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/pgalloc.h>
17 #include <asm/virtio-ccw.h>
20 #include "trace-s390.h"
22 static int diag_release_pages(struct kvm_vcpu *vcpu)
24 unsigned long start, end;
25 unsigned long prefix = vcpu->arch.sie_block->prefix;
27 start = vcpu->run->s.regs.gprs[(vcpu->arch.sie_block->ipa & 0xf0) >> 4];
28 end = vcpu->run->s.regs.gprs[vcpu->arch.sie_block->ipa & 0xf] + 4096;
30 if (start & ~PAGE_MASK || end & ~PAGE_MASK || start > end
31 || start < 2 * PAGE_SIZE)
32 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
34 VCPU_EVENT(vcpu, 5, "diag release pages %lX %lX", start, end);
35 vcpu->stat.diagnose_10++;
37 /* we checked for start > end above */
38 if (end < prefix || start >= prefix + 2 * PAGE_SIZE) {
39 gmap_discard(start, end, vcpu->arch.gmap);
42 gmap_discard(start, prefix, vcpu->arch.gmap);
44 gmap_discard(prefix + 2 * PAGE_SIZE,
45 end, vcpu->arch.gmap);
50 static int __diag_time_slice_end(struct kvm_vcpu *vcpu)
52 VCPU_EVENT(vcpu, 5, "%s", "diag time slice end");
53 vcpu->stat.diagnose_44++;
54 kvm_vcpu_on_spin(vcpu);
58 static int __diag_time_slice_end_directed(struct kvm_vcpu *vcpu)
60 struct kvm *kvm = vcpu->kvm;
61 struct kvm_vcpu *tcpu;
65 tid = vcpu->run->s.regs.gprs[(vcpu->arch.sie_block->ipa & 0xf0) >> 4];
66 vcpu->stat.diagnose_9c++;
67 VCPU_EVENT(vcpu, 5, "diag time slice end directed to %d", tid);
69 if (tid == vcpu->vcpu_id)
72 kvm_for_each_vcpu(i, tcpu, kvm)
73 if (tcpu->vcpu_id == tid) {
74 kvm_vcpu_yield_to(tcpu);
81 static int __diag_ipl_functions(struct kvm_vcpu *vcpu)
83 unsigned int reg = vcpu->arch.sie_block->ipa & 0xf;
84 unsigned long subcode = vcpu->run->s.regs.gprs[reg] & 0xffff;
86 VCPU_EVENT(vcpu, 5, "diag ipl functions, subcode %lx", subcode);
89 vcpu->run->s390_reset_flags = KVM_S390_RESET_CLEAR;
90 page_table_reset_pgste(current->mm, 0, TASK_SIZE);
93 vcpu->run->s390_reset_flags = 0;
94 page_table_reset_pgste(current->mm, 0, TASK_SIZE);
100 atomic_set_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
101 vcpu->run->s390_reset_flags |= KVM_S390_RESET_SUBSYSTEM;
102 vcpu->run->s390_reset_flags |= KVM_S390_RESET_IPL;
103 vcpu->run->s390_reset_flags |= KVM_S390_RESET_CPU_INIT;
104 vcpu->run->exit_reason = KVM_EXIT_S390_RESET;
105 VCPU_EVENT(vcpu, 3, "requesting userspace resets %llx",
106 vcpu->run->s390_reset_flags);
107 trace_kvm_s390_request_resets(vcpu->run->s390_reset_flags);
111 static int __diag_virtio_hypercall(struct kvm_vcpu *vcpu)
115 /* No virtio-ccw notification? Get out quickly. */
116 if (!vcpu->kvm->arch.css_support ||
117 (vcpu->run->s.regs.gprs[1] != KVM_S390_VIRTIO_CCW_NOTIFY))
121 * The layout is as follows:
122 * - gpr 2 contains the subchannel id (passed as addr)
123 * - gpr 3 contains the virtqueue index (passed as datamatch)
124 * - gpr 4 contains the index on the bus (optionally)
126 ret = kvm_io_bus_write_cookie(vcpu->kvm, KVM_VIRTIO_CCW_NOTIFY_BUS,
127 vcpu->run->s.regs.gprs[2] & 0xffffffff,
128 8, &vcpu->run->s.regs.gprs[3],
129 vcpu->run->s.regs.gprs[4]);
132 * Return cookie in gpr 2, but don't overwrite the register if the
133 * diagnose will be handled by userspace.
135 if (ret != -EOPNOTSUPP)
136 vcpu->run->s.regs.gprs[2] = ret;
137 /* kvm_io_bus_write_cookie returns -EOPNOTSUPP if it found no match. */
138 return ret < 0 ? ret : 0;
141 int kvm_s390_handle_diag(struct kvm_vcpu *vcpu)
143 int code = kvm_s390_get_base_disp_rs(vcpu) & 0xffff;
145 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
146 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
148 trace_kvm_s390_handle_diag(vcpu, code);
151 return diag_release_pages(vcpu);
153 return __diag_time_slice_end(vcpu);
155 return __diag_time_slice_end_directed(vcpu);
157 return __diag_ipl_functions(vcpu);
159 return __diag_virtio_hypercall(vcpu);