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Commit c6e5f166 authored by Fan Zhang's avatar Fan Zhang Committed by Christian Borntraeger
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KVM: s390: implement the RI support of guest 



This patch adds runtime instrumentation support for KVM guest. We need to
setup a save area for the runtime instrumentation-controls control block(RICCB)
and implement the necessary interfaces to live migrate the guest settings.

We setup the sie control block in a way, that the runtime
instrumentation instructions of a guest are handled by hardware.

We also add a capability KVM_CAP_S390_RI to make this feature opt-in as
it needs migration support.

Signed-off-by: default avatarFan Zhang <zhangfan@linux.vnet.ibm.com>
Acked-by: default avatarCornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
parent c57ee5fa

arch/s390/include/asm/kvm_host.h

+2 −1
Original line number Diff line number Diff line
@@ -217,7 +217,8 @@ struct kvm_s390_sie_block { 
	__u64	pp;			/* 0x01de */

	__u8	reserved1e6[2];		/* 0x01e6 */

	__u64	itdba;			/* 0x01e8 */

	__u8	reserved1f0[16];	/* 0x01f0 */

	__u64   riccbd;			/* 0x01f0 */

	__u8    reserved1f8[8];		/* 0x01f8 */

} __attribute__((packed));



struct kvm_s390_itdb {

arch/s390/include/uapi/asm/kvm.h

+3 −0
Original line number Diff line number Diff line
@@ -153,6 +153,7 @@ struct kvm_guest_debug_arch { 
#define KVM_SYNC_ARCH0  (1UL << 4)

#define KVM_SYNC_PFAULT (1UL << 5)

#define KVM_SYNC_VRS    (1UL << 6)

#define KVM_SYNC_RICCB  (1UL << 7)

/* definition of registers in kvm_run */

struct kvm_sync_regs {

	__u64 prefix;	/* prefix register */
@@ -170,6 +171,8 @@ struct kvm_sync_regs { 
	__u64 vrs[32][2];	/* vector registers */

	__u8  reserved[512];	/* for future vector expansion */

	__u32 fpc;	/* only valid with vector registers */

	__u8 padding[52];	/* riccb needs to be 64byte aligned */

	__u8 riccb[64];		/* runtime instrumentation controls block */

};



#define KVM_REG_S390_TODPR	(KVM_REG_S390 | KVM_REG_SIZE_U32 | 0x1)

arch/s390/kvm/kvm-s390.c

+22 −0
Original line number Diff line number Diff line
@@ -258,6 +258,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) 
	case KVM_CAP_S390_VECTOR_REGISTERS:

		r = MACHINE_HAS_VX;

		break;

	case KVM_CAP_S390_RI:

		r = test_facility(64);

		break;

	default:

		r = 0;

	}
@@ -358,6 +361,20 @@ static int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap) 
		VM_EVENT(kvm, 3, "ENABLE: CAP_S390_VECTOR_REGISTERS %s",

			 r ? "(not available)" : "(success)");

		break;

	case KVM_CAP_S390_RI:

		r = -EINVAL;

		mutex_lock(&kvm->lock);

		if (atomic_read(&kvm->online_vcpus)) {

			r = -EBUSY;

		} else if (test_facility(64)) {

			set_kvm_facility(kvm->arch.model.fac->mask, 64);

			set_kvm_facility(kvm->arch.model.fac->list, 64);

			r = 0;

		}

		mutex_unlock(&kvm->lock);

		VM_EVENT(kvm, 3, "ENABLE: CAP_S390_RI %s",

			 r ? "(not available)" : "(success)");

		break;

	case KVM_CAP_S390_USER_STSI:

		VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_STSI");

		kvm->arch.user_stsi = 1;
@@ -1395,6 +1412,8 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) 
				    KVM_SYNC_CRS |

				    KVM_SYNC_ARCH0 |

				    KVM_SYNC_PFAULT;

	if (test_kvm_facility(vcpu->kvm, 64))

		vcpu->run->kvm_valid_regs |= KVM_SYNC_RICCB;

	if (test_kvm_facility(vcpu->kvm, 129))

		vcpu->run->kvm_valid_regs |= KVM_SYNC_VRS;
@@ -1578,10 +1597,13 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu) 
		vcpu->arch.sie_block->eca |= 1;

	if (sclp.has_sigpif)

		vcpu->arch.sie_block->eca |= 0x10000000U;

	if (test_kvm_facility(vcpu->kvm, 64))

		vcpu->arch.sie_block->ecb3 |= 0x01;

	if (test_kvm_facility(vcpu->kvm, 129)) {

		vcpu->arch.sie_block->eca |= 0x00020000;

		vcpu->arch.sie_block->ecd |= 0x20000000;

	}

	vcpu->arch.sie_block->riccbd = (unsigned long) &vcpu->run->s.regs.riccb;

	vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;



	if (vcpu->kvm->arch.use_cmma) {

include/uapi/linux/kvm.h

+1 −0
Original line number Diff line number Diff line
@@ -849,6 +849,7 @@ struct kvm_ppc_smmu_info { 
#define KVM_CAP_SPLIT_IRQCHIP 121

#define KVM_CAP_IOEVENTFD_ANY_LENGTH 122

#define KVM_CAP_HYPERV_SYNIC 123

#define KVM_CAP_S390_RI 124



#ifdef KVM_CAP_IRQ_ROUTING