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2b6009d646
Emulate MSA related parts of COP0 interface so that the guest will be able to enable/disable MSA (Config5.MSAEn) once the MSA capability has been wired up. As with the FPU (Status.CU1) setting Config5.MSAEn has no immediate effect if the MSA state isn't live, as MSA state is restored lazily on first use. Changes after the MSA state has been restored take immediate effect, so that the guest can start getting MSA disabled exceptions right away for guest MSA operations. The MSA state is saved lazily too, as MSA may get re-enabled in the near future anyway. A special case is also added for when Status.CU1 is set while FR=0 and the MSA state is live. In this case we are at risk of getting reserved instruction exceptions if we try and save the MSA state, so we lose the MSA state sooner while MSA is still usable. Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Paul Burton <paul.burton@imgtec.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Gleb Natapov <gleb@kernel.org> Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org |
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