KVM: arm64: Invoke FPSIMD context switch trap from C

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 <[email protected]>
Reviewed-by: Marc Zyngier <[email protected]>
Reviewed-by: Christoffer Dall <[email protected]>
Reviewed-by: Alex Bennée <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>

0 files changed, 0 insertions, 0 deletions