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.
r~
