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    SubjectRe: [PATCH 2/5] lguest guest feedback tidyups
    On Fri, 2007-05-11 at 07:56 +0100, Christoph Hellwig wrote:
    > On Fri, May 11, 2007 at 11:21:30AM +1000, Rusty Russell wrote:
    > > 1) send-dma and bind-dma hypercall wrappers for drivers to use,
    > > 2) formalization of the convention that devices can use the irq
    > > corresponding to their index on the lguest_bus.
    > > 3) ___force to shut up sparse: guests *can* use ioremap as virtual mem.
    > No, they can't. Even if in your case the underlying address spaces
    > happen to be the same anything returned by ioremap must use the proper
    > accessors. That's the whole point of having this separation, otherwise
    > you wouldn't need to use ioremap at all.

    Hi Christoph!

    Well, without ioremap, the memory wouldn't normally be mapped. Is
    there something better to use?

    > So instead of sprinkling cast
    > around add lguest_read*/lguest_write* accessors that do the __force cast
    > once and make sure the ioremap return value is always accessed using those.

    And that's nothing to do with iremap. They're required because guest
    "physical" == host virtual, and casting a long to a "__user void *"
    seems to require a __force.

    I enjoy a good Hellwigging as much as anyone, but your aim is off.


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