qemu-kvm/kvm-migration-Move-migrate_use_zero_copy_send-to-options.patch

From 6eb252887378d639ad2e90dd426a1812d4b72ca6 Mon Sep 17 00:00:00 2001
From: Juan Quintela <quintela@redhat.com>
Date: Wed, 1 Mar 2023 22:17:14 +0100
Subject: [PATCH 28/56] migration: Move migrate_use_zero_copy_send() to
 options.c
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RH-Author: Peter Xu <peterx@redhat.com>
RH-MergeRequest: 162: migration: Pretty failures for postcopy on unsupported memory types
RH-Bugzilla: 2057267
RH-Acked-by: Leonardo Brás <leobras@redhat.com>
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Acked-by: quintela1 <quintela@redhat.com>
RH-Commit: [27/50] 5a4c2b5e75c62e0f60f9c4121a2756bd140a60d9 (peterx/qemu-kvm)

Once that we are there, we rename the function to
migrate_zero_copy_send() to be consistent with all other capabilities.

We can remove the CONFIG_LINUX guard.  We already check that we can't
setup this capability in migrate_caps_check().

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
(cherry picked from commit b4bc342c766640e0cb8a0b72f71e0ee5545fb790)
Signed-off-by: Peter Xu <peterx@redhat.com>
---
 migration/migration.c | 13 +------------
 migration/migration.h |  5 -----
 migration/multifd.c   |  8 ++++----
 migration/options.c   |  9 +++++++++
 migration/options.h   |  1 +
 migration/socket.c    |  2 +-
 6 files changed, 16 insertions(+), 22 deletions(-)

diff --git a/migration/migration.c b/migration/migration.c
index e1d7f25786..1d63718e88 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -1609,7 +1609,7 @@ static bool migrate_params_check(MigrationParameters *params, Error **errp)
     }
 
 #ifdef CONFIG_LINUX
-    if (migrate_use_zero_copy_send() &&
+    if (migrate_zero_copy_send() &&
         ((params->has_multifd_compression && params->multifd_compression) ||
          (params->tls_creds && *params->tls_creds))) {
         error_setg(errp,
@@ -2595,17 +2595,6 @@ int migrate_multifd_zstd_level(void)
     return s->parameters.multifd_zstd_level;
 }
 
-#ifdef CONFIG_LINUX
-bool migrate_use_zero_copy_send(void)
-{
-    MigrationState *s;
-
-    s = migrate_get_current();
-
-    return s->capabilities[MIGRATION_CAPABILITY_ZERO_COPY_SEND];
-}
-#endif
-
 int migrate_use_tls(void)
 {
     MigrationState *s;
diff --git a/migration/migration.h b/migration/migration.h
index 49c0e13f41..c939f82d53 100644
--- a/migration/migration.h
+++ b/migration/migration.h
@@ -454,11 +454,6 @@ MultiFDCompression migrate_multifd_compression(void);
 int migrate_multifd_zlib_level(void);
 int migrate_multifd_zstd_level(void);
 
-#ifdef CONFIG_LINUX
-bool migrate_use_zero_copy_send(void);
-#else
-#define migrate_use_zero_copy_send() (false)
-#endif
 int migrate_use_tls(void);
 int migrate_use_xbzrle(void);
 uint64_t migrate_xbzrle_cache_size(void);
diff --git a/migration/multifd.c b/migration/multifd.c
index 6807328189..cce3ad6988 100644
--- a/migration/multifd.c
+++ b/migration/multifd.c
@@ -25,7 +25,7 @@
 #include "trace.h"
 #include "multifd.h"
 #include "threadinfo.h"
-
+#include "options.h"
 #include "qemu/yank.h"
 #include "io/channel-socket.h"
 #include "yank_functions.h"
@@ -608,7 +608,7 @@ int multifd_send_sync_main(QEMUFile *f)
      * all the dirty bitmaps.
      */
 
-    flush_zero_copy = migrate_use_zero_copy_send();
+    flush_zero_copy = migrate_zero_copy_send();
 
     for (i = 0; i < migrate_multifd_channels(); i++) {
         MultiFDSendParams *p = &multifd_send_state->params[i];
@@ -653,7 +653,7 @@ static void *multifd_send_thread(void *opaque)
     MigrationThread *thread = NULL;
     Error *local_err = NULL;
     int ret = 0;
-    bool use_zero_copy_send = migrate_use_zero_copy_send();
+    bool use_zero_copy_send = migrate_zero_copy_send();
 
     thread = MigrationThreadAdd(p->name, qemu_get_thread_id());
 
@@ -945,7 +945,7 @@ int multifd_save_setup(Error **errp)
         p->page_size = qemu_target_page_size();
         p->page_count = page_count;
 
-        if (migrate_use_zero_copy_send()) {
+        if (migrate_zero_copy_send()) {
             p->write_flags = QIO_CHANNEL_WRITE_FLAG_ZERO_COPY;
         } else {
             p->write_flags = 0;
diff --git a/migration/options.c b/migration/options.c
index 58673fc101..f357c99996 100644
--- a/migration/options.c
+++ b/migration/options.c
@@ -155,3 +155,12 @@ bool migrate_zero_blocks(void)
 
     return s->capabilities[MIGRATION_CAPABILITY_ZERO_BLOCKS];
 }
+
+bool migrate_zero_copy_send(void)
+{
+    MigrationState *s;
+
+    s = migrate_get_current();
+
+    return s->capabilities[MIGRATION_CAPABILITY_ZERO_COPY_SEND];
+}
diff --git a/migration/options.h b/migration/options.h
index d07269ee38..ad22f4d24a 100644
--- a/migration/options.h
+++ b/migration/options.h
@@ -32,5 +32,6 @@ bool migrate_postcopy_ram(void);
 bool migrate_release_ram(void);
 bool migrate_validate_uuid(void);
 bool migrate_zero_blocks(void);
+bool migrate_zero_copy_send(void);
 
 #endif
diff --git a/migration/socket.c b/migration/socket.c
index f4835a256a..1b6f5baefb 100644
--- a/migration/socket.c
+++ b/migration/socket.c
@@ -98,7 +98,7 @@ static void socket_outgoing_migration(QIOTask *task,
 
     trace_migration_socket_outgoing_connected(data->hostname);
 
-    if (migrate_use_zero_copy_send() &&
+    if (migrate_zero_copy_send() &&
         !qio_channel_has_feature(sioc, QIO_CHANNEL_FEATURE_WRITE_ZERO_COPY)) {
         error_setg(&err, "Zero copy send feature not detected in host kernel");
     }
-- 
2.39.1