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author | David Hildenbrand <dahi@linux.vnet.ibm.com> | 2014-10-09 14:10:13 +0200 |
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committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2015-01-23 13:25:37 +0100 |
commit | 2444b352c3acf54897b0e2803a7c4e66699f9f43 (patch) | |
tree | 42490c1860791c4d674fe8c40aaf77c4d0407ab7 /arch/s390/include/asm/kvm_host.h | |
parent | 9fbd80828cef1b1bba5a293609a021047bb86a7e (diff) | |
download | op-kernel-dev-2444b352c3acf54897b0e2803a7c4e66699f9f43.zip op-kernel-dev-2444b352c3acf54897b0e2803a7c4e66699f9f43.tar.gz |
KVM: s390: forward most SIGP orders to user space
Most SIGP orders are handled partially in kernel and partially in
user space. In order to:
- Get a correct SIGP SET PREFIX handler that informs user space
- Avoid race conditions between concurrently executed SIGP orders
- Serialize SIGP orders per VCPU
We need to handle all "slow" SIGP orders in user space. The remaining
ones to be handled completely in kernel are:
- SENSE
- SENSE RUNNING
- EXTERNAL CALL
- EMERGENCY SIGNAL
- CONDITIONAL EMERGENCY SIGNAL
According to the PoP, they have to be fast. They can be executed
without conflicting to the actions of other pending/concurrently
executing orders (e.g. STOP vs. START).
This patch introduces a new capability that will - when enabled -
forward all but the mentioned SIGP orders to user space. The
instruction counters in the kernel are still updated.
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>
Diffstat (limited to 'arch/s390/include/asm/kvm_host.h')
-rw-r--r-- | arch/s390/include/asm/kvm_host.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h index b617052..a2dcd0e 100644 --- a/arch/s390/include/asm/kvm_host.h +++ b/arch/s390/include/asm/kvm_host.h @@ -521,6 +521,7 @@ struct kvm_arch{ int use_irqchip; int use_cmma; int user_cpu_state_ctrl; + int user_sigp; struct s390_io_adapter *adapters[MAX_S390_IO_ADAPTERS]; wait_queue_head_t ipte_wq; int ipte_lock_count; |