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Andrzej Zaborowski
4dedc07ffb
Janne Huttunen noticed that the FIFO end pointer is updated by the guest after writing each word to the FIFO, at least the X.org driver which is open does this. This means that there's no way for the host to know if the guest is in the middle a write operation. Qemu thus needs to read the beginning of the command up to when it's able to tell how many words are expected for the given command. It will abort reading and rewind the FIFO if there aren't enough words yet, this should be relatively rare but it is suspected to have been the cause of the occasional FIFO overrun that killed the display.
Read the documentation in qemu-doc.html. Fabrice Bellard.