From: Simon Martin <furryfuttock@gmail.com>
To: Ian Campbell <Ian.Campbell@citrix.com>
Cc: xen-devel@lists.xen.org
Subject: Re: Realtime access to PCI NIC
Date: Thu, 10 Jul 2014 08:47:24 +0100 [thread overview]
Message-ID: <11710529870.20140710084724@gmail.com> (raw)
In-Reply-To: <1404830785.24591.2.camel@kazak.uk.xensource.com>
Thanks Ian,
Tuesday, July 8, 2014, 3:46:25 PM, you wrote:
> Only PCI cfg reads/writes go via the backend, I think. Any MMIO space
> (i.e. described in the PCI BARS) can be directly mapped, likewise for
> the IO port spaces associated with the device.
> I think PCI cfg space is only generally used during probing/setup etc.
> Hopefully you don't need to poke it at runtime?
You have confirmed the conclusion that I was coming to!
> Right, VT-d allows the MMIO stuff to be mapped to an HVM guest (PV
> doesn't even need that), but unfortunately there are bits in the pci cfg
> space which even a guest with the device passed to it shouldn't be able
> to mess with (I don't know the details though).
Perfect.
--
Best regards,
Simon mailto:furryfuttock@gmail.com
next prev parent reply other threads:[~2014-07-10 7:47 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 [this message]
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
2014-07-25 14:28 ` Simon Martin
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