[xen staging] x86/P2M: move map_domain_gfn() (again)

[patchbot@xxxxxxx]

commit 470f260d5315f0895915ab1433fd067e3b21540c
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Wed Feb 9 12:48:59 2022 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Feb 9 12:48:59 2022 +0100

    x86/P2M: move map_domain_gfn() (again)
    
    The main user is the guest walking code, so move it back there; commit
    9a6787cc3809 ("x86/mm: build map_domain_gfn() just once") would perhaps
    better have kept it there in the first place. This way it'll only get
    built when it's actually needed (and still only once).
    
    This also eliminates one more CONFIG_HVM conditional from p2m.c.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: George Dunlap <george.dunlap@xxxxxxxxxx>
---
 xen/arch/x86/mm/guest_walk.c | 50 ++++++++++++++++++++++++++++++++++++++++++
 xen/arch/x86/mm/p2m.c        | 52 --------------------------------------------
 2 files changed, 50 insertions(+), 52 deletions(-)

diff --git a/xen/arch/x86/mm/guest_walk.c b/xen/arch/x86/mm/guest_walk.c
index b9f607272c..35d543ca5f 100644
--- a/xen/arch/x86/mm/guest_walk.c
+++ b/xen/arch/x86/mm/guest_walk.c
@@ -532,6 +532,56 @@ guest_walk_tables(const struct vcpu *v, struct p2m_domain 
*p2m,
     return walk_ok;
 }
 
+#if GUEST_PAGING_LEVELS == CONFIG_PAGING_LEVELS
+/*
+ * If the map is non-NULL, we leave this function having acquired an extra ref
+ * on mfn_to_page(*mfn).  In all cases, *pfec contains appropriate
+ * synthetic/structure PFEC_* bits.
+ */
+void *map_domain_gfn(struct p2m_domain *p2m, gfn_t gfn, mfn_t *mfn,
+                     p2m_query_t q, uint32_t *pfec)
+{
+    p2m_type_t p2mt;
+    struct page_info *page;
+
+    if ( !gfn_valid(p2m->domain, gfn) )
+    {
+        *pfec = PFEC_reserved_bit | PFEC_page_present;
+        return NULL;
+    }
+
+    /* Translate the gfn, unsharing if shared. */
+    page = p2m_get_page_from_gfn(p2m, gfn, &p2mt, NULL, q);
+    if ( p2m_is_paging(p2mt) )
+    {
+        ASSERT(p2m_is_hostp2m(p2m));
+        if ( page )
+            put_page(page);
+        p2m_mem_paging_populate(p2m->domain, gfn);
+        *pfec = PFEC_page_paged;
+        return NULL;
+    }
+    if ( p2m_is_shared(p2mt) )
+    {
+        if ( page )
+            put_page(page);
+        *pfec = PFEC_page_shared;
+        return NULL;
+    }
+    if ( !page )
+    {
+        *pfec = 0;
+        return NULL;
+    }
+
+    *pfec = PFEC_page_present;
+    *mfn = page_to_mfn(page);
+    ASSERT(mfn_valid(*mfn));
+
+    return map_domain_page(*mfn);
+}
+#endif
+
 /*
  * Local variables:
  * mode: C
diff --git a/xen/arch/x86/mm/p2m.c b/xen/arch/x86/mm/p2m.c
index 27cb91d18a..c1cff37709 100644
--- a/xen/arch/x86/mm/p2m.c
+++ b/xen/arch/x86/mm/p2m.c
@@ -1965,58 +1965,6 @@ unsigned long paging_gva_to_gfn(struct vcpu *v,
     return hostmode->gva_to_gfn(v, hostp2m, va, pfec);
 }
 
-#endif /* CONFIG_HVM */
-
-/*
- * If the map is non-NULL, we leave this function having acquired an extra ref
- * on mfn_to_page(*mfn).  In all cases, *pfec contains appropriate
- * synthetic/structure PFEC_* bits.
- */
-void *map_domain_gfn(struct p2m_domain *p2m, gfn_t gfn, mfn_t *mfn,
-                     p2m_query_t q, uint32_t *pfec)
-{
-    p2m_type_t p2mt;
-    struct page_info *page;
-
-    if ( !gfn_valid(p2m->domain, gfn) )
-    {
-        *pfec = PFEC_reserved_bit | PFEC_page_present;
-        return NULL;
-    }
-
-    /* Translate the gfn, unsharing if shared. */
-    page = p2m_get_page_from_gfn(p2m, gfn, &p2mt, NULL, q);
-    if ( p2m_is_paging(p2mt) )
-    {
-        ASSERT(p2m_is_hostp2m(p2m));
-        if ( page )
-            put_page(page);
-        p2m_mem_paging_populate(p2m->domain, gfn);
-        *pfec = PFEC_page_paged;
-        return NULL;
-    }
-    if ( p2m_is_shared(p2mt) )
-    {
-        if ( page )
-            put_page(page);
-        *pfec = PFEC_page_shared;
-        return NULL;
-    }
-    if ( !page )
-    {
-        *pfec = 0;
-        return NULL;
-    }
-
-    *pfec = PFEC_page_present;
-    *mfn = page_to_mfn(page);
-    ASSERT(mfn_valid(*mfn));
-
-    return map_domain_page(*mfn);
-}
-
-#ifdef CONFIG_HVM
-
 static unsigned int mmio_order(const struct domain *d,
                                unsigned long start_fn, unsigned long nr)
 {
--
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