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Commit a011eeb2 authored by Janosch Frank's avatar Janosch Frank Committed by Christian Borntraeger
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KVM: s390: Add operation exception interception handler 



This commit introduces code that handles operation exception
interceptions. With this handler we can emulate instructions by using
illegal opcodes.

Signed-off-by: default avatarJanosch Frank <frankja@linux.vnet.ibm.com>
Reviewed-by: default avatarDavid Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
parent 022bd2d1

arch/s390/include/asm/kvm_host.h

+1 −0
Original line number Original line Diff line number Diff line
@@ -255,6 +255,7 @@ struct kvm_vcpu_stat { 
	u32 instruction_stctg;

	u32 instruction_stctg;

	u32 exit_program_interruption;

	u32 exit_program_interruption;

	u32 exit_instr_and_program;

	u32 exit_instr_and_program;

	u32 exit_operation_exception;

	u32 deliver_external_call;

	u32 deliver_external_call;

	u32 deliver_emergency_signal;

	u32 deliver_emergency_signal;

	u32 deliver_service_signal;

	u32 deliver_service_signal;

arch/s390/kvm/intercept.c

+11 −0
Original line number Original line Diff line number Diff line
@@ -349,6 +349,15 @@ static int handle_partial_execution(struct kvm_vcpu *vcpu) 
	return -EOPNOTSUPP;

	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)

int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)

{

{

	if (kvm_is_ucontrol(vcpu->kvm))

	if (kvm_is_ucontrol(vcpu->kvm))
@@ -370,6 +379,8 @@ int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu) 
		return handle_validity(vcpu);

		return handle_validity(vcpu);

	case 0x28:

	case 0x28:

		return handle_stop(vcpu);

		return handle_stop(vcpu);

	case 0x2c:

		return handle_operexc(vcpu);

	case 0x38:

	case 0x38:

		return handle_partial_execution(vcpu);

		return handle_partial_execution(vcpu);

	default:

	default:

arch/s390/kvm/kvm-s390.c

+1 −0
Original line number Original line Diff line number Diff line
@@ -63,6 +63,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = { 
	{ "exit_instruction", VCPU_STAT(exit_instruction) },

	{ "exit_instruction", VCPU_STAT(exit_instruction) },

	{ "exit_program_interruption", VCPU_STAT(exit_program_interruption) },

	{ "exit_program_interruption", VCPU_STAT(exit_program_interruption) },

	{ "exit_instr_and_program_int", VCPU_STAT(exit_instr_and_program) },

	{ "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_successful_poll", VCPU_STAT(halt_successful_poll) },

	{ "halt_attempted_poll", VCPU_STAT(halt_attempted_poll) },

	{ "halt_attempted_poll", VCPU_STAT(halt_attempted_poll) },

	{ "halt_poll_invalid", VCPU_STAT(halt_poll_invalid) },

	{ "halt_poll_invalid", VCPU_STAT(halt_poll_invalid) },

arch/s390/kvm/trace.h

+21 −0
Original line number Original line Diff line number Diff line
@@ -412,6 +412,27 @@ TRACE_EVENT(kvm_s390_handle_stsi, 
			   __entry->addr)

			   __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 */

#endif /* _TRACE_KVM_H */





/* This part must be outside protection */

/* This part must be outside protection */