From: Simon Martin <furryfuttock@gmail.com>
To: Ian Campbell <Ian.Campbell@citrix.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>, xen-devel@lists.xen.org
Subject: Re: Consuming PCI device in PV kernel
Date: Fri, 25 Jul 2014 15:36:30 +0100 [thread overview]
Message-ID: <263120224.20140725153630@gmail.com> (raw)
In-Reply-To: <1406298816.24842.19.camel@kazak.uk.xensource.com>
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@gmail.com
next prev parent reply other threads:[~2014-07-25 14:36 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-03 11:13 Consuming PCI device in PV kernel Simon Martin
2014-07-03 18:09 ` Konrad Rzeszutek Wilk
2014-07-07 8:21 ` Simon Martin
2014-07-07 11:22 ` Simon Martin
2014-07-07 12:21 ` Realtime access to PCI NIC Simon Martin
2014-07-08 14:46 ` Ian Campbell
2014-07-10 7:47 ` Simon Martin
2014-07-08 15:01 ` Consuming PCI device in PV kernel Konrad Rzeszutek Wilk
2014-07-10 7:54 ` Simon Martin
2014-07-11 16:47 ` Dario Faggioli
2014-07-15 8:37 ` Simon Martin
2014-07-15 14:56 ` Konrad Rzeszutek Wilk
2014-07-18 14:37 ` Simon Martin
2014-07-18 19:09 ` Konrad Rzeszutek Wilk
2014-07-21 10:13 ` Simon Martin
2014-07-21 10:53 ` Ian Campbell
2014-07-25 12:56 ` Simon Martin
2014-07-25 13:10 ` Ian Campbell
2014-07-25 13:21 ` Simon Martin
2014-07-25 13:37 ` Ian Campbell
2014-07-25 13:50 ` Andrew Cooper
2014-07-25 14:20 ` Simon Martin
2014-07-25 14:25 ` Andrew Cooper
2014-07-25 14:30 ` Simon Martin
2014-07-25 14:33 ` Ian Campbell
2014-07-25 14:36 ` Simon Martin [this message]
2014-07-25 14:28 ` Simon Martin
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