| Christian Borntraeger | 8f2abe6 | 2008-03-25 18:47:23 +0100 | [diff] [blame^] | 1 | /* |
| 2 | * intercept.c - in-kernel handling for sie intercepts |
| 3 | * |
| 4 | * Copyright IBM Corp. 2008 |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License (version 2 only) |
| 8 | * as published by the Free Software Foundation. |
| 9 | * |
| 10 | * Author(s): Carsten Otte <cotte@de.ibm.com> |
| 11 | * Christian Borntraeger <borntraeger@de.ibm.com> |
| 12 | */ |
| 13 | |
| 14 | #include <linux/kvm_host.h> |
| 15 | #include <linux/errno.h> |
| 16 | #include <linux/pagemap.h> |
| 17 | |
| 18 | #include <asm/kvm_host.h> |
| 19 | |
| 20 | #include "kvm-s390.h" |
| 21 | |
| 22 | static int handle_noop(struct kvm_vcpu *vcpu) |
| 23 | { |
| 24 | switch (vcpu->arch.sie_block->icptcode) { |
| 25 | case 0x10: |
| 26 | vcpu->stat.exit_external_request++; |
| 27 | break; |
| 28 | case 0x14: |
| 29 | vcpu->stat.exit_external_interrupt++; |
| 30 | break; |
| 31 | default: |
| 32 | break; /* nothing */ |
| 33 | } |
| 34 | return 0; |
| 35 | } |
| 36 | |
| 37 | static int handle_stop(struct kvm_vcpu *vcpu) |
| 38 | { |
| 39 | vcpu->stat.exit_stop_request++; |
| 40 | VCPU_EVENT(vcpu, 3, "%s", "cpu stopped"); |
| 41 | atomic_clear_mask(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags); |
| 42 | return -ENOTSUPP; |
| 43 | } |
| 44 | |
| 45 | static int handle_validity(struct kvm_vcpu *vcpu) |
| 46 | { |
| 47 | int viwhy = vcpu->arch.sie_block->ipb >> 16; |
| 48 | vcpu->stat.exit_validity++; |
| 49 | if (viwhy == 0x37) { |
| 50 | fault_in_pages_writeable((char __user *) |
| 51 | vcpu->kvm->arch.guest_origin + |
| 52 | vcpu->arch.sie_block->prefix, |
| 53 | PAGE_SIZE); |
| 54 | return 0; |
| 55 | } |
| 56 | VCPU_EVENT(vcpu, 2, "unhandled validity intercept code %d", |
| 57 | viwhy); |
| 58 | return -ENOTSUPP; |
| 59 | } |
| 60 | |
| 61 | static const intercept_handler_t intercept_funcs[0x48 >> 2] = { |
| 62 | [0x00 >> 2] = handle_noop, |
| 63 | [0x10 >> 2] = handle_noop, |
| 64 | [0x14 >> 2] = handle_noop, |
| 65 | [0x20 >> 2] = handle_validity, |
| 66 | [0x28 >> 2] = handle_stop, |
| 67 | }; |
| 68 | |
| 69 | int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu) |
| 70 | { |
| 71 | intercept_handler_t func; |
| 72 | u8 code = vcpu->arch.sie_block->icptcode; |
| 73 | |
| 74 | if (code & 3 || code > 0x48) |
| 75 | return -ENOTSUPP; |
| 76 | func = intercept_funcs[code >> 2]; |
| 77 | if (func) |
| 78 | return func(vcpu); |
| 79 | return -ENOTSUPP; |
| 80 | } |