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KVM: s390: allow user space to handle instr 0x0000

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We will use illegal instruction 0x0000 for handling 2 byte sw breakpoints
from user space. As it can be enabled dynamically via a capability,
let's move setting of ICTL_OPEREXC to the post creation step, so we avoid
any races when enabling that capability just while adding new cpus.

Acked-by: Janosch Frank <frankja@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
David Hildenbrand
2016-06-21 14:19:51 +02:00
committed by Christian Borntraeger
parent af1bae5497
commit 6502a34cfd
5 changed files with 43 additions and 2 deletions
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2
arch/s390/include/asm/kvm_host.h
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@@ -43,6 +43,7 @@
/* s390-specific vcpu->requests bit members */
#define KVM_REQ_ENABLE_IBS 8
#define KVM_REQ_DISABLE_IBS 9
#define KVM_REQ_ICPT_OPEREXC 10
#define SIGP_CTRL_C 0x80
#define SIGP_CTRL_SCN_MASK 0x3f
@@ -666,6 +667,7 @@ struct kvm_arch{
int user_cpu_state_ctrl;
int user_sigp;
int user_stsi;
int user_instr0;
struct s390_io_adapter *adapters[MAX_S390_IO_ADAPTERS];
wait_queue_head_t ipte_wq;
int ipte_lock_count;