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migration: detect compression and decompression errors

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Currently the page being compressed is allowed to be updated by
the VM on the source QEMU, correspondingly the destination QEMU
just ignores the decompression error. However, we completely miss
the chance to catch real errors, then the VM is corrupted silently

To make the migration more robuster, we copy the page to a buffer
first to avoid it being written by VM, then detect and handle the
errors of both compression and decompression errors properly

Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Xiao Guangrong <xiaoguangrong@tencent.com>
Message-Id: <20180330075128.26919-5-xiaoguangrong@tencent.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Xiao Guangrong 2018-03-30 15:51:22 +08:00 • committed by Dr. David Alan Gilbert
parent 797ca154b4
commit 34ab9e9743
2 changed files with 41 additions and 19 deletions
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4
migration/qemu-file.c
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@ -710,9 +710,9 @@ ssize_t qemu_put_compression_data(QEMUFile *f, z_stream *stream,
blen = qemu_compress_data(stream, f->buf + f->buf_index + sizeof(int32_t),
blen, p, size);
if (blen < 0) {
error_report("Compress Failed!");
return 0;
return -1;
}
qemu_put_be32(f, blen);
if (f->ops->writev_buffer) {
add_to_iovec(f, f->buf + f->buf_index, blen, false);