Re: [Xen-devel] Re: Doubt regarding virtual memory mapping from hypervisor to a domain

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

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@xxxxxxxxxx
> > wrote:
> 
> > > From: Kaustubh Kabra [mailto:kaustubhwise@xxxxxxxxx]
> > > 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?


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