Re: [Xen-devel] [PATCH v2 4/4] x86/traps: honor EXT bit in error codes

2015-12-03 Thread Tian, Kevin
> From: Jan Beulich > Sent: Wednesday, November 11, 2015 5:23 PM > > The specification does not explicitly limit the use of this bit to > exceptions that can have selector style error codes, so to be on the > safe side we should deal with it being set even on error codes formally > documented to b

Re: [Xen-devel] [PATCH v2 4/4] x86/traps: honor EXT bit in error codes

2015-11-11 Thread Andrew Cooper
On 11/11/15 09:23, Jan Beulich wrote: > The specification does not explicitly limit the use of this bit to > exceptions that can have selector style error codes, so to be on the > safe side we should deal with it being set even on error codes formally > documented to be always zero (if they're inde

[Xen-devel] [PATCH v2 4/4] x86/traps: honor EXT bit in error codes

2015-11-11 Thread Jan Beulich
The specification does not explicitly limit the use of this bit to exceptions that can have selector style error codes, so to be on the safe side we should deal with it being set even on error codes formally documented to be always zero (if they're indeed always zero, the change is simply dead code