From b31605c12f4edda7a40ad9f86985739666298c31 Mon Sep 17 00:00:00 2001 From: Dominik Dingel Date: Tue, 25 Mar 2014 13:47:11 +0100 Subject: KVM: s390: make cmma usage conditionally When userspace reset the guest without notifying kvm, the CMMA state of the pages might be unused, resulting in guest data corruption. To avoid this, CMMA must be enabled only if userspace understands the implications. CMMA must be enabled before vCPU creation. It can't be switched off once enabled. All subsequently created vCPUs will be enabled for CMMA according to the CMMA state of the VM. Signed-off-by: Dominik Dingel Signed-off-by: Christian Borntraeger [remove now unnecessary calls to page_table_reset_pgste] --- arch/s390/kvm/diag.c | 6 ------ 1 file changed, 6 deletions(-) (limited to 'arch/s390/kvm/diag.c') diff --git a/arch/s390/kvm/diag.c b/arch/s390/kvm/diag.c index 44dcfa8860b5..ff768f1dd337 100644 --- a/arch/s390/kvm/diag.c +++ b/arch/s390/kvm/diag.c @@ -167,17 +167,11 @@ 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, false); - return -EOPNOTSUPP; case 3: vcpu->run->s390_reset_flags = KVM_S390_RESET_CLEAR; - page_table_reset_pgste(current->mm, 0, TASK_SIZE, false); break; case 4: vcpu->run->s390_reset_flags = 0; - page_table_reset_pgste(current->mm, 0, TASK_SIZE, false); break; default: return -EOPNOTSUPP; -- cgit v1.2.3