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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>
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@ -378,6 +378,10 @@ static int ram_block_enable_notify(const char *block_name, void *host_addr,
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error_report("%s userfault register: %s", __func__, strerror(errno));
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error_report("%s userfault register: %s", __func__, strerror(errno));
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return -1;
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return -1;
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}
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}
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if (!(reg_struct.ioctls & ((__u64)1 << _UFFDIO_COPY))) {
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error_report("%s userfault: Region doesn't support COPY", __func__);
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return -1;
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}
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return 0;
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return 0;
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}
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}
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