> -----Original Message----- > From: kvm-ppc-ow...@vger.kernel.org [mailto:kvm-ppc- > ow...@vger.kernel.org] On Behalf Of Alexander Graf > Sent: Wednesday, July 03, 2013 9:40 PM > To: Wood Scott-B07421 > Cc: Caraman Mihai Claudiu-B02008; kvm-...@vger.kernel.org; > k...@vger.kernel.org; linuxppc-dev@lists.ozlabs.org > Subject: Re: [PATCH 3/6] KVM: PPC: Book3E: Increase FPU laziness > > > On 03.07.2013, at 20:37, Scott Wood wrote: > > > On 07/03/2013 07:42:36 AM, Mihai Caraman wrote: > >> Increase FPU laziness by calling kvmppc_load_guest_fp() just before > >> returning to guest instead of each sched in. Without this improvement > >> an interrupt may also claim floting point corrupting guest state. > >> Signed-off-by: Mihai Caraman <mihai.cara...@freescale.com> > >> --- > >> arch/powerpc/kvm/booke.c | 1 + > >> arch/powerpc/kvm/e500mc.c | 2 -- > >> 2 files changed, 1 insertions(+), 2 deletions(-) > >> diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c > >> index 113961f..3cae2e3 100644 > >> --- a/arch/powerpc/kvm/booke.c > >> +++ b/arch/powerpc/kvm/booke.c > >> @@ -1204,6 +1204,7 @@ int kvmppc_handle_exit(struct kvm_run *run, > struct kvm_vcpu *vcpu, > >> r = (s << 2) | RESUME_HOST | (r & RESUME_FLAG_NV); > >> } else { > >> kvmppc_lazy_ee_enable(); > >> + kvmppc_load_guest_fp(vcpu); > >> } > >> } > >> diff --git a/arch/powerpc/kvm/e500mc.c b/arch/powerpc/kvm/e500mc.c > >> index 19c8379..09da1ac 100644 > >> --- a/arch/powerpc/kvm/e500mc.c > >> +++ b/arch/powerpc/kvm/e500mc.c > >> @@ -143,8 +143,6 @@ void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, > int cpu) > >> kvmppc_e500_tlbil_all(vcpu_e500); > >> __get_cpu_var(last_vcpu_on_cpu) = vcpu; > >> } > >> - > >> - kvmppc_load_guest_fp(vcpu); > >> } > >> void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu) > > > > Can we now remove vcpu->fpu_active, and the comment that says "Kernel > usage of FP (via > > enable_kernel_fp()) in this thread must not occur while vcpu- > >fpu_active is set."? > > I think so, yes.
Yes, as I already did this for AltiVec. -Mike _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
