[RFC,28/37] KVM: s390: protvirt: Add program exception injection
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Message ID 20191024114059.102802-29-frankja@linux.ibm.com
State New
Headers show
Series
  • KVM: s390: Add support for protected VMs
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Commit Message

Janosch Frank Oct. 24, 2019, 11:40 a.m. UTC
Only two program exceptions can be injected for a protected guest:
specification and operand

Both have a code in offset 248 of the state description, as the lowcore
is not accessible by KVM for such guests.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
---
 arch/s390/kvm/interrupt.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

Patch
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diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index 1f87c7d3fa3e..2a711bae69a7 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -826,6 +826,21 @@  static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu)
 	return rc ? -EFAULT : 0;
 }
 
+static int __deliver_prog_pv(struct kvm_vcpu *vcpu, u16 code)
+{
+	switch (code) {
+	case PGM_SPECIFICATION:
+		vcpu->arch.sie_block->iictl = IICTL_CODE_SPECIFICATION;
+		break;
+	case PGM_OPERAND:
+		vcpu->arch.sie_block->iictl = IICTL_CODE_OPERAND;
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
 static int __must_check __deliver_prog(struct kvm_vcpu *vcpu)
 {
 	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
@@ -846,6 +861,9 @@  static int __must_check __deliver_prog(struct kvm_vcpu *vcpu)
 	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
 					 pgm_info.code, 0);
 
+	if (kvm_s390_pv_is_protected(vcpu->kvm))
+		return __deliver_prog_pv(vcpu, pgm_info.code & ~PGM_PER);
+
 	switch (pgm_info.code & ~PGM_PER) {
 	case PGM_AFX_TRANSLATION:
 	case PGM_ASX_TRANSLATION: