[Qemu-devel] [PATCH v2 6/7] exec: Factor out section_covers_addr

[Fam Zheng <famz@redhat.com>]

This will be shared by the next patch.

Also add a comment explaining the unobvious condition on "size.hi".

Signed-off-by: Fam Zheng <famz@redhat.com>
---
 exec.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/exec.c b/exec.c
index ad8b826..b4e2eb5 100644
--- a/exec.c
+++ b/exec.c
@@ -307,6 +307,16 @@ static void phys_page_compact_all(AddressSpaceDispatch *d, int nodes_nb)
     }
 }
 
+static inline bool section_covers_addr(const MemoryRegionSection *section,
+                                       hwaddr addr)
+{
+    /* Memory topology clips a memory region to 2^64, size.hi >= 0 means the
+     * section must cover any addr. */
+    return section->size.hi ||
+           range_covers_byte(section->offset_within_address_space,
+                             section->size.lo, addr);
+}
+
 static MemoryRegionSection *phys_page_find(PhysPageEntry lp, hwaddr addr,
                                            Node *nodes, MemoryRegionSection *sections)
 {
@@ -322,9 +332,7 @@ static MemoryRegionSection *phys_page_find(PhysPageEntry lp, hwaddr addr,
         lp = p[(index >> (i * P_L2_BITS)) & (P_L2_SIZE - 1)];
     }
 
-    if (sections[lp.ptr].size.hi ||
-        range_covers_byte(sections[lp.ptr].offset_within_address_space,
-                          sections[lp.ptr].size.lo, addr)) {
+    if (section_covers_addr(&sections[lp.ptr], addr)) {
         return &sections[lp.ptr];
     } else {
         return &sections[PHYS_SECTION_UNASSIGNED];
-- 
2.4.3