> From: Andrew Baumann > Sent: Friday, 13 October 2017 11:19 > > Aligned 8-byte memory writes by a 64-bit target on a 64-bit host should > always turn into atomic 8-byte writes on the host, however if we missed > in the softmmu, and the TLB line was marked as not dirty, then we > would end up tearing the 8-byte write into two 4-byte writes in > access_with_adjusted_size(). > > Signed-off-by: Andrew Baumann <andrew.baum...@microsoft.com> > --- > This manifested as a race in lock-free synchronisation with an aarch64 > Windows guest on an x86-64 host (with multithreaded TCG). > > exec.c | 13 +++++++++++++ > 1 file changed, 13 insertions(+)
By the way, I noticed that watch_mem_ops are also 4-byte only. I suspect the same fix may be needed there? Andrew
