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7ad4723976
All callers of vhost_get_avail_idx() use smp_rmb() to order the available ring entry read and avail_idx read. Make vhost_get_avail_idx() call smp_rmb() itself whenever the avail_idx is accessed. This way, the callers don't need to worry about the memory barrier. As a side benefit, we also validate the index on all paths now, which will hopefully help prevent/catch earlier future bugs. Note that current code is inconsistent in how the errors are handled. They are treated as an empty ring in some places, but as non-empty ring in other places. This patch doesn't attempt to change the existing behaviour. No functional change intended. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Gavin Shan <gshan@redhat.com> Acked-by: Will Deacon <will@kernel.org> Message-Id: <20240429232748.642356-1-gshan@redhat.com>
2992 lines
70 KiB
2992 lines
70 KiB