[RFC 21/37] KVM: S390: protvirt: Instruction emulation

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We have two new SIE exit codes 104 for a secure instruction
interception, on which the SIE needs hypervisor action to complete the
instruction.

And 108 which is merely a notification and provides data for tracking
and management, like for the lowcore we set notification bits for the
lowcore pages.

Signed-off-by: Janosch Frank <frankja@xxxxxxxxxxxxx>
---
 arch/s390/include/asm/kvm_host.h |  2 ++
 arch/s390/kvm/intercept.c        | 23 +++++++++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index 2a8a1e21e1c3..a42dfe98128b 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -212,6 +212,8 @@ struct kvm_s390_sie_block {
 #define ICPT_KSS	0x5c
 #define ICPT_PV_MCHKR	0x60
 #define ICPT_PV_INT_EN	0x64
+#define ICPT_PV_INSTR	0x68
+#define ICPT_PV_NOT	0x6c
 	__u8	icptcode;		/* 0x0050 */
 	__u8	icptstatus;		/* 0x0051 */
 	__u16	ihcpu;			/* 0x0052 */
diff --git a/arch/s390/kvm/intercept.c b/arch/s390/kvm/intercept.c
index b013a9c88d43..a1df8a43c88b 100644
--- a/arch/s390/kvm/intercept.c
+++ b/arch/s390/kvm/intercept.c
@@ -451,6 +451,23 @@ static int handle_operexc(struct kvm_vcpu *vcpu)
 	return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
 }
 
+static int handle_pv_spx(struct kvm_vcpu *vcpu)
+{
+	u32 pref = *(u32 *)vcpu->arch.sie_block->sidad;
+
+	kvm_s390_set_prefix(vcpu, pref);
+	trace_kvm_s390_handle_prefix(vcpu, 1, pref);
+	return 0;
+}
+
+static int handle_pv_not(struct kvm_vcpu *vcpu)
+{
+	if (vcpu->arch.sie_block->ipa == 0xb210)
+		return handle_pv_spx(vcpu);
+
+	return handle_instruction(vcpu);
+}
+
 int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
 {
 	int rc, per_rc = 0;
@@ -505,6 +522,12 @@ int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
 		 */
 		rc = 0;
 	break;
+	case ICPT_PV_INSTR:
+		rc = handle_instruction(vcpu);
+		break;
+	case ICPT_PV_NOT:
+		rc = handle_pv_not(vcpu);
+		break;
 	default:
 		return -EOPNOTSUPP;
 	}
-- 
2.20.1




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