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author | Fei Li <sherrylf@linux.vnet.ibm.com> | 2017-02-17 17:06:26 +0800 |
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committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2017-04-06 13:15:36 +0200 |
commit | 519783935451764b397f2a712de5ea778ff77fdf (patch) | |
tree | 599467b03f2ff2680b4de7b494b1bfaccd37f859 /arch/s390/include/asm/kvm_host.h | |
parent | 08fab50da669e5ee5a542592895fcb63be3cd7b1 (diff) | |
download | op-kernel-dev-519783935451764b397f2a712de5ea778ff77fdf.zip op-kernel-dev-519783935451764b397f2a712de5ea778ff77fdf.tar.gz |
KVM: s390: introduce ais mode modify function
Provide an interface for userspace to modify AIS
(adapter-interruption-suppression) mode state, and add documentation
for the interface. Allowed target modes are ALL-Interruptions mode
and SINGLE-Interruption mode.
We introduce the 'simm' and 'nimm' fields in kvm_s390_float_interrupt
to store interruption modes for each ISC. Each bit in 'simm' and
'nimm' targets to one ISC, and collaboratively indicate three modes:
ALL-Interruptions, SINGLE-Interruption and NO-Interruptions. This
interface can initiate most transitions between the states; transition
from SINGLE-Interruption to NO-Interruptions via adapter interrupt
injection will be introduced in a following patch. The meaningful
combinations are as follows:
interruption mode | simm bit | nimm bit
------------------|----------|----------
ALL | 0 | 0
SINGLE | 1 | 0
NO | 1 | 1
Besides, add tracepoint to track AIS mode transitions.
Co-Authored-By: Yi Min Zhao <zyimin@linux.vnet.ibm.com>
Signed-off-by: Yi Min Zhao <zyimin@linux.vnet.ibm.com>
Signed-off-by: Fei Li <sherrylf@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.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 | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h index 499c72c..552c319 100644 --- a/arch/s390/include/asm/kvm_host.h +++ b/arch/s390/include/asm/kvm_host.h @@ -521,6 +521,12 @@ struct kvm_s390_local_interrupt { #define FIRQ_CNTR_PFAULT 3 #define FIRQ_MAX_COUNT 4 +/* mask the AIS mode for a given ISC */ +#define AIS_MODE_MASK(isc) (0x80 >> isc) + +#define KVM_S390_AIS_MODE_ALL 0 +#define KVM_S390_AIS_MODE_SINGLE 1 + struct kvm_s390_float_interrupt { unsigned long pending_irqs; spinlock_t lock; @@ -530,6 +536,10 @@ struct kvm_s390_float_interrupt { struct kvm_s390_ext_info srv_signal; int next_rr_cpu; unsigned long idle_mask[BITS_TO_LONGS(KVM_MAX_VCPUS)]; + struct mutex ais_lock; + u8 simm; + u8 nimm; + int ais_enabled; }; struct kvm_hw_wp_info_arch { |