On Mon, Sep 27, 2010 at 5:51 PM, Tim Deegan
<Tim.Deegan@xxxxxxxxxx> wrote:
At 04:35 +0100 on 27 Sep (1285562121), K.C. Lee wrote:
> Hi,
>
> I found that accumulate_guest_flags(struct vcpu *v, walk_t *gw) defined in xen 3.1.0 could not be found in xen 3.4.3.
>
> Also, I found that guest_walk_tables(struct vcpu *v, unsigned long va, walk_t *gw, ...) in xen 3.4.3 contanis code block: "guest_l1e_get_flags(gw->eff_l1e) ^ _PAGE_NX_BIT" which can only be found in accumulate_guest_flags. Besides, I also found a comment in "We will accumulate, in rc, the set of flags that are missing".
>
> I want to know if accumulate_guest_flags integrated into guest_walk_tables in the version of xen 3.4.3?
Yes. The HAP code had introduced its own pagetable-walking routines
which were missing some logic; they were merged with the original
shadow-code pagetable walker.
> And if so, how can I use guest_walk_tables instead of accumulate_guest_flags to get the same return value and walk_t *gw?
>
What exactly are you trying to do? For most purposes the function you
need is paging_gva_to_gfn(), which will find and walk the guest's
pagetables for you, and figure out the pagefault error code if you need
to inject a pagefault.
Dear Tim,
I'm a beginner of xen.
I'm trying to figure out what xen does when a page fault happened so I trace sh_page_fault() and then have many questions about what these functions do and how can I use them.
Would you please show me what paging_gva_to_gfn(), guest_walk_tables() and accumulate_guest_flags() do?
Is there any references to these functions?
Thank you very much.
Sincerely,
K.C.
Cheers,
Tim.
> Any suggestion is appreciated.
>
> Thank you very much.
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--
Tim Deegan <Tim.Deegan@xxxxxxxxxx>
Principal Software Engineer, XenServer Engineering
Citrix Systems UK Ltd. (Company #02937203, SL9 0BG)
