core: replace getpagesize() with qemu_real_host_page_size

There are three page size in qemu:

  real host page size
  host page size
  target page size

All of them have dedicate variable to represent. For the last two, we
use the same form in the whole qemu project, while for the first one we
use two forms: qemu_real_host_page_size and getpagesize().

qemu_real_host_page_size is defined to be a replacement of
getpagesize(), so let it serve the role.

[Note] Not fully tested for some arch or device.

Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Message-Id: <20191013021145.16011-3-richardw.yang@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/migration/postcopy-ram.c b/migration/postcopy-ram.c
index abccafc8c8..a36402722b 100644
--- a/migration/postcopy-ram.c
+++ b/migration/postcopy-ram.c
@@ -308,7 +308,7 @@ static bool ufd_check_and_apply(int ufd, MigrationIncomingState *mis)
         return false;
     }
 
-    if (getpagesize() != ram_pagesize_summary()) {
+    if (qemu_real_host_page_size != ram_pagesize_summary()) {
         bool have_hp = false;
         /* We've got a huge page */
 #ifdef UFFD_FEATURE_MISSING_HUGETLBFS
@@ -346,7 +346,7 @@ static int test_ramblock_postcopiable(RAMBlock *rb, void *opaque)
  */
 bool postcopy_ram_supported_by_host(MigrationIncomingState *mis)
 {
-    long pagesize = getpagesize();
+    long pagesize = qemu_real_host_page_size;
     int ufd = -1;
     bool ret = false; /* Error unless we change it */
     void *testarea = NULL;