Re: [PATCH v8 1/4] accel/tcg: Add TLB invalidation support for ranges of addresses

[Richard Henderson]

On 5/4/21 8:04 PM, Rebecca Cran wrote:
> Add functions to support the FEAT_TLBIRANGE ARMv8.4 feature that adds
> TLB invalidation instructions to invalidate ranges of addresses.
>
> Signed-off-by: Rebecca Cran<rebecca@nuviainc.com>
> ---
>   accel/tcg/cputlb.c      | 128 +++++++++++++++++++-
>   include/exec/exec-all.h |  46 +++++++
>   2 files changed, 171 insertions(+), 3 deletions(-)

I guess this is ok.

I would have switched things around such that tlb_flush_page_bits_locked used 
tlb_flush_range_locked, passing TARGET_PAGE_SIZE for the length.

I would check for a very long length and flush the whole tlb, lest we spend too 
long going round and round the same set of tlb entries.

I would not skip the third function in the triple, *_all_cpus, which is unused 
by arm but we have for every other tlb flushing function in this set.

I'll whip something up and post it.


r~