mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-14 12:49:08 +00:00
KVM: s390: interprocessor communication via sigp
This patch introduces in-kernel handling of _some_ sigp interprocessor
signals (similar to ipi).
kvm_s390_handle_sigp() decodes the sigp instruction and calls individual
handlers depending on the operation requested:
- sigp sense tries to retrieve information such as existence or running state
of the remote cpu
- sigp emergency sends an external interrupt to the remove cpu
- sigp stop stops a remove cpu
- sigp stop store status stops a remote cpu, and stores its entire internal
state to the cpus lowcore
- sigp set arch sets the architecture mode of the remote cpu. setting to
ESAME (s390x 64bit) is accepted, setting to ESA/S390 (s390, 31 or 24 bit) is
denied, all others are passed to userland
- sigp set prefix sets the prefix register of a remote cpu
For implementation of this, the stop intercept indication starts to get reused
on purpose: a set of action bits defines what to do once a cpu gets stopped:
ACTION_STOP_ON_STOP really stops the cpu when a stop intercept is recognized
ACTION_STORE_ON_STOP stores the cpu status to lowcore when a stop intercept is
recognized
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Christian Borntraeger
Avi Kivity
parent
453423dce2
commit
5288fbf0ef
@ -10,5 +10,5 @@ common-objs = $(addprefix ../../../virt/kvm/, kvm_main.o)
|
||||
|
||||
EXTRA_CFLAGS += -Ivirt/kvm -Iarch/s390/kvm
|
||||
|
||||
kvm-objs := $(common-objs) kvm-s390.o sie64a.o intercept.o interrupt.o priv.o
|
||||
kvm-objs := $(common-objs) kvm-s390.o sie64a.o intercept.o interrupt.o priv.o sigp.o
|
||||
obj-$(CONFIG_KVM) += kvm.o
|
||||
|
||||
@ -95,6 +95,7 @@ static int handle_lctl(struct kvm_vcpu *vcpu)
|
||||
}
|
||||
|
||||
static intercept_handler_t instruction_handlers[256] = {
|
||||
[0xae] = kvm_s390_handle_sigp,
|
||||
[0xb2] = kvm_s390_handle_priv,
|
||||
[0xb7] = handle_lctl,
|
||||
[0xeb] = handle_lctg,
|
||||
@ -117,10 +118,27 @@ static int handle_noop(struct kvm_vcpu *vcpu)
|
||||
|
||||
static int handle_stop(struct kvm_vcpu *vcpu)
|
||||
{
|
||||
int rc;
|
||||
|
||||
vcpu->stat.exit_stop_request++;
|
||||
VCPU_EVENT(vcpu, 3, "%s", "cpu stopped");
|
||||
atomic_clear_mask(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
|
||||
return -ENOTSUPP;
|
||||
spin_lock_bh(&vcpu->arch.local_int.lock);
|
||||
if (vcpu->arch.local_int.action_bits & ACTION_STORE_ON_STOP) {
|
||||
vcpu->arch.local_int.action_bits &= ~ACTION_STORE_ON_STOP;
|
||||
rc = __kvm_s390_vcpu_store_status(vcpu,
|
||||
KVM_S390_STORE_STATUS_NOADDR);
|
||||
if (rc >= 0)
|
||||
rc = -ENOTSUPP;
|
||||
}
|
||||
|
||||
if (vcpu->arch.local_int.action_bits & ACTION_STOP_ON_STOP) {
|
||||
vcpu->arch.local_int.action_bits &= ~ACTION_STOP_ON_STOP;
|
||||
VCPU_EVENT(vcpu, 3, "%s", "cpu stopped");
|
||||
rc = -ENOTSUPP;
|
||||
} else
|
||||
rc = 0;
|
||||
spin_unlock_bh(&vcpu->arch.local_int.lock);
|
||||
return rc;
|
||||
}
|
||||
|
||||
static int handle_validity(struct kvm_vcpu *vcpu)
|
||||
|
||||
@ -57,6 +57,12 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
|
||||
{ "instruction_chsc", VCPU_STAT(instruction_chsc) },
|
||||
{ "instruction_stsi", VCPU_STAT(instruction_stsi) },
|
||||
{ "instruction_stfl", VCPU_STAT(instruction_stfl) },
|
||||
{ "instruction_sigp_sense", VCPU_STAT(instruction_sigp_sense) },
|
||||
{ "instruction_sigp_emergency", VCPU_STAT(instruction_sigp_emergency) },
|
||||
{ "instruction_sigp_stop", VCPU_STAT(instruction_sigp_stop) },
|
||||
{ "instruction_sigp_set_arch", VCPU_STAT(instruction_sigp_arch) },
|
||||
{ "instruction_sigp_set_prefix", VCPU_STAT(instruction_sigp_prefix) },
|
||||
{ "instruction_sigp_restart", VCPU_STAT(instruction_sigp_restart) },
|
||||
{ NULL }
|
||||
};
|
||||
|
||||
@ -287,6 +293,7 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
|
||||
spin_lock_bh(&kvm->arch.float_int.lock);
|
||||
kvm->arch.float_int.local_int[id] = &vcpu->arch.local_int;
|
||||
init_waitqueue_head(&vcpu->arch.local_int.wq);
|
||||
vcpu->arch.local_int.cpuflags = &vcpu->arch.sie_block->cpuflags;
|
||||
spin_unlock_bh(&kvm->arch.float_int.lock);
|
||||
|
||||
rc = kvm_vcpu_init(vcpu, kvm, id);
|
||||
|
||||
@ -51,4 +51,11 @@ int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code);
|
||||
|
||||
/* implemented in priv.c */
|
||||
int kvm_s390_handle_priv(struct kvm_vcpu *vcpu);
|
||||
|
||||
/* implemented in sigp.c */
|
||||
int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu);
|
||||
|
||||
/* implemented in kvm-s390.c */
|
||||
int __kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu,
|
||||
unsigned long addr);
|
||||
#endif
|
||||
|
||||
288
arch/s390/kvm/sigp.c
Normal file
288
arch/s390/kvm/sigp.c
Normal file
@ -0,0 +1,288 @@
|
||||
/*
|
||||
* sigp.c - handlinge interprocessor communication
|
||||
*
|
||||
* Copyright IBM Corp. 2008
|
||||
*
|
||||
* 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>
|
||||
*/
|
||||
|
||||
#include <linux/kvm.h>
|
||||
#include <linux/kvm_host.h>
|
||||
#include "gaccess.h"
|
||||
#include "kvm-s390.h"
|
||||
|
||||
/* sigp order codes */
|
||||
#define SIGP_SENSE 0x01
|
||||
#define SIGP_EXTERNAL_CALL 0x02
|
||||
#define SIGP_EMERGENCY 0x03
|
||||
#define SIGP_START 0x04
|
||||
#define SIGP_STOP 0x05
|
||||
#define SIGP_RESTART 0x06
|
||||
#define SIGP_STOP_STORE_STATUS 0x09
|
||||
#define SIGP_INITIAL_CPU_RESET 0x0b
|
||||
#define SIGP_CPU_RESET 0x0c
|
||||
#define SIGP_SET_PREFIX 0x0d
|
||||
#define SIGP_STORE_STATUS_ADDR 0x0e
|
||||
#define SIGP_SET_ARCH 0x12
|
||||
|
||||
/* cpu status bits */
|
||||
#define SIGP_STAT_EQUIPMENT_CHECK 0x80000000UL
|
||||
#define SIGP_STAT_INCORRECT_STATE 0x00000200UL
|
||||
#define SIGP_STAT_INVALID_PARAMETER 0x00000100UL
|
||||
#define SIGP_STAT_EXT_CALL_PENDING 0x00000080UL
|
||||
#define SIGP_STAT_STOPPED 0x00000040UL
|
||||
#define SIGP_STAT_OPERATOR_INTERV 0x00000020UL
|
||||
#define SIGP_STAT_CHECK_STOP 0x00000010UL
|
||||
#define SIGP_STAT_INOPERATIVE 0x00000004UL
|
||||
#define SIGP_STAT_INVALID_ORDER 0x00000002UL
|
||||
#define SIGP_STAT_RECEIVER_CHECK 0x00000001UL
|
||||
|
||||
|
||||
static int __sigp_sense(struct kvm_vcpu *vcpu, u16 cpu_addr, u64 *reg)
|
||||
{
|
||||
struct float_interrupt *fi = &vcpu->kvm->arch.float_int;
|
||||
int rc;
|
||||
|
||||
if (cpu_addr >= KVM_MAX_VCPUS)
|
||||
return 3; /* not operational */
|
||||
|
||||
spin_lock_bh(&fi->lock);
|
||||
if (fi->local_int[cpu_addr] == NULL)
|
||||
rc = 3; /* not operational */
|
||||
else if (atomic_read(fi->local_int[cpu_addr]->cpuflags)
|
||||
& CPUSTAT_RUNNING) {
|
||||
*reg &= 0xffffffff00000000UL;
|
||||
rc = 1; /* status stored */
|
||||
} else {
|
||||
*reg &= 0xffffffff00000000UL;
|
||||
*reg |= SIGP_STAT_STOPPED;
|
||||
rc = 1; /* status stored */
|
||||
}
|
||||
spin_unlock_bh(&fi->lock);
|
||||
|
||||
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 float_interrupt *fi = &vcpu->kvm->arch.float_int;
|
||||
struct local_interrupt *li;
|
||||
struct interrupt_info *inti;
|
||||
int rc;
|
||||
|
||||
if (cpu_addr >= KVM_MAX_VCPUS)
|
||||
return 3; /* not operational */
|
||||
|
||||
inti = kzalloc(sizeof(*inti), GFP_KERNEL);
|
||||
if (!inti)
|
||||
return -ENOMEM;
|
||||
|
||||
inti->type = KVM_S390_INT_EMERGENCY;
|
||||
|
||||
spin_lock_bh(&fi->lock);
|
||||
li = fi->local_int[cpu_addr];
|
||||
if (li == NULL) {
|
||||
rc = 3; /* not operational */
|
||||
kfree(inti);
|
||||
goto unlock;
|
||||
}
|
||||
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);
|
||||
rc = 0; /* order accepted */
|
||||
unlock:
|
||||
spin_unlock_bh(&fi->lock);
|
||||
VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x", cpu_addr);
|
||||
return rc;
|
||||
}
|
||||
|
||||
static int __sigp_stop(struct kvm_vcpu *vcpu, u16 cpu_addr, int store)
|
||||
{
|
||||
struct float_interrupt *fi = &vcpu->kvm->arch.float_int;
|
||||
struct local_interrupt *li;
|
||||
struct interrupt_info *inti;
|
||||
int rc;
|
||||
|
||||
if (cpu_addr >= KVM_MAX_VCPUS)
|
||||
return 3; /* not operational */
|
||||
|
||||
inti = kzalloc(sizeof(*inti), GFP_KERNEL);
|
||||
if (!inti)
|
||||
return -ENOMEM;
|
||||
|
||||
inti->type = KVM_S390_SIGP_STOP;
|
||||
|
||||
spin_lock_bh(&fi->lock);
|
||||
li = fi->local_int[cpu_addr];
|
||||
if (li == NULL) {
|
||||
rc = 3; /* not operational */
|
||||
kfree(inti);
|
||||
goto unlock;
|
||||
}
|
||||
spin_lock_bh(&li->lock);
|
||||
list_add_tail(&inti->list, &li->list);
|
||||
atomic_set(&li->active, 1);
|
||||
atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
|
||||
if (store)
|
||||
li->action_bits |= ACTION_STORE_ON_STOP;
|
||||
li->action_bits |= ACTION_STOP_ON_STOP;
|
||||
if (waitqueue_active(&li->wq))
|
||||
wake_up_interruptible(&li->wq);
|
||||
spin_unlock_bh(&li->lock);
|
||||
rc = 0; /* order accepted */
|
||||
unlock:
|
||||
spin_unlock_bh(&fi->lock);
|
||||
VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", cpu_addr);
|
||||
return rc;
|
||||
}
|
||||
|
||||
static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
|
||||
{
|
||||
int rc;
|
||||
|
||||
switch (parameter & 0xff) {
|
||||
case 0:
|
||||
printk(KERN_WARNING "kvm: request to switch to ESA/390 mode"
|
||||
" not supported");
|
||||
rc = 3; /* not operational */
|
||||
break;
|
||||
case 1:
|
||||
case 2:
|
||||
rc = 0; /* order accepted */
|
||||
break;
|
||||
default:
|
||||
rc = -ENOTSUPP;
|
||||
}
|
||||
return rc;
|
||||
}
|
||||
|
||||
static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
|
||||
u64 *reg)
|
||||
{
|
||||
struct float_interrupt *fi = &vcpu->kvm->arch.float_int;
|
||||
struct local_interrupt *li;
|
||||
struct interrupt_info *inti;
|
||||
int rc;
|
||||
u8 tmp;
|
||||
|
||||
/* make sure that the new value is valid memory */
|
||||
address = address & 0x7fffe000u;
|
||||
if ((copy_from_guest(vcpu, &tmp,
|
||||
(u64) (address + vcpu->kvm->arch.guest_origin) , 1)) ||
|
||||
(copy_from_guest(vcpu, &tmp, (u64) (address +
|
||||
vcpu->kvm->arch.guest_origin + PAGE_SIZE), 1))) {
|
||||
*reg |= SIGP_STAT_INVALID_PARAMETER;
|
||||
return 1; /* invalid parameter */
|
||||
}
|
||||
|
||||
inti = kzalloc(sizeof(*inti), GFP_KERNEL);
|
||||
if (!inti)
|
||||
return 2; /* busy */
|
||||
|
||||
spin_lock_bh(&fi->lock);
|
||||
li = fi->local_int[cpu_addr];
|
||||
|
||||
if ((cpu_addr >= KVM_MAX_VCPUS) || (li == NULL)) {
|
||||
rc = 1; /* incorrect state */
|
||||
*reg &= SIGP_STAT_INCORRECT_STATE;
|
||||
kfree(inti);
|
||||
goto out_fi;
|
||||
}
|
||||
|
||||
spin_lock_bh(&li->lock);
|
||||
/* cpu must be in stopped state */
|
||||
if (atomic_read(li->cpuflags) & CPUSTAT_RUNNING) {
|
||||
rc = 1; /* incorrect state */
|
||||
*reg &= SIGP_STAT_INCORRECT_STATE;
|
||||
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 = 0; /* order accepted */
|
||||
|
||||
VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", cpu_addr, address);
|
||||
out_li:
|
||||
spin_unlock_bh(&li->lock);
|
||||
out_fi:
|
||||
spin_unlock_bh(&fi->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;
|
||||
int base2 = vcpu->arch.sie_block->ipb >> 28;
|
||||
int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
|
||||
u32 parameter;
|
||||
u16 cpu_addr = vcpu->arch.guest_gprs[r3];
|
||||
u8 order_code;
|
||||
int rc;
|
||||
|
||||
order_code = disp2;
|
||||
if (base2)
|
||||
order_code += vcpu->arch.guest_gprs[base2];
|
||||
|
||||
if (r1 % 2)
|
||||
parameter = vcpu->arch.guest_gprs[r1];
|
||||
else
|
||||
parameter = vcpu->arch.guest_gprs[r1 + 1];
|
||||
|
||||
switch (order_code) {
|
||||
case SIGP_SENSE:
|
||||
vcpu->stat.instruction_sigp_sense++;
|
||||
rc = __sigp_sense(vcpu, cpu_addr,
|
||||
&vcpu->arch.guest_gprs[r1]);
|
||||
break;
|
||||
case SIGP_EMERGENCY:
|
||||
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, 0);
|
||||
break;
|
||||
case SIGP_STOP_STORE_STATUS:
|
||||
vcpu->stat.instruction_sigp_stop++;
|
||||
rc = __sigp_stop(vcpu, cpu_addr, 1);
|
||||
break;
|
||||
case SIGP_SET_ARCH:
|
||||
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->arch.guest_gprs[r1]);
|
||||
break;
|
||||
case SIGP_RESTART:
|
||||
vcpu->stat.instruction_sigp_restart++;
|
||||
/* user space must know about restart */
|
||||
default:
|
||||
return -ENOTSUPP;
|
||||
}
|
||||
|
||||
if (rc < 0)
|
||||
return rc;
|
||||
|
||||
vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
|
||||
vcpu->arch.sie_block->gpsw.mask |= (rc & 3ul) << 44;
|
||||
return 0;
|
||||
}
|
||||
@ -128,6 +128,12 @@ struct kvm_vcpu_stat {
|
||||
u32 instruction_chsc;
|
||||
u32 instruction_stsi;
|
||||
u32 instruction_stfl;
|
||||
u32 instruction_sigp_sense;
|
||||
u32 instruction_sigp_emergency;
|
||||
u32 instruction_sigp_stop;
|
||||
u32 instruction_sigp_arch;
|
||||
u32 instruction_sigp_prefix;
|
||||
u32 instruction_sigp_restart;
|
||||
};
|
||||
|
||||
struct io_info {
|
||||
@ -169,6 +175,10 @@ struct interrupt_info {
|
||||
};
|
||||
};
|
||||
|
||||
/* for local_interrupt.action_flags */
|
||||
#define ACTION_STORE_ON_STOP 1
|
||||
#define ACTION_STOP_ON_STOP 2
|
||||
|
||||
struct local_interrupt {
|
||||
spinlock_t lock;
|
||||
struct list_head list;
|
||||
@ -176,6 +186,8 @@ struct local_interrupt {
|
||||
struct float_interrupt *float_int;
|
||||
int timer_due; /* event indicator for waitqueue below */
|
||||
wait_queue_head_t wq;
|
||||
atomic_t *cpuflags;
|
||||
unsigned int action_bits;
|
||||
};
|
||||
|
||||
struct float_interrupt {
|
||||
|
||||
Loading…
Reference in New Issue
Block a user