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authorAlex Bennée <alex.bennee@linaro.org>2015-07-07 17:29:55 +0100
committerMarc Zyngier <marc.zyngier@arm.com>2015-07-21 12:47:08 +0100
commit0e6f07f29cfb8d79dbbdb12560a73f7121ba324e (patch)
tree197742d8a93025972dd811b20d8e54da184a8a1b /arch/arm64/kvm/guest.c
parent21b6f32f9471284f6d4621fc8be71719266db557 (diff)
downloadlinux-0e6f07f29cfb8d79dbbdb12560a73f7121ba324e.tar.bz2
KVM: arm: guest debug, add stub KVM_SET_GUEST_DEBUG ioctl
This commit adds a stub function to support the KVM_SET_GUEST_DEBUG ioctl. Any unsupported flag will return -EINVAL. For now, only KVM_GUESTDBG_ENABLE is supported, although it won't have any effects. Signed-off-by: Alex Bennée <alex.bennee@linaro.org>. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'arch/arm64/kvm/guest.c')
-rw-r--r--arch/arm64/kvm/guest.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index 9535bd555d1d..0ba86775235d 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c
@@ -331,3 +331,30 @@ int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
{
return -EINVAL;
}
+
+#define KVM_GUESTDBG_VALID_MASK (KVM_GUESTDBG_ENABLE)
+
+/**
+ * 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)
+{
+ if (dbg->control & ~KVM_GUESTDBG_VALID_MASK)
+ return -EINVAL;
+
+ if (dbg->control & KVM_GUESTDBG_ENABLE) {
+ vcpu->guest_debug = dbg->control;
+ } else {
+ /* If not enabled clear all flags */
+ vcpu->guest_debug = 0;
+ }
+ return 0;
+}