diff options
Diffstat (limited to 'arch/powerpc/kvm/powerpc.c')
| -rw-r--r-- | arch/powerpc/kvm/powerpc.c | 81 |
1 files changed, 60 insertions, 21 deletions
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index 2ad0ccd202d5..9772b176e406 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -307,9 +307,31 @@ int kvmppc_emulate_mmio(struct kvm_vcpu *vcpu) u32 last_inst; kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst); - /* XXX Deliver Program interrupt to guest. */ - pr_emerg("%s: emulation failed (%08x)\n", __func__, last_inst); - r = RESUME_HOST; + kvm_debug_ratelimited("Guest access to device memory using unsupported instruction (opcode: %#08x)\n", + last_inst); + + /* + * Injecting a Data Storage here is a bit more + * accurate since the instruction that caused the + * access could still be a valid one. + */ + if (!IS_ENABLED(CONFIG_BOOKE)) { + ulong dsisr = DSISR_BADACCESS; + + if (vcpu->mmio_is_write) + dsisr |= DSISR_ISSTORE; + + kvmppc_core_queue_data_storage(vcpu, vcpu->arch.vaddr_accessed, dsisr); + } else { + /* + * BookE does not send a SIGBUS on a bad + * fault, so use a Program interrupt instead + * to avoid a fault loop. + */ + kvmppc_core_queue_program(vcpu, 0); + } + + r = RESUME_GUEST; break; } default: @@ -431,6 +453,8 @@ int kvm_arch_check_processor_compat(void *opaque) int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) { struct kvmppc_ops *kvm_ops = NULL; + int r; + /* * if we have both HV and PR enabled, default is HV */ @@ -452,11 +476,14 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) } else goto err_out; - if (kvm_ops->owner && !try_module_get(kvm_ops->owner)) + if (!try_module_get(kvm_ops->owner)) return -ENOENT; kvm->arch.kvm_ops = kvm_ops; - return kvmppc_core_init_vm(kvm); + r = kvmppc_core_init_vm(kvm); + if (r) + module_put(kvm_ops->owner); + return r; err_out: return -EINVAL; } @@ -755,7 +782,6 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu) rcuwait_init(&vcpu->arch.wait); vcpu->arch.waitp = &vcpu->arch.wait; - kvmppc_create_vcpu_debugfs(vcpu, vcpu->vcpu_id); return 0; out_vcpu_uninit: @@ -772,8 +798,6 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) /* Make sure we're not using the vcpu anymore */ hrtimer_cancel(&vcpu->arch.dec_timer); - kvmppc_remove_vcpu_debugfs(vcpu); - switch (vcpu->arch.irq_type) { case KVMPPC_IRQ_MPIC: kvmppc_mpic_disconnect_vcpu(vcpu->arch.mpic, vcpu); @@ -1114,10 +1138,8 @@ static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu) struct kvm_run *run = vcpu->run; u64 gpr; - if (run->mmio.len > sizeof(gpr)) { - printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len); + if (run->mmio.len > sizeof(gpr)) return; - } if (!vcpu->arch.mmio_host_swabbed) { switch (run->mmio.len) { @@ -1236,10 +1258,8 @@ static int __kvmppc_handle_load(struct kvm_vcpu *vcpu, host_swabbed = !is_default_endian; } - if (bytes > sizeof(run->mmio.data)) { - printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__, - run->mmio.len); - } + if (bytes > sizeof(run->mmio.data)) + return EMULATE_FAIL; run->mmio.phys_addr = vcpu->arch.paddr_accessed; run->mmio.len = bytes; @@ -1325,10 +1345,8 @@ int kvmppc_handle_store(struct kvm_vcpu *vcpu, host_swabbed = !is_default_endian; } - if (bytes > sizeof(run->mmio.data)) { - printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__, - run->mmio.len); - } + if (bytes > sizeof(run->mmio.data)) + return EMULATE_FAIL; run->mmio.phys_addr = vcpu->arch.paddr_accessed; run->mmio.len = bytes; @@ -1499,7 +1517,7 @@ int kvmppc_handle_vmx_load(struct kvm_vcpu *vcpu, { enum emulation_result emulated = EMULATE_DONE; - if (vcpu->arch.mmio_vsx_copy_nums > 2) + if (vcpu->arch.mmio_vmx_copy_nums > 2) return EMULATE_FAIL; while (vcpu->arch.mmio_vmx_copy_nums) { @@ -1596,7 +1614,7 @@ int kvmppc_handle_vmx_store(struct kvm_vcpu *vcpu, unsigned int index = rs & KVM_MMIO_REG_MASK; enum emulation_result emulated = EMULATE_DONE; - if (vcpu->arch.mmio_vsx_copy_nums > 2) + if (vcpu->arch.mmio_vmx_copy_nums > 2) return EMULATE_FAIL; vcpu->arch.io_gpr = rs; @@ -1841,6 +1859,14 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu) #ifdef CONFIG_ALTIVEC out: #endif + + /* + * We're already returning to userspace, don't pass the + * RESUME_HOST flags along. + */ + if (r > 0) + r = 0; + vcpu_put(vcpu); return r; } @@ -2497,3 +2523,16 @@ int kvm_arch_init(void *opaque) } EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_ppc_instr); + +void kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu, struct dentry *debugfs_dentry) +{ + if (vcpu->kvm->arch.kvm_ops->create_vcpu_debugfs) + vcpu->kvm->arch.kvm_ops->create_vcpu_debugfs(vcpu, debugfs_dentry); +} + +int kvm_arch_create_vm_debugfs(struct kvm *kvm) +{ + if (kvm->arch.kvm_ops->create_vm_debugfs) + kvm->arch.kvm_ops->create_vm_debugfs(kvm); + return 0; +} |