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>

1 files changed, 288 insertions, 0 deletions

diff --git a/arch/s390/kvm/sigp.c b/arch/s390/kvm/sigp.c
new file mode 100644
index 000000000000..0a236acfb5f6
--- /dev/null
+++ b/arch/s390/kvm/sigp.c
@@ -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;
+}