do_mmu_update

do_mmu_update

[Furquan Shaikh]

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Hello friends,
Can anyone please tell me what the *not_a_pt: *label in do_mmu_update used
for?

*default:
not_a_pt:
                    {
                        if ( unlikely(!get_page_type(page,
PGT_writable_page)) )
                                    break;

                        perfc_incr(writable_mmu_updates);
                        okay = paging_write_guest_entry(v, va, req.val,
_mfn(mfn));

                        put_page_type(page);
                    }
                    break;


*Regards,
Furquan

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Fwd: do_mmu_update

[Furquan Shaikh]

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Can you please explain a bit more about it? Isnt this the default for the
switch case where matches with any of the l1, l2, l3 are not found. what
does this default of *not_a_pt *signify

Thanks,
Furquan


On Tue, Jan 13, 2009 at 5:26 PM, gkkkk kgv <gkcdri@gmail.com> wrote:

> Hello,
>        *not_a_pt this one will decide that whether before writing to the
> mmu ,the page type is matching all the conditions or not.*
>
> **
> Thanks
> vijay
>
>
>
> On Tue, Jan 13, 2009 at 5:20 PM, Furquan Shaikh <
> furquan.m.shaikh@gmail.com> wrote:
>
>> Hello friends,
>> Can anyone please tell me what the *not_a_pt: *label in do_mmu_update
>> used for?
>>
>> *default:
>> not_a_pt:
>>                     {
>>                         if ( unlikely(!get_page_type(page,
>> PGT_writable_page)) )
>>                                     break;
>>
>>                         perfc_incr(writable_mmu_updates);
>>                         okay = paging_write_guest_entry(v, va, req.val,
>> _mfn(mfn));
>>
>>                         put_page_type(page);
>>                     }
>>                     break;
>>
>>
>> *Regards,
>> Furquan
>>
>> _______________________________________________
>> Xen-devel mailing list
>> Xen-devel@lists.xensource.com
>> http://lists.xensource.com/xen-devel
>>
>>
>

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Re: Fwd: do_mmu_update

[Jeremy Fitzhardinge]

Furquan Shaikh wrote:
>
>
> Can you please explain a bit more about it? Isnt this the default for 
> the switch case where matches with any of the l1, l2, l3 are not 
> found. what does this default of /not_a_pt /signify

You can use do_mmu_update to write a pte entry in a page which is not 
(yet) considered to be a pagetable.

    J