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migration: Add a new option to enable only-migratable

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Add a new option "--only-migratable" in qemu which will allow to add
only those devices which will not fail qemu after migration. Devices
set with the flag 'unmigratable' cannot be added when this option will
be used.

Signed-off-by: Ashijeet Acharya <ashijeetacharya@gmail.com>
Message-Id: <1484566314-3987-3-git-send-email-ashijeetacharya@gmail.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Ashijeet Acharya 2017-01-16 17:01:51 +05:30 committed by Dr. David Alan Gilbert
parent 05551e58ee
commit d15c05fc1f
3 changed files with 16 additions and 0 deletions
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3
include/migration/migration.h
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@ -38,6 +38,9 @@
#define QEMU_VM_COMMAND 0x08
#define QEMU_VM_SECTION_FOOTER 0x7e
/* for vl.c */
extern int only_migratable;
struct MigrationParams {
bool blk;
bool shared;

9
qemu-options.hx
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@ -3585,6 +3585,15 @@ be used to change settings (such as migration parameters) prior to issuing
the migrate_incoming to allow the migration to begin.
ETEXI
DEF("only-migratable", 0, QEMU_OPTION_only_migratable, \
"-only-migratable allow only migratable devices\n", QEMU_ARCH_ALL)
STEXI
@item -only-migratable
@findex -only-migratable
Only allow migratable devices. Devices will not be allowed to enter an
unmigratable state.
ETEXI
DEF("nodefaults", 0, QEMU_OPTION_nodefaults, \
"-nodefaults don't create default devices\n", QEMU_ARCH_ALL)
STEXI

4
vl.c
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@ -182,6 +182,7 @@ bool boot_strict;
uint8_t *boot_splash_filedata;
size_t boot_splash_filedata_size;
uint8_t qemu_extra_params_fw[2];
int only_migratable; /* turn it off unless user states otherwise */
int icount_align_option;
@ -3884,6 +3885,9 @@ int main(int argc, char **argv, char **envp)
}
incoming = optarg;
break;
case QEMU_OPTION_only_migratable:
only_migratable = 1;
break;
case QEMU_OPTION_nodefaults:
has_defaults = 0;
break;