diff options
Diffstat (limited to 'arch/powerpc/kvm/powerpc.c')
| -rw-r--r-- | arch/powerpc/kvm/powerpc.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index fecfe043458d..6a53a3f86dae 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -191,6 +191,7 @@ int kvm_dev_ioctl_check_extension(long ext) case KVM_CAP_PPC_UNSET_IRQ: case KVM_CAP_ENABLE_CAP: case KVM_CAP_PPC_OSI: + case KVM_CAP_PPC_GET_PVINFO: r = 1; break; case KVM_CAP_COALESCED_MMIO: @@ -578,16 +579,53 @@ out: return r; } +static int kvm_vm_ioctl_get_pvinfo(struct kvm_ppc_pvinfo *pvinfo) +{ + u32 inst_lis = 0x3c000000; + u32 inst_ori = 0x60000000; + u32 inst_nop = 0x60000000; + u32 inst_sc = 0x44000002; + u32 inst_imm_mask = 0xffff; + + /* + * The hypercall to get into KVM from within guest context is as + * follows: + * + * lis r0, r0, KVM_SC_MAGIC_R0@h + * ori r0, KVM_SC_MAGIC_R0@l + * sc + * nop + */ + pvinfo->hcall[0] = inst_lis | ((KVM_SC_MAGIC_R0 >> 16) & inst_imm_mask); + pvinfo->hcall[1] = inst_ori | (KVM_SC_MAGIC_R0 & inst_imm_mask); + pvinfo->hcall[2] = inst_sc; + pvinfo->hcall[3] = inst_nop; + + return 0; +} + long kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) { + void __user *argp = (void __user *)arg; long r; switch (ioctl) { + case KVM_PPC_GET_PVINFO: { + struct kvm_ppc_pvinfo pvinfo; + r = kvm_vm_ioctl_get_pvinfo(&pvinfo); + if (copy_to_user(argp, &pvinfo, sizeof(pvinfo))) { + r = -EFAULT; + goto out; + } + + break; + } default: r = -ENOTTY; } +out: return r; } |