kvm: use configs/ definition to conditionalize debug support

If an architecture adds support for KVM_CAP_SET_GUEST_DEBUG but QEMU does not
have the necessary code, QEMU will fail to build after updating kernel headers.
Avoid this by using a #define in config-target.h instead of KVM_CAP_SET_GUEST_DEBUG.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

accel/kvm/kvm-accel-ops.c

@@ -85,7 +85,7 @@ static bool kvm_cpus_are_resettable(void)
     return !kvm_enabled() || kvm_cpu_check_are_resettable();
 }
 
-#ifdef KVM_CAP_SET_GUEST_DEBUG
+#ifdef TARGET_KVM_HAVE_GUEST_DEBUG
 static int kvm_update_guest_debug_ops(CPUState *cpu)
 {
     return kvm_update_guest_debug(cpu, 0);
@@ -104,7 +104,7 @@ static void kvm_accel_ops_class_init(ObjectClass *oc, void *data)
     ops->synchronize_state = kvm_cpu_synchronize_state;
     ops->synchronize_pre_loadvm = kvm_cpu_synchronize_pre_loadvm;
 
-#ifdef KVM_CAP_SET_GUEST_DEBUG
+#ifdef TARGET_KVM_HAVE_GUEST_DEBUG
     ops->update_guest_debug = kvm_update_guest_debug_ops;
     ops->supports_guest_debug = kvm_supports_guest_debug;
     ops->insert_breakpoint = kvm_insert_breakpoint;

accel/kvm/kvm-all.c

@@ -2360,7 +2360,7 @@ static int kvm_init(MachineState *ms)
     s->sigmask_len = 8;
     accel_blocker_init();
 
-#ifdef KVM_CAP_SET_GUEST_DEBUG
+#ifdef TARGET_KVM_HAVE_GUEST_DEBUG
     QTAILQ_INIT(&s->kvm_sw_breakpoints);
 #endif
     QLIST_INIT(&s->kvm_parked_vcpus);
@@ -2544,7 +2544,7 @@ static int kvm_init(MachineState *ms)
     kvm_vm_attributes_allowed =
         (kvm_check_extension(s, KVM_CAP_VM_ATTRIBUTES) > 0);
 
-#ifdef KVM_CAP_SET_GUEST_DEBUG
+#ifdef TARGET_KVM_HAVE_GUEST_DEBUG
     kvm_has_guest_debug =
         (kvm_check_extension(s, KVM_CAP_SET_GUEST_DEBUG) > 0);
 #endif
@@ -2553,7 +2553,7 @@ static int kvm_init(MachineState *ms)
     if (kvm_has_guest_debug) {
         kvm_sstep_flags = SSTEP_ENABLE;
 
-#if defined KVM_CAP_SET_GUEST_DEBUG2
+#if defined TARGET_KVM_HAVE_GUEST_DEBUG
         int guest_debug_flags =
             kvm_check_extension(s, KVM_CAP_SET_GUEST_DEBUG2);
 
@@ -3157,7 +3157,7 @@ bool kvm_arm_supports_user_irq(void)
     return kvm_check_extension(kvm_state, KVM_CAP_ARM_USER_IRQ);
 }
 
-#ifdef KVM_CAP_SET_GUEST_DEBUG
+#ifdef TARGET_KVM_HAVE_GUEST_DEBUG
 struct kvm_sw_breakpoint *kvm_find_sw_breakpoint(CPUState *cpu, vaddr pc)
 {
     struct kvm_sw_breakpoint *bp;
@@ -3317,7 +3317,7 @@ void kvm_remove_all_breakpoints(CPUState *cpu)
     }
 }
 
-#endif /* !KVM_CAP_SET_GUEST_DEBUG */
+#endif /* !TARGET_KVM_HAVE_GUEST_DEBUG */
 
 static int kvm_set_signal_mask(CPUState *cpu, const sigset_t *sigset)
 {

configs/targets/aarch64-softmmu.mak

@@ -1,5 +1,6 @@
 TARGET_ARCH=aarch64
 TARGET_BASE_ARCH=arm
 TARGET_SUPPORTS_MTTCG=y
+TARGET_KVM_HAVE_GUEST_DEBUG=y
 TARGET_XML_FILES= gdb-xml/aarch64-core.xml gdb-xml/aarch64-fpu.xml gdb-xml/arm-core.xml gdb-xml/arm-vfp.xml gdb-xml/arm-vfp3.xml gdb-xml/arm-vfp-sysregs.xml gdb-xml/arm-neon.xml gdb-xml/arm-m-profile.xml gdb-xml/arm-m-profile-mve.xml gdb-xml/aarch64-pauth.xml
 TARGET_NEED_FDT=y

configs/targets/i386-softmmu.mak

@@ -1,4 +1,5 @@
 TARGET_ARCH=i386
 TARGET_SUPPORTS_MTTCG=y
 TARGET_NEED_FDT=y
+TARGET_KVM_HAVE_GUEST_DEBUG=y
 TARGET_XML_FILES= gdb-xml/i386-32bit.xml

configs/targets/ppc-softmmu.mak

@@ -1,4 +1,5 @@
 TARGET_ARCH=ppc
 TARGET_BIG_ENDIAN=y
+TARGET_KVM_HAVE_GUEST_DEBUG=y
 TARGET_XML_FILES= gdb-xml/power-core.xml gdb-xml/power-fpu.xml gdb-xml/power-altivec.xml gdb-xml/power-spe.xml
 TARGET_NEED_FDT=y

configs/targets/ppc64-softmmu.mak

@@ -2,5 +2,6 @@ TARGET_ARCH=ppc64
 TARGET_BASE_ARCH=ppc
 TARGET_BIG_ENDIAN=y
 TARGET_SUPPORTS_MTTCG=y
+TARGET_KVM_HAVE_GUEST_DEBUG=y
 TARGET_XML_FILES= gdb-xml/power64-core.xml gdb-xml/power-fpu.xml gdb-xml/power-altivec.xml gdb-xml/power-spe.xml gdb-xml/power-vsx.xml
 TARGET_NEED_FDT=y

configs/targets/s390x-softmmu.mak

@@ -1,4 +1,5 @@
 TARGET_ARCH=s390x
 TARGET_BIG_ENDIAN=y
 TARGET_SUPPORTS_MTTCG=y
+TARGET_KVM_HAVE_GUEST_DEBUG=y
 TARGET_XML_FILES= gdb-xml/s390x-core64.xml gdb-xml/s390-acr.xml gdb-xml/s390-fpr.xml gdb-xml/s390-vx.xml gdb-xml/s390-cr.xml gdb-xml/s390-virt.xml gdb-xml/s390-virt-kvm.xml gdb-xml/s390-gs.xml

configs/targets/x86_64-softmmu.mak

@@ -2,4 +2,5 @@ TARGET_ARCH=x86_64
 TARGET_BASE_ARCH=i386
 TARGET_SUPPORTS_MTTCG=y
 TARGET_NEED_FDT=y
+TARGET_KVM_HAVE_GUEST_DEBUG=y
 TARGET_XML_FILES= gdb-xml/i386-64bit.xml

include/sysemu/kvm.h

@@ -224,7 +224,7 @@ void kvm_flush_coalesced_mmio_buffer(void);
  * calling down to kvm_arch_update_guest_debug after the generic
  * fields have been set.
  */
-#ifdef KVM_CAP_SET_GUEST_DEBUG
+#ifdef TARGET_KVM_HAVE_GUEST_DEBUG
 int kvm_update_guest_debug(CPUState *cpu, unsigned long reinject_trap);
 #else
 static inline int kvm_update_guest_debug(CPUState *cpu, unsigned long reinject_trap)

include/sysemu/kvm_int.h

@@ -78,7 +78,7 @@ struct KVMState
     struct kvm_coalesced_mmio_ring *coalesced_mmio_ring;
     bool coalesced_flush_in_progress;
     int vcpu_events;
-#ifdef KVM_CAP_SET_GUEST_DEBUG
+#ifdef TARGET_KVM_HAVE_GUEST_DEBUG
     QTAILQ_HEAD(, kvm_sw_breakpoint) kvm_sw_breakpoints;
 #endif
     int max_nested_state_len;