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Diffstat (limited to 'arch/s390/kvm/sigp.c')
-rw-r--r--arch/s390/kvm/sigp.c160
1 files changed, 93 insertions, 67 deletions
diff --git a/arch/s390/kvm/sigp.c b/arch/s390/kvm/sigp.c
index 6651f9f73973..23b1e86b2122 100644
--- a/arch/s390/kvm/sigp.c
+++ b/arch/s390/kvm/sigp.c
@@ -26,15 +26,17 @@ static int __sigp_sense(struct kvm_vcpu *vcpu, struct kvm_vcpu *dst_vcpu,
struct kvm_s390_local_interrupt *li;
int cpuflags;
int rc;
+ int ext_call_pending;
li = &dst_vcpu->arch.local_int;
cpuflags = atomic_read(li->cpuflags);
- if (!(cpuflags & (CPUSTAT_ECALL_PEND | CPUSTAT_STOPPED)))
+ ext_call_pending = kvm_s390_ext_call_pending(dst_vcpu);
+ if (!(cpuflags & CPUSTAT_STOPPED) && !ext_call_pending)
rc = SIGP_CC_ORDER_CODE_ACCEPTED;
else {
*reg &= 0xffffffff00000000UL;
- if (cpuflags & CPUSTAT_ECALL_PEND)
+ if (ext_call_pending)
*reg |= SIGP_STATUS_EXT_CALL_PENDING;
if (cpuflags & CPUSTAT_STOPPED)
*reg |= SIGP_STATUS_STOPPED;
@@ -96,7 +98,7 @@ static int __sigp_conditional_emergency(struct kvm_vcpu *vcpu,
}
static int __sigp_external_call(struct kvm_vcpu *vcpu,
- struct kvm_vcpu *dst_vcpu)
+ struct kvm_vcpu *dst_vcpu, u64 *reg)
{
struct kvm_s390_irq irq = {
.type = KVM_S390_INT_EXTERNAL_CALL,
@@ -105,45 +107,31 @@ static int __sigp_external_call(struct kvm_vcpu *vcpu,
int rc;
rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
- if (!rc)
+ if (rc == -EBUSY) {
+ *reg &= 0xffffffff00000000UL;
+ *reg |= SIGP_STATUS_EXT_CALL_PENDING;
+ return SIGP_CC_STATUS_STORED;
+ } else if (rc == 0) {
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 __inject_sigp_stop(struct kvm_vcpu *dst_vcpu, int action)
-{
- struct kvm_s390_local_interrupt *li = &dst_vcpu->arch.local_int;
- int rc = SIGP_CC_ORDER_CODE_ACCEPTED;
-
- spin_lock(&li->lock);
- if (li->action_bits & ACTION_STOP_ON_STOP) {
- /* another SIGP STOP is pending */
- rc = SIGP_CC_BUSY;
- goto out;
}
- if ((atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) {
- if ((action & ACTION_STORE_ON_STOP) != 0)
- rc = -ESHUTDOWN;
- goto out;
- }
- set_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
- li->action_bits |= action;
- atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
- kvm_s390_vcpu_wakeup(dst_vcpu);
-out:
- spin_unlock(&li->lock);
- return rc;
+ 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 = __inject_sigp_stop(dst_vcpu, ACTION_STOP_ON_STOP);
- VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", dst_vcpu->vcpu_id);
+ 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;
}
@@ -151,20 +139,18 @@ static int __sigp_stop(struct kvm_vcpu *vcpu, struct kvm_vcpu *dst_vcpu)
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 = __inject_sigp_stop(dst_vcpu, ACTION_STOP_ON_STOP |
- ACTION_STORE_ON_STOP);
- VCPU_EVENT(vcpu, 4, "sent sigp stop and store status to cpu %x",
- dst_vcpu->vcpu_id);
-
- if (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);
- }
+ 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;
}
@@ -197,41 +183,33 @@ static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
static int __sigp_set_prefix(struct kvm_vcpu *vcpu, struct kvm_vcpu *dst_vcpu,
u32 address, u64 *reg)
{
- struct kvm_s390_local_interrupt *li;
+ struct kvm_s390_irq irq = {
+ .type = KVM_S390_SIGP_SET_PREFIX,
+ .u.prefix.address = address & 0x7fffe000u,
+ };
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)) {
+ if (kvm_is_error_gpa(vcpu->kvm, irq.u.prefix.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)) {
+ rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
+ if (rc == -EBUSY) {
*reg &= 0xffffffff00000000UL;
*reg |= SIGP_STATUS_INCORRECT_STATE;
- rc = SIGP_CC_STATUS_STORED;
- goto out_li;
+ return SIGP_CC_STATUS_STORED;
+ } else if (rc == 0) {
+ VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x",
+ dst_vcpu->vcpu_id, irq.u.prefix.address);
}
- 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;
}
@@ -242,9 +220,7 @@ static int __sigp_store_status_at_addr(struct kvm_vcpu *vcpu,
int flags;
int rc;
- spin_lock(&dst_vcpu->arch.local_int.lock);
flags = atomic_read(dst_vcpu->arch.local_int.cpuflags);
- spin_unlock(&dst_vcpu->arch.local_int.lock);
if (!(flags & CPUSTAT_STOPPED)) {
*reg &= 0xffffffff00000000UL;
*reg |= SIGP_STATUS_INCORRECT_STATE;
@@ -291,8 +267,9 @@ static int __prepare_sigp_re_start(struct kvm_vcpu *vcpu,
/* handle (RE)START in user space */
int rc = -EOPNOTSUPP;
+ /* make sure we don't race with STOP irq injection */
spin_lock(&li->lock);
- if (li->action_bits & ACTION_STOP_ON_STOP)
+ if (kvm_s390_is_stop_irq_pending(dst_vcpu))
rc = SIGP_CC_BUSY;
spin_unlock(&li->lock);
@@ -333,7 +310,7 @@ static int handle_sigp_dst(struct kvm_vcpu *vcpu, u8 order_code,
break;
case SIGP_EXTERNAL_CALL:
vcpu->stat.instruction_sigp_external_call++;
- rc = __sigp_external_call(vcpu, dst_vcpu);
+ rc = __sigp_external_call(vcpu, dst_vcpu, status_reg);
break;
case SIGP_EMERGENCY_SIGNAL:
vcpu->stat.instruction_sigp_emergency++;
@@ -394,6 +371,53 @@ static int handle_sigp_dst(struct kvm_vcpu *vcpu, u8 order_code,
return rc;
}
+static int handle_sigp_order_in_user_space(struct kvm_vcpu *vcpu, u8 order_code)
+{
+ if (!vcpu->kvm->arch.user_sigp)
+ return 0;
+
+ switch (order_code) {
+ case SIGP_SENSE:
+ case SIGP_EXTERNAL_CALL:
+ case SIGP_EMERGENCY_SIGNAL:
+ case SIGP_COND_EMERGENCY_SIGNAL:
+ case SIGP_SENSE_RUNNING:
+ return 0;
+ /* update counters as we're directly dropping to user space */
+ case SIGP_STOP:
+ vcpu->stat.instruction_sigp_stop++;
+ break;
+ case SIGP_STOP_AND_STORE_STATUS:
+ vcpu->stat.instruction_sigp_stop_store_status++;
+ break;
+ case SIGP_STORE_STATUS_AT_ADDRESS:
+ vcpu->stat.instruction_sigp_store_status++;
+ break;
+ case SIGP_SET_PREFIX:
+ vcpu->stat.instruction_sigp_prefix++;
+ break;
+ case SIGP_START:
+ vcpu->stat.instruction_sigp_start++;
+ break;
+ case SIGP_RESTART:
+ vcpu->stat.instruction_sigp_restart++;
+ break;
+ case SIGP_INITIAL_CPU_RESET:
+ vcpu->stat.instruction_sigp_init_cpu_reset++;
+ break;
+ case SIGP_CPU_RESET:
+ vcpu->stat.instruction_sigp_cpu_reset++;
+ break;
+ default:
+ vcpu->stat.instruction_sigp_unknown++;
+ }
+
+ VCPU_EVENT(vcpu, 4, "sigp order %u: completely handled in user space",
+ order_code);
+
+ return 1;
+}
+
int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
{
int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
@@ -408,6 +432,8 @@ int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
order_code = kvm_s390_get_base_disp_rs(vcpu);
+ if (handle_sigp_order_in_user_space(vcpu, order_code))
+ return -EOPNOTSUPP;
if (r1 % 2)
parameter = vcpu->run->s.regs.gprs[r1];