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Fwd: [Xen-devel] do_mmu_update

From: "Furquan Shaikh" <furquan.m.shaikh@xxxxxxxxx>

Date: Tue, 13 Jan 2009 17:41:52 +0530

Delivery-date: Tue, 13 Jan 2009 04:12:24 -0800

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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@xxxxxxxxx> 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@xxxxxxxxx> 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

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References:

[Xen-devel] do_mmu_update
- From: Furquan Shaikh