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linux_dsm_epyc7002/arch/s390/kvm/sigp.c
David Hildenbrand 6cddd432e3 KVM: s390: handle stop irqs without action_bits 
This patch removes the famous action_bits and moves the handling of
SIGP STOP AND STORE STATUS directly into the SIGP STOP interrupt.

The new local interrupt infrastructure is used to track pending stop
requests.

STOP irqs are the only irqs that don't get actively delivered. They
remain pending until the stop function is executed (=stop intercept).

If another STOP irq is already pending, -EBUSY will now be returned
(needed for the SIGP handling code).

Migration of pending SIGP STOP (AND STORE STATUS) orders should now
be supported out of the box.

Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2015-01-23 13:25:33 +01:00

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/*
* 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, struct kvm_vcpu *dst_vcpu,
u64 *reg)
{
struct kvm_s390_local_interrupt *li;
int cpuflags;
int rc;
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", dst_vcpu->vcpu_id,
rc);
return rc;
}
static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
struct kvm_vcpu *dst_vcpu)
{
struct kvm_s390_irq irq = {
.type = KVM_S390_INT_EMERGENCY,
.u.emerg.code = vcpu->vcpu_id,
};
int rc = 0;
rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
if (!rc)
VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x",
dst_vcpu->vcpu_id);
return rc ? rc : SIGP_CC_ORDER_CODE_ACCEPTED;
}
static int __sigp_emergency(struct kvm_vcpu *vcpu, struct kvm_vcpu *dst_vcpu)
{
return __inject_sigp_emergency(vcpu, dst_vcpu);
}
static int __sigp_conditional_emergency(struct kvm_vcpu *vcpu,
struct kvm_vcpu *dst_vcpu,
u16 asn, u64 *reg)
{
const u64 psw_int_mask = PSW_MASK_IO | PSW_MASK_EXT;
u16 p_asn, s_asn;
psw_t *psw;
u32 flags;
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 */
/* Inject 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 __inject_sigp_emergency(vcpu, dst_vcpu);
} else {
*reg &= 0xffffffff00000000UL;
*reg |= SIGP_STATUS_INCORRECT_STATE;
return SIGP_CC_STATUS_STORED;
}
}
static int __sigp_external_call(struct kvm_vcpu *vcpu,
struct kvm_vcpu *dst_vcpu)
{
struct kvm_s390_irq irq = {
.type = KVM_S390_INT_EXTERNAL_CALL,
.u.extcall.code = vcpu->vcpu_id,
};
int rc;
rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
if (!rc)
VCPU_EVENT(vcpu, 4, "sent sigp ext call to cpu %x",
dst_vcpu->vcpu_id);
return rc ? rc : SIGP_CC_ORDER_CODE_ACCEPTED;
}
static int __sigp_stop(struct kvm_vcpu *vcpu, struct kvm_vcpu *dst_vcpu)
{
struct kvm_s390_irq irq = {
.type = KVM_S390_SIGP_STOP,
};
int rc;
rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
if (rc == -EBUSY)
rc = SIGP_CC_BUSY;
else if (rc == 0)
VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x",
dst_vcpu->vcpu_id);
return rc;
}
static int __sigp_stop_and_store_status(struct kvm_vcpu *vcpu,
struct kvm_vcpu *dst_vcpu, u64 *reg)
{
struct kvm_s390_irq irq = {
.type = KVM_S390_SIGP_STOP,
.u.stop.flags = KVM_S390_STOP_FLAG_STORE_STATUS,
};
int rc;
rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
if (rc == -EBUSY)
rc = SIGP_CC_BUSY;
else if (rc == 0)
VCPU_EVENT(vcpu, 4, "sent sigp stop and store status to cpu %x",
dst_vcpu->vcpu_id);
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, struct kvm_vcpu *dst_vcpu,
u32 address, u64 *reg)
{
struct kvm_s390_local_interrupt *li;
int rc;
li = &dst_vcpu->arch.local_int;
/*
* Make sure the new value is valid memory. We only need to check the
* first page, since address is 8k aligned and memory pieces are always
* at least 1MB aligned and have at least a size of 1MB.
*/
address &= 0x7fffe000u;
if (kvm_is_error_gpa(vcpu->kvm, address)) {
*reg &= 0xffffffff00000000UL;
*reg |= SIGP_STATUS_INVALID_PARAMETER;
return SIGP_CC_STATUS_STORED;
}
spin_lock(&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;
goto out_li;
}
li->irq.prefix.address = address;
set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
kvm_s390_vcpu_wakeup(dst_vcpu);
rc = SIGP_CC_ORDER_CODE_ACCEPTED;
VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", dst_vcpu->vcpu_id,
address);
out_li:
spin_unlock(&li->lock);
return rc;
}
static int __sigp_store_status_at_addr(struct kvm_vcpu *vcpu,
struct kvm_vcpu *dst_vcpu,
u32 addr, u64 *reg)
{
int flags;
int rc;
flags = atomic_read(dst_vcpu->arch.local_int.cpuflags);
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,
struct kvm_vcpu *dst_vcpu, u64 *reg)
{
struct kvm_s390_local_interrupt *li;
int rc;
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",
dst_vcpu->vcpu_id, rc);
return rc;
}
static int __prepare_sigp_re_start(struct kvm_vcpu *vcpu,
struct kvm_vcpu *dst_vcpu, u8 order_code)
{
struct kvm_s390_local_interrupt *li = &dst_vcpu->arch.local_int;
/* handle (RE)START in user space */
int rc = -EOPNOTSUPP;
/* make sure we don't race with STOP irq injection */
spin_lock(&li->lock);
if (kvm_s390_is_stop_irq_pending(dst_vcpu))
rc = SIGP_CC_BUSY;
spin_unlock(&li->lock);
return rc;
}
static int __prepare_sigp_cpu_reset(struct kvm_vcpu *vcpu,
struct kvm_vcpu *dst_vcpu, u8 order_code)
{
/* handle (INITIAL) CPU RESET in user space */
return -EOPNOTSUPP;
}
static int __prepare_sigp_unknown(struct kvm_vcpu *vcpu,
struct kvm_vcpu *dst_vcpu)
{
/* handle unknown orders in user space */
return -EOPNOTSUPP;
}
static int handle_sigp_dst(struct kvm_vcpu *vcpu, u8 order_code,
u16 cpu_addr, u32 parameter, u64 *status_reg)
{
int rc;
struct kvm_vcpu *dst_vcpu;
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;
switch (order_code) {
case SIGP_SENSE:
vcpu->stat.instruction_sigp_sense++;
rc = __sigp_sense(vcpu, dst_vcpu, status_reg);
break;
case SIGP_EXTERNAL_CALL:
vcpu->stat.instruction_sigp_external_call++;
rc = __sigp_external_call(vcpu, dst_vcpu);
break;
case SIGP_EMERGENCY_SIGNAL:
vcpu->stat.instruction_sigp_emergency++;
rc = __sigp_emergency(vcpu, dst_vcpu);
break;
case SIGP_STOP:
vcpu->stat.instruction_sigp_stop++;
rc = __sigp_stop(vcpu, dst_vcpu);
break;
case SIGP_STOP_AND_STORE_STATUS:
vcpu->stat.instruction_sigp_stop_store_status++;
rc = __sigp_stop_and_store_status(vcpu, dst_vcpu, status_reg);
break;
case SIGP_STORE_STATUS_AT_ADDRESS:
vcpu->stat.instruction_sigp_store_status++;
rc = __sigp_store_status_at_addr(vcpu, dst_vcpu, parameter,
status_reg);
break;
case SIGP_SET_PREFIX:
vcpu->stat.instruction_sigp_prefix++;
rc = __sigp_set_prefix(vcpu, dst_vcpu, parameter, status_reg);
break;
case SIGP_COND_EMERGENCY_SIGNAL:
vcpu->stat.instruction_sigp_cond_emergency++;
rc = __sigp_conditional_emergency(vcpu, dst_vcpu, parameter,
status_reg);
break;
case SIGP_SENSE_RUNNING:
vcpu->stat.instruction_sigp_sense_running++;
rc = __sigp_sense_running(vcpu, dst_vcpu, status_reg);
break;
case SIGP_START:
vcpu->stat.instruction_sigp_start++;
rc = __prepare_sigp_re_start(vcpu, dst_vcpu, order_code);
break;
case SIGP_RESTART:
vcpu->stat.instruction_sigp_restart++;
rc = __prepare_sigp_re_start(vcpu, dst_vcpu, order_code);
break;
case SIGP_INITIAL_CPU_RESET:
vcpu->stat.instruction_sigp_init_cpu_reset++;
rc = __prepare_sigp_cpu_reset(vcpu, dst_vcpu, order_code);
break;
case SIGP_CPU_RESET:
vcpu->stat.instruction_sigp_cpu_reset++;
rc = __prepare_sigp_cpu_reset(vcpu, dst_vcpu, order_code);
break;
default:
vcpu->stat.instruction_sigp_unknown++;
rc = __prepare_sigp_unknown(vcpu, dst_vcpu);
}
if (rc == -EOPNOTSUPP)
VCPU_EVENT(vcpu, 4,
"sigp order %u -> cpu %x: handled in user space",
order_code, dst_vcpu->vcpu_id);
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_SET_ARCHITECTURE:
vcpu->stat.instruction_sigp_arch++;
rc = __sigp_set_arch(vcpu, parameter);
break;
default:
rc = handle_sigp_dst(vcpu, order_code, cpu_addr,
parameter,
&vcpu->run->s.regs.gprs[r1]);
}
if (rc < 0)
return rc;
kvm_s390_set_psw_cc(vcpu, rc);
return 0;
}
/*
* Handle SIGP partial execution interception.
*
* This interception will occur at the source cpu when a source cpu sends an
* external call to a target cpu and the target cpu has the WAIT bit set in
* its cpuflags. Interception will occurr after the interrupt indicator bits at
* the target cpu have been set. All error cases will lead to instruction
* interception, therefore nothing is to be checked or prepared.
*/
int kvm_s390_handle_sigp_pei(struct kvm_vcpu *vcpu)
{
int r3 = vcpu->arch.sie_block->ipa & 0x000f;
u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
struct kvm_vcpu *dest_vcpu;
u8 order_code = kvm_s390_get_base_disp_rs(vcpu);
trace_kvm_s390_handle_sigp_pei(vcpu, order_code, cpu_addr);
if (order_code == SIGP_EXTERNAL_CALL) {
dest_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
BUG_ON(dest_vcpu == NULL);
kvm_s390_vcpu_wakeup(dest_vcpu);
kvm_s390_set_psw_cc(vcpu, SIGP_CC_ORDER_CODE_ACCEPTED);
return 0;
}
return -EOPNOTSUPP;
}
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