Commit 2585e507 authored Mar 19, 2020 by Janosch Frank Committed by Cornelia Huck Apr 29, 2020

s390x: protvirt: KVM intercept changes



Protected VMs no longer intercept with code 4 for an instruction
interception. Instead they have codes 104 and 108 for protected
instruction interception and protected instruction notification
respectively.

The 104 mirrors the 4 interception.

The 108 is a notification interception to let KVM and QEMU know that
something changed and we need to update tracking information or
perform specific tasks. It's currently taken for the following
instructions:

* spx (To inform about the changed prefix location)
* sclp (On incorrect SCCB values, so we can inject a IRQ)
* sigp (All but "stop and store status")
* diag308 (Subcodes 0/1)

Of these exits only sclp errors, state changing sigps and diag308 will
reach QEMU. QEMU will do its parts of the job, while the ultravisor
has done the instruction part of the job.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Message-Id: <20200319131921.2367-7-frankja@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>

parent b1697f63

target/s390x/kvm.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -115,6 +115,8 @@
		#define ICPT_CPU_STOP 0x28
		#define ICPT_OPEREXC 0x2c
		#define ICPT_IO 0x40
		#define ICPT_PV_INSTR 0x68
		#define ICPT_PV_INSTR_NOTIFICATION 0x6c

		#define NR_LOCAL_IRQS 32
		/*
		@@ -1698,6 +1700,8 @@ static int handle_intercept(S390CPU *cpu)
		(long)cs->kvm_run->psw_addr);
		switch (icpt_code) {
		case ICPT_INSTRUCTION:
		case ICPT_PV_INSTR:
		case ICPT_PV_INSTR_NOTIFICATION:
		r = handle_instruction(cpu, run);
		break;
		case ICPT_PROGRAM: