Re: [Xen-devel] Consuming PCI device in PV kernel

[Simon Martin <furryfuttock@xxxxxxxxx>]

Hello Ian,

>> > Once you grant map a page from another domain, your domain no longer
>> > owns the PTE.  You should either avoid that PTE, or grant unmap the
>> > foreign frame first.
>> 
>> I  have  not  grant mapped this. I have just called update_va_mapping.
>> Should I be using grant?

> Andrew is saying that the mapping which is currently at the virtual
> address is *already* a grant mapping, not that you are trying to grant
> map something here. Grant maps need to be unmapped with the grant unmap
> hypercall, not just by rewriting the PTE. (IIRC).

> You should not be using grants to map PCI IO space, no.

Thanks  Ian. I'm off traveling next week so I'll pick up on this again
in August. I wonder what has grant mapped this memory area....

-- 
Best regards,
 Simon                            mailto:furryfuttock@xxxxxxxxx


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