98 lines
2.6 KiB
C
98 lines
2.6 KiB
C
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/*
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* diag.c - handling diagnose instructions
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*
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* Copyright IBM Corp. 2008,2011
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License (version 2 only)
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* as published by the Free Software Foundation.
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*
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* Author(s): Carsten Otte <cotte@de.ibm.com>
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* Christian Borntraeger <borntraeger@de.ibm.com>
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*/
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#include <linux/kvm.h>
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#include <linux/kvm_host.h>
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#include "kvm-s390.h"
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static int diag_release_pages(struct kvm_vcpu *vcpu)
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{
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unsigned long start, end;
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unsigned long prefix = vcpu->arch.sie_block->prefix;
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start = vcpu->run->s.regs.gprs[(vcpu->arch.sie_block->ipa & 0xf0) >> 4];
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end = vcpu->run->s.regs.gprs[vcpu->arch.sie_block->ipa & 0xf] + 4096;
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if (start & ~PAGE_MASK || end & ~PAGE_MASK || start > end
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|| start < 2 * PAGE_SIZE)
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return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
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VCPU_EVENT(vcpu, 5, "diag release pages %lX %lX", start, end);
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vcpu->stat.diagnose_10++;
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/* we checked for start > end above */
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if (end < prefix || start >= prefix + 2 * PAGE_SIZE) {
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gmap_discard(start, end, vcpu->arch.gmap);
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} else {
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if (start < prefix)
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gmap_discard(start, prefix, vcpu->arch.gmap);
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if (end >= prefix)
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gmap_discard(prefix + 2 * PAGE_SIZE,
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end, vcpu->arch.gmap);
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}
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return 0;
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}
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static int __diag_time_slice_end(struct kvm_vcpu *vcpu)
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{
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VCPU_EVENT(vcpu, 5, "%s", "diag time slice end");
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vcpu->stat.diagnose_44++;
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vcpu_put(vcpu);
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yield();
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vcpu_load(vcpu);
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return 0;
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}
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static int __diag_ipl_functions(struct kvm_vcpu *vcpu)
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{
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unsigned int reg = vcpu->arch.sie_block->ipa & 0xf;
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unsigned long subcode = vcpu->run->s.regs.gprs[reg] & 0xffff;
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VCPU_EVENT(vcpu, 5, "diag ipl functions, subcode %lx", subcode);
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switch (subcode) {
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case 3:
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vcpu->run->s390_reset_flags = KVM_S390_RESET_CLEAR;
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break;
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case 4:
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vcpu->run->s390_reset_flags = 0;
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break;
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default:
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return -EOPNOTSUPP;
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}
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atomic_set_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
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vcpu->run->s390_reset_flags |= KVM_S390_RESET_SUBSYSTEM;
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vcpu->run->s390_reset_flags |= KVM_S390_RESET_IPL;
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vcpu->run->s390_reset_flags |= KVM_S390_RESET_CPU_INIT;
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vcpu->run->exit_reason = KVM_EXIT_S390_RESET;
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VCPU_EVENT(vcpu, 3, "requesting userspace resets %llx",
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vcpu->run->s390_reset_flags);
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return -EREMOTE;
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}
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int kvm_s390_handle_diag(struct kvm_vcpu *vcpu)
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{
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int code = (vcpu->arch.sie_block->ipb & 0xfff0000) >> 16;
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switch (code) {
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case 0x10:
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return diag_release_pages(vcpu);
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case 0x44:
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return __diag_time_slice_end(vcpu);
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case 0x308:
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return __diag_ipl_functions(vcpu);
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default:
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return -EOPNOTSUPP;
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}
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}
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