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

[Anshuman Khandual]

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 ?