On Mon, 2020-11-09 at 14:52 +0100, Lucas Stach wrote:
> Am Montag, den 09.11.2020, 14:44 +0100 schrieb Rouven Czerwinski:
> > Annotate the different read and write functions with
> > zero_page_{access/faulting}. This allows the cfi_flash driver to be used
> > on the QEMU virt machine with an enabled MMU.
>
> I don't like this zero-page access allow in a driver at all. If you
> have some free address space somewhere, you could also solve this issue
> by remapping the IO resource to somewhere else in the address space,
> deviating from the 1:1 mapping. The Tegra PCIe host driver does this,
> if you need some inspiration.
I totally agree, remapping the IO region sounds like a much better
choice.
Regards,
Rouven
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