These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / arch / arm64 / kvm / guest.c

diff --git a/kernel/arch/arm64/kvm/guest.c b/kernel/arch/arm64/kvm/guest.c
index 9535bd5..3039f08 100644 (file)
--- a/kernel/arch/arm64/kvm/guest.c
+++ b/kernel/arch/arm64/kvm/guest.c
@@ -32,6 +32,8 @@
 #include <asm/kvm_emulate.h>
 #include <asm/kvm_coproc.h>
 
+#include "trace.h"
+
 struct kvm_stats_debugfs_item debugfs_entries[] = {
        { NULL }
 };
@@ -184,7 +186,7 @@ static int get_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
        u64 val;
 
        val = kvm_arm_timer_get_reg(vcpu, reg->id);
-       return copy_to_user(uaddr, &val, KVM_REG_SIZE(reg->id));
+       return copy_to_user(uaddr, &val, KVM_REG_SIZE(reg->id)) ? -EFAULT : 0;
 }
 
 /**
@@ -293,7 +295,8 @@ int __attribute_const__ kvm_target_cpu(void)
                break;
        };
 
-       return -EINVAL;
+       /* Return a default generic target */
+       return KVM_ARM_TARGET_GENERIC_V8;
 }
 
 int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init)
@@ -331,3 +334,41 @@ int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
 {
        return -EINVAL;
 }
+
+#define KVM_GUESTDBG_VALID_MASK (KVM_GUESTDBG_ENABLE |    \
+                           KVM_GUESTDBG_USE_SW_BP | \
+                           KVM_GUESTDBG_USE_HW | \
+                           KVM_GUESTDBG_SINGLESTEP)
+
+/**
+ * kvm_arch_vcpu_ioctl_set_guest_debug - set up guest debugging
+ * @kvm:       pointer to the KVM struct
+ * @kvm_guest_debug: the ioctl data buffer
+ *
+ * This sets up and enables the VM for guest debugging. Userspace
+ * passes in a control flag to enable different debug types and
+ * potentially other architecture specific information in the rest of
+ * the structure.
+ */
+int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
+                                       struct kvm_guest_debug *dbg)
+{
+       trace_kvm_set_guest_debug(vcpu, dbg->control);
+
+       if (dbg->control & ~KVM_GUESTDBG_VALID_MASK)
+               return -EINVAL;
+
+       if (dbg->control & KVM_GUESTDBG_ENABLE) {
+               vcpu->guest_debug = dbg->control;
+
+               /* Hardware assisted Break and Watch points */
+               if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW) {
+                       vcpu->arch.external_debug_state = dbg->arch;
+               }
+
+       } else {
+               /* If not enabled clear all flags */
+               vcpu->guest_debug = 0;
+       }
+       return 0;
+}