From: Fabiano Rosas <farosas@suse.de>
To: Steve Sistare <steven.sistare@oracle.com>, qemu-devel@nongnu.org
Cc: Peter Xu <peterx@redhat.com>,
David Hildenbrand <david@redhat.com>,
Igor Mammedov <imammedo@redhat.com>,
Eduardo Habkost <eduardo@habkost.net>,
Marcel Apfelbaum <marcel.apfelbaum@gmail.com>,
Philippe Mathieu-Daude <philmd@linaro.org>,
Paolo Bonzini <pbonzini@redhat.com>,
"Daniel P. Berrange" <berrange@redhat.com>,
Markus Armbruster <armbru@redhat.com>,
Steve Sistare <steven.sistare@oracle.com>
Subject: Re: [PATCH V1 26/26] migration: only-migratable-modes
Date: Thu, 09 May 2024 16:14:53 -0300 [thread overview]
Message-ID: <87ikzmkdaq.fsf@suse.de> (raw)
In-Reply-To: <1714406135-451286-27-git-send-email-steven.sistare@oracle.com>
Steve Sistare <steven.sistare@oracle.com> writes:
> Add the only-migratable-modes option as a generalization of only-migratable.
> Only devices that support all requested modes are allowed.
>
> Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
> ---
> include/migration/misc.h | 3 +++
> include/sysemu/sysemu.h | 1 -
> migration/migration-hmp-cmds.c | 26 +++++++++++++++++++++++++-
> migration/migration.c | 22 +++++++++++++++++-----
> migration/savevm.c | 2 +-
> qemu-options.hx | 16 ++++++++++++++--
> system/globals.c | 1 -
> system/vl.c | 13 ++++++++++++-
> target/s390x/cpu_models.c | 4 +++-
> 9 files changed, 75 insertions(+), 13 deletions(-)
>
> diff --git a/include/migration/misc.h b/include/migration/misc.h
> index 5b963ba..3ad2cd9 100644
> --- a/include/migration/misc.h
> +++ b/include/migration/misc.h
> @@ -119,6 +119,9 @@ bool migration_incoming_postcopy_advised(void);
> /* True if background snapshot is active */
> bool migration_in_bg_snapshot(void);
>
> +void migration_set_required_mode(MigMode mode);
> +bool migration_mode_required(MigMode mode);
> +
> /* migration/block-dirty-bitmap.c */
> void dirty_bitmap_mig_init(void);
>
> diff --git a/include/sysemu/sysemu.h b/include/sysemu/sysemu.h
> index 5b4397e..0a9c4b4 100644
> --- a/include/sysemu/sysemu.h
> +++ b/include/sysemu/sysemu.h
> @@ -8,7 +8,6 @@
>
> /* vl.c */
>
> -extern int only_migratable;
> extern const char *qemu_name;
> extern QemuUUID qemu_uuid;
> extern bool qemu_uuid_set;
> diff --git a/migration/migration-hmp-cmds.c b/migration/migration-hmp-cmds.c
> index 414c7e8..ca913b7 100644
> --- a/migration/migration-hmp-cmds.c
> +++ b/migration/migration-hmp-cmds.c
> @@ -16,6 +16,7 @@
> #include "qemu/osdep.h"
> #include "block/qapi.h"
> #include "migration/snapshot.h"
> +#include "migration/misc.h"
> #include "monitor/hmp.h"
> #include "monitor/monitor.h"
> #include "qapi/error.h"
> @@ -33,6 +34,28 @@
> #include "options.h"
> #include "migration.h"
>
> +static void migration_dump_modes(Monitor *mon)
> +{
> + int mode, n = 0;
> +
> + monitor_printf(mon, "only-migratable-modes: ");
> +
> + for (mode = 0; mode < MIG_MODE__MAX; mode++) {
> + if (migration_mode_required(mode)) {
> + if (n++) {
> + monitor_printf(mon, ",");
> + }
> + monitor_printf(mon, "%s", MigMode_str(mode));
> + }
> + }
> +
> + if (!n) {
> + monitor_printf(mon, "none\n");
> + } else {
> + monitor_printf(mon, "\n");
> + }
> +}
> +
> static void migration_global_dump(Monitor *mon)
> {
> MigrationState *ms = migrate_get_current();
> @@ -41,7 +64,7 @@ static void migration_global_dump(Monitor *mon)
> monitor_printf(mon, "store-global-state: %s\n",
> ms->store_global_state ? "on" : "off");
> monitor_printf(mon, "only-migratable: %s\n",
> - only_migratable ? "on" : "off");
> + migration_mode_required(MIG_MODE_NORMAL) ? "on" : "off");
> monitor_printf(mon, "send-configuration: %s\n",
> ms->send_configuration ? "on" : "off");
> monitor_printf(mon, "send-section-footer: %s\n",
> @@ -50,6 +73,7 @@ static void migration_global_dump(Monitor *mon)
> ms->decompress_error_check ? "on" : "off");
> monitor_printf(mon, "clear-bitmap-shift: %u\n",
> ms->clear_bitmap_shift);
> + migration_dump_modes(mon);
> }
>
> void hmp_info_migrate(Monitor *mon, const QDict *qdict)
> diff --git a/migration/migration.c b/migration/migration.c
> index 4984dee..5535b84 100644
> --- a/migration/migration.c
> +++ b/migration/migration.c
> @@ -1719,17 +1719,29 @@ static bool is_busy(Error **reasonp, Error **errp)
> return false;
> }
>
> -static bool is_only_migratable(Error **reasonp, Error **errp, int modes)
> +static int migration_modes_required;
> +
> +void migration_set_required_mode(MigMode mode)
> +{
> + migration_modes_required |= BIT(mode);
> +}
> +
> +bool migration_mode_required(MigMode mode)
> +{
> + return !!(migration_modes_required & BIT(mode));
> +}
> +
> +static bool modes_are_required(Error **reasonp, Error **errp, int modes)
> {
> ERRP_GUARD();
>
> - if (only_migratable && (modes & BIT(MIG_MODE_NORMAL))) {
> + if (migration_modes_required & modes) {
> error_propagate_prepend(errp, *reasonp,
> - "disallowing migration blocker "
> - "(--only-migratable) for: ");
> + "-only-migratable{-modes} specified, but: ");
extra space before 'specified'
> *reasonp = NULL;
> return true;
> }
> +
> return false;
> }
>
> @@ -1783,7 +1795,7 @@ int migrate_add_blocker_modes(Error **reasonp, Error **errp, MigMode mode, ...)
> modes = get_modes(mode, ap);
> va_end(ap);
>
> - if (is_only_migratable(reasonp, errp, modes)) {
> + if (modes_are_required(reasonp, errp, modes)) {
> return -EACCES;
> } else if (is_busy(reasonp, errp)) {
> return -EBUSY;
> diff --git a/migration/savevm.c b/migration/savevm.c
> index 6087c3a..e53ac84 100644
> --- a/migration/savevm.c
> +++ b/migration/savevm.c
> @@ -3585,7 +3585,7 @@ void vmstate_register_ram_global(MemoryRegion *mr)
> bool vmstate_check_only_migratable(const VMStateDescription *vmsd)
> {
> /* check needed if --only-migratable is specified */
> - if (!only_migratable) {
> + if (!migration_mode_required(MIG_MODE_NORMAL)) {
> return true;
> }
>
> diff --git a/qemu-options.hx b/qemu-options.hx
> index f0dfda5..946d731 100644
> --- a/qemu-options.hx
> +++ b/qemu-options.hx
> @@ -4807,8 +4807,20 @@ DEF("only-migratable", 0, QEMU_OPTION_only_migratable, \
> "-only-migratable allow only migratable devices\n", QEMU_ARCH_ALL)
> SRST
> ``-only-migratable``
> - Only allow migratable devices. Devices will not be allowed to enter
> - an unmigratable state.
> + Only allow devices that can migrate using normal mode. Devices will not
> + be allowed to enter an unmigratable state.
What's a "normal" mode is what people will ask. I don't think we need to
expose this. This option never had anything to do with "modes" and I
think we can keep it this way. See below...
> +ERST
> +
> +DEF("only-migratable-modes", HAS_ARG, QEMU_OPTION_only_migratable_modes, \
> + "-only-migratable-modes mode1[,...]\n"
> + " allow only devices that are migratable using mode(s)\n",
> + QEMU_ARCH_ALL)
> +SRST
> +``-only-migratable-modes mode1[,...]``
> + Only allow devices which are migratable using all modes in the list,
> + which guarantees that migration will not fail due to a blocker.
> + If both only-migratable-modes and only-migratable are specified,
> + or are specified multiple times, then the required modes accumulate.
> ERST
>
> DEF("nodefaults", 0, QEMU_OPTION_nodefaults, \
> diff --git a/system/globals.c b/system/globals.c
> index e353584..fdc263e 100644
> --- a/system/globals.c
> +++ b/system/globals.c
> @@ -48,7 +48,6 @@ const char *qemu_name;
> unsigned int nb_prom_envs;
> const char *prom_envs[MAX_PROM_ENVS];
> uint8_t *boot_splash_filedata;
> -int only_migratable; /* turn it off unless user states otherwise */
> int icount_align_option;
>
> /* The bytes in qemu_uuid are in the order specified by RFC4122, _not_ in the
> diff --git a/system/vl.c b/system/vl.c
> index b76881e..7e73be9 100644
> --- a/system/vl.c
> +++ b/system/vl.c
> @@ -3458,7 +3458,18 @@ void qemu_init(int argc, char **argv)
> incoming = optarg;
> break;
> case QEMU_OPTION_only_migratable:
> - only_migratable = 1;
> + migration_set_required_mode(MIG_MODE_NORMAL);
...from the point of view of user intent, I think this should be
MIG_MODE_ALL. If I have this option set I never want to see a blocker,
period. That's not a change in behavior because the mode has to be
explicitly selected anyway.
> + break;
> + case QEMU_OPTION_only_migratable_modes:
> + {
> + int i, mode;
> + g_autofree char **words = g_strsplit(optarg, ",", -1);
> + for (i = 0; words[i]; i++) {
> + mode = qapi_enum_parse(&MigMode_lookup, words[i], -1,
> + &error_fatal);
> + migration_set_required_mode(mode);
This option can be used to refine the modes being considered, it should
take precedence if both are present.
> + }
> + }
> break;
> case QEMU_OPTION_nodefaults:
> has_defaults = 0;
> diff --git a/target/s390x/cpu_models.c b/target/s390x/cpu_models.c
> index 8ed3bb6..42ad160 100644
> --- a/target/s390x/cpu_models.c
> +++ b/target/s390x/cpu_models.c
> @@ -16,6 +16,7 @@
> #include "kvm/kvm_s390x.h"
> #include "sysemu/kvm.h"
> #include "sysemu/tcg.h"
> +#include "migration/misc.h"
> #include "qapi/error.h"
> #include "qemu/error-report.h"
> #include "qapi/visitor.h"
> @@ -526,7 +527,8 @@ static void check_compatibility(const S390CPUModel *max_model,
> }
>
> #ifndef CONFIG_USER_ONLY
> - if (only_migratable && test_bit(S390_FEAT_UNPACK, model->features)) {
> + if (migration_mode_required(MIG_MODE_NORMAL) &&
> + test_bit(S390_FEAT_UNPACK, model->features)) {
> error_setg(errp, "The unpack facility is not compatible with "
> "the --only-migratable option. You must remove either "
> "the 'unpack' facility or the --only-migratable option");
next prev parent reply other threads:[~2024-05-09 19:15 UTC|newest]
Thread overview: 122+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-29 15:55 [PATCH V1 00/26] Live update: cpr-exec Steve Sistare
2024-04-29 15:55 ` [PATCH V1 01/26] oslib: qemu_clear_cloexec Steve Sistare
2024-05-06 23:27 ` Fabiano Rosas
2024-05-07 8:56 ` Daniel P. Berrangé
2024-05-07 13:54 ` Fabiano Rosas
2024-04-29 15:55 ` [PATCH V1 02/26] vl: helper to request re-exec Steve Sistare
2024-04-29 15:55 ` [PATCH V1 03/26] migration: SAVEVM_FOREACH Steve Sistare
2024-05-06 23:17 ` Fabiano Rosas
2024-05-13 19:27 ` Steven Sistare
2024-05-27 18:14 ` Peter Xu
2024-04-29 15:55 ` [PATCH V1 04/26] migration: delete unused parameter mis Steve Sistare
2024-05-06 21:50 ` Fabiano Rosas
2024-05-27 18:02 ` Peter Xu
2024-04-29 15:55 ` [PATCH V1 05/26] migration: precreate vmstate Steve Sistare
2024-05-07 21:02 ` Fabiano Rosas
2024-05-13 19:28 ` Steven Sistare
2024-05-24 13:56 ` Fabiano Rosas
2024-05-27 18:16 ` Peter Xu
2024-05-28 15:09 ` Steven Sistare via
2024-05-29 18:39 ` Peter Xu
2024-05-30 17:04 ` Steven Sistare via
2024-04-29 15:55 ` [PATCH V1 06/26] migration: precreate vmstate for exec Steve Sistare
2024-05-06 23:34 ` Fabiano Rosas
2024-05-13 19:28 ` Steven Sistare
2024-05-13 21:21 ` Fabiano Rosas
2024-04-29 15:55 ` [PATCH V1 07/26] migration: VMStateId Steve Sistare
2024-05-07 21:03 ` Fabiano Rosas
2024-05-27 18:20 ` Peter Xu
2024-05-28 15:10 ` Steven Sistare via
2024-05-28 17:44 ` Peter Xu
2024-05-29 17:30 ` Steven Sistare via
2024-05-29 18:53 ` Peter Xu
2024-05-30 17:11 ` Steven Sistare via
2024-05-30 18:03 ` Peter Xu
2024-04-29 15:55 ` [PATCH V1 08/26] migration: vmstate_info_void_ptr Steve Sistare
2024-05-07 21:33 ` Fabiano Rosas
2024-05-27 18:31 ` Peter Xu
2024-05-28 15:10 ` Steven Sistare via
2024-05-28 18:21 ` Peter Xu
2024-05-29 17:30 ` Steven Sistare via
2024-04-29 15:55 ` [PATCH V1 09/26] migration: vmstate_register_named Steve Sistare
2024-05-09 14:19 ` Fabiano Rosas
2024-05-09 14:32 ` Fabiano Rosas
2024-05-13 19:29 ` Steven Sistare
2024-04-29 15:55 ` [PATCH V1 10/26] migration: vmstate_unregister_named Steve Sistare
2024-04-29 15:55 ` [PATCH V1 11/26] migration: vmstate_register at init time Steve Sistare
2024-04-29 15:55 ` [PATCH V1 12/26] migration: vmstate factory object Steve Sistare
2024-04-29 15:55 ` [PATCH V1 13/26] physmem: ram_block_create Steve Sistare
2024-05-13 18:37 ` Fabiano Rosas
2024-05-13 19:30 ` Steven Sistare
2024-04-29 15:55 ` [PATCH V1 14/26] physmem: hoist guest_memfd creation Steve Sistare
2024-04-29 15:55 ` [PATCH V1 15/26] physmem: hoist host memory allocation Steve Sistare
2024-04-29 15:55 ` [PATCH V1 16/26] physmem: set ram block idstr earlier Steve Sistare
2024-04-29 15:55 ` [PATCH V1 17/26] machine: memfd-alloc option Steve Sistare
2024-05-28 21:12 ` Peter Xu
2024-05-29 17:31 ` Steven Sistare via
2024-05-29 19:14 ` Peter Xu
2024-05-30 17:11 ` Steven Sistare via
2024-05-30 18:14 ` Peter Xu
2024-05-31 19:32 ` Steven Sistare via
2024-06-03 21:48 ` Peter Xu
2024-06-04 7:13 ` Daniel P. Berrangé
2024-06-04 15:58 ` Peter Xu
2024-06-04 16:14 ` David Hildenbrand
2024-06-04 16:41 ` Peter Xu
2024-06-04 17:16 ` David Hildenbrand
2024-06-03 10:17 ` Daniel P. Berrangé
2024-06-03 11:59 ` Steven Sistare via
2024-04-29 15:55 ` [PATCH V1 18/26] migration: cpr-exec-args parameter Steve Sistare
2024-05-02 12:23 ` Markus Armbruster
2024-05-02 16:00 ` Steven Sistare
2024-05-21 8:13 ` Daniel P. Berrangé
2024-04-29 15:55 ` [PATCH V1 19/26] physmem: preserve ram blocks for cpr Steve Sistare
2024-05-28 21:44 ` Peter Xu
2024-05-29 17:31 ` Steven Sistare via
2024-05-29 19:25 ` Peter Xu
2024-05-30 17:12 ` Steven Sistare via
2024-05-30 18:39 ` Peter Xu
2024-05-31 19:32 ` Steven Sistare via
2024-06-03 22:29 ` Peter Xu
2024-04-29 15:55 ` [PATCH V1 20/26] migration: cpr-exec mode Steve Sistare
2024-05-02 12:23 ` Markus Armbruster
2024-05-02 16:00 ` Steven Sistare
2024-05-03 6:26 ` Markus Armbruster
2024-05-21 8:20 ` Daniel P. Berrangé
2024-05-24 14:58 ` Fabiano Rosas
2024-05-27 18:54 ` Steven Sistare via
2024-04-29 15:55 ` [PATCH V1 21/26] migration: migrate_add_blocker_mode Steve Sistare
2024-05-09 17:47 ` Fabiano Rosas
2024-04-29 15:55 ` [PATCH V1 22/26] migration: ram block cpr-exec blockers Steve Sistare
2024-05-09 18:01 ` Fabiano Rosas
2024-05-13 19:29 ` Steven Sistare
2024-04-29 15:55 ` [PATCH V1 23/26] migration: misc " Steve Sistare
2024-05-09 18:05 ` Fabiano Rosas
2024-05-24 12:40 ` Fabiano Rosas
2024-05-27 19:02 ` Steven Sistare via
2024-04-29 15:55 ` [PATCH V1 24/26] seccomp: cpr-exec blocker Steve Sistare
2024-05-09 18:16 ` Fabiano Rosas
2024-05-10 7:54 ` Daniel P. Berrangé
2024-05-13 19:29 ` Steven Sistare
2024-05-21 7:14 ` Daniel P. Berrangé
2024-04-29 15:55 ` [PATCH V1 25/26] migration: fix mismatched GPAs during cpr-exec Steve Sistare
2024-05-09 18:39 ` Fabiano Rosas
2024-04-29 15:55 ` [PATCH V1 26/26] migration: only-migratable-modes Steve Sistare
2024-05-09 19:14 ` Fabiano Rosas [this message]
2024-05-13 19:48 ` Steven Sistare
2024-05-13 21:57 ` Fabiano Rosas
2024-05-21 8:05 ` Daniel P. Berrangé
2024-05-02 16:13 ` cpr-exec doc (was Re: [PATCH V1 00/26] Live update: cpr-exec) Steven Sistare
2024-05-02 18:15 ` Peter Xu
2024-05-20 18:30 ` [PATCH V1 00/26] Live update: cpr-exec Steven Sistare
2024-05-20 22:28 ` Fabiano Rosas
2024-05-21 2:31 ` Peter Xu
2024-05-21 11:46 ` Steven Sistare
2024-05-27 17:45 ` Peter Xu
2024-05-28 15:10 ` Steven Sistare via
2024-05-28 16:42 ` Peter Xu
2024-05-30 17:17 ` Steven Sistare via
2024-05-30 19:23 ` Peter Xu
2024-05-24 13:02 ` Fabiano Rosas
2024-05-24 14:07 ` Steven Sistare
2024-05-27 18:07 ` Peter Xu
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=87ikzmkdaq.fsf@suse.de \
--to=farosas@suse.de \
--cc=armbru@redhat.com \
--cc=berrange@redhat.com \
--cc=david@redhat.com \
--cc=eduardo@habkost.net \
--cc=imammedo@redhat.com \
--cc=marcel.apfelbaum@gmail.com \
--cc=pbonzini@redhat.com \
--cc=peterx@redhat.com \
--cc=philmd@linaro.org \
--cc=qemu-devel@nongnu.org \
--cc=steven.sistare@oracle.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).