memory: make section size a 128-bit integer

So far, the size of all regions passed to listeners could fit in 64 bits,
because artificial regions (containers and aliases) are eliminated by
the memory core, leaving only device regions which have reasonable sizes

An IOMMU however cannot be eliminated by the memory core, and may have
an artificial size, hence we may need 65 bits to represent its size.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

2 files changed, 23 insertions, 1 deletions

diff --git a/include/exec/memory.h b/include/exec/memory.h
index c11a3f8e9c..fddc6ada27 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -26,6 +26,9 @@
 #include "exec/ioport.h"
 #include "qemu/int128.h"
 
+#define MAX_PHYS_ADDR_SPACE_BITS 62
+#define MAX_PHYS_ADDR            (((hwaddr)1 << MAX_PHYS_ADDR_SPACE_BITS) - 1)
+
 typedef struct MemoryRegionOps MemoryRegionOps;
 typedef struct MemoryRegionPortio MemoryRegionPortio;
 typedef struct MemoryRegionMmio MemoryRegionMmio;
@@ -185,7 +188,7 @@ struct MemoryRegionSection {
     MemoryRegion *mr;
     AddressSpace *address_space;
     hwaddr offset_within_region;
-    uint64_t size;
+    Int128 size;
     hwaddr offset_within_address_space;
     bool readonly;
 };
diff --git a/include/qemu/int128.h b/include/qemu/int128.h
index b3864b6cd4..bfe7678a04 100644
--- a/include/qemu/int128.h
+++ b/include/qemu/int128.h
@@ -34,6 +34,25 @@ static inline Int128 int128_2_64(void)
     return (Int128) { 0, 1 };
 }
 
+static inline Int128 int128_and(Int128 a, Int128 b)
+{
+    return (Int128) { a.lo & b.lo, a.hi & b.hi };
+}
+
+static inline Int128 int128_rshift(Int128 a, int n)
+{
+    int64_t h;
+    if (!n) {
+        return a;
+    }
+    h = a.hi >> (n & 63);
+    if (n >= 64) {
+        return (Int128) { h, h >> 63 };
+    } else {
+        return (Int128) { (a.lo >> n) | (a.hi << (64 - n)), h };
+    }
+}
+
 static inline Int128 int128_add(Int128 a, Int128 b)
 {
     Int128 r = { a.lo + b.lo, a.hi + b.hi };