diff options
Diffstat (limited to 'arch/s390/kvm/kvm-s390.c')
| -rw-r--r-- | arch/s390/kvm/kvm-s390.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 6fdf1f7647d7..31cf22f7d846 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -281,6 +281,24 @@ static void kvm_s390_cpu_feat_init(void) allow_cpu_feat(KVM_S390_VM_CPU_FEAT_CEI); if (sclp.has_ibs) allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IBS); + /* + * KVM_S390_VM_CPU_FEAT_SKEY: Wrong shadow of PTE.I bits will make + * all skey handling functions read/set the skey from the PGSTE + * instead of the real storage key. + * + * KVM_S390_VM_CPU_FEAT_CMMA: Wrong shadow of PTE.I bits will make + * pages being detected as preserved although they are resident. + * + * KVM_S390_VM_CPU_FEAT_PFMFI: Wrong shadow of PTE.I bits will + * have the same effect as for KVM_S390_VM_CPU_FEAT_SKEY. + * + * For KVM_S390_VM_CPU_FEAT_SKEY, KVM_S390_VM_CPU_FEAT_CMMA and + * KVM_S390_VM_CPU_FEAT_PFMFI, all PTE.I and PGSTE bits have to be + * correctly shadowed. We can do that for the PGSTE but not for PTE.I. + * + * KVM_S390_VM_CPU_FEAT_SIGPIF: Wrong SCB addresses in the SCA. We + * cannot easily shadow the SCA because of the ipte lock. + */ } int kvm_arch_init(void *opaque) |