Commit 665414ad authored by Dr. David Alan Gilbert's avatar Dr. David Alan Gilbert
Browse files

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: default avatarDr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: default avatarLaurent Vivier <lvivier@redhat.com>
Message-Id: <20170224182844.32452-17-dgilbert@redhat.com>
Signed-off-by: default avatarDr. David Alan Gilbert <dgilbert@redhat.com>
parent 0c1f4036

migration/postcopy-ram.c

+4 −0
Original line number Diff line number Diff line
@@ -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;

}