[Xen-devel] Re: [PATCH]blkfront change to support unmodified linux

[Xiaofeng Ling <xiaofeng.ling@xxxxxxxxx>]

Keir Fraser wrote:
> On 5 Sep 2005, at 06:41, Xiaofeng Ling wrote:
>
> > This patch is to make blkfront can work both in xen-linux and in
> > unmodified guest which is shadow_model_translate enabled.
>
> phys == machine from the p.o.v. of a shadow-translated guest, so why not 
> modify virt_to_mfn and friends appropriately?
Sorry, I don't catch your meaning.
vmx guest is in shadow-translate mode, and gpfn need to translate to mfn 
in hypervisor. see the macro:
#define __gpfn_to_mfn(_d, gpfn)                        \
    ({                                                 \
        ASSERT(current->domain == (_d));               \
        (shadow_mode_translate(_d))                    \
        ? get_mfn_from_pfn(gpfn)                \
        : (gpfn);                                      \
    })

#define __gpfn_to_mfn_foreign(_d, gpfn)                \
    ( (shadow_mode_translate(_d))                      \
      ? gpfn_to_mfn_foreign(_d, gpfn)                  \
      : (gpfn) )

So I rename virt_to_mfn to virt_to_xfn which means if not in shadow 
translate mode, it will do translate in guest. for vmx guest, don't need 
the translation in guest. What is your suggestion?
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