Re: [Xen-devel] address translation in hvm mode

[rajneesh rana <rajneeshrana009@xxxxxxxxx>]

thanx for suggestion

printk trace shows that it using sh_gva_to_gfn. Inside guest_walk_to_gfn,  a call to function guest_l1e_get_flags returns 0.

I think it work only for v==current. Is there any other approach that i can take.

you mentions about hap_gva_to_gfn. When hvm uses this hap_gva_to_gfn depending upon hardware.

regards 
rajneesh rana

Tim Deegan <Tim.Deegan@xxxxxxxxxx> wrote:

At 04:54 -0800 on 29 Jan (1201582491), rajneesh rana wrote:
> i am new to xen-development and currently trying to understand memory mgmt in hvm mode
> I am writing a hypercall which takes input of virtual address of domu. hypercall translate this address to machine and return 4kb page from thereafter.
> Inside hypercall, i m using paging_gva_to_gfn function but it returns -1 instead of returning valid gfn.
>
> what wrong with my approach.

It should work, though I'm not sure that any other code calls
paging_gva_to_gfn() with v != current. It will depend on the hardware
you run on whether the function called is actually hap_gva_to_gfn_
or sh_gva_to_gfn; you could try instrumenting with printk or otherwise.

Cheers,

Tim.

--
Tim Deegan
Principal Software Engineer, Citrix Systems (R&D) Ltd.
[Company #02300071, SL9 0DZ, UK.]

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