From 519783935451764b397f2a712de5ea778ff77fdf Mon Sep 17 00:00:00 2001 From: Fei Li Date: Fri, 17 Feb 2017 17:06:26 +0800 Subject: 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 Signed-off-by: Yi Min Zhao Signed-off-by: Fei Li Reviewed-by: Cornelia Huck Signed-off-by: Christian Borntraeger --- arch/s390/include/uapi/asm/kvm.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'arch/s390/include/uapi/asm/kvm.h') diff --git a/arch/s390/include/uapi/asm/kvm.h b/arch/s390/include/uapi/asm/kvm.h index 5fa144d1df0a..50d2a927c990 100644 --- a/arch/s390/include/uapi/asm/kvm.h +++ b/arch/s390/include/uapi/asm/kvm.h @@ -26,6 +26,7 @@ #define KVM_DEV_FLIC_ADAPTER_REGISTER 6 #define KVM_DEV_FLIC_ADAPTER_MODIFY 7 #define KVM_DEV_FLIC_CLEAR_IO_IRQ 8 +#define KVM_DEV_FLIC_AISM 9 /* * We can have up to 4*64k pending subchannels + 8 adapter interrupts, * as well as up to ASYNC_PF_PER_VCPU*KVM_MAX_VCPUS pfault done interrupts. @@ -46,6 +47,11 @@ struct kvm_s390_io_adapter { #define KVM_S390_ADAPTER_SUPPRESSIBLE 0x01 +struct kvm_s390_ais_req { + __u8 isc; + __u16 mode; +}; + #define KVM_S390_IO_ADAPTER_MASK 1 #define KVM_S390_IO_ADAPTER_MAP 2 #define KVM_S390_IO_ADAPTER_UNMAP 3 -- cgit v1.2.3