On Fri, Feb 22, 2013 at 01:09:49PM +0100, Cornelia Huck wrote:
> Enable ioeventfd support on s390 and hook up diagnose 500 virtio-ccw
> notifications.
>
> Signed-off-by: Cornelia Huck <cornelia.huck@xxxxxxxxxx>
> ---
> arch/s390/kvm/Kconfig | 1 +
> arch/s390/kvm/Makefile | 2 +-
> arch/s390/kvm/diag.c | 25 +++++++++++++++++++++++++
> arch/s390/kvm/kvm-s390.c | 1 +
> 4 files changed, 28 insertions(+), 1 deletion(-)
>
> diff --git a/arch/s390/kvm/Kconfig b/arch/s390/kvm/Kconfig
> index b58dd86..3c43e30 100644
> --- a/arch/s390/kvm/Kconfig
> +++ b/arch/s390/kvm/Kconfig
> @@ -22,6 +22,7 @@ config KVM
> select PREEMPT_NOTIFIERS
> select ANON_INODES
> select HAVE_KVM_CPU_RELAX_INTERCEPT
> + select HAVE_KVM_EVENTFD
> ---help---
> Support hosting paravirtualized guest machines using the SIE
> virtualization capability on the mainframe. This should work
> diff --git a/arch/s390/kvm/Makefile b/arch/s390/kvm/Makefile
> index 3975722..8fe9d65 100644
> --- a/arch/s390/kvm/Makefile
> +++ b/arch/s390/kvm/Makefile
> @@ -6,7 +6,7 @@
> # it under the terms of the GNU General Public License (version 2 only)
> # as published by the Free Software Foundation.
>
> -common-objs = $(addprefix ../../../virt/kvm/, kvm_main.o)
> +common-objs = $(addprefix ../../../virt/kvm/, kvm_main.o eventfd.o)
>
> ccflags-y := -Ivirt/kvm -Iarch/s390/kvm
>
> diff --git a/arch/s390/kvm/diag.c b/arch/s390/kvm/diag.c
> index a390687..13cf74a 100644
> --- a/arch/s390/kvm/diag.c
> +++ b/arch/s390/kvm/diag.c
> @@ -104,6 +104,29 @@ static int __diag_ipl_functions(struct kvm_vcpu *vcpu)
> return -EREMOTE;
> }
>
> +static int __diag_virtio_hypercall(struct kvm_vcpu *vcpu)
> +{
> + int ret, idx;
> +
> + /* No virtio-ccw notification? Get out quickly. */
> + if (!vcpu->kvm->arch.css_support ||
> + (vcpu->run->s.regs.gprs[1] != 3))
> + return -EOPNOTSUPP;
Looks like we have:
arch/s390/include/uapi/asm/kvm_virtio.h:#define KVM_S390_VIRTIO_NOTIFY 0
arch/s390/include/uapi/asm/kvm_virtio.h:#define KVM_S390_VIRTIO_RESET 1
arch/s390/include/uapi/asm/kvm_virtio.h:#define KVM_S390_VIRTIO_SET_STATUS 2
KVM_S390_VIRTIO_CSS_NOTIFY is missing? Strange.
Maybe it should be added in that header and included here?
Do some guests use it?
Also, do you want to support KVM_S390_VIRTIO_NOTIFY as well?
> +
> + idx = srcu_read_lock(&vcpu->kvm->srcu);
> + /*
> + * The layout is as follows:
> + * - gpr 2 contains the subchannel id (passed as addr)
> + * - gpr 3 contains the virtqueue index (passed as datamatch)
> + */
> + ret = kvm_io_bus_write(vcpu->kvm, KVM_CSS_BUS,
> + vcpu->run->s.regs.gprs[2],
> + 8, &vcpu->run->s.regs.gprs[3]);
> + srcu_read_unlock(&vcpu->kvm->srcu, idx);
> + /* kvm_io_bus_write returns -EOPNOTSUPP if it found no match. */
> + return ret;
> +}
> +
> int kvm_s390_handle_diag(struct kvm_vcpu *vcpu)
> {
> int code = (vcpu->arch.sie_block->ipb & 0xfff0000) >> 16;
> @@ -118,6 +141,8 @@ int kvm_s390_handle_diag(struct kvm_vcpu *vcpu)
> return __diag_time_slice_end_directed(vcpu);
> case 0x308:
> return __diag_ipl_functions(vcpu);
> + case 0x500:
> + return __diag_virtio_hypercall(vcpu);
> default:
> return -EOPNOTSUPP;
> }
> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> index f822d36..04d2454 100644
> --- a/arch/s390/kvm/kvm-s390.c
> +++ b/arch/s390/kvm/kvm-s390.c
> @@ -142,6 +142,7 @@ int kvm_dev_ioctl_check_extension(long ext)
> case KVM_CAP_ONE_REG:
> case KVM_CAP_ENABLE_CAP:
> case KVM_CAP_S390_CSS_SUPPORT:
> + case KVM_CAP_IOEVENTFD:
> r = 1;
> break;
> case KVM_CAP_NR_VCPUS:
> --
> 1.7.12.4
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