[Xen-devel] PGT_locked questions

[Andres Lagar Cavilla <andres.lagarcavilla@xxxxxxxxx>]

Hi,
PGT_locked can mutually exclude CPUs trying to work on the same page.
I have a few questions
1. shouldn't page_lock/unlock call preempt_disable/enable respectively?
2. It seems to be used only for pv page table self-updates. Is there
any obscure reason its usage is confined to only this, any dark
secrets why it can't be used elsewhere?

And here is my plan
1. remove horrible global shr_lock by following up on Adin Scannell's
removal of the sharing hash table
2. Still, concurrent additions/deletions of gfn_info list elements to
a shared page need to be protected. I'm thinking of using PGT_locked
for this. Sounds good?

Thanks
Andres

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