From fba0ca227453ee6a60f674884531fb3817ca8a17 Mon Sep 17 00:00:00 2001 From: Seth Howell Date: Fri, 7 Dec 2018 13:10:42 -0700 Subject: [PATCH] malloc: notify primary process about hotplug in secondary When secondary process hotplugs memory, it sends a request to primary, which then performs the real mmap() and sends sync requests to all secondary processes. Upon receiving such sync request, each secondary process will notify the upper layers of hotplugged memory (and will call all locally registered event callbacks). In the end we'll end up with memory event callbacks fired in all the processes except the primary, which is a bug. This gets critical if memory is hotplugged while a VFIO device is attached, as the VFIO memory registration - which is done from a memory event callback present in the primary process only - is never called. After this patch, a primary process fires memory event callbacks before secondary processes start their synchronizations - both for hotplug and hotremove. Fixes: 07dcbfe0101f ("malloc: support multiprocess memory hotplug") Cc: stable@dpdk.org Signed-off-by: Seth Howell Signed-off-by: Darek Stojaczyk Reviewed-by: Anatoly Burakov --- lib/librte_eal/common/malloc_mp.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/lib/librte_eal/common/malloc_mp.c b/lib/librte_eal/common/malloc_mp.c index 5f2d4e0be9..f3a13353b1 100644 --- a/lib/librte_eal/common/malloc_mp.c +++ b/lib/librte_eal/common/malloc_mp.c @@ -209,6 +209,8 @@ handle_alloc_request(const struct malloc_mp_req *m, map_addr = ms[0]->addr; + eal_memalloc_mem_event_notify(RTE_MEM_EVENT_ALLOC, map_addr, alloc_sz); + /* we have succeeded in allocating memory, but we still need to sync * with other processes. however, since DPDK IPC is single-threaded, we * send an asynchronous request and exit this callback. @@ -258,6 +260,9 @@ handle_request(const struct rte_mp_msg *msg, const void *peer __rte_unused) if (m->t == REQ_TYPE_ALLOC) { ret = handle_alloc_request(m, entry); } else if (m->t == REQ_TYPE_FREE) { + eal_memalloc_mem_event_notify(RTE_MEM_EVENT_FREE, + m->free_req.addr, m->free_req.len); + ret = malloc_heap_free_pages(m->free_req.addr, m->free_req.len); } else { @@ -436,6 +441,9 @@ handle_sync_response(const struct rte_mp_msg *request, memset(&rb_msg, 0, sizeof(rb_msg)); /* we've failed to sync, so do a rollback */ + eal_memalloc_mem_event_notify(RTE_MEM_EVENT_FREE, + state->map_addr, state->map_len); + rollback_expand_heap(state->ms, state->ms_len, state->elem, state->map_addr, state->map_len); -- 2.20.1