diff options
| -rw-r--r-- | Documentation/kvm/api.txt | 23 | ||||
| -rw-r--r-- | arch/powerpc/kvm/powerpc.c | 38 | ||||
| -rw-r--r-- | include/linux/kvm.h | 11 |
3 files changed, 72 insertions, 0 deletions
diff --git a/Documentation/kvm/api.txt b/Documentation/kvm/api.txt index 5f5b64982b1..44d9893f9db 100644 --- a/Documentation/kvm/api.txt +++ b/Documentation/kvm/api.txt @@ -1032,6 +1032,29 @@ are defined as follows: eax, ebx, ecx, edx: the values returned by the cpuid instruction for this function/index combination +4.46 KVM_PPC_GET_PVINFO + +Capability: KVM_CAP_PPC_GET_PVINFO +Architectures: ppc +Type: vm ioctl +Parameters: struct kvm_ppc_pvinfo (out) +Returns: 0 on success, !0 on error + +struct kvm_ppc_pvinfo { + __u32 flags; + __u32 hcall[4]; + __u8 pad[108]; +}; + +This ioctl fetches PV specific information that need to be passed to the guest +using the device tree or other means from vm context. + +For now the only implemented piece of information distributed here is an array +of 4 instructions that make up a hypercall. + +If any additional field gets added to this structure later on, a bit for that +additional piece of information will be set in the flags bitmap. + 5. The kvm_run structure Application code obtains a pointer to the kvm_run structure by diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index fecfe043458..6a53a3f86da 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; } diff --git a/include/linux/kvm.h b/include/linux/kvm.h index 636fc381c89..37077045970 100644 --- a/include/linux/kvm.h +++ b/include/linux/kvm.h @@ -414,6 +414,14 @@ struct kvm_enable_cap { __u8 pad[64]; }; +/* for KVM_PPC_GET_PVINFO */ +struct kvm_ppc_pvinfo { + /* out */ + __u32 flags; + __u32 hcall[4]; + __u8 pad[108]; +}; + #define KVMIO 0xAE /* @@ -530,6 +538,7 @@ struct kvm_enable_cap { #ifdef __KVM_HAVE_XCRS #define KVM_CAP_XCRS 56 #endif +#define KVM_CAP_PPC_GET_PVINFO 57 #ifdef KVM_CAP_IRQ_ROUTING @@ -664,6 +673,8 @@ struct kvm_clock_data { /* Available with KVM_CAP_PIT_STATE2 */ #define KVM_GET_PIT2 _IOR(KVMIO, 0x9f, struct kvm_pit_state2) #define KVM_SET_PIT2 _IOW(KVMIO, 0xa0, struct kvm_pit_state2) +/* Available with KVM_CAP_PPC_GET_PVINFO */ +#define KVM_PPC_GET_PVINFO _IOW(KVMIO, 0xa1, struct kvm_ppc_pvinfo) /* * ioctls for vcpu fds |