From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: Re: Doubt regarding virtual memory mapping from
	hypervisor to a domain
Date: Thu, 10 Feb 2011 10:13:22 -0500
Message-ID: <20110210151322.GA9981@dumpdata.com>
References: <AANLkTim1TzbX7mEXGYr3kBdY+E-4Y-8eNAYjnT3dWeYe@mail.gmail.com>
	<7270db8c-d71a-4ab7-84fb-02ee256b44b7@default>
	<AANLkTimfRCQrmKKe5XjzRSH89fg+suKVAVsqpKacMjLv@mail.gmail.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Return-path: <xen-devel-bounces@lists.xensource.com>
Content-Disposition: inline
In-Reply-To: <AANLkTimfRCQrmKKe5XjzRSH89fg+suKVAVsqpKacMjLv@mail.gmail.com>
List-Unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xensource.com>
List-Help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-Subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
Sender: xen-devel-bounces@lists.xensource.com
Errors-To: xen-devel-bounces@lists.xensource.com
To: Kaustubh Kabra <kaustubhwise@gmail.com>
Cc: Dan Magenheimer <dan.magenheimer@oracle.com>, xen-devel@lists.xensource.com, vasani.ashwin@gmail.com, Tim.Deegan@citrix.com, jeremy@goop.org, kabrakaustubh@gmail.com, keir@xen.org
List-Id: xen-devel@lists.xenproject.org

On Thu, Feb 10, 2011 at 06:56:52PM +0530, Kaustubh Kabra wrote:
> On Mon, Jan 31, 2011 at 9:06 PM, Dan Magenheimer <dan.magenheimer@oracle.com
> > wrote:
> 
> > > From: Kaustubh Kabra [mailto:kaustubhwise@gmail.com]
> > > I have allocated few order=9 pages in Xen memory space using
> > > alloc_domheap_pages(NULL,9,0) during boot time just before domain is
> > > created (dom0 = domain_create(0, DOMCRF_s3_integrity, DOM0_SSIDREF) in
> > > xen/arch/x86/setup.c).
> > >
> > > I got the following virtual addresses in xen log message-
> > > (XEN) a2k2: Virt_addr:ffff83011cc00000   MFN:11cc00
> > > (XEN) a2k2: Virt_addr:ffff83011ca00000   MFN:11ca00
> > > (XEN) a2k2: Virt_addr:ffff83011c800000   MFN:11c800
> > > (XEN) a2k2: Virt_addr:ffff83011c600000   MFN:11c600
> > > (XEN) a2k2: Virt_addr:ffff83011c400000   MFN:11c400
> > > (XEN) a2k2: Virt_addr:ffff83011c200000   MFN:11c200
> > > (XEN) a2k2: Virt_addr:ffff83011c000000   MFN:11c000
> > > (XEN) a2k2: Virt_addr:ffff83011be00000   MFN:11be00
> > >
> > > As per config.h file Xen memory map,the virtual mapping shows that the
> > > memory is  allocated in
> > > 1:1 direct mapping of all physical memory .Can anyone elaborate
> > > regarding this mapping ?
> >
> > It's not clear what you are asking.  Can you be more precise?
> >
> > > Now can I allocate this mapped memory reserved by Xen hypervisor to
> > > any domain through any existing or my new hypercall?
> >
> >
> Precisely, i want to allocate this mfn to a requesting domain by making a
> PMD entry. I tried using xen_set_pte and other hugetlb functions but it
> cannot write as it is in read-only area . So, I passed this new formed PTE
> formed using this mfn to hypervisor and tried setting the required PMD entry
> to this new PTE, but xen crashes .

With what?