Hi Folks,
I want to allocate a page in xen and share it with a domain so that I can use it for shared memory communication.

I have allocated a page in Xen using
base = _xmalloc(PAGE_SIZE, 0);
base_pa = virt_to_phys(base);

I pass this physical address of the page i.e. base_pa to dom0. I also permit access to this page to dom0 using

ret = iomem_permit_access(d, base_pa, 1);

from dom0, I try to ioremap this page in dom0 using the base_pa and ioremap function

base = (unsigned long) ioremap(base_pa, PAGE_SIZE);

but the call to ioremap fails. Could anyone please tell me what I am doing wrong? What is the correct way to do this.

Thanks,
Sanjay

--
----------------------
PhD Student, Georgia Tech
http://www.cc.gatech.edu/~ksanjay/