* [PATCH] powerpc: book3s: PR: Enable Little Endian PR guest
@ 2013-11-11 14:08 Aneesh Kumar K.V
2013-11-12 12:37 ` Alexander Graf
0 siblings, 1 reply; 3+ messages in thread
From: Aneesh Kumar K.V @ 2013-11-11 14:08 UTC (permalink / raw)
To: agraf, benh, paulus; +Cc: linuxppc-dev, kvm, kvm-ppc, Aneesh Kumar K.V
From: "Aneesh Kumar K.V" <aneesh.kumar@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@linux.vnet.ibm.com>
---
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
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [PATCH] powerpc: book3s: PR: Enable Little Endian PR guest
2013-11-11 14:08 [PATCH] powerpc: book3s: PR: Enable Little Endian PR guest Aneesh Kumar K.V
@ 2013-11-12 12:37 ` Alexander Graf
2013-11-12 21:03 ` Paul Mackerras
0 siblings, 1 reply; 3+ messages in thread
From: Alexander Graf @ 2013-11-12 12:37 UTC (permalink / raw)
To: Aneesh Kumar K.V
Cc: kvm@vger.kernel.org, kvm-ppc@vger.kernel.org, paulus@samba.org,
Aneesh Kumar K.V, linuxppc-dev@lists.ozlabs.org
Am 11.11.2013 um 09:08 schrieb "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.i=
bm.com>:
> From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
>=20
> This patch make sure we inherit the LE bit correctly in different case
> so that we can run Little Endian distro in PR mode
>=20
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@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
> ---
>=20
> 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.c=
om
> 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
>=20
> arch/powerpc/kvm/book3s_64_mmu.c | 2 +-
> arch/powerpc/kvm/book3s_pr.c | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)
>=20
> 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 @@
>=20
> 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));
> }
>=20
> 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 =3D vcpu->arch.shared->msr;
>=20
> /* Guest MSR values */
> - smsr &=3D MSR_FE0 | MSR_FE1 | MSR_SF | MSR_SE | MSR_BE;
> + smsr &=3D MSR_FE0 | MSR_FE1 | MSR_SF | MSR_SE | MSR_BE | MSR_LE;
> /* Process MSR values */
> smsr |=3D MSR_ME | MSR_RI | MSR_IR | MSR_DR | MSR_PR | MSR_EE;
> /* External providers the guest reserved */
> --=20
> 1.8.3.2
>=20
> --
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^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [PATCH] powerpc: book3s: PR: Enable Little Endian PR guest
2013-11-12 12:37 ` Alexander Graf
@ 2013-11-12 21:03 ` Paul Mackerras
0 siblings, 0 replies; 3+ messages in thread
From: Paul Mackerras @ 2013-11-12 21:03 UTC (permalink / raw)
To: Alexander Graf
Cc: kvm-ppc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
Aneesh Kumar K.V, kvm@vger.kernel.org
On Tue, Nov 12, 2013 at 07:37:24AM -0500, Alexander Graf wrote:
>
>
> Am 11.11.2013 um 09:08 schrieb "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>:
>
> > From: "Aneesh Kumar K.V" <aneesh.kumar@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@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? :)
No, it isn't. What we should really be doing depends a bit on what
CPU we're emulating. Older CPUs had an ILE bit in the MSR that got
copied to LE on interrupt. Recent POWER CPUs moved the ILE bit to the
LPCR, so for them we should have an emulated LPCR (and implement
H_SET_MODE for pseries guests so they can control LPCR[ILE]).
Embedded CPUs of course don't have an LE bit, or an ILE bit, since
they control endianness on a per-page basis.
Paul.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2013-11-11 14:08 [PATCH] powerpc: book3s: PR: Enable Little Endian PR guest Aneesh Kumar K.V
2013-11-12 12:37 ` Alexander Graf
2013-11-12 21:03 ` Paul Mackerras
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