Replace qemu_real_host_page variables with inlined functions

Replace the global variables with inlined helper functions. getpagesize() is very
likely annotated with a "const" function attribute (at least with glibc), and thus
optimization should apply even better.

This avoids the need for a constructor initialization too.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20220323155743.1585078-12-marcandre.lureau@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

5 files changed, 16 insertions, 16 deletions

diff --git a/hw/virtio/vhost-iova-tree.c b/hw/virtio/vhost-iova-tree.c
index 55fed1f..67bf6d5 100644
--- a/hw/virtio/vhost-iova-tree.c
+++ b/hw/virtio/vhost-iova-tree.c
@@ -11,7 +11,7 @@
 #include "qemu/iova-tree.h"
 #include "vhost-iova-tree.h"
 
-#define iova_min_addr qemu_real_host_page_size
+#define iova_min_addr qemu_real_host_page_size()
 
 /**
  * VhostIOVATree, able to:
@@ -86,7 +86,7 @@ const DMAMap *vhost_iova_tree_find_iova(const VhostIOVATree *tree,
 int vhost_iova_tree_map_alloc(VhostIOVATree *tree, DMAMap *map)
 {
     /* Some vhost devices do not like addr 0. Skip first page */
-    hwaddr iova_first = tree->iova_first ?: qemu_real_host_page_size;
+    hwaddr iova_first = tree->iova_first ?: qemu_real_host_page_size();
 
     if (map->translated_addr + map->size < map->translated_addr ||
         map->perm == IOMMU_NONE) {
diff --git a/hw/virtio/vhost-shadow-virtqueue.c b/hw/virtio/vhost-shadow-virtqueue.c
index b232803..1e5cfe2 100644
--- a/hw/virtio/vhost-shadow-virtqueue.c
+++ b/hw/virtio/vhost-shadow-virtqueue.c
@@ -471,14 +471,14 @@ size_t vhost_svq_driver_area_size(const VhostShadowVirtqueue *svq)
     size_t avail_size = offsetof(vring_avail_t, ring) +
                                              sizeof(uint16_t) * svq->vring.num;
 
-    return ROUND_UP(desc_size + avail_size, qemu_real_host_page_size);
+    return ROUND_UP(desc_size + avail_size, qemu_real_host_page_size());
 }
 
 size_t vhost_svq_device_area_size(const VhostShadowVirtqueue *svq)
 {
     size_t used_size = offsetof(vring_used_t, ring) +
                                     sizeof(vring_used_elem_t) * svq->vring.num;
-    return ROUND_UP(used_size, qemu_real_host_page_size);
+    return ROUND_UP(used_size, qemu_real_host_page_size());
 }
 
 /**
@@ -533,11 +533,11 @@ void vhost_svq_start(VhostShadowVirtqueue *svq, VirtIODevice *vdev,
     svq->vring.num = virtio_queue_get_num(vdev, virtio_get_queue_index(vq));
     driver_size = vhost_svq_driver_area_size(svq);
     device_size = vhost_svq_device_area_size(svq);
-    svq->vring.desc = qemu_memalign(qemu_real_host_page_size, driver_size);
+    svq->vring.desc = qemu_memalign(qemu_real_host_page_size(), driver_size);
     desc_size = sizeof(vring_desc_t) * svq->vring.num;
     svq->vring.avail = (void *)((char *)svq->vring.desc + desc_size);
     memset(svq->vring.desc, 0, driver_size);
-    svq->vring.used = qemu_memalign(qemu_real_host_page_size, device_size);
+    svq->vring.used = qemu_memalign(qemu_real_host_page_size(), device_size);
     memset(svq->vring.used, 0, device_size);
     svq->ring_id_maps = g_new0(VirtQueueElement *, svq->vring.num);
     for (unsigned i = 0; i < svq->vring.num - 1; i++) {
diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c
index 6abbc9d..9c4f84f 100644
--- a/hw/virtio/vhost-user.c
+++ b/hw/virtio/vhost-user.c
@@ -1166,7 +1166,7 @@ static int vhost_user_set_vring_num(struct vhost_dev *dev,
 static void vhost_user_host_notifier_free(VhostUserHostNotifier *n)
 {
     assert(n && n->unmap_addr);
-    munmap(n->unmap_addr, qemu_real_host_page_size);
+    munmap(n->unmap_addr, qemu_real_host_page_size());
     n->unmap_addr = NULL;
 }
 
@@ -1503,7 +1503,7 @@ static int vhost_user_slave_handle_vring_host_notifier(struct vhost_dev *dev,
                                                        int fd)
 {
     int queue_idx = area->u64 & VHOST_USER_VRING_IDX_MASK;
-    size_t page_size = qemu_real_host_page_size;
+    size_t page_size = qemu_real_host_page_size();
     struct vhost_user *u = dev->opaque;
     VhostUserState *user = u->user;
     VirtIODevice *vdev = dev->vdev;
diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
index 8adf7c0..bc54f9f 100644
--- a/hw/virtio/vhost-vdpa.c
+++ b/hw/virtio/vhost-vdpa.c
@@ -468,7 +468,7 @@ err:
 static void vhost_vdpa_host_notifier_uninit(struct vhost_dev *dev,
                                             int queue_index)
 {
-    size_t page_size = qemu_real_host_page_size;
+    size_t page_size = qemu_real_host_page_size();
     struct vhost_vdpa *v = dev->opaque;
     VirtIODevice *vdev = dev->vdev;
     VhostVDPAHostNotifier *n;
@@ -485,7 +485,7 @@ static void vhost_vdpa_host_notifier_uninit(struct vhost_dev *dev,
 
 static int vhost_vdpa_host_notifier_init(struct vhost_dev *dev, int queue_index)
 {
-    size_t page_size = qemu_real_host_page_size;
+    size_t page_size = qemu_real_host_page_size();
     struct vhost_vdpa *v = dev->opaque;
     VirtIODevice *vdev = dev->vdev;
     VhostVDPAHostNotifier *n;
@@ -875,7 +875,7 @@ static bool vhost_vdpa_svq_unmap_ring(struct vhost_vdpa *v,
         return false;
     }
 
-    size = ROUND_UP(result->size, qemu_real_host_page_size);
+    size = ROUND_UP(result->size, qemu_real_host_page_size());
     r = vhost_vdpa_dma_unmap(v, result->iova, size);
     return r == 0;
 }
diff --git a/hw/virtio/virtio-mem.c b/hw/virtio/virtio-mem.c
index f55dcf6..35cbf1f 100644
--- a/hw/virtio/virtio-mem.c
+++ b/hw/virtio/virtio-mem.c
@@ -53,11 +53,11 @@ static uint32_t virtio_mem_default_thp_size(void)
 #if defined(__x86_64__) || defined(__arm__) || defined(__powerpc64__)
     default_thp_size = 2 * MiB;
 #elif defined(__aarch64__)
-    if (qemu_real_host_page_size == 4 * KiB) {
+    if (qemu_real_host_page_size() == 4 * KiB) {
         default_thp_size = 2 * MiB;
-    } else if (qemu_real_host_page_size == 16 * KiB) {
+    } else if (qemu_real_host_page_size() == 16 * KiB) {
         default_thp_size = 32 * MiB;
-    } else if (qemu_real_host_page_size == 64 * KiB) {
+    } else if (qemu_real_host_page_size() == 64 * KiB) {
         default_thp_size = 512 * MiB;
     }
 #endif
@@ -120,7 +120,7 @@ static uint64_t virtio_mem_default_block_size(RAMBlock *rb)
     const uint64_t page_size = qemu_ram_pagesize(rb);
 
     /* We can have hugetlbfs with a page size smaller than the THP size. */
-    if (page_size == qemu_real_host_page_size) {
+    if (page_size == qemu_real_host_page_size()) {
         return MAX(page_size, virtio_mem_thp_size());
     }
     return MAX(page_size, VIRTIO_MEM_MIN_BLOCK_SIZE);
@@ -135,7 +135,7 @@ static bool virtio_mem_has_shared_zeropage(RAMBlock *rb)
      * fresh page, consuming actual memory.
      */
     return !qemu_ram_is_shared(rb) && rb->fd < 0 &&
-           qemu_ram_pagesize(rb) == qemu_real_host_page_size;
+           qemu_ram_pagesize(rb) == qemu_real_host_page_size();
 }
 #endif /* VIRTIO_MEM_HAS_LEGACY_GUESTS */