Hi Cornelia,
On Wed, Oct 31, 2012 at 05:24:47PM +0100, Cornelia Huck wrote:
> Provide a mechanism for qemu to provide fully virtual subchannels to
> the guest. In the KVM case, this relies on the kernel's css support
> for I/O and machine check interrupt handling. The !KVM case handles
> interrupts on its own.
>
> Signed-off-by: Cornelia Huck <cornelia.huck@xxxxxxxxxx>
> ---
> hw/s390x/Makefile.objs | 1 +
> hw/s390x/css.c | 1209 ++++++++++++++++++++++++++++++++++++++++++++
> hw/s390x/css.h | 90 ++++
> target-s390x/Makefile.objs | 2 +-
> target-s390x/cpu.h | 232 +++++++++
> target-s390x/helper.c | 146 ++++++
> target-s390x/ioinst.c | 737 +++++++++++++++++++++++++++
> target-s390x/ioinst.h | 213 ++++++++
> target-s390x/kvm.c | 251 ++++++++-
> target-s390x/misc_helper.c | 6 +-
> 10 files changed, 2872 insertions(+), 15 deletions(-)
> create mode 100644 hw/s390x/css.c
> create mode 100644 hw/s390x/css.h
> create mode 100644 target-s390x/ioinst.c
> create mode 100644 target-s390x/ioinst.h
> +void kvm_s390_enable_css_support(CPUS390XState *env)
> +{
> + struct kvm_enable_cap cap = {};
> + int r;
> +
> + /* Activate host kernel channel subsystem support. */
> + if (kvm_enabled()) {
> + /* One CPU has to run */
> + s390_add_running_cpu(env);
Care to explain this?
> +
> + cap.cap = KVM_CAP_S390_CSS_SUPPORT;
> + r = kvm_vcpu_ioctl(env, KVM_ENABLE_CAP, &cap);
> + assert(r == 0);
> + }
> +}
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