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From 10aadee745539521945b4d6482717011eeb15fc2 Mon Sep 17 00:00:00 2001
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From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
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Date: Wed, 1 Aug 2018 13:55:17 +0100
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Subject: [PATCH 13/21] migration: update index field when delete or qsort
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RDMALocalBlock
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RH-Author: Dr. David Alan Gilbert <dgilbert@redhat.com>
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Message-id: <20180801135522.11658-14-dgilbert@redhat.com>
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Patchwork-id: 81574
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O-Subject: [qemu-kvm RHEL8/virt212 PATCH 13/18] migration: update index field when delete or qsort RDMALocalBlock
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Bugzilla: 1594384
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RH-Acked-by: Peter Xu <peterx@redhat.com>
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RH-Acked-by: John Snow <jsnow@redhat.com>
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RH-Acked-by: Juan Quintela <quintela@redhat.com>
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From: Lidong Chen <jemmy858585@gmail.com>
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rdma_delete_block function deletes RDMALocalBlock base on index field,
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but not update the index field. So when next time invoke rdma_delete_block,
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it will not work correctly.
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If start and cancel migration repeatedly, some RDMALocalBlock not invoke
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ibv_dereg_mr to decrease kernel mm_struct vmpin. When vmpin is large than
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max locked memory limitation, ibv_reg_mr will failed, and migration can not
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start successfully again.
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Signed-off-by: Lidong Chen <lidongchen@tencent.com>
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Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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Message-Id: <1525618499-1560-1-git-send-email-lidongchen@tencent.com>
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Signed-off-by: Juan Quintela <quintela@redhat.com>
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Signed-off-by: Lidong Chen <jemmy858585@gmail.com>
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(cherry picked from commit 71cd73061c014d04bc6b54936e675347ebc8d964)
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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migration/rdma.c | 7 +++++++
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1 file changed, 7 insertions(+)
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diff --git a/migration/rdma.c b/migration/rdma.c
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index da474fc..7d233b0 100644
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--- a/migration/rdma.c
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+++ b/migration/rdma.c
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@@ -708,6 +708,9 @@ static int rdma_delete_block(RDMAContext *rdma, RDMALocalBlock *block)
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memcpy(local->block + block->index, old + (block->index + 1),
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sizeof(RDMALocalBlock) *
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(local->nb_blocks - (block->index + 1)));
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+ for (x = block->index; x < local->nb_blocks - 1; x++) {
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+ local->block[x].index--;
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+ }
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}
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} else {
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assert(block == local->block);
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@@ -3246,6 +3249,10 @@ static int qemu_rdma_registration_handle(QEMUFile *f, void *opaque)
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qsort(rdma->local_ram_blocks.block,
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rdma->local_ram_blocks.nb_blocks,
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sizeof(RDMALocalBlock), dest_ram_sort_func);
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+ for (i = 0; i < local->nb_blocks; i++) {
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+ local->block[i].index = i;
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+ }
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+
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if (rdma->pin_all) {
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ret = qemu_rdma_reg_whole_ram_blocks(rdma);
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if (ret) {
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--
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1.8.3.1
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