Re: [PATCH v2 1/4] exec/memattrs: Add iopmp source id, start address, end address to MemTxAttrs

[Peter Maydell]

On Tue, 7 Nov 2023 at 03:02, Ethan Chen <ethan84@andestech.com> wrote:
>
> On Mon, Nov 06, 2023 at 10:34:41AM +0000, Peter Maydell wrote:
> > What AXI bus signals? You already get address and size in the
> > actual memory transaction, they don't need to go in the MemTxAttrs.
> >
>
> A burst contains multiple continuous read or write operations. In current
> transaction, I can only get the size and address of a single operation. IOPMP
> checks not only a single operation but also the burst information. I propose
> to add those signals to MemTxAttrs.

QEMU doesn't emulate bus transactions at that level -- we have
no concept of burst transactions. You should have the IOMMU
do whatever it would do for a series of simple transactions.

thanks
-- PMM