From debf27d6b92d7a98e0153ca8e3a990ea7a45b4da Mon Sep 17 00:00:00 2001 From: Mihai Caraman Date: Fri, 4 Jul 2014 11:17:28 +0300 Subject: KVM: PPC: e500: Emulate power management control SPR For FSL e6500 core the kernel uses power management SPR register (PWRMGTCR0) to enable idle power down for cores and devices by setting up the idle count period at boot time. With the host already controlling the power management configuration the guest could simply benefit from it, so emulate guest request as a general store. Signed-off-by: Mihai Caraman Signed-off-by: Alexander Graf --- arch/powerpc/include/asm/kvm_host.h | 1 + arch/powerpc/kvm/e500_emulate.c | 12 ++++++++++++ 2 files changed, 13 insertions(+) diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h index 62b2cee450a5..faf2f0e56bb8 100644 --- a/arch/powerpc/include/asm/kvm_host.h +++ b/arch/powerpc/include/asm/kvm_host.h @@ -584,6 +584,7 @@ struct kvm_vcpu_arch { u32 mmucfg; u32 eptcfg; u32 epr; + u32 pwrmgtcr0; u32 crit_save; /* guest debug registers*/ struct debug_reg dbg_reg; diff --git a/arch/powerpc/kvm/e500_emulate.c b/arch/powerpc/kvm/e500_emulate.c index 002d51764143..c99c40e9182a 100644 --- a/arch/powerpc/kvm/e500_emulate.c +++ b/arch/powerpc/kvm/e500_emulate.c @@ -250,6 +250,14 @@ int kvmppc_core_emulate_mtspr_e500(struct kvm_vcpu *vcpu, int sprn, ulong spr_va spr_val); break; + case SPRN_PWRMGTCR0: + /* + * Guest relies on host power management configurations + * Treat the request as a general store + */ + vcpu->arch.pwrmgtcr0 = spr_val; + break; + /* extra exceptions */ case SPRN_IVOR32: vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_UNAVAIL] = spr_val; @@ -368,6 +376,10 @@ int kvmppc_core_emulate_mfspr_e500(struct kvm_vcpu *vcpu, int sprn, ulong *spr_v *spr_val = vcpu->arch.eptcfg; break; + case SPRN_PWRMGTCR0: + *spr_val = vcpu->arch.pwrmgtcr0; + break; + /* extra exceptions */ case SPRN_IVOR32: *spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_UNAVAIL]; -- cgit v1.2.3