On 30.01.2013, at 14:29, Mihai Caraman wrote:
> EPTCFG register defined by E.PT is accessed unconditionally by Linux guests
> in the presence of MAV 2.0. Emulate EPTCFG register now.
>
> Signed-off-by: Mihai Caraman <mihai.cara...@freescale.com>
> ---
> arch/powerpc/include/asm/kvm_host.h | 1 +
> arch/powerpc/kvm/e500.h | 6 ++++++
> arch/powerpc/kvm/e500_emulate.c | 9 +++++++++
> arch/powerpc/kvm/e500_mmu.c | 5 +++++
> 4 files changed, 21 insertions(+), 0 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/kvm_host.h
> b/arch/powerpc/include/asm/kvm_host.h
> index 88fcfe6..f480b20 100644
> --- a/arch/powerpc/include/asm/kvm_host.h
> +++ b/arch/powerpc/include/asm/kvm_host.h
> @@ -503,6 +503,7 @@ struct kvm_vcpu_arch {
> u32 tlbcfg[4];
> u32 tlbps[4];
> u32 mmucfg;
> + u32 eptcfg;
This too needs to be settable through SW_TLB.
> u32 epr;
> struct kvmppc_booke_debug_reg dbg_reg;
> #endif
> diff --git a/arch/powerpc/kvm/e500.h b/arch/powerpc/kvm/e500.h
> index b9f76d8..983eb95 100644
> --- a/arch/powerpc/kvm/e500.h
> +++ b/arch/powerpc/kvm/e500.h
> @@ -308,4 +308,10 @@ static inline unsigned int has_mmu_v2(const struct
> kvm_vcpu *vcpu)
> return ((vcpu->arch.mmucfg & MMUCFG_MAVN) == MMUCFG_MAVN_V2);
> }
>
> +static inline unsigned int supports_page_tables(const struct kvm_vcpu *vcpu)
bool again. Can we generalize this a bit more? How about a small framework that
allows us to differentiate across e.XX features?
if (has_feature(vcpu, FEATURE_E_PT))
...
> +{
> + return ((vcpu->arch.tlbcfg[0] & TLBnCFG_IND)
> + || (vcpu->arch.tlbcfg[1] & TLBnCFG_IND));
> +}
> +
> #endif /* KVM_E500_H */
> diff --git a/arch/powerpc/kvm/e500_emulate.c b/arch/powerpc/kvm/e500_emulate.c
> index 5515dc5..493e231 100644
> --- a/arch/powerpc/kvm/e500_emulate.c
> +++ b/arch/powerpc/kvm/e500_emulate.c
> @@ -339,6 +339,15 @@ int kvmppc_core_emulate_mfspr(struct kvm_vcpu *vcpu, int
> sprn, ulong *spr_val)
> return EMULATE_FAIL;
> *spr_val = vcpu->arch.tlbps[1];
> break;
> + case SPRN_EPTCFG:
> + if (!has_mmu_v2(vcpu))
> + return EMULATE_FAIL;
> + /*
> + * Legacy Linux guests access EPTCFG register even if the E.PT
> + * category is disabled in the VM. Give them a chance to live.
> + */
> + *spr_val = vcpu->arch.eptcfg;
> + break;
> default:
> emulated = kvmppc_booke_emulate_mfspr(vcpu, sprn, spr_val);
> }
> diff --git a/arch/powerpc/kvm/e500_mmu.c b/arch/powerpc/kvm/e500_mmu.c
> index 9a1f7b7..199c11e 100644
> --- a/arch/powerpc/kvm/e500_mmu.c
> +++ b/arch/powerpc/kvm/e500_mmu.c
> @@ -799,6 +799,11 @@ int kvmppc_e500_tlb_init(struct kvmppc_vcpu_e500
> *vcpu_e500)
> if (has_mmu_v2(vcpu)) {
> vcpu->arch.tlbps[0] = mfspr(SPRN_TLB0PS);
> vcpu->arch.tlbps[1] = mfspr(SPRN_TLB1PS);
> +
> + if (supports_page_tables(vcpu))
> + vcpu->arch.eptcfg = mfspr(SPRN_EPTCFG);
Please don't introduce new mfspr()s here :). Just have user space set it.
Alex
> + else
> + vcpu->arch.eptcfg = 0;
> }
>
> kvmppc_recalc_tlb1map_range(vcpu_e500);
> --
> 1.7.4.1
>
>
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