[PATCH V2] powerpc/mm: Add validation for platform reserved memory ranges

[Michael Ellerman]

On Mon, 2016-04-11 at 11:43 +0530, Anshuman Khandual wrote:
> On 03/07/2016 03:25 PM, Anshuman Khandual wrote:
> > For partition running on PHYP, there can be a adjunct partition
> > which shares the virtual address range with the operating system.
> > Virtual address ranges which can be used by the adjunct partition
> > are communicated with virtual device node of the device tree with
> > a property known as "ibm,reserved-virtual-addresses". This patch
> > introduces a new function named 'validate_reserved_va_range' which
> > is called  during initialization to validate that these reserved
> > virtual address ranges do not overlap with the address ranges used
> > by the kernel for all supported memory contexts. This helps prevent
> > the possibility of getting return codes similar to H_RESOURCE for
> > H_PROTECT hcalls for conflicting HPTE entries.
> > 
> > Signed-off-by: Anshuman Khandual <khandual at linux.vnet.ibm.com>
> > ---
> > - Tested on both POWER8 LE and BE platforms
> > 
> > Changes in V2:
> > - Added braces to the definition of LINUX_VA_BITS
> > - Adjusted tabs as spaces for the definition of PARTIAL_LINUX_VA_MASK
> 
> mpe, any updates on this ?

I'm just starting to look at things for next. So will try and get to it this
week.

cheers