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migration: Add mapped-ram URI compatibility check

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The mapped-ram migration format needs a channel that supports seeking
to be able to write each page to an arbitrary offset in the migration
stream.

Reviewed-by: "Daniel P. Berrangé" <berrange@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>
Link: https://lore.kernel.org/r/20240229153017.2221-9-farosas@suse.de
Signed-off-by: Peter Xu <peterx@redhat.com>
This commit is contained in:
Fabiano Rosas 2024-02-29 12:30:02 -03:00 committed by Peter Xu
parent 4ed49feb44
commit 8d9e0d4100
1 changed files with 29 additions and 0 deletions
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29
migration/migration.c
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@ -148,10 +148,39 @@ static bool transport_supports_multi_channels(MigrationAddress *addr)
return false;
}
static bool migration_needs_seekable_channel(void)
{
return migrate_mapped_ram();
}
static bool transport_supports_seeking(MigrationAddress *addr)
{
if (addr->transport == MIGRATION_ADDRESS_TYPE_FILE) {
return true;
}
/*
* At this point, the user might not yet have passed the file
* descriptor to QEMU, so we cannot know for sure whether it
* refers to a plain file or a socket. Let it through anyway.
*/
if (addr->transport == MIGRATION_ADDRESS_TYPE_SOCKET) {
return addr->u.socket.type == SOCKET_ADDRESS_TYPE_FD;
}
return false;
}
static bool
migration_channels_and_transport_compatible(MigrationAddress *addr,
Error **errp)
{
if (migration_needs_seekable_channel() &&
!transport_supports_seeking(addr)) {
error_setg(errp, "Migration requires seekable transport (e.g. file)");
return false;
}
if (migration_needs_multiple_sockets() &&
!transport_supports_multi_channels(addr)) {
error_setg(errp, "Migration requires multi-channel URIs (e.g. tcp)");