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Commit 58bc33b2 authored by Thomas Huth's avatar Thomas Huth Committed by Cornelia Huck
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KVM: s390: SIGP START has to report BUSY while stopping a CPU 



Just like the RESTART order, the START order also has to report BUSY
while a STOP request is pending, to avoid that the START might be
ignored due to a race condition between the STOP and the START order.

Signed-off-by: default avatarThomas Huth <thuth@linux.vnet.ibm.com>
Reviewed-by: default avatarCornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: default avatarCornelia Huck <cornelia.huck@de.ibm.com>
parent cc92d6de

arch/s390/include/asm/sigp.h

+1 −0
Original line number Diff line number Diff line
@@ -5,6 +5,7 @@ 
#define SIGP_SENSE		      1

#define SIGP_EXTERNAL_CALL	      2

#define SIGP_EMERGENCY_SIGNAL	      3

#define SIGP_START		      4

#define SIGP_STOP		      5

#define SIGP_RESTART		      6

#define SIGP_STOP_AND_STORE_STATUS    9

arch/s390/kvm/sigp.c

+5 −0
Original line number Diff line number Diff line
@@ -455,6 +455,11 @@ int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu) 
		rc = __sigp_sense_running(vcpu, cpu_addr,

					  &vcpu->run->s.regs.gprs[r1]);

		break;

	case SIGP_START:

		rc = sigp_check_callable(vcpu, cpu_addr);

		if (rc == SIGP_CC_ORDER_CODE_ACCEPTED)

			rc = -EOPNOTSUPP;    /* Handle START in user space */

		break;

	case SIGP_RESTART:

		vcpu->stat.instruction_sigp_restart++;

		rc = sigp_check_callable(vcpu, cpu_addr);