Messages in this thread Patch in this message | | | Date | Fri, 04 Sep 2009 17:14:05 -0700 | From | Greg KH <> | Subject | [patch 30/71] KVM: SVM: force new asid on vcpu migration |
| |
2.6.30-stable review patch. If anyone has any objections, please let us know.
------------------ From: Marcelo Tosatti <mtosatti@redhat.com>
(cherry picked from commit 4b656b1202498184a0ecef86b3b89ff613b9c6ab)
If a migrated vcpu matches the asid_generation value of the target pcpu, there will be no TLB flush via TLB_CONTROL_FLUSH_ALL_ASID.
The check for vcpu.cpu in pre_svm_run is meaningless since svm_vcpu_load already updated it on schedule in.
Such vcpu will VMRUN with stale TLB entries.
Based on original patch from Joerg Roedel (http://patchwork.kernel.org/patch/10021/)
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Acked-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> --- arch/x86/kvm/svm.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
--- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -736,6 +736,7 @@ static void svm_vcpu_load(struct kvm_vcp svm->vmcb->control.tsc_offset += delta; vcpu->cpu = cpu; kvm_migrate_timers(vcpu); + svm->asid_generation = 0; } for (i = 0; i < NR_HOST_SAVE_USER_MSRS; i++) @@ -1046,7 +1047,6 @@ static void new_asid(struct vcpu_svm *sv svm->vmcb->control.tlb_ctl = TLB_CONTROL_FLUSH_ALL_ASID; } - svm->vcpu.cpu = svm_data->cpu; svm->asid_generation = svm_data->asid_generation; svm->vmcb->control.asid = svm_data->next_asid++; } @@ -2258,8 +2258,8 @@ static void pre_svm_run(struct vcpu_svm struct svm_cpu_data *svm_data = per_cpu(svm_data, cpu); svm->vmcb->control.tlb_ctl = TLB_CONTROL_DO_NOTHING; - if (svm->vcpu.cpu != cpu || - svm->asid_generation != svm_data->asid_generation) + /* FIXME: handle wraparound of asid_generation */ + if (svm->asid_generation != svm_data->asid_generation) new_asid(svm, svm_data); }
| |