forked from Minki/linux
1ee0bc559d
We can use kvm_get_vcpu() now and don't need the local_int array in the floating_int struct anymore. This also means we don't have to hold the float_int.lock in some places. Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
461 lines
12 KiB
C
461 lines
12 KiB
C
/*
|
|
* handling interprocessor communication
|
|
*
|
|
* Copyright IBM Corp. 2008, 2013
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License (version 2 only)
|
|
* as published by the Free Software Foundation.
|
|
*
|
|
* Author(s): Carsten Otte <cotte@de.ibm.com>
|
|
* Christian Borntraeger <borntraeger@de.ibm.com>
|
|
* Christian Ehrhardt <ehrhardt@de.ibm.com>
|
|
*/
|
|
|
|
#include <linux/kvm.h>
|
|
#include <linux/kvm_host.h>
|
|
#include <linux/slab.h>
|
|
#include <asm/sigp.h>
|
|
#include "gaccess.h"
|
|
#include "kvm-s390.h"
|
|
#include "trace.h"
|
|
|
|
static int __sigp_sense(struct kvm_vcpu *vcpu, u16 cpu_addr,
|
|
u64 *reg)
|
|
{
|
|
struct kvm_s390_local_interrupt *li;
|
|
struct kvm_vcpu *dst_vcpu = NULL;
|
|
int cpuflags;
|
|
int rc;
|
|
|
|
if (cpu_addr >= KVM_MAX_VCPUS)
|
|
return SIGP_CC_NOT_OPERATIONAL;
|
|
|
|
dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
|
|
if (!dst_vcpu)
|
|
return SIGP_CC_NOT_OPERATIONAL;
|
|
li = &dst_vcpu->arch.local_int;
|
|
|
|
cpuflags = atomic_read(li->cpuflags);
|
|
if (!(cpuflags & (CPUSTAT_ECALL_PEND | CPUSTAT_STOPPED)))
|
|
rc = SIGP_CC_ORDER_CODE_ACCEPTED;
|
|
else {
|
|
*reg &= 0xffffffff00000000UL;
|
|
if (cpuflags & CPUSTAT_ECALL_PEND)
|
|
*reg |= SIGP_STATUS_EXT_CALL_PENDING;
|
|
if (cpuflags & CPUSTAT_STOPPED)
|
|
*reg |= SIGP_STATUS_STOPPED;
|
|
rc = SIGP_CC_STATUS_STORED;
|
|
}
|
|
|
|
VCPU_EVENT(vcpu, 4, "sensed status of cpu %x rc %x", cpu_addr, rc);
|
|
return rc;
|
|
}
|
|
|
|
static int __sigp_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr)
|
|
{
|
|
struct kvm_s390_local_interrupt *li;
|
|
struct kvm_s390_interrupt_info *inti;
|
|
struct kvm_vcpu *dst_vcpu = NULL;
|
|
|
|
if (cpu_addr >= KVM_MAX_VCPUS)
|
|
return SIGP_CC_NOT_OPERATIONAL;
|
|
|
|
inti = kzalloc(sizeof(*inti), GFP_KERNEL);
|
|
if (!inti)
|
|
return -ENOMEM;
|
|
|
|
inti->type = KVM_S390_INT_EMERGENCY;
|
|
inti->emerg.code = vcpu->vcpu_id;
|
|
|
|
dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
|
|
if (!dst_vcpu)
|
|
return SIGP_CC_NOT_OPERATIONAL;
|
|
li = &dst_vcpu->arch.local_int;
|
|
spin_lock_bh(&li->lock);
|
|
list_add_tail(&inti->list, &li->list);
|
|
atomic_set(&li->active, 1);
|
|
atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
|
|
if (waitqueue_active(li->wq))
|
|
wake_up_interruptible(li->wq);
|
|
spin_unlock_bh(&li->lock);
|
|
VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x", cpu_addr);
|
|
|
|
return SIGP_CC_ORDER_CODE_ACCEPTED;
|
|
}
|
|
|
|
static int __sigp_conditional_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr,
|
|
u16 asn, u64 *reg)
|
|
{
|
|
struct kvm_vcpu *dst_vcpu = NULL;
|
|
const u64 psw_int_mask = PSW_MASK_IO | PSW_MASK_EXT;
|
|
u16 p_asn, s_asn;
|
|
psw_t *psw;
|
|
u32 flags;
|
|
|
|
if (cpu_addr < KVM_MAX_VCPUS)
|
|
dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
|
|
if (!dst_vcpu)
|
|
return SIGP_CC_NOT_OPERATIONAL;
|
|
flags = atomic_read(&dst_vcpu->arch.sie_block->cpuflags);
|
|
psw = &dst_vcpu->arch.sie_block->gpsw;
|
|
p_asn = dst_vcpu->arch.sie_block->gcr[4] & 0xffff; /* Primary ASN */
|
|
s_asn = dst_vcpu->arch.sie_block->gcr[3] & 0xffff; /* Secondary ASN */
|
|
|
|
/* Deliver the emergency signal? */
|
|
if (!(flags & CPUSTAT_STOPPED)
|
|
|| (psw->mask & psw_int_mask) != psw_int_mask
|
|
|| ((flags & CPUSTAT_WAIT) && psw->addr != 0)
|
|
|| (!(flags & CPUSTAT_WAIT) && (asn == p_asn || asn == s_asn))) {
|
|
return __sigp_emergency(vcpu, cpu_addr);
|
|
} else {
|
|
*reg &= 0xffffffff00000000UL;
|
|
*reg |= SIGP_STATUS_INCORRECT_STATE;
|
|
return SIGP_CC_STATUS_STORED;
|
|
}
|
|
}
|
|
|
|
static int __sigp_external_call(struct kvm_vcpu *vcpu, u16 cpu_addr)
|
|
{
|
|
struct kvm_s390_local_interrupt *li;
|
|
struct kvm_s390_interrupt_info *inti;
|
|
struct kvm_vcpu *dst_vcpu = NULL;
|
|
|
|
if (cpu_addr >= KVM_MAX_VCPUS)
|
|
return SIGP_CC_NOT_OPERATIONAL;
|
|
|
|
inti = kzalloc(sizeof(*inti), GFP_KERNEL);
|
|
if (!inti)
|
|
return -ENOMEM;
|
|
|
|
inti->type = KVM_S390_INT_EXTERNAL_CALL;
|
|
inti->extcall.code = vcpu->vcpu_id;
|
|
|
|
dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
|
|
if (!dst_vcpu)
|
|
return SIGP_CC_NOT_OPERATIONAL;
|
|
li = &dst_vcpu->arch.local_int;
|
|
spin_lock_bh(&li->lock);
|
|
list_add_tail(&inti->list, &li->list);
|
|
atomic_set(&li->active, 1);
|
|
atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
|
|
if (waitqueue_active(li->wq))
|
|
wake_up_interruptible(li->wq);
|
|
spin_unlock_bh(&li->lock);
|
|
VCPU_EVENT(vcpu, 4, "sent sigp ext call to cpu %x", cpu_addr);
|
|
|
|
return SIGP_CC_ORDER_CODE_ACCEPTED;
|
|
}
|
|
|
|
static int __inject_sigp_stop(struct kvm_s390_local_interrupt *li, int action)
|
|
{
|
|
struct kvm_s390_interrupt_info *inti;
|
|
int rc = SIGP_CC_ORDER_CODE_ACCEPTED;
|
|
|
|
inti = kzalloc(sizeof(*inti), GFP_ATOMIC);
|
|
if (!inti)
|
|
return -ENOMEM;
|
|
inti->type = KVM_S390_SIGP_STOP;
|
|
|
|
spin_lock_bh(&li->lock);
|
|
if ((atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) {
|
|
kfree(inti);
|
|
if ((action & ACTION_STORE_ON_STOP) != 0)
|
|
rc = -ESHUTDOWN;
|
|
goto out;
|
|
}
|
|
list_add_tail(&inti->list, &li->list);
|
|
atomic_set(&li->active, 1);
|
|
atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
|
|
li->action_bits |= action;
|
|
if (waitqueue_active(li->wq))
|
|
wake_up_interruptible(li->wq);
|
|
out:
|
|
spin_unlock_bh(&li->lock);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int __sigp_stop(struct kvm_vcpu *vcpu, u16 cpu_addr, int action)
|
|
{
|
|
struct kvm_s390_local_interrupt *li;
|
|
struct kvm_vcpu *dst_vcpu = NULL;
|
|
int rc;
|
|
|
|
if (cpu_addr >= KVM_MAX_VCPUS)
|
|
return SIGP_CC_NOT_OPERATIONAL;
|
|
|
|
dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
|
|
if (!dst_vcpu)
|
|
return SIGP_CC_NOT_OPERATIONAL;
|
|
li = &dst_vcpu->arch.local_int;
|
|
|
|
rc = __inject_sigp_stop(li, action);
|
|
|
|
VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", cpu_addr);
|
|
|
|
if ((action & ACTION_STORE_ON_STOP) != 0 && rc == -ESHUTDOWN) {
|
|
/* If the CPU has already been stopped, we still have
|
|
* to save the status when doing stop-and-store. This
|
|
* has to be done after unlocking all spinlocks. */
|
|
rc = kvm_s390_store_status_unloaded(dst_vcpu,
|
|
KVM_S390_STORE_STATUS_NOADDR);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
|
|
{
|
|
int rc;
|
|
unsigned int i;
|
|
struct kvm_vcpu *v;
|
|
|
|
switch (parameter & 0xff) {
|
|
case 0:
|
|
rc = SIGP_CC_NOT_OPERATIONAL;
|
|
break;
|
|
case 1:
|
|
case 2:
|
|
kvm_for_each_vcpu(i, v, vcpu->kvm) {
|
|
v->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
|
|
kvm_clear_async_pf_completion_queue(v);
|
|
}
|
|
|
|
rc = SIGP_CC_ORDER_CODE_ACCEPTED;
|
|
break;
|
|
default:
|
|
rc = -EOPNOTSUPP;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
|
|
u64 *reg)
|
|
{
|
|
struct kvm_s390_local_interrupt *li;
|
|
struct kvm_vcpu *dst_vcpu = NULL;
|
|
struct kvm_s390_interrupt_info *inti;
|
|
int rc;
|
|
u8 tmp;
|
|
|
|
if (cpu_addr < KVM_MAX_VCPUS)
|
|
dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
|
|
if (!dst_vcpu)
|
|
return SIGP_CC_NOT_OPERATIONAL;
|
|
li = &dst_vcpu->arch.local_int;
|
|
|
|
/* make sure that the new value is valid memory */
|
|
address = address & 0x7fffe000u;
|
|
if (copy_from_guest_absolute(vcpu, &tmp, address, 1) ||
|
|
copy_from_guest_absolute(vcpu, &tmp, address + PAGE_SIZE, 1)) {
|
|
*reg &= 0xffffffff00000000UL;
|
|
*reg |= SIGP_STATUS_INVALID_PARAMETER;
|
|
return SIGP_CC_STATUS_STORED;
|
|
}
|
|
|
|
inti = kzalloc(sizeof(*inti), GFP_KERNEL);
|
|
if (!inti)
|
|
return SIGP_CC_BUSY;
|
|
|
|
spin_lock_bh(&li->lock);
|
|
/* cpu must be in stopped state */
|
|
if (!(atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) {
|
|
*reg &= 0xffffffff00000000UL;
|
|
*reg |= SIGP_STATUS_INCORRECT_STATE;
|
|
rc = SIGP_CC_STATUS_STORED;
|
|
kfree(inti);
|
|
goto out_li;
|
|
}
|
|
|
|
inti->type = KVM_S390_SIGP_SET_PREFIX;
|
|
inti->prefix.address = address;
|
|
|
|
list_add_tail(&inti->list, &li->list);
|
|
atomic_set(&li->active, 1);
|
|
if (waitqueue_active(li->wq))
|
|
wake_up_interruptible(li->wq);
|
|
rc = SIGP_CC_ORDER_CODE_ACCEPTED;
|
|
|
|
VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", cpu_addr, address);
|
|
out_li:
|
|
spin_unlock_bh(&li->lock);
|
|
return rc;
|
|
}
|
|
|
|
static int __sigp_store_status_at_addr(struct kvm_vcpu *vcpu, u16 cpu_id,
|
|
u32 addr, u64 *reg)
|
|
{
|
|
struct kvm_vcpu *dst_vcpu = NULL;
|
|
int flags;
|
|
int rc;
|
|
|
|
if (cpu_id < KVM_MAX_VCPUS)
|
|
dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_id);
|
|
if (!dst_vcpu)
|
|
return SIGP_CC_NOT_OPERATIONAL;
|
|
|
|
spin_lock_bh(&dst_vcpu->arch.local_int.lock);
|
|
flags = atomic_read(dst_vcpu->arch.local_int.cpuflags);
|
|
spin_unlock_bh(&dst_vcpu->arch.local_int.lock);
|
|
if (!(flags & CPUSTAT_STOPPED)) {
|
|
*reg &= 0xffffffff00000000UL;
|
|
*reg |= SIGP_STATUS_INCORRECT_STATE;
|
|
return SIGP_CC_STATUS_STORED;
|
|
}
|
|
|
|
addr &= 0x7ffffe00;
|
|
rc = kvm_s390_store_status_unloaded(dst_vcpu, addr);
|
|
if (rc == -EFAULT) {
|
|
*reg &= 0xffffffff00000000UL;
|
|
*reg |= SIGP_STATUS_INVALID_PARAMETER;
|
|
rc = SIGP_CC_STATUS_STORED;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
static int __sigp_sense_running(struct kvm_vcpu *vcpu, u16 cpu_addr,
|
|
u64 *reg)
|
|
{
|
|
struct kvm_s390_local_interrupt *li;
|
|
struct kvm_vcpu *dst_vcpu = NULL;
|
|
int rc;
|
|
|
|
if (cpu_addr >= KVM_MAX_VCPUS)
|
|
return SIGP_CC_NOT_OPERATIONAL;
|
|
|
|
dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
|
|
if (!dst_vcpu)
|
|
return SIGP_CC_NOT_OPERATIONAL;
|
|
li = &dst_vcpu->arch.local_int;
|
|
if (atomic_read(li->cpuflags) & CPUSTAT_RUNNING) {
|
|
/* running */
|
|
rc = SIGP_CC_ORDER_CODE_ACCEPTED;
|
|
} else {
|
|
/* not running */
|
|
*reg &= 0xffffffff00000000UL;
|
|
*reg |= SIGP_STATUS_NOT_RUNNING;
|
|
rc = SIGP_CC_STATUS_STORED;
|
|
}
|
|
|
|
VCPU_EVENT(vcpu, 4, "sensed running status of cpu %x rc %x", cpu_addr,
|
|
rc);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/* Test whether the destination CPU is available and not busy */
|
|
static int sigp_check_callable(struct kvm_vcpu *vcpu, u16 cpu_addr)
|
|
{
|
|
struct kvm_s390_local_interrupt *li;
|
|
int rc = SIGP_CC_ORDER_CODE_ACCEPTED;
|
|
struct kvm_vcpu *dst_vcpu = NULL;
|
|
|
|
if (cpu_addr >= KVM_MAX_VCPUS)
|
|
return SIGP_CC_NOT_OPERATIONAL;
|
|
|
|
dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
|
|
if (!dst_vcpu)
|
|
return SIGP_CC_NOT_OPERATIONAL;
|
|
li = &dst_vcpu->arch.local_int;
|
|
spin_lock_bh(&li->lock);
|
|
if (li->action_bits & ACTION_STOP_ON_STOP)
|
|
rc = SIGP_CC_BUSY;
|
|
spin_unlock_bh(&li->lock);
|
|
|
|
return rc;
|
|
}
|
|
|
|
int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
|
|
{
|
|
int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
|
|
int r3 = vcpu->arch.sie_block->ipa & 0x000f;
|
|
u32 parameter;
|
|
u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
|
|
u8 order_code;
|
|
int rc;
|
|
|
|
/* sigp in userspace can exit */
|
|
if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
|
|
return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
|
|
|
|
order_code = kvm_s390_get_base_disp_rs(vcpu);
|
|
|
|
if (r1 % 2)
|
|
parameter = vcpu->run->s.regs.gprs[r1];
|
|
else
|
|
parameter = vcpu->run->s.regs.gprs[r1 + 1];
|
|
|
|
trace_kvm_s390_handle_sigp(vcpu, order_code, cpu_addr, parameter);
|
|
switch (order_code) {
|
|
case SIGP_SENSE:
|
|
vcpu->stat.instruction_sigp_sense++;
|
|
rc = __sigp_sense(vcpu, cpu_addr,
|
|
&vcpu->run->s.regs.gprs[r1]);
|
|
break;
|
|
case SIGP_EXTERNAL_CALL:
|
|
vcpu->stat.instruction_sigp_external_call++;
|
|
rc = __sigp_external_call(vcpu, cpu_addr);
|
|
break;
|
|
case SIGP_EMERGENCY_SIGNAL:
|
|
vcpu->stat.instruction_sigp_emergency++;
|
|
rc = __sigp_emergency(vcpu, cpu_addr);
|
|
break;
|
|
case SIGP_STOP:
|
|
vcpu->stat.instruction_sigp_stop++;
|
|
rc = __sigp_stop(vcpu, cpu_addr, ACTION_STOP_ON_STOP);
|
|
break;
|
|
case SIGP_STOP_AND_STORE_STATUS:
|
|
vcpu->stat.instruction_sigp_stop++;
|
|
rc = __sigp_stop(vcpu, cpu_addr, ACTION_STORE_ON_STOP |
|
|
ACTION_STOP_ON_STOP);
|
|
break;
|
|
case SIGP_STORE_STATUS_AT_ADDRESS:
|
|
rc = __sigp_store_status_at_addr(vcpu, cpu_addr, parameter,
|
|
&vcpu->run->s.regs.gprs[r1]);
|
|
break;
|
|
case SIGP_SET_ARCHITECTURE:
|
|
vcpu->stat.instruction_sigp_arch++;
|
|
rc = __sigp_set_arch(vcpu, parameter);
|
|
break;
|
|
case SIGP_SET_PREFIX:
|
|
vcpu->stat.instruction_sigp_prefix++;
|
|
rc = __sigp_set_prefix(vcpu, cpu_addr, parameter,
|
|
&vcpu->run->s.regs.gprs[r1]);
|
|
break;
|
|
case SIGP_COND_EMERGENCY_SIGNAL:
|
|
rc = __sigp_conditional_emergency(vcpu, cpu_addr, parameter,
|
|
&vcpu->run->s.regs.gprs[r1]);
|
|
break;
|
|
case SIGP_SENSE_RUNNING:
|
|
vcpu->stat.instruction_sigp_sense_running++;
|
|
rc = __sigp_sense_running(vcpu, cpu_addr,
|
|
&vcpu->run->s.regs.gprs[r1]);
|
|
break;
|
|
case SIGP_START:
|
|
rc = sigp_check_callable(vcpu, cpu_addr);
|
|
if (rc == SIGP_CC_ORDER_CODE_ACCEPTED)
|
|
rc = -EOPNOTSUPP; /* Handle START in user space */
|
|
break;
|
|
case SIGP_RESTART:
|
|
vcpu->stat.instruction_sigp_restart++;
|
|
rc = sigp_check_callable(vcpu, cpu_addr);
|
|
if (rc == SIGP_CC_ORDER_CODE_ACCEPTED) {
|
|
VCPU_EVENT(vcpu, 4,
|
|
"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;
|
|
}
|