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postcopy: Add extra check for COPY function 

As an extra sanity check, make sure the region we're registering
can perform UFFDIO_COPY;  the COPY will fail later but this
gives a cleaner failure.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Message-Id: <20170224182844.32452-17-dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert 2017-02-24 18:28:44 +00:00
parent 0c1f4036db
commit 665414ad06
1 changed files with 4 additions and 0 deletions
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4
migration/postcopy-ram.c
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@ -378,6 +378,10 @@ static int ram_block_enable_notify(const char *block_name, void *host_addr,
error_report("%s userfault register: %s", __func__, strerror(errno));
return -1;
}
if (!(reg_struct.ioctls & ((__u64)1 << _UFFDIO_COPY))) {
error_report("%s userfault: Region doesn't support COPY", __func__);
return -1;
}
return 0;
}