From a451644d96f572f5845d3ee523e54486da55d9ae Mon Sep 17 00:00:00 2001
From: Juan Quintela <quintela@redhat.com>
Date: Wed, 18 May 2022 02:52:24 -0300
Subject: [PATCH 13/34] multifd: Make zstd use iov's
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

RH-Author: Leonardo Brás <leobras@redhat.com>
RH-MergeRequest: 185: MSG_ZEROCOPY + Multifd @ rhel8.6
RH-Commit: [13/34] 37929ac695c7bdfe6e2f798d4f5e43a5e7525acb
RH-Bugzilla: 2117252
RH-Acked-by: quintela1 <quintela@redhat.com>
RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
RH-Acked-by: Peter Xu <peterx@redhat.com>

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
(cherry picked from commit 0a818b89eb8eaf79ae651405907d8110a0935cfd)
Signed-off-by: Leonardo Bras <leobras@redhat.com>
---
 migration/multifd-zstd.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/migration/multifd-zstd.c b/migration/multifd-zstd.c
index 2185a83eac..4e60cdbc54 100644
--- a/migration/multifd-zstd.c
+++ b/migration/multifd-zstd.c
@@ -156,6 +156,9 @@ static int zstd_send_prepare(MultiFDSendParams *p, Error **errp)
             return -1;
         }
     }
+    p->iov[p->iovs_num].iov_base = z->zbuff;
+    p->iov[p->iovs_num].iov_len = z->out.pos;
+    p->iovs_num++;
     p->next_packet_size = z->out.pos;
     p->flags |= MULTIFD_FLAG_ZSTD;
 
@@ -175,10 +178,7 @@ static int zstd_send_prepare(MultiFDSendParams *p, Error **errp)
  */
 static int zstd_send_write(MultiFDSendParams *p, uint32_t used, Error **errp)
 {
-    struct zstd_data *z = p->data;
-
-    return qio_channel_write_all(p->c, (void *)z->zbuff, p->next_packet_size,
-                                 errp);
+    return qio_channel_writev_all(p->c, p->iov, p->iovs_num, errp);
 }
 
 /**
-- 
2.35.3