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> _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org https://lists.xen.org/xen-devel
