From 70c25c92e602f393d3c33596530c5f2b18491e55 Mon Sep 17 00:00:00 2001 From: Hao Xiang Date: Mon, 11 Mar 2024 18:00:14 +0000 Subject: [PATCH] migration/multifd: Enable multifd zero page checking by default. 1. Set default "zero-page-detection" option to "multifd". Now zero page checking can be done in the multifd threads and this becomes the default configuration. 2. Handle migration QEMU9.0 -> QEMU8.2 compatibility. We provide backward compatibility where zero page checking is done from the migration main thread. Signed-off-by: Hao Xiang Reviewed-by: Fabiano Rosas Reviewed-by: Peter Xu Link: https://lore.kernel.org/r/20240311180015.3359271-7-hao.xiang@linux.dev Signed-off-by: Peter Xu --- hw/core/machine.c | 4 +++- migration/options.c | 2 +- qapi/migration.json | 6 +++--- 3 files changed, 7 insertions(+), 5 deletions(-) diff --git a/hw/core/machine.c b/hw/core/machine.c index 9ac5d5389a..0e9d646b61 100644 --- a/hw/core/machine.c +++ b/hw/core/machine.c @@ -32,7 +32,9 @@ #include "hw/virtio/virtio-net.h" #include "audio/audio.h" -GlobalProperty hw_compat_8_2[] = {}; +GlobalProperty hw_compat_8_2[] = { + { "migration", "zero-page-detection", "legacy"}, +}; const size_t hw_compat_8_2_len = G_N_ELEMENTS(hw_compat_8_2); GlobalProperty hw_compat_8_1[] = { diff --git a/migration/options.c b/migration/options.c index 8f2a3a2fa5..9ed2fe4bee 100644 --- a/migration/options.c +++ b/migration/options.c @@ -181,7 +181,7 @@ Property migration_properties[] = { MIG_MODE_NORMAL), DEFINE_PROP_ZERO_PAGE_DETECTION("zero-page-detection", MigrationState, parameters.zero_page_detection, - ZERO_PAGE_DETECTION_LEGACY), + ZERO_PAGE_DETECTION_MULTIFD), /* Migration capabilities */ DEFINE_PROP_MIG_CAP("x-xbzrle", MIGRATION_CAPABILITY_XBZRLE), diff --git a/qapi/migration.json b/qapi/migration.json index 2684e4e9ac..aa1b39bce1 100644 --- a/qapi/migration.json +++ b/qapi/migration.json @@ -909,7 +909,7 @@ # (Since 8.2) # # @zero-page-detection: Whether and how to detect zero pages. -# See description in @ZeroPageDetection. Default is 'legacy'. +# See description in @ZeroPageDetection. Default is 'multifd'. # (since 9.0) # # Features: @@ -1106,7 +1106,7 @@ # (Since 8.2) # # @zero-page-detection: Whether and how to detect zero pages. -# See description in @ZeroPageDetection. Default is 'legacy'. +# See description in @ZeroPageDetection. Default is 'multifd'. # (since 9.0) # # Features: @@ -1339,7 +1339,7 @@ # (Since 8.2) # # @zero-page-detection: Whether and how to detect zero pages. -# See description in @ZeroPageDetection. Default is 'legacy'. +# See description in @ZeroPageDetection. Default is 'multifd'. # (since 9.0) # # Features: -- 2.39.5