On 29/02/2016 14:21, Peter Maydell wrote: > On 29 February 2016 at 13:16, Alvise Rigo <a.r...@virtualopensystems.com> > wrote: >> > As in the case of tlb_flush(), also tlb_flush_by_mmuidx has to query the >> > TLB flush if it targets another VCPU. To accomplish this, a new async >> > work has been added, together with a new TLBFlushByMMUIdxParams. A >> > bitmap is used to track the MMU indexes to flush. >> > >> > This patch applies to the multi_tcg_v8 branch. > What's the API for a target CPU emulation to say "and now I must > wait for the TLB op to finish" before completing this guest > instruction?
My proposal has been for a while for DMB to put the CPU in a halted state (remote TLB callbacks then can decrement a counter and signal cpu_halt_cond when it's zero), but no one has implemented this. Paolo
