Re: [Xen-devel] [PATCH 17/17] PVH xen: PVH dom0 creation....

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 26.04.13 at 03:18, Mukesh Rathor <mukesh.rathor@xxxxxxxxxx> wrote:
> On Wed, 24 Apr 2013 10:28:35 +0100
> "Jan Beulich" <JBeulich@xxxxxxxx> wrote:
> 
>> >>> On 23.04.13 at 23:26, Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>
>> >>> wrote:
>> > +    /* If the e820 ended under 4GB, we must map the remaining
>> > space upto 4GB */
>> > +    if ( end < GB(4) )
>> > +    {
>> > +        start_pfn = PFN_UP(end);
>> > +        end_pfn = (GB(4)) >> PAGE_SHIFT;
>> > +        nump = end_pfn - start_pfn;
>> > +        rc = domctl_memory_mapping(d, start_pfn, start_pfn, nump,
>> > 1);
>> > +        BUG_ON(rc);
>> > +    }
>> 
>> That's necessary, but not sufficient. Or did I overlook MMIO ranges
>> getting added somewhere else for Dom0, when they sit above the
>> highest E820 covered address?
> 
> construct_dom0() adds the entire range:
> 
>     /* DOM0 is permitted full I/O capabilities. */
>     rc |= ioports_permit_access(dom0, 0, 0xFFFF);
>     rc |= iomem_permit_access(dom0, 0UL, ~0UL);

Which does not create any mappings at all - these are just
permissions being granted.

Jan


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