mirror of https://gitee.com/openkylin/linux.git
484 lines
12 KiB
C
484 lines
12 KiB
C
/*
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* handling interprocessor communication
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*
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* Copyright IBM Corp. 2008, 2013
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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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* Christian Ehrhardt <ehrhardt@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 <linux/slab.h>
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#include <asm/sigp.h>
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#include "gaccess.h"
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#include "kvm-s390.h"
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#include "trace.h"
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static int __sigp_sense(struct kvm_vcpu *vcpu, u16 cpu_addr,
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u64 *reg)
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{
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struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
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int rc;
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if (cpu_addr >= KVM_MAX_VCPUS)
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return SIGP_CC_NOT_OPERATIONAL;
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spin_lock(&fi->lock);
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if (fi->local_int[cpu_addr] == NULL)
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rc = SIGP_CC_NOT_OPERATIONAL;
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else if (!(atomic_read(fi->local_int[cpu_addr]->cpuflags)
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& (CPUSTAT_ECALL_PEND | CPUSTAT_STOPPED)))
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rc = SIGP_CC_ORDER_CODE_ACCEPTED;
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else {
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*reg &= 0xffffffff00000000UL;
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if (atomic_read(fi->local_int[cpu_addr]->cpuflags)
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& CPUSTAT_ECALL_PEND)
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*reg |= SIGP_STATUS_EXT_CALL_PENDING;
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if (atomic_read(fi->local_int[cpu_addr]->cpuflags)
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& CPUSTAT_STOPPED)
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*reg |= SIGP_STATUS_STOPPED;
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rc = SIGP_CC_STATUS_STORED;
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}
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spin_unlock(&fi->lock);
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VCPU_EVENT(vcpu, 4, "sensed status of cpu %x rc %x", cpu_addr, rc);
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return rc;
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}
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static int __sigp_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr)
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{
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struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
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struct kvm_s390_local_interrupt *li;
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struct kvm_s390_interrupt_info *inti;
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int rc;
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if (cpu_addr >= KVM_MAX_VCPUS)
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return SIGP_CC_NOT_OPERATIONAL;
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inti = kzalloc(sizeof(*inti), GFP_KERNEL);
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if (!inti)
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return -ENOMEM;
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inti->type = KVM_S390_INT_EMERGENCY;
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inti->emerg.code = vcpu->vcpu_id;
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spin_lock(&fi->lock);
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li = fi->local_int[cpu_addr];
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if (li == NULL) {
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rc = SIGP_CC_NOT_OPERATIONAL;
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kfree(inti);
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goto unlock;
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}
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spin_lock_bh(&li->lock);
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list_add_tail(&inti->list, &li->list);
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atomic_set(&li->active, 1);
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atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
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if (waitqueue_active(li->wq))
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wake_up_interruptible(li->wq);
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spin_unlock_bh(&li->lock);
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rc = SIGP_CC_ORDER_CODE_ACCEPTED;
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VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x", cpu_addr);
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unlock:
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spin_unlock(&fi->lock);
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return rc;
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}
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static int __sigp_conditional_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr,
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u16 asn, u64 *reg)
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{
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struct kvm_vcpu *dst_vcpu = NULL;
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const u64 psw_int_mask = PSW_MASK_IO | PSW_MASK_EXT;
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u16 p_asn, s_asn;
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psw_t *psw;
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u32 flags;
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if (cpu_addr < KVM_MAX_VCPUS)
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dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
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if (!dst_vcpu)
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return SIGP_CC_NOT_OPERATIONAL;
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flags = atomic_read(&dst_vcpu->arch.sie_block->cpuflags);
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psw = &dst_vcpu->arch.sie_block->gpsw;
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p_asn = dst_vcpu->arch.sie_block->gcr[4] & 0xffff; /* Primary ASN */
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s_asn = dst_vcpu->arch.sie_block->gcr[3] & 0xffff; /* Secondary ASN */
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/* Deliver the emergency signal? */
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if (!(flags & CPUSTAT_STOPPED)
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|| (psw->mask & psw_int_mask) != psw_int_mask
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|| ((flags & CPUSTAT_WAIT) && psw->addr != 0)
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|| (!(flags & CPUSTAT_WAIT) && (asn == p_asn || asn == s_asn))) {
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return __sigp_emergency(vcpu, cpu_addr);
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} else {
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*reg &= 0xffffffff00000000UL;
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*reg |= SIGP_STATUS_INCORRECT_STATE;
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return SIGP_CC_STATUS_STORED;
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}
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}
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static int __sigp_external_call(struct kvm_vcpu *vcpu, u16 cpu_addr)
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{
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struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
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struct kvm_s390_local_interrupt *li;
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struct kvm_s390_interrupt_info *inti;
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int rc;
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if (cpu_addr >= KVM_MAX_VCPUS)
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return SIGP_CC_NOT_OPERATIONAL;
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inti = kzalloc(sizeof(*inti), GFP_KERNEL);
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if (!inti)
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return -ENOMEM;
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inti->type = KVM_S390_INT_EXTERNAL_CALL;
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inti->extcall.code = vcpu->vcpu_id;
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spin_lock(&fi->lock);
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li = fi->local_int[cpu_addr];
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if (li == NULL) {
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rc = SIGP_CC_NOT_OPERATIONAL;
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kfree(inti);
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goto unlock;
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}
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spin_lock_bh(&li->lock);
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list_add_tail(&inti->list, &li->list);
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atomic_set(&li->active, 1);
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atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
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if (waitqueue_active(li->wq))
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wake_up_interruptible(li->wq);
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spin_unlock_bh(&li->lock);
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rc = SIGP_CC_ORDER_CODE_ACCEPTED;
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VCPU_EVENT(vcpu, 4, "sent sigp ext call to cpu %x", cpu_addr);
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unlock:
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spin_unlock(&fi->lock);
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return rc;
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}
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static int __inject_sigp_stop(struct kvm_s390_local_interrupt *li, int action)
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{
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struct kvm_s390_interrupt_info *inti;
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int rc = SIGP_CC_ORDER_CODE_ACCEPTED;
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inti = kzalloc(sizeof(*inti), GFP_ATOMIC);
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if (!inti)
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return -ENOMEM;
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inti->type = KVM_S390_SIGP_STOP;
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spin_lock_bh(&li->lock);
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if ((atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) {
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kfree(inti);
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if ((action & ACTION_STORE_ON_STOP) != 0)
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rc = -ESHUTDOWN;
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goto out;
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}
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list_add_tail(&inti->list, &li->list);
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atomic_set(&li->active, 1);
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atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
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li->action_bits |= action;
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if (waitqueue_active(li->wq))
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wake_up_interruptible(li->wq);
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out:
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spin_unlock_bh(&li->lock);
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return rc;
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}
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static int __sigp_stop(struct kvm_vcpu *vcpu, u16 cpu_addr, int action)
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{
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struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
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struct kvm_s390_local_interrupt *li;
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int rc;
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if (cpu_addr >= KVM_MAX_VCPUS)
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return SIGP_CC_NOT_OPERATIONAL;
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spin_lock(&fi->lock);
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li = fi->local_int[cpu_addr];
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if (li == NULL) {
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rc = SIGP_CC_NOT_OPERATIONAL;
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goto unlock;
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}
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rc = __inject_sigp_stop(li, action);
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unlock:
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spin_unlock(&fi->lock);
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VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", cpu_addr);
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if ((action & ACTION_STORE_ON_STOP) != 0 && rc == -ESHUTDOWN) {
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/* If the CPU has already been stopped, we still have
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* to save the status when doing stop-and-store. This
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* has to be done after unlocking all spinlocks. */
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struct kvm_vcpu *dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
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rc = kvm_s390_store_status_unloaded(dst_vcpu,
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KVM_S390_STORE_STATUS_NOADDR);
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}
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return rc;
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}
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static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
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{
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int rc;
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switch (parameter & 0xff) {
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case 0:
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rc = SIGP_CC_NOT_OPERATIONAL;
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break;
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case 1:
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case 2:
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rc = SIGP_CC_ORDER_CODE_ACCEPTED;
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break;
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default:
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rc = -EOPNOTSUPP;
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}
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return rc;
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}
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static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
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u64 *reg)
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{
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struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
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struct kvm_s390_local_interrupt *li = NULL;
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struct kvm_s390_interrupt_info *inti;
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int rc;
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u8 tmp;
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/* make sure that the new value is valid memory */
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address = address & 0x7fffe000u;
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if (copy_from_guest_absolute(vcpu, &tmp, address, 1) ||
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copy_from_guest_absolute(vcpu, &tmp, address + PAGE_SIZE, 1)) {
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*reg &= 0xffffffff00000000UL;
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*reg |= SIGP_STATUS_INVALID_PARAMETER;
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return SIGP_CC_STATUS_STORED;
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}
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inti = kzalloc(sizeof(*inti), GFP_KERNEL);
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if (!inti)
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return SIGP_CC_BUSY;
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spin_lock(&fi->lock);
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if (cpu_addr < KVM_MAX_VCPUS)
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li = fi->local_int[cpu_addr];
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if (li == NULL) {
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*reg &= 0xffffffff00000000UL;
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*reg |= SIGP_STATUS_INCORRECT_STATE;
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rc = SIGP_CC_STATUS_STORED;
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kfree(inti);
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goto out_fi;
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}
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spin_lock_bh(&li->lock);
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/* cpu must be in stopped state */
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if (!(atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) {
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*reg &= 0xffffffff00000000UL;
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*reg |= SIGP_STATUS_INCORRECT_STATE;
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rc = SIGP_CC_STATUS_STORED;
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kfree(inti);
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goto out_li;
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}
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inti->type = KVM_S390_SIGP_SET_PREFIX;
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inti->prefix.address = address;
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list_add_tail(&inti->list, &li->list);
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atomic_set(&li->active, 1);
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if (waitqueue_active(li->wq))
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wake_up_interruptible(li->wq);
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rc = SIGP_CC_ORDER_CODE_ACCEPTED;
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VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", cpu_addr, address);
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out_li:
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spin_unlock_bh(&li->lock);
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out_fi:
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spin_unlock(&fi->lock);
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return rc;
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}
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static int __sigp_store_status_at_addr(struct kvm_vcpu *vcpu, u16 cpu_id,
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u32 addr, u64 *reg)
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{
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struct kvm_vcpu *dst_vcpu = NULL;
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int flags;
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int rc;
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if (cpu_id < KVM_MAX_VCPUS)
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dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_id);
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if (!dst_vcpu)
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return SIGP_CC_NOT_OPERATIONAL;
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spin_lock_bh(&dst_vcpu->arch.local_int.lock);
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flags = atomic_read(dst_vcpu->arch.local_int.cpuflags);
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spin_unlock_bh(&dst_vcpu->arch.local_int.lock);
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if (!(flags & CPUSTAT_STOPPED)) {
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*reg &= 0xffffffff00000000UL;
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*reg |= SIGP_STATUS_INCORRECT_STATE;
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return SIGP_CC_STATUS_STORED;
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}
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addr &= 0x7ffffe00;
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rc = kvm_s390_store_status_unloaded(dst_vcpu, addr);
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if (rc == -EFAULT) {
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*reg &= 0xffffffff00000000UL;
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*reg |= SIGP_STATUS_INVALID_PARAMETER;
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rc = SIGP_CC_STATUS_STORED;
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}
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return rc;
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}
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static int __sigp_sense_running(struct kvm_vcpu *vcpu, u16 cpu_addr,
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u64 *reg)
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{
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int rc;
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struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
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if (cpu_addr >= KVM_MAX_VCPUS)
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return SIGP_CC_NOT_OPERATIONAL;
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spin_lock(&fi->lock);
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if (fi->local_int[cpu_addr] == NULL)
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rc = SIGP_CC_NOT_OPERATIONAL;
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else {
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if (atomic_read(fi->local_int[cpu_addr]->cpuflags)
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& CPUSTAT_RUNNING) {
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/* running */
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rc = SIGP_CC_ORDER_CODE_ACCEPTED;
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} else {
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/* not running */
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*reg &= 0xffffffff00000000UL;
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*reg |= SIGP_STATUS_NOT_RUNNING;
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rc = SIGP_CC_STATUS_STORED;
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}
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}
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spin_unlock(&fi->lock);
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VCPU_EVENT(vcpu, 4, "sensed running status of cpu %x rc %x", cpu_addr,
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rc);
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return rc;
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}
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/* Test whether the destination CPU is available and not busy */
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static int sigp_check_callable(struct kvm_vcpu *vcpu, u16 cpu_addr)
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{
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struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
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struct kvm_s390_local_interrupt *li;
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int rc = SIGP_CC_ORDER_CODE_ACCEPTED;
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if (cpu_addr >= KVM_MAX_VCPUS)
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return SIGP_CC_NOT_OPERATIONAL;
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spin_lock(&fi->lock);
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li = fi->local_int[cpu_addr];
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if (li == NULL) {
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rc = SIGP_CC_NOT_OPERATIONAL;
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goto out;
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}
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spin_lock_bh(&li->lock);
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if (li->action_bits & ACTION_STOP_ON_STOP)
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rc = SIGP_CC_BUSY;
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spin_unlock_bh(&li->lock);
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out:
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spin_unlock(&fi->lock);
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return rc;
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}
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int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
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{
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int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
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int r3 = vcpu->arch.sie_block->ipa & 0x000f;
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u32 parameter;
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u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
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u8 order_code;
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int rc;
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/* sigp in userspace can exit */
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if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
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return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
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order_code = kvm_s390_get_base_disp_rs(vcpu);
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if (r1 % 2)
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parameter = vcpu->run->s.regs.gprs[r1];
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else
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parameter = vcpu->run->s.regs.gprs[r1 + 1];
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trace_kvm_s390_handle_sigp(vcpu, order_code, cpu_addr, parameter);
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switch (order_code) {
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case SIGP_SENSE:
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vcpu->stat.instruction_sigp_sense++;
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rc = __sigp_sense(vcpu, cpu_addr,
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&vcpu->run->s.regs.gprs[r1]);
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break;
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case SIGP_EXTERNAL_CALL:
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vcpu->stat.instruction_sigp_external_call++;
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rc = __sigp_external_call(vcpu, cpu_addr);
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break;
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case SIGP_EMERGENCY_SIGNAL:
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vcpu->stat.instruction_sigp_emergency++;
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rc = __sigp_emergency(vcpu, cpu_addr);
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break;
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case SIGP_STOP:
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vcpu->stat.instruction_sigp_stop++;
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rc = __sigp_stop(vcpu, cpu_addr, ACTION_STOP_ON_STOP);
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break;
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case SIGP_STOP_AND_STORE_STATUS:
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vcpu->stat.instruction_sigp_stop++;
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rc = __sigp_stop(vcpu, cpu_addr, ACTION_STORE_ON_STOP |
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ACTION_STOP_ON_STOP);
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break;
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case SIGP_STORE_STATUS_AT_ADDRESS:
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rc = __sigp_store_status_at_addr(vcpu, cpu_addr, parameter,
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&vcpu->run->s.regs.gprs[r1]);
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break;
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case SIGP_SET_ARCHITECTURE:
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vcpu->stat.instruction_sigp_arch++;
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rc = __sigp_set_arch(vcpu, parameter);
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break;
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case SIGP_SET_PREFIX:
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vcpu->stat.instruction_sigp_prefix++;
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rc = __sigp_set_prefix(vcpu, cpu_addr, parameter,
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&vcpu->run->s.regs.gprs[r1]);
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break;
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case SIGP_COND_EMERGENCY_SIGNAL:
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rc = __sigp_conditional_emergency(vcpu, cpu_addr, parameter,
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&vcpu->run->s.regs.gprs[r1]);
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break;
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case SIGP_SENSE_RUNNING:
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vcpu->stat.instruction_sigp_sense_running++;
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rc = __sigp_sense_running(vcpu, cpu_addr,
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&vcpu->run->s.regs.gprs[r1]);
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break;
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case SIGP_START:
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rc = sigp_check_callable(vcpu, cpu_addr);
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if (rc == SIGP_CC_ORDER_CODE_ACCEPTED)
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rc = -EOPNOTSUPP; /* Handle START in user space */
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break;
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case SIGP_RESTART:
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vcpu->stat.instruction_sigp_restart++;
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rc = sigp_check_callable(vcpu, cpu_addr);
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if (rc == SIGP_CC_ORDER_CODE_ACCEPTED) {
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VCPU_EVENT(vcpu, 4,
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"sigp restart %x to handle userspace",
|
|
cpu_addr);
|
|
/* user space must know about restart */
|
|
rc = -EOPNOTSUPP;
|
|
}
|
|
break;
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
kvm_s390_set_psw_cc(vcpu, rc);
|
|
return 0;
|
|
}
|