kvm/s390: also set guest pages back to stable on kexec/kdump

We need to reset the usage state of the pages on kexec/kdump,
which use subcode 0 and 1. We will only do the cmma reset in
the kernel, everything else is done in userspace as before.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/s390/kvm/diag.c b/arch/s390/kvm/diag.c
index 6f9cfa500372..1facd9277f38 100644
--- a/arch/s390/kvm/diag.c
+++ b/arch/s390/kvm/diag.c
@@ -85,6 +85,10 @@ static int __diag_ipl_functions(struct kvm_vcpu *vcpu)
 
         VCPU_EVENT(vcpu, 5, "diag ipl functions, subcode %lx", subcode);
         switch (subcode) {
+        case 0:
+        case 1:
+                page_table_reset_pgste(current->mm, 0, TASK_SIZE);
+                return -EOPNOTSUPP;
         case 3:
                 vcpu->run->s390_reset_flags = KVM_S390_RESET_CLEAR;
                 page_table_reset_pgste(current->mm, 0, TASK_SIZE);