81 lines
1.8 KiB
C
81 lines
1.8 KiB
C
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/*
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* intercept.c - in-kernel handling for sie intercepts
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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 <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_host.h>
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#include <linux/errno.h>
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#include <linux/pagemap.h>
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#include <asm/kvm_host.h>
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#include "kvm-s390.h"
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static int handle_noop(struct kvm_vcpu *vcpu)
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{
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switch (vcpu->arch.sie_block->icptcode) {
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case 0x10:
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vcpu->stat.exit_external_request++;
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break;
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case 0x14:
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vcpu->stat.exit_external_interrupt++;
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break;
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default:
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break; /* nothing */
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}
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return 0;
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}
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static int handle_stop(struct kvm_vcpu *vcpu)
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{
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vcpu->stat.exit_stop_request++;
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VCPU_EVENT(vcpu, 3, "%s", "cpu stopped");
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atomic_clear_mask(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
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return -ENOTSUPP;
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}
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static int handle_validity(struct kvm_vcpu *vcpu)
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{
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int viwhy = vcpu->arch.sie_block->ipb >> 16;
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vcpu->stat.exit_validity++;
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if (viwhy == 0x37) {
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fault_in_pages_writeable((char __user *)
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vcpu->kvm->arch.guest_origin +
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vcpu->arch.sie_block->prefix,
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PAGE_SIZE);
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return 0;
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}
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VCPU_EVENT(vcpu, 2, "unhandled validity intercept code %d",
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viwhy);
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return -ENOTSUPP;
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}
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static const intercept_handler_t intercept_funcs[0x48 >> 2] = {
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[0x00 >> 2] = handle_noop,
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[0x10 >> 2] = handle_noop,
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[0x14 >> 2] = handle_noop,
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[0x20 >> 2] = handle_validity,
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[0x28 >> 2] = handle_stop,
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};
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int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
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{
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intercept_handler_t func;
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u8 code = vcpu->arch.sie_block->icptcode;
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if (code & 3 || code > 0x48)
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return -ENOTSUPP;
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func = intercept_funcs[code >> 2];
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if (func)
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return func(vcpu);
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return -ENOTSUPP;
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}
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