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KVM: s390: Add support for channel I/O instructions.

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Add a new capability, KVM_CAP_S390_CSS_SUPPORT, which will pass
intercepts for channel I/O instructions to userspace. Only I/O
instructions interacting with I/O interrupts need to be handled
in-kernel:

- TEST PENDING INTERRUPTION (tpi) dequeues and stores pending
  interrupts entirely in-kernel.
- TEST SUBCHANNEL (tsch) dequeues pending interrupts in-kernel
  and exits via KVM_EXIT_S390_TSCH to userspace for subchannel-
  related processing.

Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
Reviewed-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Cornelia Huck 2012-12-20 15:32:12 +01:00 • committed by Marcelo Tosatti
commit fa6b7fe992
10 changed files with 202 additions and 5 deletions
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11
include/uapi/linux/kvm.h
View file

@ -168,6 +168,7 @@ struct kvm_pit_config {
#define KVM_EXIT_PAPR_HCALL 19
#define KVM_EXIT_S390_UCONTROL 20
#define KVM_EXIT_WATCHDOG 21
#define KVM_EXIT_S390_TSCH 22
/* For KVM_EXIT_INTERNAL_ERROR */
/* Emulate instruction failed. */
@ -285,6 +286,15 @@ struct kvm_run {
__u64 ret;
__u64 args[9];
} papr_hcall;
/* KVM_EXIT_S390_TSCH */
struct {
__u16 subchannel_id;
__u16 subchannel_nr;
__u32 io_int_parm;
__u32 io_int_word;
__u32 ipb;
__u8 dequeued;
} s390_tsch;
/* Fix the size of the union. */
char padding[256];
};
@ -645,6 +655,7 @@ struct kvm_ppc_smmu_info {
#define KVM_CAP_IRQFD_RESAMPLE 82
#define KVM_CAP_PPC_BOOKE_WATCHDOG 83
#define KVM_CAP_PPC_HTAB_FD 84
#define KVM_CAP_S390_CSS_SUPPORT 85
#ifdef KVM_CAP_IRQ_ROUTING