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| author | Scott Wood <scottwood@freescale.com> | 2011-04-27 17:24:10 -0500 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2011-05-22 08:47:50 -0400 |
| commit | eab176722f4628b2d9cf76221a43dd3a0e37e632 (patch) | |
| tree | 4b1e9e9ecb6adc4fb97c47ad5a3c174d3ad942ef | |
| parent | 1a040b26c5c915b317103b87ae7006d40443f197 (diff) | |
| download | blackbird-op-linux-eab176722f4628b2d9cf76221a43dd3a0e37e632.tar.gz blackbird-op-linux-eab176722f4628b2d9cf76221a43dd3a0e37e632.zip | |
KVM: PPC: booke: save/restore VRSAVE (a.k.a. USPRG0)
Linux doesn't use USPRG0 (now renamed VRSAVE in the architecture, even
when Altivec isn't involved), but a guest might.
Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
| -rw-r--r-- | arch/powerpc/include/asm/kvm_host.h | 1 | ||||
| -rw-r--r-- | arch/powerpc/kernel/asm-offsets.c | 1 | ||||
| -rw-r--r-- | arch/powerpc/kvm/booke_interrupts.S | 1 | ||||
| -rw-r--r-- | arch/powerpc/kvm/powerpc.c | 13 |
4 files changed, 15 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h index 890897cee050..a16804399165 100644 --- a/arch/powerpc/include/asm/kvm_host.h +++ b/arch/powerpc/include/asm/kvm_host.h @@ -223,6 +223,7 @@ struct kvm_vcpu_arch { ulong hflags; ulong guest_owned_ext; #endif + u32 vrsave; /* also USPRG0 */ u32 mmucr; ulong sprg4; ulong sprg5; diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c index 23e6a93145ab..cf0d82278951 100644 --- a/arch/powerpc/kernel/asm-offsets.c +++ b/arch/powerpc/kernel/asm-offsets.c @@ -395,6 +395,7 @@ int main(void) DEFINE(VCPU_HOST_STACK, offsetof(struct kvm_vcpu, arch.host_stack)); DEFINE(VCPU_HOST_PID, offsetof(struct kvm_vcpu, arch.host_pid)); DEFINE(VCPU_GPRS, offsetof(struct kvm_vcpu, arch.gpr)); + DEFINE(VCPU_VRSAVE, offsetof(struct kvm_vcpu, arch.vrsave)); DEFINE(VCPU_SPRG4, offsetof(struct kvm_vcpu, arch.sprg4)); DEFINE(VCPU_SPRG5, offsetof(struct kvm_vcpu, arch.sprg5)); DEFINE(VCPU_SPRG6, offsetof(struct kvm_vcpu, arch.sprg6)); diff --git a/arch/powerpc/kvm/booke_interrupts.S b/arch/powerpc/kvm/booke_interrupts.S index 1cc471faac2d..b58ccae95904 100644 --- a/arch/powerpc/kvm/booke_interrupts.S +++ b/arch/powerpc/kvm/booke_interrupts.S @@ -380,7 +380,6 @@ lightweight_exit: * because host interrupt handlers would get confused. */ lwz r1, VCPU_GPR(r1)(r4) - /* XXX handle USPRG0 */ /* Host interrupt handlers may have clobbered these guest-readable * SPRGs, so we need to reload them here with the guest's values. */ lwz r3, VCPU_SPRG4(r4) diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index ec3d2e75c0a8..9e6aa8bfd160 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -298,12 +298,25 @@ void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) { +#ifdef CONFIG_BOOKE + /* + * vrsave (formerly usprg0) isn't used by Linux, but may + * be used by the guest. + * + * On non-booke this is associated with Altivec and + * is handled by code in book3s.c. + */ + mtspr(SPRN_VRSAVE, vcpu->arch.vrsave); +#endif kvmppc_core_vcpu_load(vcpu, cpu); } void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) { kvmppc_core_vcpu_put(vcpu); +#ifdef CONFIG_BOOKE + vcpu->arch.vrsave = mfspr(SPRN_VRSAVE); +#endif } int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, |
