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Re: [Xen-devel] [PATCH v2 2/3] x86/mm: rename and tidy create_pae_xen_mappings()
- To: Jan Beulich <jbeulich@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Mon, 6 Jan 2020 16:16:39 +0000
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- Cc: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Mon, 06 Jan 2020 16:17:00 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 06/01/2020 15:35, Jan Beulich wrote:
> After dad74b0f9e ("i386: fix handling of Xen entries in final L2 page
> table") and the removal of 32-bit support the function doesn't modify
> state anymore, and hence its name has been misleading. Change its name,
> constify parameters and a local variable, and make it return bool.
>
> Also drop the call to it from mod_l3_entry(): The function explicitly
> disallows 32-bit domains to modify slot 3. This way we also won't
> re-check slot 3 when a slot other than slot 3 changes. Doing so has
> needlessly disallowed making some L2 table recursively link back to an
> L2 used in some L3's 3rd slot, as we check for the type ref count to be
> 1. (Note that allowing dynamic changes of L3 entries in the way we do is
> bogus anyway, as that's not how L3s behave in the native and EPT cases:
> They get re-evaluated only upon CR3 reloads. NPT is different in this
> regard.)
>
> As a result of this we no longer need to play games to get at the start
> of the L3 table.
>
> Additionally move the single remaining call site, allowing to drop one
> is_pv_32bit_domain() invocation and a _PAGE_PRESENT check (in the
> function itself) as well as to exit the loop early (remaining entries
> have all ben set to empty just ahead of this loop).
been.
>
> Further move a BUG_ON() such that in the common case its condition
> wouldn't need evaluating.
>
> Finally, since we're at it, move init_xen_pae_l2_slots() next to the
> renamed function, as they really belong together (in fact
> init_xen_pae_l2_slots() was [indirectly] broken out of this function).
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
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