| Message ID | 20130308202510.GA9616@home.buserror.net (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 08.03.2013, at 21:25, 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. > > Without this, guest segfaults (and other misbehavior) have been seen in > smp guests. > > Cc: stable@vger.kernel.org # 3.8.x > Signed-off-by: Scott Wood <scottwood@freescale.com> Thanks, applied to kvm-ppc-3.9. Alex -- 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
> On 08.03.2013, at 21:25, 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. > > > > Without this, guest segfaults (and other misbehavior) have been seen in > > smp guests. > > > > Cc: stable@vger.kernel.org # 3.8.x > > Signed-off-by: Scott Wood <scottwood@freescale.com> > > Thanks, applied to kvm-ppc-3.9. > > > Alex Can you pull it into kvm-ppc-queue? Thanks, Mike -- 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..2f4baa0 100644 --- a/arch/powerpc/kvm/e500mc.c +++ b/arch/powerpc/kvm/e500mc.c @@ -108,6 +108,8 @@ void kvmppc_mmu_msr_notify(struct kvm_vcpu *vcpu, u32 old_msr) { } +static DEFINE_PER_CPU(struct kvm_vcpu *, last_vcpu_on_cpu); + void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu) { struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu); @@ -136,8 +138,11 @@ 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) || + __get_cpu_var(last_vcpu_on_cpu) != vcpu) { kvmppc_e500_tlbil_all(vcpu_e500); + __get_cpu_var(last_vcpu_on_cpu) = 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. Without this, guest segfaults (and other misbehavior) have been seen in smp guests. Cc: stable@vger.kernel.org # 3.8.x Signed-off-by: Scott Wood <scottwood@freescale.com> --- arch/powerpc/kvm/e500mc.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)