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Subject: [OASIS Issue Tracker] Created: (VIRTIO-35) race condition with multi-dword config accesses
race condition with multi-dword config accesses ----------------------------------------------- Key: VIRTIO-35 URL: http://tools.oasis-open.org/issues/browse/VIRTIO-35 Project: OASIS Virtual I/O Device (VIRTIO) TC Issue Type: Bug Reporter: Michael Tsirkin on many architectures, accesses larger than 32 bit can not be atomic. Thus access to a device config field of >4 bytes is inherently racy in case field can change. For example, virtio-blk has u64 capacity; The following race can trigger: driver reads low 32 bit both low and high 32 bit change driver reads high 32 bit as a result, capacity observed is composed of old low bits and new high bits which does not make sense. For legacy devices, spec allowed byte by byte access, making the race even more common. -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://tools.oasis-open.org/issues/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira
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