On Wed, May 09, 2018 at 05:13:05PM +0100, Dave Martin wrote: > The conversion of the FPSIMD context switch trap code to C has added > some overhead to calling it, due to the need to save registers that > the procedure call standard defines as caller-saved. > > So, perhaps it is no longer worth invoking this trap handler quite > so early. > > Instead, we can invoke it from fixup_guest_exit(), with little > likelihood of increasing the overhead much further. > > As a convenience, this patch gives __hyp_switch_fpsimd() the same > return semantics fixup_guest_exit(). For now there is no > possibility of a spurious FPSIMD trap, so the function always > returns true, but this allows it to be tail-called with a single > return statement. > > Signed-off-by: Dave Martin <Dave.Martin@xxxxxxx> > Reviewed-by: Marc Zyngier <marc.zyngier@xxxxxxx> Reviewed-by: Christoffer Dall <christoffer.dall@xxxxxxx> _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
