From 1abaec9a1b2c23f7aa94709a422128d9e42c3e0b Mon Sep 17 00:00:00 2001 From: Leonardo Bras Date: Mon, 20 Jun 2022 02:39:45 -0300 Subject: migration: Change zero_copy_send from migration parameter to migration capability When originally implemented, zero_copy_send was designed as a Migration paramenter. But taking into account how is that supposed to work, and how the difference between a capability and a parameter, it only makes sense that zero-copy-send would work better as a capability. Taking into account how recently the change got merged, it was decided that it's still time to make it right, and convert zero_copy_send into a Migration capability. Signed-off-by: Leonardo Bras Reviewed-by: Juan Quintela Acked-by: Markus Armbruster Acked-by: Peter Xu Signed-off-by: Juan Quintela Signed-off-by: Dr. David Alan Gilbert dgilbert: always define the capability, even on non-Linux but error if set; avoids build problems with the capability --- qapi/migration.json | 33 +++++++++------------------------ 1 file changed, 9 insertions(+), 24 deletions(-) (limited to 'qapi') diff --git a/qapi/migration.json b/qapi/migration.json index 6130cd9..7102e47 100644 --- a/qapi/migration.json +++ b/qapi/migration.json @@ -461,6 +461,13 @@ # procedure starts. The VM RAM is saved with running VM. # (since 6.0) # +# @zero-copy-send: Controls behavior on sending memory pages on migration. +# When true, enables a zero-copy mechanism for sending +# memory pages, if host supports it. +# Requires that QEMU be permitted to use locked memory +# for guest RAM pages. +# (since 7.1) +# # Features: # @unstable: Members @x-colo and @x-ignore-shared are experimental. # @@ -474,7 +481,8 @@ 'block', 'return-path', 'pause-before-switchover', 'multifd', 'dirty-bitmaps', 'postcopy-blocktime', 'late-block-activate', { 'name': 'x-ignore-shared', 'features': [ 'unstable' ] }, - 'validate-uuid', 'background-snapshot'] } + 'validate-uuid', 'background-snapshot', + 'zero-copy-send'] } ## # @MigrationCapabilityStatus: @@ -738,12 +746,6 @@ # will consume more CPU. # Defaults to 1. (Since 5.0) # -# @zero-copy-send: Controls behavior on sending memory pages on migration. -# When true, enables a zero-copy mechanism for sending -# memory pages, if host supports it. -# Requires that QEMU be permitted to use locked memory -# for guest RAM pages. -# Defaults to false. (Since 7.1) # # @block-bitmap-mapping: Maps block nodes and bitmaps on them to # aliases for the purpose of dirty bitmap migration. Such @@ -784,7 +786,6 @@ 'xbzrle-cache-size', 'max-postcopy-bandwidth', 'max-cpu-throttle', 'multifd-compression', 'multifd-zlib-level' ,'multifd-zstd-level', - { 'name': 'zero-copy-send', 'if' : 'CONFIG_LINUX'}, 'block-bitmap-mapping' ] } ## @@ -911,13 +912,6 @@ # will consume more CPU. # Defaults to 1. (Since 5.0) # -# @zero-copy-send: Controls behavior on sending memory pages on migration. -# When true, enables a zero-copy mechanism for sending -# memory pages, if host supports it. -# Requires that QEMU be permitted to use locked memory -# for guest RAM pages. -# Defaults to false. (Since 7.1) -# # @block-bitmap-mapping: Maps block nodes and bitmaps on them to # aliases for the purpose of dirty bitmap migration. Such # aliases may for example be the corresponding names on the @@ -972,7 +966,6 @@ '*multifd-compression': 'MultiFDCompression', '*multifd-zlib-level': 'uint8', '*multifd-zstd-level': 'uint8', - '*zero-copy-send': { 'type': 'bool', 'if': 'CONFIG_LINUX' }, '*block-bitmap-mapping': [ 'BitmapMigrationNodeAlias' ] } } ## @@ -1119,13 +1112,6 @@ # will consume more CPU. # Defaults to 1. (Since 5.0) # -# @zero-copy-send: Controls behavior on sending memory pages on migration. -# When true, enables a zero-copy mechanism for sending -# memory pages, if host supports it. -# Requires that QEMU be permitted to use locked memory -# for guest RAM pages. -# Defaults to false. (Since 7.1) -# # @block-bitmap-mapping: Maps block nodes and bitmaps on them to # aliases for the purpose of dirty bitmap migration. Such # aliases may for example be the corresponding names on the @@ -1178,7 +1164,6 @@ '*multifd-compression': 'MultiFDCompression', '*multifd-zlib-level': 'uint8', '*multifd-zstd-level': 'uint8', - '*zero-copy-send': { 'type': 'bool', 'if': 'CONFIG_LINUX' }, '*block-bitmap-mapping': [ 'BitmapMigrationNodeAlias' ] } } ## -- cgit v1.1