[PATCH 1/6] arm64: mm: Add __virt_to_idmap() to keep kvm build happy

[catalin.marinas@arm.com (Catalin Marinas)]

On Fri, Nov 15, 2013 at 03:29:52PM +0000, Marc Zyngier wrote:
> On 15/11/13 15:25, Santosh Shilimkar wrote:
> > On Friday 15 November 2013 10:05 AM, Marc Zyngier wrote:
> >> On 14/11/13 19:37, Santosh Shilimkar wrote:
> >>> ARM kvm code will make use of __virt_to_idmap() on arm32
> >>> machines as hardware interconnect supported alias of physical
> >>> memory for idmap purposes. The same code is shared with arm64
> >>> bit and hence will break the builds. So we add __virt_to_idmap()
> >>> which is just __virt_to_phys() on arm64 bit to keep build happy.
> >>>
> >>> Cc: Catalin Marinas <catalin.marinas@arm.com>
> >>> Cc: Will Deacon <will.deacon@arm.com>
> >>> Cc: Marc Zyngier <marc.zyngier@arm.com>
> >>> Cc: Christoffer Dall <christoffer.dall@linaro.org>
> >>>
> >>> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
> >>> ---
> >>>  arch/arm64/include/asm/memory.h |    8 ++++++++
> >>>  1 file changed, 8 insertions(+)
> >>>
> >>> diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
> >>> index 3776217..d9341ee 100644
> >>> --- a/arch/arm64/include/asm/memory.h
> >>> +++ b/arch/arm64/include/asm/memory.h
> >>> @@ -75,6 +75,14 @@
> >>>  #define __phys_to_virt(x)	((unsigned long)((x) - PHYS_OFFSET + PAGE_OFFSET))
> >>>  
> >>>  /*
> >>> + * Added to keep arm64 kvm build working which shares code with
> >>> + * 32bit port. ARM kvm code makes use of __virt_to_idmap() on arm32
> >>> + * machines as hardware interconnect supported alias of physical
> >>> + * memory for idmap purposes.
> >>> + */
> >>> +#define virt_to_idmap(x)	__virt_to_phys(x)
> >>> +
> >>> +/*
> >>>   * Convert a physical address to a Page Frame Number and back
> >>>   */
> >>>  #define	__phys_to_pfn(paddr)	((unsigned long)((paddr) >> PAGE_SHIFT))
> >>>
> >>
> >> I'd rather have a kvm_virt_to_phys() in kvm_mmu.h. That's how we've
> >> dealt with that kind of difference so far.
> >>
> > Are you suggesting something like below ?
> 
> Yes, I like it a lot more.
> 
> Catalin, what do you think?

It looks better ;)

-- 
Catalin