Re: [RFC PATCH 0/3] generic hypercall support

Gregory Haskins
2009-05-07T21:14:12Z

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Arnd Bergmann wrote:
> On Thursday 07 May 2009, Gregory Haskins wrote:
>
>> What I am not clear on is how you would know to flag the address to
>> begin with.
>>
>
> pci_iomap could look at the bus device that the PCI function sits on.
> If it detects a PCI bridge that has a certain property (config space
> setting, vendor/device ID, ...), it assumes that the device itself
> will be emulated and it should set the address flag for IO_COND.
>
> This implies that all pass-through devices need to be on a different
> PCI bridge from the emulated devices, which should be fairly
> straightforward to enforce.
>

Thats actually a pretty good idea.

Chris, is that issue with the non ioread/iowrite access of a mangled
pointer still an issue here? I would think so, but I am a bit fuzzy on
whether there is still an issue of non-wrapped MMIO ever occuring.

-Greg

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