projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 8f2abe6a CB |
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 | } |