Re: [PATCH v2 11/13] hw/intc/arm_gicv3_its: Factor out "find address of table entry" code

["Alex Bennée" <alex.bennee@linaro.org>]

Peter Maydell <peter.maydell@linaro.org> writes:

> The ITS has several tables which all share a similar format,
> described by the TableDesc struct: the guest may configure them
> to be a single-level table or a two-level table. Currently we
> open-code the process of finding the table entry in all the
> functions which read or write the device table or the collection
> table. Factor out the "get the address of the table entry"
> logic into a new function, so that the code which needs to
> read or write a table entry only needs to call table_entry_addr()
> and then perform a suitable load or store to that address.
>
> Note that the error handling is slightly complicated because
> we want to handle two cases differently:
>  * failure to read the L1 table entry should end up causing
>    a command stall, like other kinds of DMA error
>  * an L1 table entry that says there is no L2 table for this
>    index (ie whose valid bit is 0) must result in us treating
>    the table entry as not-valid on read, and discarding
>    writes (this is mandated by the spec)
>
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>

-- 
Alex Bennée