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>
16 #include <asm/virtio-ccw.h>
19 #include "trace-s390.h"
21 static int diag_release_pages(struct kvm_vcpu *vcpu)
23 unsigned long start, end;
24 unsigned long prefix = vcpu->arch.sie_block->prefix;
26 start = vcpu->run->s.regs.gprs[(vcpu->arch.sie_block->ipa & 0xf0) >> 4];
27 end = vcpu->run->s.regs.gprs[vcpu->arch.sie_block->ipa & 0xf] + 4096;
29 if (start & ~PAGE_MASK || end & ~PAGE_MASK || start > end
30 || start < 2 * PAGE_SIZE)
31 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
33 VCPU_EVENT(vcpu, 5, "diag release pages %lX %lX", start, end);
34 vcpu->stat.diagnose_10++;
36 /* we checked for start > end above */
37 if (end < prefix || start >= prefix + 2 * PAGE_SIZE) {
38 gmap_discard(start, end, vcpu->arch.gmap);
41 gmap_discard(start, prefix, vcpu->arch.gmap);
43 gmap_discard(prefix + 2 * PAGE_SIZE,
44 end, vcpu->arch.gmap);
49 static int __diag_time_slice_end(struct kvm_vcpu *vcpu)
51 VCPU_EVENT(vcpu, 5, "%s", "diag time slice end");
52 vcpu->stat.diagnose_44++;
53 kvm_vcpu_on_spin(vcpu);
57 static int __diag_time_slice_end_directed(struct kvm_vcpu *vcpu)
59 struct kvm *kvm = vcpu->kvm;
60 struct kvm_vcpu *tcpu;
64 tid = vcpu->run->s.regs.gprs[(vcpu->arch.sie_block->ipa & 0xf0) >> 4];
65 vcpu->stat.diagnose_9c++;
66 VCPU_EVENT(vcpu, 5, "diag time slice end directed to %d", tid);
68 if (tid == vcpu->vcpu_id)
71 kvm_for_each_vcpu(i, tcpu, kvm)
72 if (tcpu->vcpu_id == tid) {
73 kvm_vcpu_yield_to(tcpu);
80 static int __diag_ipl_functions(struct kvm_vcpu *vcpu)
82 unsigned int reg = vcpu->arch.sie_block->ipa & 0xf;
83 unsigned long subcode = vcpu->run->s.regs.gprs[reg] & 0xffff;
85 VCPU_EVENT(vcpu, 5, "diag ipl functions, subcode %lx", subcode);
88 vcpu->run->s390_reset_flags = KVM_S390_RESET_CLEAR;
91 vcpu->run->s390_reset_flags = 0;
97 atomic_set_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
98 vcpu->run->s390_reset_flags |= KVM_S390_RESET_SUBSYSTEM;
99 vcpu->run->s390_reset_flags |= KVM_S390_RESET_IPL;
100 vcpu->run->s390_reset_flags |= KVM_S390_RESET_CPU_INIT;
101 vcpu->run->exit_reason = KVM_EXIT_S390_RESET;
102 VCPU_EVENT(vcpu, 3, "requesting userspace resets %llx",
103 vcpu->run->s390_reset_flags);
104 trace_kvm_s390_request_resets(vcpu->run->s390_reset_flags);
108 static int __diag_virtio_hypercall(struct kvm_vcpu *vcpu)
112 /* No virtio-ccw notification? Get out quickly. */
113 if (!vcpu->kvm->arch.css_support ||
114 (vcpu->run->s.regs.gprs[1] != KVM_S390_VIRTIO_CCW_NOTIFY))
118 * The layout is as follows:
119 * - gpr 2 contains the subchannel id (passed as addr)
120 * - gpr 3 contains the virtqueue index (passed as datamatch)
121 * - gpr 4 contains the index on the bus (optionally)
123 ret = kvm_io_bus_write_cookie(vcpu->kvm, KVM_VIRTIO_CCW_NOTIFY_BUS,
124 vcpu->run->s.regs.gprs[2],
125 8, &vcpu->run->s.regs.gprs[3],
126 vcpu->run->s.regs.gprs[4]);
129 * Return cookie in gpr 2, but don't overwrite the register if the
130 * diagnose will be handled by userspace.
132 if (ret != -EOPNOTSUPP)
133 vcpu->run->s.regs.gprs[2] = ret;
134 /* kvm_io_bus_write_cookie returns -EOPNOTSUPP if it found no match. */
135 return ret < 0 ? ret : 0;
138 int kvm_s390_handle_diag(struct kvm_vcpu *vcpu)
140 int code = (vcpu->arch.sie_block->ipb & 0xfff0000) >> 16;
142 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
143 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
145 trace_kvm_s390_handle_diag(vcpu, code);
148 return diag_release_pages(vcpu);
150 return __diag_time_slice_end(vcpu);
152 return __diag_time_slice_end_directed(vcpu);
154 return __diag_ipl_functions(vcpu);
156 return __diag_virtio_hypercall(vcpu);