2 * diag.c - 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);