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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/s390/kvm/diag.c
10817 views
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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

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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 <[email protected]>

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 *               Christian Borntraeger <[email protected]>

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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_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->arch.guest_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_clear_mask(CPUSTAT_RUNNING, &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 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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