Re: [PATCH v2] target/s390x: Implement the MVPG condition-code-option bit

[Richard Henderson <richard.henderson@linaro.org>]

On 3/2/21 5:39 PM, Richard Henderson wrote:
> If the CCO bit is set, MVPG should not generate an exception
> but report page translation faults via a CC code.  Create a new
> helper, access_prepare_nf, which can use probe_access_flags in
> non-faulting mode.
> 
> Cc: David Hildenbrand<david@redhat.com>
> Reported-by: Thomas Huth<thuth@redhat.com>
> Signed-off-by: Richard Henderson<richard.henderson@linaro.org>
> ---
>   target/s390x/mem_helper.c | 76 +++++++++++++++++++++++++++------------
>   1 file changed, 53 insertions(+), 23 deletions(-)

Oh, I meant to say that this is untested, but is what I was
talking about wrt performing only a single lookup per page.


r~