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| author | David Hildenbrand <dahi@linux.vnet.ibm.com> | 2016-04-13 18:06:50 +0300 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2016-06-21 10:43:47 +0300 |
| commit | 5d3876a8bf4607b72cbe754278d19c68990b57a8 (patch) | |
| tree | f9c52c8a816c956ef652676ae8045187f08f3904 /arch/s390/kvm/kvm-s390.c | |
| parent | 91473b487dd58af6384c5c3db13de50defa2c106 (diff) | |
| download | linux-5d3876a8bf4607b72cbe754278d19c68990b57a8.tar.xz | |
KVM: s390: vsie: add indication for future features
We have certain SIE features that we cannot support for now.
Let's add these features, so user space can directly prepare to enable
them, so we don't have to update yet another component.
In addition, add a comment block, telling why it is for now not possible to
forward/enable these features.
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
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) |