ppc/pnv: fix xscom address translation for POWER9

High addresses can overflow the uint32_t pcba variable after the 8byte
shift.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

hw/ppc/pnv_xscom.c

@@ -124,8 +124,8 @@ static uint64_t xscom_read(void *opaque, hwaddr addr, unsigned width)
         goto complete;
     }
 
-    val = address_space_ldq(&chip->xscom_as, pcba << 3, MEMTXATTRS_UNSPECIFIED,
-                            &result);
+    val = address_space_ldq(&chip->xscom_as, (uint64_t) pcba << 3,
+                            MEMTXATTRS_UNSPECIFIED, &result);
     if (result != MEMTX_OK) {
         qemu_log_mask(LOG_GUEST_ERROR, "XSCOM read failed at @0x%"
                       HWADDR_PRIx " pcba=0x%08x\n", addr, pcba);
@@ -150,8 +150,8 @@ static void xscom_write(void *opaque, hwaddr addr, uint64_t val,
         goto complete;
     }
 
-    address_space_stq(&chip->xscom_as, pcba << 3, val, MEMTXATTRS_UNSPECIFIED,
-                      &result);
+    address_space_stq(&chip->xscom_as, (uint64_t) pcba << 3, val,
+                      MEMTXATTRS_UNSPECIFIED, &result);
     if (result != MEMTX_OK) {
         qemu_log_mask(LOG_GUEST_ERROR, "XSCOM write failed at @0x%"
                       HWADDR_PRIx " pcba=0x%08x data=0x%" PRIx64 "\n",