On 01/09/2012 04:17 PM, Alexander Graf wrote: > > On 09.01.2012, at 22:48, Scott Wood wrote: > >> On 01/09/2012 11:48 AM, Alexander Graf wrote: >>> >>> Do you think it's possible to combine this with the book3s_pr code, so we >>> don't duplicate too much here? >> >> book3s_pr is a bit different in that it can trap when the guest sets >> MSR[FP]. > > Ah, there's no doorbell? So you always have to swap fpu registers? You still > have to enable it manually when preempting in, right? IIRC ppc32 does lazy > fpu activation.
Right. Preempting in is handled by calling kvmppc_load_guest_fp() (which should be renamed to be booke-specific, since the semantics are tied to booke.c) from kvmppc_core_vcpu_load() in e500mc.c. >>> I'm having a hard time to grasp when shared->msr, shadow_msr and regs->msr >>> is used in your code :). >> >> shadow_msr is the real MSR. >> >> shared->msr is the guest's view of MSR. Correction -- this applies to PR-mode (e500v2). In GS-mode, shadow_msr is not used. The guest sees the real MSR (hw silently prevents it from modifying certain bits), which gets saved on exit into shared->msr. -Scott -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
