[dpdk-dev] [PATCH 4/4] vhost: avoid populate guest memory

[Jianfeng Tan]

It's not necessary to polulate guest memory from vhost side.

Cc: maxime.coque...@redhat.com
Cc: y...@fridaylinux.org

Signed-off-by: Jianfeng Tan <jianfeng....@intel.com>
---
 lib/librte_vhost/vhost_user.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
index 90ed211..9bd0391 100644
--- a/lib/librte_vhost/vhost_user.c
+++ b/lib/librte_vhost/vhost_user.c
@@ -644,6 +644,7 @@ vhost_user_set_mem_table(struct virtio_net *dev, struct 
VhostUserMsg *pmsg)
        uint64_t mmap_offset;
        uint64_t alignment;
        uint32_t i;
+       int populate;
        int fd;
 
        if (dev->mem && !vhost_memory_changed(&memory, dev->mem)) {
@@ -714,8 +715,9 @@ vhost_user_set_mem_table(struct virtio_net *dev, struct 
VhostUserMsg *pmsg)
                }
                mmap_size = RTE_ALIGN_CEIL(mmap_size, alignment);
 
+               populate = (dev->dequeue_zero_copy) ? MAP_POPULATE : 0;
                mmap_addr = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE,
-                                MAP_SHARED | MAP_POPULATE, fd, 0);
+                                MAP_SHARED | populate, fd, 0);
 
                if (mmap_addr == MAP_FAILED) {
                        RTE_LOG(ERR, VHOST_CONFIG,
-- 
2.7.4