On Wed, Mar 09, 2016 at 03:25:58AM -0700, Jan Beulich wrote: > Btw., one more thing: Can't the exclusion of FP and SSE states in the logic > determining which state set to save be extended to also include YMM? If saved, > YMM will also always live at a fixed place (an ASSERT() or BUG_ON() to verify > would of course be desirable). And if the guest didn't touch YMM registers, > the > respective bit in the mask won't be set anyway. > YMM do live at the begining of the xsave extended area. But when we exclude YMM like FP/SSE states ,if guest set YMM | XSTATE_NONLAZY respective bitin xcro_accum, the over-writing may happend too. In such case , vcpu_xsave_mask will return XSTATE_NONLAZY, the first xstate of XSTATE_NONLAZY will be xsaved at the begining of xsave extended area which may over-write YMM state. Do I miss something ? > Jan > > > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xen.org > http://lists.xen.org/xen-devel
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