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From: Ian Campbell <ian.campbell@citrix.com>
To: Julien Grall <julien.grall@citrix.com>
Cc: Prasun Kapoor <Prasun.kapoor@caviumnetworks.com>,
	"Kumar, Vijaya" <Vijaya.Kumar@caviumnetworks.com>,
	Manish Jaggi <mjaggi@caviumnetworks.com>,
	"xen-devel@lists.xen.org" <xen-devel@lists.xen.org>,
	Stefano Stabellini <stefano.stabellini@citrix.com>,
	"Kulkarni, Ganapatrao" <Ganapatrao.Kulkarni@caviumnetworks.com>
Subject: Re: PCI Pass-through in Xen ARM - Draft 2.
Date: Mon, 29 Jun 2015 11:50:09 +0100	[thread overview]
Message-ID: <1435575009.32500.258.camel@citrix.com> (raw)
In-Reply-To: <55911E66.2040009@citrix.com>

On Mon, 2015-06-29 at 11:31 +0100, Julien Grall wrote:
> Hi Manish,
> 
> On 28/06/15 19:38, Manish Jaggi wrote:
> > 4.1 Holes in guest memory space
> > ----------------------------
> > Holes are added in the guest memory space for mapping pci device's BAR
> > regions.
> > These are defined in arch-arm.h
> > 
> > /* For 32bit */
> > GUEST_MMIO_HOLE0_BASE, GUEST_MMIO_HOLE0_SIZE
> >  
> > /* For 64bit */
> > GUEST_MMIO_HOLE1_BASE , GUEST_MMIO_HOLE1_SIZE
> 
> The memory layout for 32bit and 64bit are exactly the same. Why do you
> need to differ here?

I took this to be a "hole under 4GB" and a "hole over 4GB" IOW rather
than specific to 32-bit/64-bit guests it is specific to 32/64 bit
devices, the latter of which could be placed higher in RAM, which is
useful since the space under 4GB is naturally more limited.

Ian.

  reply	other threads:[~2015-06-29 10:50 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-06-28 18:38 PCI Pass-through in Xen ARM - Draft 2 Manish Jaggi
2015-06-29 10:31 ` Julien Grall
2015-06-29 10:50   ` Ian Campbell [this message]
2015-06-29 11:00     ` Julien Grall
2015-07-05  5:55   ` Manish Jaggi
2015-07-06  6:13     ` Manish Jaggi
2015-07-06  9:11     ` Ian Campbell
2015-07-06 10:06       ` Manish Jaggi
2015-07-06 10:20         ` Ian Campbell
2015-07-29  9:37           ` Manish Jaggi
2015-07-30  9:54             ` Ian Campbell
2015-07-30 12:51               ` Manish Jaggi
2015-07-30 14:39                 ` Ian Campbell
2015-07-31  7:46                   ` Manish Jaggi
2015-07-31  8:05                     ` Ian Campbell
2015-07-31 10:32                       ` Ian Campbell
2015-07-31 14:24                         ` Konrad Rzeszutek Wilk
2015-07-31 11:07                       ` Manish Jaggi
2015-07-31 11:19                         ` Ian Campbell
2015-07-31 12:50                           ` Manish Jaggi
2015-07-31 12:57                             ` Ian Campbell
2015-07-31 12:59                             ` Julien Grall
2015-07-31 13:27                               ` Ian Campbell
2015-07-31 14:33                               ` Manish Jaggi
2015-07-31 14:56                                 ` Julien Grall
2015-07-31 15:12                                   ` Manish Jaggi
2015-07-31 15:13                                     ` Julien Grall
2015-07-06 10:43     ` Julien Grall
2015-07-06 11:09       ` Manish Jaggi
2015-07-06 11:45         ` Julien Grall
2015-07-07  7:10           ` Manish Jaggi
2015-07-07  8:18             ` Julien Grall
2015-07-07  8:46               ` Manish Jaggi
2015-07-07 10:54                 ` Manish Jaggi
2015-07-07 11:24                 ` Ian Campbell
2015-07-09  7:13                   ` Manish Jaggi
2015-07-09  8:08                     ` Julien Grall
2015-07-09 10:30                       ` Manish Jaggi
2015-07-09 13:57                         ` Julien Grall
2015-07-10  6:07                           ` Pranavkumar Sawargaonkar
2015-07-14 16:37                       ` Stefano Stabellini
2015-07-14 16:46                         ` Stefano Stabellini
2015-07-14 16:58                           ` Julien Grall
2015-07-14 18:01                             ` Stefano Stabellini
2015-07-22  5:41                               ` Manish Jaggi
2015-07-22  8:34                                 ` Julien Grall
2015-07-14 16:47                   ` Stefano Stabellini
2015-07-07 15:27     ` Konrad Rzeszutek Wilk
2015-06-29 15:34 ` Ian Campbell
2015-07-05  6:07 Manish Jaggi
2015-07-06  9:07 ` Ian Campbell

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