forked from Minki/linux
953ed88d10
LCTL and LCTLG are also privileged instructions, thus there is no need for treating them separately from the other instructions in priv.c. So this patch moves these two instructions to priv.c, adds a check for supervisor state and simplifies the "handle_eb" instruction decoding by merging the two eb_handlers jump tables from intercept.c and priv.c into one table only. Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com> Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
165 lines
4.2 KiB
C
165 lines
4.2 KiB
C
/*
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* in-kernel handling for sie intercepts
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*
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* Copyright IBM Corp. 2008, 2009
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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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#include "gaccess.h"
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#include "trace.h"
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#include "trace-s390.h"
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static const intercept_handler_t instruction_handlers[256] = {
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[0x01] = kvm_s390_handle_01,
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[0x82] = kvm_s390_handle_lpsw,
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[0x83] = kvm_s390_handle_diag,
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[0xae] = kvm_s390_handle_sigp,
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[0xb2] = kvm_s390_handle_b2,
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[0xb7] = kvm_s390_handle_lctl,
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[0xb9] = kvm_s390_handle_b9,
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[0xe5] = kvm_s390_handle_e5,
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[0xeb] = kvm_s390_handle_eb,
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};
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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 0x0:
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vcpu->stat.exit_null++;
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break;
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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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int rc = 0;
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vcpu->stat.exit_stop_request++;
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spin_lock_bh(&vcpu->arch.local_int.lock);
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trace_kvm_s390_stop_request(vcpu->arch.local_int.action_bits);
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if (vcpu->arch.local_int.action_bits & ACTION_RELOADVCPU_ON_STOP) {
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vcpu->arch.local_int.action_bits &= ~ACTION_RELOADVCPU_ON_STOP;
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rc = SIE_INTERCEPT_RERUNVCPU;
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vcpu->run->exit_reason = KVM_EXIT_INTR;
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}
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if (vcpu->arch.local_int.action_bits & ACTION_STOP_ON_STOP) {
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atomic_set_mask(CPUSTAT_STOPPED,
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&vcpu->arch.sie_block->cpuflags);
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vcpu->arch.local_int.action_bits &= ~ACTION_STOP_ON_STOP;
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VCPU_EVENT(vcpu, 3, "%s", "cpu stopped");
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rc = -EOPNOTSUPP;
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}
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if (vcpu->arch.local_int.action_bits & ACTION_STORE_ON_STOP) {
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vcpu->arch.local_int.action_bits &= ~ACTION_STORE_ON_STOP;
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/* store status must be called unlocked. Since local_int.lock
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* only protects local_int.* and not guest memory we can give
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* up the lock here */
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spin_unlock_bh(&vcpu->arch.local_int.lock);
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rc = kvm_s390_vcpu_store_status(vcpu,
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KVM_S390_STORE_STATUS_NOADDR);
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if (rc >= 0)
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rc = -EOPNOTSUPP;
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} else
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spin_unlock_bh(&vcpu->arch.local_int.lock);
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return rc;
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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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trace_kvm_s390_intercept_validity(vcpu, viwhy);
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WARN_ONCE(true, "kvm: unhandled validity intercept 0x%x\n", viwhy);
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return -EOPNOTSUPP;
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}
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static int handle_instruction(struct kvm_vcpu *vcpu)
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{
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intercept_handler_t handler;
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vcpu->stat.exit_instruction++;
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trace_kvm_s390_intercept_instruction(vcpu,
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vcpu->arch.sie_block->ipa,
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vcpu->arch.sie_block->ipb);
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handler = instruction_handlers[vcpu->arch.sie_block->ipa >> 8];
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if (handler)
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return handler(vcpu);
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return -EOPNOTSUPP;
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}
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static int handle_prog(struct kvm_vcpu *vcpu)
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{
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vcpu->stat.exit_program_interruption++;
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trace_kvm_s390_intercept_prog(vcpu, vcpu->arch.sie_block->iprcc);
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return kvm_s390_inject_program_int(vcpu, vcpu->arch.sie_block->iprcc);
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}
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static int handle_instruction_and_prog(struct kvm_vcpu *vcpu)
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{
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int rc, rc2;
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vcpu->stat.exit_instr_and_program++;
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rc = handle_instruction(vcpu);
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rc2 = handle_prog(vcpu);
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if (rc == -EOPNOTSUPP)
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vcpu->arch.sie_block->icptcode = 0x04;
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if (rc)
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return rc;
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return rc2;
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}
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static const intercept_handler_t intercept_funcs[] = {
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[0x00 >> 2] = handle_noop,
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[0x04 >> 2] = handle_instruction,
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[0x08 >> 2] = handle_prog,
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[0x0C >> 2] = handle_instruction_and_prog,
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[0x10 >> 2] = handle_noop,
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[0x14 >> 2] = handle_noop,
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[0x18 >> 2] = handle_noop,
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[0x1C >> 2] = kvm_s390_handle_wait,
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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 >> 2) >= ARRAY_SIZE(intercept_funcs))
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return -EOPNOTSUPP;
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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 -EOPNOTSUPP;
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}
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