qemu-kvm/SOURCES/kvm-multifd-Make-zlib-use-iov-s.patch

From 1cdab9cadef1ed84ec34651a1edbffa36c1e67d0 Mon Sep 17 00:00:00 2001
From: Juan Quintela <quintela@redhat.com>
Date: Wed, 18 May 2022 02:52:24 -0300
Subject: [PATCH 12/37] multifd: Make zlib use iov's
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RH-Author: Leonardo Brás <leobras@redhat.com>
RH-MergeRequest: 191: MSG_ZEROCOPY + Multifd @ rhel8.7
RH-Commit: [12/26] 58630452e14802e71a9eadb17cfe4964ebf8e091
RH-Bugzilla: 2072049
RH-Acked-by: Peter Xu <peterx@redhat.com>
RH-Acked-by: Daniel P. Berrangé <berrange@redhat.com>
RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
(cherry picked from commit 48a4a44c1cde382c6b8e7792d01fe7d9b0a59c69)
Signed-off-by: Leonardo Bras <leobras@redhat.com>
---
 migration/multifd-zlib.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/migration/multifd-zlib.c b/migration/multifd-zlib.c
index a987e4a26c..96475e096e 100644
--- a/migration/multifd-zlib.c
+++ b/migration/multifd-zlib.c
@@ -145,6 +145,9 @@ static int zlib_send_prepare(MultiFDSendParams *p, Error **errp)
         }
         out_size += available - zs->avail_out;
     }
+    p->iov[p->iovs_num].iov_base = z->zbuff;
+    p->iov[p->iovs_num].iov_len = out_size;
+    p->iovs_num++;
     p->next_packet_size = out_size;
     p->flags |= MULTIFD_FLAG_ZLIB;
 
@@ -164,10 +167,7 @@ static int zlib_send_prepare(MultiFDSendParams *p, Error **errp)
  */
 static int zlib_send_write(MultiFDSendParams *p, uint32_t used, Error **errp)
 {
-    struct zlib_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