On Tue, Jun 11, 2019 at 05:27:15PM +0000, Prakhya, Sai Praneeth wrote:
> 1. Since we already have "type" file, which is "read-only", we could make it
> R/W.
>
> The present value shows the existing type of default domain.
> If user wants to change it (Eg: from DMA to IDENTITY or vice versa), he
> attempts to write the new value.
> Kernel performs checks to make sure that the driver in unbinded and it's safe
> to change the default domain type.
> After successfully changing the default_domain type internally, kernel
> reflects the new value in the file.
> Ay errors in the process will be reported in dmesg.
I prefer this way. Writing to the file should fail with -EBUSY when it
is not safe to change the default domain-type. Writing should only
succeed when no device in the group is assigned to a device driver.
Regards,
Joerg
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