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94 lines
3.8 KiB
94 lines
3.8 KiB
From 0753565af588dfa78b3529e359b1590e15fcbdb3 Mon Sep 17 00:00:00 2001
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From: Leonardo Bras <leobras@redhat.com>
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Date: Tue, 19 Jul 2022 09:23:45 -0300
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Subject: [PATCH 04/11] migration: Avoid false-positive on non-supported
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scenarios for zero-copy-send
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Leonardo Brás <leobras@redhat.com>
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RH-MergeRequest: 111: zero-copy-send fixes & improvements
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RH-Commit: [4/6] f5c7ed6710d92668acb81d0118a71fab0b4e3d43 (LeoBras/centos-qemu-kvm)
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RH-Bugzilla: 2107466
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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Migration with zero-copy-send currently has it's limitations, as it can't
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be used with TLS nor any kind of compression. In such scenarios, it should
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output errors during parameter / capability setting.
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But currently there are some ways of setting this not-supported scenarios
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without printing the error message:
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!) For 'compression' capability, it works by enabling it together with
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zero-copy-send. This happens because the validity test for zero-copy uses
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the helper unction migrate_use_compression(), which check for compression
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presence in s->enabled_capabilities[MIGRATION_CAPABILITY_COMPRESS].
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The point here is: the validity test happens before the capability gets
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enabled. If all of them get enabled together, this test will not return
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error.
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In order to fix that, replace migrate_use_compression() by directly testing
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the cap_list parameter migrate_caps_check().
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2) For features enabled by parameters such as TLS & 'multifd_compression',
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there was also a possibility of setting non-supported scenarios: setting
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zero-copy-send first, then setting the unsupported parameter.
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In order to fix that, also add a check for parameters conflicting with
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zero-copy-send on migrate_params_check().
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3) XBZRLE is also a compression capability, so it makes sense to also add
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it to the list of capabilities which are not supported with zero-copy-send.
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Fixes: 1abaec9a1b2c ("migration: Change zero_copy_send from migration parameter to migration capability")
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Signed-off-by: Leonardo Bras <leobras@redhat.com>
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Message-Id: <20220719122345.253713-1-leobras@redhat.com>
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Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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(cherry picked from commit 90eb69e4f1a16b388d0483543bf6bfc69a9966e4)
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Signed-off-by: Leonardo Bras <leobras@redhat.com>
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---
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migration/migration.c | 15 ++++++++++++++-
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1 file changed, 14 insertions(+), 1 deletion(-)
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diff --git a/migration/migration.c b/migration/migration.c
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index 3a3a7a4a50..343629d59c 100644
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--- a/migration/migration.c
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+++ b/migration/migration.c
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@@ -1265,7 +1265,9 @@ static bool migrate_caps_check(bool *cap_list,
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#ifdef CONFIG_LINUX
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if (cap_list[MIGRATION_CAPABILITY_ZERO_COPY_SEND] &&
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(!cap_list[MIGRATION_CAPABILITY_MULTIFD] ||
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- migrate_use_compression() ||
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+ cap_list[MIGRATION_CAPABILITY_COMPRESS] ||
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+ cap_list[MIGRATION_CAPABILITY_XBZRLE] ||
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+ migrate_multifd_compression() ||
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migrate_use_tls())) {
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error_setg(errp,
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"Zero copy only available for non-compressed non-TLS multifd migration");
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@@ -1502,6 +1504,17 @@ static bool migrate_params_check(MigrationParameters *params, Error **errp)
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error_prepend(errp, "Invalid mapping given for block-bitmap-mapping: ");
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return false;
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}
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+
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+#ifdef CONFIG_LINUX
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+ if (migrate_use_zero_copy_send() &&
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+ ((params->has_multifd_compression && params->multifd_compression) ||
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+ (params->has_tls_creds && params->tls_creds && *params->tls_creds))) {
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+ error_setg(errp,
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+ "Zero copy only available for non-compressed non-TLS multifd migration");
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+ return false;
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+ }
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+#endif
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+
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return true;
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}
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--
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2.31.1
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