diff options
Diffstat (limited to 'arch/s390/kvm/kvm-s390.c')
-rw-r--r-- | arch/s390/kvm/kvm-s390.c | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 1d00aead6bc5..37be2a33edb5 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -5096,6 +5096,48 @@ long kvm_arch_vcpu_async_ioctl(struct file *filp, return -ENOIOCTLCMD; } +static int kvm_s390_handle_pv_vcpu_dump(struct kvm_vcpu *vcpu, + struct kvm_pv_cmd *cmd) +{ + struct kvm_s390_pv_dmp dmp; + void *data; + int ret; + + /* Dump initialization is a prerequisite */ + if (!vcpu->kvm->arch.pv.dumping) + return -EINVAL; + + if (copy_from_user(&dmp, (__u8 __user *)cmd->data, sizeof(dmp))) + return -EFAULT; + + /* We only handle this subcmd right now */ + if (dmp.subcmd != KVM_PV_DUMP_CPU) + return -EINVAL; + + /* CPU dump length is the same as create cpu storage donation. */ + if (dmp.buff_len != uv_info.guest_cpu_stor_len) + return -EINVAL; + + data = kvzalloc(uv_info.guest_cpu_stor_len, GFP_KERNEL); + if (!data) + return -ENOMEM; + + ret = kvm_s390_pv_dump_cpu(vcpu, data, &cmd->rc, &cmd->rrc); + + VCPU_EVENT(vcpu, 3, "PROTVIRT DUMP CPU %d rc %x rrc %x", + vcpu->vcpu_id, cmd->rc, cmd->rrc); + + if (ret) + ret = -EINVAL; + + /* On success copy over the dump data */ + if (!ret && copy_to_user((__u8 __user *)dmp.buff_addr, data, uv_info.guest_cpu_stor_len)) + ret = -EFAULT; + + kvfree(data); + return ret; +} + long kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) { @@ -5260,6 +5302,33 @@ long kvm_arch_vcpu_ioctl(struct file *filp, irq_state.len); break; } + case KVM_S390_PV_CPU_COMMAND: { + struct kvm_pv_cmd cmd; + + r = -EINVAL; + if (!is_prot_virt_host()) + break; + + r = -EFAULT; + if (copy_from_user(&cmd, argp, sizeof(cmd))) + break; + + r = -EINVAL; + if (cmd.flags) + break; + + /* We only handle this cmd right now */ + if (cmd.cmd != KVM_PV_DUMP) + break; + + r = kvm_s390_handle_pv_vcpu_dump(vcpu, &cmd); + + /* Always copy over UV rc / rrc data */ + if (copy_to_user((__u8 __user *)argp, &cmd.rc, + sizeof(cmd.rc) + sizeof(cmd.rrc))) + r = -EFAULT; + break; + } default: r = -ENOTTY; } |