From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jianfeng Tan Subject: [PATCH 4/4] vhost: avoid populate guest memory Date: Wed, 14 Feb 2018 04:01:32 +0000 Message-ID: <1518580892-32656-5-git-send-email-jianfeng.tan@intel.com> References: <1518580892-32656-1-git-send-email-jianfeng.tan@intel.com> Cc: Jianfeng Tan , maxime.coquelin@redhat.com, yliu@fridaylinux.org To: dev@dpdk.org Return-path: Received: from mga06.intel.com (mga06.intel.com [134.134.136.31]) by dpdk.org (Postfix) with ESMTP id EEAB81B31B for ; Wed, 14 Feb 2018 04:59:50 +0100 (CET) In-Reply-To: <1518580892-32656-1-git-send-email-jianfeng.tan@intel.com> List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" It's not necessary to polulate guest memory from vhost side. Cc: maxime.coquelin@redhat.com Cc: yliu@fridaylinux.org Signed-off-by: Jianfeng Tan --- 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