2 * handling diagnose instructions
4 * Copyright IBM Corp. 2008, 2011
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.
10 * Author(s): Carsten Otte <cotte@de.ibm.com>
11 * Christian Borntraeger <borntraeger@de.ibm.com>
14 #include <linux/kvm.h>
15 #include <linux/kvm_host.h>
18 static int diag_release_pages(struct kvm_vcpu
*vcpu
)
20 unsigned long start
, end
;
21 unsigned long prefix
= vcpu
->arch
.sie_block
->prefix
;
23 start
= vcpu
->run
->s
.regs
.gprs
[(vcpu
->arch
.sie_block
->ipa
& 0xf0) >> 4];
24 end
= vcpu
->run
->s
.regs
.gprs
[vcpu
->arch
.sie_block
->ipa
& 0xf] + 4096;
26 if (start
& ~PAGE_MASK
|| end
& ~PAGE_MASK
|| start
> end
27 || start
< 2 * PAGE_SIZE
)
28 return kvm_s390_inject_program_int(vcpu
, PGM_SPECIFICATION
);
30 VCPU_EVENT(vcpu
, 5, "diag release pages %lX %lX", start
, end
);
31 vcpu
->stat
.diagnose_10
++;
33 /* we checked for start > end above */
34 if (end
< prefix
|| start
>= prefix
+ 2 * PAGE_SIZE
) {
35 gmap_discard(start
, end
, vcpu
->arch
.gmap
);
38 gmap_discard(start
, prefix
, vcpu
->arch
.gmap
);
40 gmap_discard(prefix
+ 2 * PAGE_SIZE
,
41 end
, vcpu
->arch
.gmap
);
46 static int __diag_time_slice_end(struct kvm_vcpu
*vcpu
)
48 VCPU_EVENT(vcpu
, 5, "%s", "diag time slice end");
49 vcpu
->stat
.diagnose_44
++;
50 kvm_vcpu_on_spin(vcpu
);
54 static int __diag_time_slice_end_directed(struct kvm_vcpu
*vcpu
)
56 struct kvm
*kvm
= vcpu
->kvm
;
57 struct kvm_vcpu
*tcpu
;
61 tid
= vcpu
->run
->s
.regs
.gprs
[(vcpu
->arch
.sie_block
->ipa
& 0xf0) >> 4];
62 vcpu
->stat
.diagnose_9c
++;
63 VCPU_EVENT(vcpu
, 5, "diag time slice end directed to %d", tid
);
65 if (tid
== vcpu
->vcpu_id
)
68 kvm_for_each_vcpu(i
, tcpu
, kvm
)
69 if (tcpu
->vcpu_id
== tid
) {
70 kvm_vcpu_yield_to(tcpu
);
77 static int __diag_ipl_functions(struct kvm_vcpu
*vcpu
)
79 unsigned int reg
= vcpu
->arch
.sie_block
->ipa
& 0xf;
80 unsigned long subcode
= vcpu
->run
->s
.regs
.gprs
[reg
] & 0xffff;
82 VCPU_EVENT(vcpu
, 5, "diag ipl functions, subcode %lx", subcode
);
85 vcpu
->run
->s390_reset_flags
= KVM_S390_RESET_CLEAR
;
88 vcpu
->run
->s390_reset_flags
= 0;
94 atomic_set_mask(CPUSTAT_STOPPED
, &vcpu
->arch
.sie_block
->cpuflags
);
95 vcpu
->run
->s390_reset_flags
|= KVM_S390_RESET_SUBSYSTEM
;
96 vcpu
->run
->s390_reset_flags
|= KVM_S390_RESET_IPL
;
97 vcpu
->run
->s390_reset_flags
|= KVM_S390_RESET_CPU_INIT
;
98 vcpu
->run
->exit_reason
= KVM_EXIT_S390_RESET
;
99 VCPU_EVENT(vcpu
, 3, "requesting userspace resets %llx",
100 vcpu
->run
->s390_reset_flags
);
104 int kvm_s390_handle_diag(struct kvm_vcpu
*vcpu
)
106 int code
= (vcpu
->arch
.sie_block
->ipb
& 0xfff0000) >> 16;
110 return diag_release_pages(vcpu
);
112 return __diag_time_slice_end(vcpu
);
114 return __diag_time_slice_end_directed(vcpu
);
116 return __diag_ipl_functions(vcpu
);
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