From: Janosch Frank <frankja@xxxxxxxxxxxxxxxxxx>
This commit introduces code that handles operation exception
interceptions. With this handler we can emulate instructions by using
illegal opcodes.
Signed-off-by: Janosch Frank <frankja@xxxxxxxxxxxxxxxxxx>
Reviewed-by: David Hildenbrand <dahi@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
---
arch/s390/include/asm/kvm_host.h | 1 +
arch/s390/kvm/intercept.c | 11 +++++++++++
arch/s390/kvm/kvm-s390.c | 1 +
arch/s390/kvm/trace.h | 21 +++++++++++++++++++++
4 files changed, 34 insertions(+)
diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index 37b9017..093ea14 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -255,6 +255,7 @@ struct kvm_vcpu_stat {
u32 instruction_stctg;
u32 exit_program_interruption;
u32 exit_instr_and_program;
+ u32 exit_operation_exception;
u32 deliver_external_call;
u32 deliver_emergency_signal;
u32 deliver_service_signal;
diff --git a/arch/s390/kvm/intercept.c b/arch/s390/kvm/intercept.c
index 2e6b54e..09c13db 100644
--- a/arch/s390/kvm/intercept.c
+++ b/arch/s390/kvm/intercept.c
@@ -349,6 +349,15 @@ static int handle_partial_execution(struct kvm_vcpu *vcpu)
return -EOPNOTSUPP;
}
+static int handle_operexc(struct kvm_vcpu *vcpu)
+{
+ vcpu->stat.exit_operation_exception++;
+ trace_kvm_s390_handle_operexc(vcpu, vcpu->arch.sie_block->ipa,
+ vcpu->arch.sie_block->ipb);
+
+ return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
+}
+
int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
{
if (kvm_is_ucontrol(vcpu->kvm))
@@ -370,6 +379,8 @@ int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
return handle_validity(vcpu);
case 0x28:
return handle_stop(vcpu);
+ case 0x2c:
+ return handle_operexc(vcpu);
case 0x38:
return handle_partial_execution(vcpu);
default:
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 6d8ec3a..f0addec 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -63,6 +63,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
{ "exit_instruction", VCPU_STAT(exit_instruction) },
{ "exit_program_interruption", VCPU_STAT(exit_program_interruption) },
{ "exit_instr_and_program_int", VCPU_STAT(exit_instr_and_program) },
+ { "exit_operation_exception", VCPU_STAT(exit_operation_exception) },
{ "halt_successful_poll", VCPU_STAT(halt_successful_poll) },
{ "halt_attempted_poll", VCPU_STAT(halt_attempted_poll) },
{ "halt_poll_invalid", VCPU_STAT(halt_poll_invalid) },
diff --git a/arch/s390/kvm/trace.h b/arch/s390/kvm/trace.h
index 916834d..90d26a6 100644
--- a/arch/s390/kvm/trace.h
+++ b/arch/s390/kvm/trace.h
@@ -412,6 +412,27 @@ TRACE_EVENT(kvm_s390_handle_stsi,
__entry->addr)
);
+TRACE_EVENT(kvm_s390_handle_operexc,
+ TP_PROTO(VCPU_PROTO_COMMON, __u16 ipa, __u32 ipb),
+ TP_ARGS(VCPU_ARGS_COMMON, ipa, ipb),
+
+ TP_STRUCT__entry(
+ VCPU_FIELD_COMMON
+ __field(__u64, instruction)
+ ),
+
+ TP_fast_assign(
+ VCPU_ASSIGN_COMMON
+ __entry->instruction = ((__u64)ipa << 48) |
+ ((__u64)ipb << 16);
+ ),
+
+ VCPU_TP_PRINTK("operation exception on instruction %016llx (%s)",
+ __entry->instruction,
+ __print_symbolic(icpt_insn_decoder(__entry->instruction),
+ icpt_insn_codes))
+ );
+
#endif /* _TRACE_KVM_H */
/* This part must be outside protection */
--
2.5.5
--
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