On 28.01.2014, at 07:46, Aneesh Kumar K.V <aneesh.ku...@linux.vnet.ibm.com>
wrote:
> This patch make sure we inherit the LE bit correctly in different case
> so that we can run Little Endian distro in PR mode
>
> Signed-off-by: Aneesh Kumar K.V <aneesh.ku...@linux.vnet.ibm.com>
> ---
> Changes from V2:
> * Move H_SET_MODE to qemu
>
>
> arch/powerpc/include/asm/kvm_host.h | 1 +
> arch/powerpc/kernel/asm-offsets.c | 1 +
> arch/powerpc/kvm/book3s_64_mmu.c | 2 +-
> arch/powerpc/kvm/book3s_pr.c | 32 +++++++++++++++++++++++++++++++-
> 4 files changed, 34 insertions(+), 2 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/kvm_host.h
> b/arch/powerpc/include/asm/kvm_host.h
> index 207b7826c9b1..f4be7be14330 100644
> --- a/arch/powerpc/include/asm/kvm_host.h
> +++ b/arch/powerpc/include/asm/kvm_host.h
> @@ -550,6 +550,7 @@ struct kvm_vcpu_arch {
> #ifdef CONFIG_PPC_BOOK3S
> ulong fault_dar;
> u32 fault_dsisr;
> + unsigned long intr_msr;
We already have a field with that name and semantics in the vcpu_arch struct.
Just move that one to a more commonly accessible part of the struct.
> #endif
>
> #ifdef CONFIG_BOOKE
> diff --git a/arch/powerpc/kernel/asm-offsets.c
> b/arch/powerpc/kernel/asm-offsets.c
> index b754f629a177..7484676b8f25 100644
> --- a/arch/powerpc/kernel/asm-offsets.c
> +++ b/arch/powerpc/kernel/asm-offsets.c
> @@ -518,6 +518,7 @@ int main(void)
> DEFINE(VCPU_SLB_NR, offsetof(struct kvm_vcpu, arch.slb_nr));
> DEFINE(VCPU_FAULT_DSISR, offsetof(struct kvm_vcpu, arch.fault_dsisr));
> DEFINE(VCPU_FAULT_DAR, offsetof(struct kvm_vcpu, arch.fault_dar));
> + DEFINE(VCPU_INTR_MSR, offsetof(struct kvm_vcpu, arch.intr_msr));
Same here:
arch/powerpc/kernel/asm-offsets.c: DEFINE(VCPU_INTR_MSR, offsetof(struct
kvm_vcpu, arch.intr_msr));
> DEFINE(VCPU_LAST_INST, offsetof(struct kvm_vcpu, arch.last_inst));
> DEFINE(VCPU_TRAP, offsetof(struct kvm_vcpu, arch.trap));
> DEFINE(VCPU_PTID, offsetof(struct kvm_vcpu, arch.ptid));
> diff --git a/arch/powerpc/kvm/book3s_64_mmu.c
> b/arch/powerpc/kvm/book3s_64_mmu.c
> index 83da1f868fd5..8231b83c493b 100644
> --- a/arch/powerpc/kvm/book3s_64_mmu.c
> +++ b/arch/powerpc/kvm/book3s_64_mmu.c
> @@ -38,7 +38,7 @@
>
> static void kvmppc_mmu_book3s_64_reset_msr(struct kvm_vcpu *vcpu)
> {
> - kvmppc_set_msr(vcpu, MSR_SF);
> + kvmppc_set_msr(vcpu, vcpu->arch.intr_msr);
> }
>
> static struct kvmppc_slb *kvmppc_mmu_book3s_64_find_slbe(
> diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
> index eb070eb4da40..828056ec208f 100644
> --- a/arch/powerpc/kvm/book3s_pr.c
> +++ b/arch/powerpc/kvm/book3s_pr.c
> @@ -263,7 +263,7 @@ static void kvmppc_recalc_shadow_msr(struct kvm_vcpu
> *vcpu)
> ulong smsr = vcpu->arch.shared->msr;
>
> /* Guest MSR values */
> - smsr &= MSR_FE0 | MSR_FE1 | MSR_SF | MSR_SE | MSR_BE;
> + smsr &= MSR_FE0 | MSR_FE1 | MSR_SF | MSR_SE | MSR_BE | MSR_LE;
> /* Process MSR values */
> smsr |= MSR_ME | MSR_RI | MSR_IR | MSR_DR | MSR_PR | MSR_EE;
> /* External providers the guest reserved */
> @@ -1178,6 +1178,15 @@ static int kvmppc_get_one_reg_pr(struct kvm_vcpu
> *vcpu, u64 id,
> break;
> }
> #endif /* CONFIG_VSX */
> + case KVM_REG_PPC_LPCR:
> + /*
> + * We are only interested in the LPCR_ILE bit
> + */
> + if (vcpu->arch.intr_msr & MSR_LE)
> + *val = get_reg_val(id, LPCR_ILE);
> + else
> + *val = get_reg_val(id, 0);
> + break;
> default:
> r = -EINVAL;
> break;
> @@ -1186,6 +1195,23 @@ static int kvmppc_get_one_reg_pr(struct kvm_vcpu
> *vcpu, u64 id,
> return r;
> }
>
> +static void kvmppc_set_lpcr_pr(struct kvm_vcpu *vcpu, u64 new_lpcr)
> +{
> + struct kvm *kvm = vcpu->kvm;
> + /*
> + * If ILE (interrupt little-endian) has changed, update the
> + * MSR_LE bit in the intr_msr for each vcpu in this vcore.
> + */
> + if ((new_lpcr & LPCR_ILE) != (vcpu->arch.intr_msr & MSR_LE)) {
> + mutex_lock(&kvm->lock);
Why the lock?
Alex
> + if (new_lpcr & LPCR_ILE)
> + vcpu->arch.intr_msr |= MSR_LE;
> + else
> + vcpu->arch.intr_msr &= ~MSR_LE;
> + mutex_unlock(&kvm->lock);
> + }
> +}
> +
> static int kvmppc_set_one_reg_pr(struct kvm_vcpu *vcpu, u64 id,
> union kvmppc_one_reg *val)
> {
> @@ -1209,6 +1235,9 @@ static int kvmppc_set_one_reg_pr(struct kvm_vcpu *vcpu,
> u64 id,
> break;
> }
> #endif /* CONFIG_VSX */
> + case KVM_REG_PPC_LPCR:
> + kvmppc_set_lpcr_pr(vcpu, set_reg_val(id, *val));
> + break;
> default:
> r = -EINVAL;
> break;
> @@ -1261,6 +1290,7 @@ static struct kvm_vcpu
> *kvmppc_core_vcpu_create_pr(struct kvm *kvm,
> vcpu->arch.pvr = 0x3C0301;
> if (mmu_has_feature(MMU_FTR_1T_SEGMENT))
> vcpu->arch.pvr = mfspr(SPRN_PVR);
> + vcpu->arch.intr_msr = MSR_SF;
> #else
> /* default to book3s_32 (750) */
> vcpu->arch.pvr = 0x84202;
> --
> 1.8.5.3
>
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