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

[Kaustubh Kabra <kaustubhwise@xxxxxxxxx>]

Hi,
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 ?

Now can I allocate this mapped memory reserved by Xen hypervisor to
any domain through any existing or my new hypercall?

--
Regards,
Kaustubh Kabra
Pune Institute Of Computer  Technology,
University of Pune,
India.

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