From: Simon Martin <furryfuttock@gmail.com>
To: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Ian Campbell <Ian.Campbell@citrix.com>, xen-devel@lists.xen.org
Subject: Re: Consuming PCI device in PV kernel
Date: Fri, 25 Jul 2014 15:20:48 +0100 [thread overview]
Message-ID: <13170235.20140725152048@gmail.com> (raw)
In-Reply-To: <53D2609A.4000802@citrix.com>
Hello Andrew,
>>>>> Looking at the code I can't see where bit 22 is being set!
>>>> Without seeing you code I've no idea about this (even if I could see it,
>>>> I dunno...)
>>> Bit 22 is being set in Xen code.
>> Hopefully someone who knows the x86 PV stuff can chime in then, I looked
>> but can't see what this represents.
> I suspect this would be:
> /* Bit 22 of a 24-bit flag mask. This corresponds to bit 62 of a pte.*/
> #define _PAGE_GNTTAB (1U<<22)
> from include/asm-x86/x86_64/page.h
> So you are attempting to update a pte which already has a granted page
> in it.
That's weird as I have only one domU running, so nothing else could
have claimed the PCI memory area. The PCI has been passed through as I
see the mapping in xenstore.
Should I be using a different hypercall to gain access to this memory
area?
--
Best regards,
Simon mailto:furryfuttock@gmail.com
next prev parent reply other threads:[~2014-07-25 14:20 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 [this message]
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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