| Message ID | 20130219041309.GA17075@home.buserror.net (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 19.02.2013, at 05:13, Scott Wood wrote: > The existing check handles the case where we've migrated to a different > core than we last ran on, but it doesn't handle the case where we're > still on the same cpu we last ran on, but some other vcpu has run on > this cpu in the meantime. > > Signed-off-by: Scott Wood <scottwood@freescale.com> > --- > This seems to have been the cause of the userspace segfaults I was > seeing (the other TLB patches I posted are still needed as well). > > arch/powerpc/kvm/e500mc.c | 6 +++++- > 1 file changed, 5 insertions(+), 1 deletion(-) > > diff --git a/arch/powerpc/kvm/e500mc.c b/arch/powerpc/kvm/e500mc.c > index 1f89d26..8637689 100644 > --- a/arch/powerpc/kvm/e500mc.c > +++ b/arch/powerpc/kvm/e500mc.c > @@ -111,6 +111,7 @@ void kvmppc_mmu_msr_notify(struct kvm_vcpu *vcpu, u32 old_msr) > void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu) > { > struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu); > + static struct kvm_vcpu *last_vcpu_on_cpu[NR_CPUS]; Why not use DEFINE_PER_CPU? Alex > > kvmppc_booke_vcpu_load(vcpu, cpu); > > @@ -136,8 +137,11 @@ void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu) > mtspr(SPRN_GDEAR, vcpu->arch.shared->dar); > mtspr(SPRN_GESR, vcpu->arch.shared->esr); > > - if (vcpu->arch.oldpir != mfspr(SPRN_PIR)) > + if (vcpu->arch.oldpir != mfspr(SPRN_PIR) || > + last_vcpu_on_cpu[smp_processor_id()] != vcpu) { > kvmppc_e500_tlbil_all(vcpu_e500); > + last_vcpu_on_cpu[smp_processor_id()] = vcpu; > + } > > kvmppc_load_guest_fp(vcpu); > } > -- > 1.7.9.5 > -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/arch/powerpc/kvm/e500mc.c b/arch/powerpc/kvm/e500mc.c index 1f89d26..8637689 100644 --- a/arch/powerpc/kvm/e500mc.c +++ b/arch/powerpc/kvm/e500mc.c @@ -111,6 +111,7 @@ void kvmppc_mmu_msr_notify(struct kvm_vcpu *vcpu, u32 old_msr) void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu) { struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu); + static struct kvm_vcpu *last_vcpu_on_cpu[NR_CPUS]; kvmppc_booke_vcpu_load(vcpu, cpu); @@ -136,8 +137,11 @@ void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu) mtspr(SPRN_GDEAR, vcpu->arch.shared->dar); mtspr(SPRN_GESR, vcpu->arch.shared->esr); - if (vcpu->arch.oldpir != mfspr(SPRN_PIR)) + if (vcpu->arch.oldpir != mfspr(SPRN_PIR) || + last_vcpu_on_cpu[smp_processor_id()] != vcpu) { kvmppc_e500_tlbil_all(vcpu_e500); + last_vcpu_on_cpu[smp_processor_id()] = vcpu; + } kvmppc_load_guest_fp(vcpu); }
The existing check handles the case where we've migrated to a different core than we last ran on, but it doesn't handle the case where we're still on the same cpu we last ran on, but some other vcpu has run on this cpu in the meantime. Signed-off-by: Scott Wood <scottwood@freescale.com> --- This seems to have been the cause of the userspace segfaults I was seeing (the other TLB patches I posted are still needed as well). arch/powerpc/kvm/e500mc.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)