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1 | /* |
2 | * diag.c - handling diagnose instructions | |
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.h> | |
15 | #include <linux/kvm_host.h> | |
16 | #include "kvm-s390.h" | |
17 | ||
18 | static int __diag_time_slice_end(struct kvm_vcpu *vcpu) | |
19 | { | |
20 | VCPU_EVENT(vcpu, 5, "%s", "diag time slice end"); | |
21 | vcpu->stat.diagnose_44++; | |
22 | vcpu_put(vcpu); | |
b8cee18c | 23 | yield(); |
e28acfea CB |
24 | vcpu_load(vcpu); |
25 | return 0; | |
26 | } | |
27 | ||
28 | static int __diag_ipl_functions(struct kvm_vcpu *vcpu) | |
29 | { | |
30 | unsigned int reg = vcpu->arch.sie_block->ipa & 0xf; | |
31 | unsigned long subcode = vcpu->arch.guest_gprs[reg] & 0xffff; | |
32 | ||
33 | VCPU_EVENT(vcpu, 5, "diag ipl functions, subcode %lx", subcode); | |
34 | switch (subcode) { | |
35 | case 3: | |
36 | vcpu->run->s390_reset_flags = KVM_S390_RESET_CLEAR; | |
37 | break; | |
38 | case 4: | |
39 | vcpu->run->s390_reset_flags = 0; | |
40 | break; | |
41 | default: | |
42 | return -ENOTSUPP; | |
43 | } | |
44 | ||
45 | atomic_clear_mask(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags); | |
46 | vcpu->run->s390_reset_flags |= KVM_S390_RESET_SUBSYSTEM; | |
47 | vcpu->run->s390_reset_flags |= KVM_S390_RESET_IPL; | |
48 | vcpu->run->s390_reset_flags |= KVM_S390_RESET_CPU_INIT; | |
49 | vcpu->run->exit_reason = KVM_EXIT_S390_RESET; | |
50 | VCPU_EVENT(vcpu, 3, "requesting userspace resets %lx", | |
51 | vcpu->run->s390_reset_flags); | |
52 | return -EREMOTE; | |
53 | } | |
54 | ||
55 | int kvm_s390_handle_diag(struct kvm_vcpu *vcpu) | |
56 | { | |
57 | int code = (vcpu->arch.sie_block->ipb & 0xfff0000) >> 16; | |
58 | ||
59 | switch (code) { | |
60 | case 0x44: | |
61 | return __diag_time_slice_end(vcpu); | |
62 | case 0x308: | |
63 | return __diag_ipl_functions(vcpu); | |
64 | default: | |
65 | return -ENOTSUPP; | |
66 | } | |
67 | } |