[PATCH 3/7] KVM: arm: guest debug, add stub KVM_SET_GUEST_DEBUG ioctl

[Alex Bennée]

This commit adds a stub function to support the KVM_SET_GUEST_DEBUG
ioctl. Currently any operation flag will return EINVAL. Actual
functionality will be added with further patches.

Signed-off-by: Alex Bennée <alex.ben...@linaro.org>.

diff --git a/Documentation/virtual/kvm/api.txt 
b/Documentation/virtual/kvm/api.txt
index 7610eaa..2c6386e 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -2570,7 +2570,7 @@ handled.
 4.87 KVM_SET_GUEST_DEBUG
 
 Capability: KVM_CAP_SET_GUEST_DEBUG
-Architectures: x86, s390, ppc
+Architectures: x86, s390, ppc, arm64
 Type: vcpu ioctl
 Parameters: struct kvm_guest_debug (in)
 Returns: 0 on success; -1 on error
diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c
index 9e193c8..a0ff410 100644
--- a/arch/arm/kvm/arm.c
+++ b/arch/arm/kvm/arm.c
@@ -180,6 +180,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
        case KVM_CAP_ARM_PSCI:
        case KVM_CAP_ARM_PSCI_0_2:
        case KVM_CAP_READONLY_MEM:
+       case KVM_CAP_SET_GUEST_DEBUG:
                r = 1;
                break;
        case KVM_CAP_COALESCED_MMIO:
@@ -302,7 +303,34 @@ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
                                        struct kvm_guest_debug *dbg)
 {
-       return -EINVAL;
+       /* If it's not enabled clear all flags */
+       if (!(dbg->control & KVM_GUESTDBG_ENABLE)) {
+               vcpu->guest_debug = 0;
+               return 0;
+       }
+
+       vcpu->guest_debug = dbg->control;
+       kvm_info("%s: guest_debug is 0x%lx\n", __func__, vcpu->guest_debug);
+
+       /* Single Step */
+       if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) {
+               kvm_info("SS requested, not yet implemented\n");
+               return -EINVAL;
+       }
+
+       /* Software Break Points */
+       if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP) {
+               kvm_info("SW BP support requested, not yet implemented\n");
+               return -EINVAL;
+       }
+
+       /* Hardware assisted Break and Watch points */
+       if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) {
+               kvm_info("HW BP support requested, not yet implemented\n");
+               return -EINVAL;
+       }
+
+       return 0;
 }
 
 
-- 
2.1.3

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