On Mon, 12 Nov 2012 23:17:55 -0200
Marcelo Tosatti <mtosatti@xxxxxxxxxx> wrote:
> 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?
Old code leftovers; I've removed it.
>
> > +
> > + cap.cap = KVM_CAP_S390_CSS_SUPPORT;
> > + r = kvm_vcpu_ioctl(env, KVM_ENABLE_CAP, &cap);
> > + assert(r == 0);
> > + }
> > +}
>
>
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