On Tue, Mar 08, 2022, Paolo Bonzini wrote: > On 3/3/22 20:38, Paolo Bonzini wrote: > > On x86, perform two passes with a MMU context reset between each pass to > > coerce KVM into dropping all references to the MMU root, e.g. to emulate > > a vCPU dropping the last reference. Perform both passes and all > > rendezvous on all architectures in the hope that arm64 and s390x can gain > > similar shenanigans in the future. > > Did you actually test aarch64 (not even asking about s390 :))? For now > let's only add it for x86. Nope, don't you read my cover letters? :-D The selftest at the end allows populating a guest with the max amount of memory allowed by the underlying architecture. The most I've tested is ~64tb (MAXPHYADDR=46) as I don't have easy access to a system with MAXPHYADDR=52. The selftest compiles on arm64 and s390x, but otherwise hasn't been tested outside of x86-64. It will hopefully do something useful as is, but there's a non-zero chance it won't get past init with a high max memory. Running on x86 without the TDP MMU is comically slow. > > + TEST_ASSERT(nr_vcpus, "#DE"); > > srsly? :) LOL, yes. IIRC I added that because I screwed up computing nr_vcpus and my test did nothing useful :-)
