[Xen-devel] [PATCH v3 2/6] x86 / p2m: remove page_list check in p2m_alloc_table

[<pdurrant@xxxxxxxx>]

From: Paul Durrant <pdurrant@xxxxxxxxxx>

There does not seem to be any justification for refusing to create the
domain's p2m table simply because it may have assigned pages. Particularly
it prevents the prior allocation of PGC_extra pages.

Signed-off-by: Paul Durrant <pdurrant@xxxxxxxxxx>
---
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Cc: George Dunlap <george.dunlap@xxxxxxxxxx>
Cc: Wei Liu <wl@xxxxxxx>
Cc: "Roger Pau Monné" <roger.pau@xxxxxxxxxx>

v2:
 - New in v2
---
 xen/arch/x86/mm/p2m.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/xen/arch/x86/mm/p2m.c b/xen/arch/x86/mm/p2m.c
index 3719deae77..9fd4b115be 100644
--- a/xen/arch/x86/mm/p2m.c
+++ b/xen/arch/x86/mm/p2m.c
@@ -695,14 +695,6 @@ int p2m_alloc_table(struct p2m_domain *p2m)
 
     p2m_lock(p2m);
 
-    if ( p2m_is_hostp2m(p2m)
-         && !page_list_empty(&d->page_list) )
-    {
-        P2M_ERROR("dom %d already has memory allocated\n", d->domain_id);
-        p2m_unlock(p2m);
-        return -EINVAL;
-    }
-
     if ( pagetable_get_pfn(p2m_get_pagetable(p2m)) != 0 )
     {
         P2M_ERROR("p2m already allocated for this domain\n");
-- 
2.20.1


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