From: "Eugene (jno) Dvurechenski" <j...@linux.vnet.ibm.com>
This patch generalizes access to the SIGP controls, which is a part of SCA.
This is to prepare for upcoming introduction of Extended SCA support.
Signed-off-by: Eugene (jno) Dvurechenski <j...@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntrae...@de.ibm.com>
---
arch/s390/kvm/interrupt.c | 72 +++++++++++++++++++++++++++++------------------
1 file changed, 45 insertions(+), 27 deletions(-)
diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index 6a75352..2a4718a 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -34,6 +34,45 @@
#define PFAULT_DONE 0x0680
#define VIRTIO_PARAM 0x0d00
+/* handle external calls via sigp interpretation facility */
+static int sca_ext_call_pending(struct kvm_vcpu *vcpu, int *src_id)
+{
+ struct sca_block *sca = vcpu->kvm->arch.sca;
+ uint8_t sigp_ctrl = sca->cpu[vcpu->vcpu_id].sigp_ctrl;
+
+ if (src_id)
+ *src_id = sigp_ctrl & SIGP_CTRL_SCN_MASK;
+
+ return sigp_ctrl & SIGP_CTRL_C &&
+ atomic_read(&vcpu->arch.sie_block->cpuflags) &
+ CPUSTAT_ECALL_PEND;
+}
+
+static int sca_inject_ext_call(struct kvm_vcpu *vcpu, int src_id)
+{
+ struct sca_block *sca = vcpu->kvm->arch.sca;
+ uint8_t *sigp_ctrl = &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
+ uint8_t new_val = SIGP_CTRL_C | (src_id & SIGP_CTRL_SCN_MASK);
+ uint8_t old_val = *sigp_ctrl & ~SIGP_CTRL_C;
+
+ if (cmpxchg(sigp_ctrl, old_val, new_val) != old_val) {
+ /* another external call is pending */
+ return -EBUSY;
+ }
+ atomic_or(CPUSTAT_ECALL_PEND, &vcpu->arch.sie_block->cpuflags);
+ return 0;
+}
+
+static void sca_clear_ext_call(struct kvm_vcpu *vcpu)
+{
+ struct sca_block *sca = vcpu->kvm->arch.sca;
+ struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+ uint8_t *sigp_ctrl = &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
+
+ atomic_andnot(CPUSTAT_ECALL_PEND, li->cpuflags);
+ *sigp_ctrl = 0;
+}
+
int psw_extint_disabled(struct kvm_vcpu *vcpu)
{
return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
@@ -792,13 +831,11 @@ static const deliver_irq_t deliver_irq_funcs[] = {
int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu)
{
struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
- uint8_t sigp_ctrl = vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl;
if (!sclp.has_sigpif)
return test_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
- return (sigp_ctrl & SIGP_CTRL_C) &&
- (atomic_read(&vcpu->arch.sie_block->cpuflags) &
CPUSTAT_ECALL_PEND);
+ return sca_ext_call_pending(vcpu, NULL);
}
int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop)
@@ -909,9 +946,7 @@ void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
memset(&li->irq, 0, sizeof(li->irq));
spin_unlock(&li->lock);
- /* clear pending external calls set by sigp interpretation facility */
- atomic_andnot(CPUSTAT_ECALL_PEND, li->cpuflags);
- vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl = 0;
+ sca_clear_ext_call(vcpu);
}
int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
@@ -1003,21 +1038,6 @@ static int __inject_pfault_init(struct kvm_vcpu *vcpu,
struct kvm_s390_irq *irq)
return 0;
}
-static int __inject_extcall_sigpif(struct kvm_vcpu *vcpu, uint16_t src_id)
-{
- unsigned char new_val, old_val;
- uint8_t *sigp_ctrl = &vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl;
-
- new_val = SIGP_CTRL_C | (src_id & SIGP_CTRL_SCN_MASK);
- old_val = *sigp_ctrl & ~SIGP_CTRL_C;
- if (cmpxchg(sigp_ctrl, old_val, new_val) != old_val) {
- /* another external call is pending */
- return -EBUSY;
- }
- atomic_or(CPUSTAT_ECALL_PEND, &vcpu->arch.sie_block->cpuflags);
- return 0;
-}
-
static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
{
struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
@@ -1034,7 +1054,7 @@ static int __inject_extcall(struct kvm_vcpu *vcpu, struct
kvm_s390_irq *irq)
return -EINVAL;
if (sclp.has_sigpif)
- return __inject_extcall_sigpif(vcpu, src_id);
+ return sca_inject_ext_call(vcpu, src_id);
if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs))
return -EBUSY;
@@ -2203,7 +2223,7 @@ static void store_local_irq(struct
kvm_s390_local_interrupt *li,
int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len)
{
- uint8_t sigp_ctrl = vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl;
+ int scn;
unsigned long sigp_emerg_pending[BITS_TO_LONGS(KVM_MAX_VCPUS)];
struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
unsigned long pending_irqs;
@@ -2243,14 +2263,12 @@ int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8
__user *buf, int len)
}
}
- if ((sigp_ctrl & SIGP_CTRL_C) &&
- (atomic_read(&vcpu->arch.sie_block->cpuflags) &
- CPUSTAT_ECALL_PEND)) {
+ if (sca_ext_call_pending(vcpu, &scn)) {
if (n + sizeof(irq) > len)
return -ENOBUFS;
memset(&irq, 0, sizeof(irq));
irq.type = KVM_S390_INT_EXTERNAL_CALL;
- irq.u.extcall.code = sigp_ctrl & SIGP_CTRL_SCN_MASK;
+ irq.u.extcall.code = scn;
if (copy_to_user(&buf[n], &irq, sizeof(irq)))
return -EFAULT;
n += sizeof(irq);
--
2.3.0
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