[patch 07/12] [PATCH] kvm-s390-ucontrol: interface to inject faults on a vcpu page table

[Carsten Otte <cotte@de.ibm.com>]

[-- Attachment #1: guest-fault-interface.patch --]
[-- Type: text/plain, Size: 1469 bytes --]

This patch allows the user to fault in pages on a virtual cpus
address space for user controlled virtual machines. Typically this
is superfluous because userspace can just create a mapping and
let the kernel's page fault logic take are of it. There is one
exception: SIE won't start if the lowcore is not present. Normally
the kernel takes care of this [handle_validity() in
arch/s390/kvm/intercept.c] but since the kernel does not handle
intercepts for user controlled virtual machines, userspace needs to
be able to handle this condition.

Signed-off-by: Carsten Otte <cotte@de.ibm.com>
---
---
 arch/s390/kvm/kvm-s390.c |    6 ++++++
 include/linux/kvm.h      |    1 +
 2 files changed, 7 insertions(+)

--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -777,6 +777,12 @@ long kvm_arch_vcpu_ioctl(struct file *fi
 		break;
 	}
 #endif
+	case KVM_S390_VCPU_FAULT: {
+		r = gmap_fault(arg, vcpu->arch.gmap);
+		if (!IS_ERR_VALUE(r))
+			r = 0;
+		break;
+	}
 	default:
 		r = -EINVAL;
 	}
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -669,6 +669,7 @@ struct kvm_s390_ucas_mapping {
 #define KVM_S390_ENABLE_UCONTROL  _IO(KVMIO,  0x49)
 #define KVM_S390_UCAS_MAP        _IOW(KVMIO, 0x50, struct kvm_s390_ucas_mapping)
 #define KVM_S390_UCAS_UNMAP      _IOW(KVMIO, 0x51, struct kvm_s390_ucas_mapping)
+#define KVM_S390_VCPU_FAULT	 _IOW(KVMIO, 0x52, unsigned long)
 
 /* Device model IOC */
 #define KVM_CREATE_IRQCHIP        _IO(KVMIO,   0x60)