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, 4 insertions, 3 deletions

diff --git a/hw/vfio/spapr.c b/hw/vfio/spapr.c
index e853eebe11..33692fc86f 100644
--- a/hw/vfio/spapr.c
+++ b/hw/vfio/spapr.c
@@ -196,14 +196,15 @@ int vfio_spapr_create_window(VFIOContainer *container,
      * bits_per_level is a safe guess of how much we can allocate per level:
      * 8 is the current minimum for CONFIG_FORCE_MAX_ZONEORDER and MAX_ORDER
      * is usually bigger than that.
-     * Below we look at getpagesize() as TCEs are allocated from system pages.
+     * Below we look at qemu_real_host_page_size as TCEs are allocated from
+     * system pages.
      */
-    bits_per_level = ctz64(getpagesize()) + 8;
+    bits_per_level = ctz64(qemu_real_host_page_size) + 8;
     create.levels = bits_total / bits_per_level;
     if (bits_total % bits_per_level) {
         ++create.levels;
     }
-    max_levels = (64 - create.page_shift) / ctz64(getpagesize());
+    max_levels = (64 - create.page_shift) / ctz64(qemu_real_host_page_size);
     for ( ; create.levels <= max_levels; ++create.levels) {
         ret = ioctl(container->fd, VFIO_IOMMU_SPAPR_TCE_CREATE, &create);
         if (!ret) {