On Fri, Nov 11, 2016 at 03:39:26PM +0000, Andrew Cooper wrote: > On 10/11/16 16:06, Jan Beulich wrote: > > So far we didn't guarantee 16-byte alignment of the stack: While (so > > far) we don't tell the compiler to use smaller alignment, we also don't > > guarantee 16-byte alignment when establishing stack pointers for new > > vCPU-s. Runtime service functions using SSE instructions may end with > > #GP(0) without that. > > > > Note that -mpreferred-stack-boundary=3 is can be used only from gcc 4.8 > > onwards, and -mincoming-stack-boundary=3 only from 5.3 onwards. It is > > for that reason that an alternative approach (using higher than > > necessary alignment) is being used when building with such older > > compilers. > > > > Furthermore we should avoid #MF to be raised on the FLDCW we do. > > > > Signed-off-by: Jan Beulich <jbeul...@suse.com> > > Acked-by: Andrew Cooper <andrew.coop...@citrix.com>
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