterz@infradead.org> > > Cc: Ravi V. Shankar <ravi.v.shankar@intel.com> > > Cc: Shuah Khan <shuah@kernel.org> > > Cc: Vlastimil Babka <vbabka@suse.cz> > > Cc: Tony Luck <tony.luck@intel.com> > > Cc: Paolo Bonzini <pbonzini@redhat.com> > > Cc: Liang Z. Li <liang.z.li@intel.com> > > Cc: Alexandre Julliard <julliard@winehq.org> > > Cc: Stas Sergeev <stsp@list.ru> > > Cc: x86@kernel.org > > Cc: linux-msdos@vger.kernel.org > > > > Signed-off-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com> > > 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
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