Re: [Xen-devel] [PATCH RFC 5/6] arm64/xen: implement xen_remap on arm64

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Fri, 31 May 2013, Catalin Marinas wrote:
> On Thu, May 30, 2013 at 05:18:32PM +0100, Stefano Stabellini wrote:
> > --- a/arch/arm/include/asm/xen/page.h
> > +++ b/arch/arm/include/asm/xen/page.h
> > @@ -90,6 +90,10 @@ static inline bool set_phys_to_machine(unsigned long 
> > pfn, unsigned long mfn)
> >     return __set_phys_to_machine(pfn, mfn);
> >  }
> >  
> > +#ifdef CONFIG_ARM64
> > +#define xen_remap(cookie, size) __ioremap((cookie), (size), 
> > __pgprot(PROT_NORMAL))
> > +#else
> >  #define xen_remap(cookie, size) __arm_ioremap((cookie), (size), MT_MEMORY);
> > +#endif
> 
> Now I saw the ARM-specific part. Can you not use something like
> ioremap_cached() which would give normal cacheable memory (at least on
> ARMv7).

No, I cannot because ioremap_cached uses MT_DEVICE_CACHED, while this
needs to be MT_MEMORY. It is used for normal memory pages, not device
memory.

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