[PATCH] powerpc: book3s: PR: Enable Little Endian PR guest

[Alexander Graf]

Am 11.11.2013 um 09:08 schrieb "Aneesh Kumar K.V" <aneesh.kumar at linux.vnet.ibm.com>:

> From: "Aneesh Kumar K.V" <aneesh.kumar at linux.vnet.ibm.com>
> 
> 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.kumar at linux.vnet.ibm.com>

This is not how real hardware works, is it? Could you please point me to the bits in the ISA that indicate that we should preserve the LE bit anywhere? :)

Alex

> ---
> 
> This patch depends on the below two changes
> 1)  [PATCH v5 0/6] KVM: PPC: Book3S: MMIO support for Little Endian guests (kvm-ppc)
>        http://mid.gmane.org/1383672128-26795-1-git-send-email-clg@fr.ibm.com
> 2) [PATCH] powerpc: book3s: kvm: Use the saved dsisr and dar values
>       http://mid.gmane.org/1384178577-23721-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com
> 
> arch/powerpc/kvm/book3s_64_mmu.c | 2 +-
> arch/powerpc/kvm/book3s_pr.c     | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/powerpc/kvm/book3s_64_mmu.c b/arch/powerpc/kvm/book3s_64_mmu.c
> index 83da1f8..d339096 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, MSR_SF | (vcpu->arch.shared->msr & MSR_LE));
> }
> 
> 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 a7fe87a..cf9362c 100644
> --- a/arch/powerpc/kvm/book3s_pr.c
> +++ b/arch/powerpc/kvm/book3s_pr.c
> @@ -226,7 +226,7 @@ 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 */
> -- 
> 1.8.3.2
> 
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