On Fri, 31 May 2013, Catalin Marinas wrote:

On Fri, May 31, 2013 at 02:21:16PM +0100, Stefano Stabellini wrote:

quoted

On Fri, 31 May 2013, Catalin Marinas wrote:

quoted

On Thu, May 30, 2013 at 05:18:32PM +0100, Stefano Stabellini wrote:

quoted

--- 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.

MT_DEVICE_CACHED is Normal memory for ARMv7.

I didn't realize that MT_DEVICE_CACHED and MT_MEMORY end up having the
same AttrIndx encoding!
In that case yes, I should be able to use it.
I take that I should just implement ioremap_cached on arm64 as well?