[Xen-devel] Confused about Xen memory management.

[Rusty Russell <rusty@xxxxxxxxxxxxxxx>]

OK, so I am implementing a prototype where Linux hands an address into
Xen, which gets decremented later (ie. when Xen is executing a different
domain).  It seems that map_domain_mem() is what I want, but how do I
get the physical address of the variable?  virt_to_phys() in Linux
doesn't seem to do the trick, nor virt_to_phys() in Xen.

ie, pseudo code:

linux/mydriver.c:
        static int foo = 1;

        // virt_to_phys(foo) maybe?
        HYPERVISOR_mytest(&foo);

xen/common/test.c:
        int mytest(unsigned long addr)
        {
                // virt_to_phys(addr) maybe?
                manip_later->addr = addr;
                return 0;
        }

        // Some time later
        ...
        int *p = map_domain_mem(manip_later->addr);
        (*p)++;
        unmap_domain_mem(p);

Sorry for the stupid question; I hate VM.
Rusty.
-- 
A bad analogy is like a leaky screwdriver -- Richard Braakman



-------------------------------------------------------
SF email is sponsored by - The IT Product Guide
Read honest & candid reviews on hundreds of IT Products from real users.
Discover which products truly live up to the hype. Start reading now.
http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxxxx
https://lists.sourceforge.net/lists/listinfo/xen-devel