[Xen-devel] get_gfn_query() locking

["Jan Beulich" <JBeulich@xxxxxxxx>]

Tim, Andres,

while looking at how "X86/vMCE: handle broken page occurred
before migration" uses the p2m code, I wondered whether the
comment

 * N.B. get_gfn_query() is the _only_ one guaranteed not to take the
 * p2m lock; none of the others can be called with the p2m or paging
 * lock held. */

isn't stale - afaict with get_gfn_type_access() passing "1" for the
"locked" parameter of __get_gfn_type_access(), there's no way
to avoid the locking without using __get_gfn_type_access()
directly. And then again, with the p2m lock being recursive these
days, I don't think there's any harm calling the other methods
here with that lock held.

Jan


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