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| author | Cornelia Huck | 2012-12-20 15:32:12 +0100 |
|---|---|---|
| committer | Marcelo Tosatti | 2013-01-07 22:53:43 +0100 |
| commit | fa6b7fe9928d50444c29b29c8563746c6b0c6299 (patch) | |
| tree | 0be284cf322eb82eefdb3df2743740e5578ba5c4 /arch/s390/kvm/kvm-s390.c | |
| parent | KVM: s390: Base infrastructure for enabling capabilities. (diff) | |
| download | kernel-qcow2-linux-fa6b7fe9928d50444c29b29c8563746c6b0c6299.tar.gz kernel-qcow2-linux-fa6b7fe9928d50444c29b29c8563746c6b0c6299.tar.xz kernel-qcow2-linux-fa6b7fe9928d50444c29b29c8563746c6b0c6299.zip | |
KVM: s390: Add support for channel I/O instructions.
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>
Diffstat (limited to 'arch/s390/kvm/kvm-s390.c')
| -rw-r--r-- | arch/s390/kvm/kvm-s390.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 5ff26033825c..5b01f0953900 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -141,6 +141,7 @@ int kvm_dev_ioctl_check_extension(long ext) case KVM_CAP_SYNC_REGS: case KVM_CAP_ONE_REG: case KVM_CAP_ENABLE_CAP: + case KVM_CAP_S390_CSS_SUPPORT: r = 1; break; case KVM_CAP_NR_VCPUS: @@ -235,6 +236,9 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) if (!kvm->arch.gmap) goto out_nogmap; } + + kvm->arch.css_support = 0; + return 0; out_nogmap: debug_unregister(kvm->arch.dbf); @@ -658,6 +662,7 @@ rerun_vcpu: case KVM_EXIT_INTR: case KVM_EXIT_S390_RESET: case KVM_EXIT_S390_UCONTROL: + case KVM_EXIT_S390_TSCH: break; default: BUG(); @@ -818,6 +823,13 @@ static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu, return -EINVAL; switch (cap->cap) { + case KVM_CAP_S390_CSS_SUPPORT: + if (!vcpu->kvm->arch.css_support) { + vcpu->kvm->arch.css_support = 1; + trace_kvm_s390_enable_css(vcpu->kvm); + } + r = 0; + break; default: r = -EINVAL; break; |