x86/P2M: allow 2M superpage use for shadowed guests

For guests in shadow mode the P2M table gets used only by software. The
only place where it matters whether superpages in the P2M can be dealt
with is sh_unshadow_for_p2m_change(): The table is never made accessible
to hardware for address translation, and the only checks of _PAGE_PSE in
P2M entries in shadow code are in this function (all others are against
guest page table entries). That function has been capable of handling
them even before commit 0ca1669871f8a ("P2M: check whether hap mode is
enabled before using 2mb pages") disabled 2M use in this case for
dubious reasons ("potential errors when hap is disabled").

While doing this, move "order" into more narrow scope and replace the
local variable "d" by a new "hap" one.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Tim Deegan <tim@xen.org>

diff --git a/xen/arch/x86/mm/p2m.c b/xen/arch/x86/mm/p2m.c
index a2446f0c418c3fd04ce9e6854e16ee6a03370da5..a405ee5fde697ad99f1ef7f79eb34770fe8d6153 100644 (file)
--- a/xen/arch/x86/mm/p2m.c
+++ b/xen/arch/x86/mm/p2m.c
@@ -403,28 +403,22 @@ struct page_info *p2m_get_page_from_gfn(
 int p2m_set_entry(struct p2m_domain *p2m, gfn_t gfn, mfn_t mfn,
                   unsigned int page_order, p2m_type_t p2mt, p2m_access_t p2ma)
 {
-    struct domain *d = p2m->domain;
+    bool hap = hap_enabled(p2m->domain);
     unsigned long todo = 1ul << page_order;
-    unsigned int order;
     int set_rc, rc = 0;
 
     ASSERT(gfn_locked_by_me(p2m, gfn));
 
     while ( todo )
     {
-        if ( hap_enabled(d) )
-        {
-            unsigned long fn_mask = !mfn_eq(mfn, INVALID_MFN) ? mfn_x(mfn) : 0;
-
-            fn_mask |= gfn_x(gfn) | todo;
-
-            order = (!(fn_mask & ((1ul << PAGE_ORDER_1G) - 1)) &&
-                     hap_has_1gb) ? PAGE_ORDER_1G :
-                    (!(fn_mask & ((1ul << PAGE_ORDER_2M) - 1)) &&
-                     hap_has_2mb) ? PAGE_ORDER_2M : PAGE_ORDER_4K;
-        }
-        else
-            order = 0;
+        unsigned long fn_mask = (!mfn_eq(mfn, INVALID_MFN) ? mfn_x(mfn) : 0) |
+                                gfn_x(gfn) | todo;
+        unsigned int order = (!(fn_mask & ((1ul << PAGE_ORDER_1G) - 1)) &&
+                              hap && hap_has_1gb)
+                             ? PAGE_ORDER_1G
+                             : (!(fn_mask & ((1ul << PAGE_ORDER_2M) - 1)) &&
+                                (!hap || hap_has_2mb))
+                               ? PAGE_ORDER_2M : PAGE_ORDER_4K;
 
         set_rc = p2m->set_entry(p2m, gfn, mfn, order, p2mt, p2ma, -1);
         if ( set_rc )