Re: [Xen-devel] question about page_to_phys

[Xiaofeng Ling <xiaofeng.ling@xxxxxxxxx>]

Keir Fraser wrote:
> On 1 Sep 2005, at 10:19, Xiaofeng Ling wrote:
>
> If a guest is in translate mode it should have no concept of pseudophys
> vs machine. That translation is hidden from it. Hence there should be
> no need to hack the virtual drivers -- page_to_phys() should naturally
> translate to pseudophys if SHADOW_TRANSLATE is configured.
>
>   -- Keir
so we need such a patch? but how to deal with virt_to_mfn in blkfront.c?

diff -r 9092486cc4b3 linux-2.6-xen-sparse/include/asm-xen/asm-i386/io.h
--- a/linux-2.6-xen-sparse/include/asm-xen/asm-i386/io.h
+++ b/linux-2.6-xen-sparse/include/asm-xen/asm-i386/io.h
@@ -101,7 +101,11 @@
  * Change "struct page" to physical address.
  */
 #define page_to_pseudophys(page) ((dma_addr_t)page_to_pfn(page) << 
PAGE_SHIFT)
+#ifndef CONFIG_SHADOW_TRANSLATE
 #define page_to_phys(page) 
(phys_to_machine(page_to_pseudophys(page)))
+#else
+#define page_to_phys(page)      (page_to_pseudophys(page))
+#endif

 #define bio_to_pseudophys(bio)  (page_to_pseudophys(bio_page((bio))) + \
                                  (unsigned long) bio_offset((bio)))

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