* Richard Henderson: > On 5/13/22 03:00, Florian Weimer wrote: >> What's QEMU's approach to emulating CPU instructions that atomatically >> operate on values larger than what is supported by the host CPU? >> I assume that for full system emulation, this is not a problem, but >> qemu-user will not achieve atomic behavior on shared memory mappings. >> How much of a problem is this in practice? > > Well, it doesn't work, no. In practice, x86_64 supports 128-bit > atomic operations, and guest requires more than that. No one really > cares anymore about 32-bit hosts with smaller atomic operations.
Which part doesn't work? Full-system emulation? Do guests really require wider-than-128 atomics? That's quite surprising? Thanks, Florian
