> -----Original Message----- > From: Alexander Graf [mailto:ag...@suse.de] > Sent: Tuesday, May 15, 2012 7:59 PM > To: Bhushan Bharat-R65777 > Cc: kvm-ppc@vger.kernel.org; Bhushan Bharat-R65777 > Subject: Re: [PATCH] KVM: PPC: booke: Added DECAR support > > On 05/15/2012 09:33 AM, Bharat Bhushan wrote: > > Added the decrementer auto-reload support. > > > > Signed-off-by: Bharat Bhushan<bharat.bhus...@freescale.com> > > --- > > arch/powerpc/include/asm/kvm_host.h | 2 ++ > > arch/powerpc/kvm/booke.c | 5 +++++ > > arch/powerpc/kvm/booke_emulate.c | 7 ++++++- > > 3 files changed, 13 insertions(+), 1 deletions(-) > > > > diff --git a/arch/powerpc/include/asm/kvm_host.h > > b/arch/powerpc/include/asm/kvm_host.h > > index d848cdc..1d6f89e 100644 > > --- a/arch/powerpc/include/asm/kvm_host.h > > +++ b/arch/powerpc/include/asm/kvm_host.h > > @@ -414,7 +414,9 @@ struct kvm_vcpu_arch { > > ulong mcsrr1; > > ulong mcsr; > > u32 dec; > > +#ifdef CONFIG_BOOKE > > u32 decar; > > +#endif > > u32 tbl; > > u32 tbu; > > u32 tcr; > > diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c index > > 72f13f4..86681ee 100644 > > --- a/arch/powerpc/kvm/booke.c > > +++ b/arch/powerpc/kvm/booke.c > > @@ -1267,6 +1267,11 @@ void kvmppc_decrementer_func(unsigned long data) > > { > > struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data; > > > > + if (vcpu->arch.tcr& TCR_ARE) { > > + vcpu->arch.dec = vcpu->arch.decar; > > + kvmppc_emulate_dec(vcpu); > > + } > > + > > kvmppc_set_tsr_bits(vcpu, TSR_DIS); > > } > > > > diff --git a/arch/powerpc/kvm/booke_emulate.c > > b/arch/powerpc/kvm/booke_emulate.c > > index 6c76397..83c3796 100644 > > --- a/arch/powerpc/kvm/booke_emulate.c > > +++ b/arch/powerpc/kvm/booke_emulate.c > > @@ -129,6 +129,9 @@ int kvmppc_booke_emulate_mtspr(struct kvm_vcpu *vcpu, > > int > sprn, ulong spr_val) > > kvmppc_set_tcr(vcpu, spr_val); > > break; > > > > + case SPRN_DECAR: > > + vcpu->arch.decar = spr_val; > > + break; > > /* > > * Note: SPRG4-7 are user-readable. > > * These values are loaded into the real SPRGs when resuming the @@ > > -244,7 +247,9 @@ int kvmppc_booke_emulate_mfspr(struct kvm_vcpu *vcpu, int > sprn, ulong *spr_val) > > case SPRN_TCR: > > *spr_val = vcpu->arch.tcr; > > break; > > - > > + case SPRN_DECAR: > > + *spr_val = vcpu->arch.decar; > > + break; > > DECAR can't be read. Otherwise looks good to me.
DECAR can be read on e500mc cores. So I will make this under CONFIG_KVM_E500MC. What happens if DECAR is read on non e500mc? Is it treated as NOP or illegal instruction exception? Thanks -Bharat -- To unsubscribe from this list: send the line "unsubscribe kvm-ppc" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
