[PATCH 2/2] hw/riscv/virt.c: fix non-KVM --enable-debug build

[Daniel Henrique Barboza <dbarboza@ventanamicro.com>]

A build with --enable-debug and without KVM will fail as follows:

/usr/bin/ld: libqemu-riscv64-softmmu.fa.p/hw_riscv_virt.c.o: in function `virt_machine_init':
./qemu/build/../hw/riscv/virt.c:1465: undefined reference to `kvm_riscv_aia_create'

This happens because the code block with "if virt_use_kvm_aia(s)" isn't
being ignored by the debug build, resulting in an undefined reference to
a KVM only function.

Add a stub for kvm_riscv_aia_create() in kvm_riscv.h when CONFIG_KVM is
false. Adding it as an inline instead of using kvm-stubs.c will make it
easier in the future to remember to add stubs for kvm functions that are
used in multiple accelerator code.

Fixes: dbdb99948e ("target/riscv: select KVM AIA in riscv virt machine")
Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
---
 target/riscv/kvm_riscv.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/target/riscv/kvm_riscv.h b/target/riscv/kvm_riscv.h
index 7d4b7c60e2..01be45cc69 100644
--- a/target/riscv/kvm_riscv.h
+++ b/target/riscv/kvm_riscv.h
@@ -22,9 +22,19 @@
 void kvm_riscv_init_user_properties(Object *cpu_obj);
 void kvm_riscv_reset_vcpu(RISCVCPU *cpu);
 void kvm_riscv_set_irq(RISCVCPU *cpu, int irq, int level);
+
+#ifdef CONFIG_KVM
 void kvm_riscv_aia_create(MachineState *machine, uint64_t group_shift,
                           uint64_t aia_irq_num, uint64_t aia_msi_num,
                           uint64_t aplic_base, uint64_t imsic_base,
                           uint64_t guest_num);
+#else
+static inline void kvm_riscv_aia_create(MachineState *machine,
+                                uint64_t group_shift, uint64_t aia_irq_num,
+                                uint64_t aia_msi_num, uint64_t aplic_base,
+                                uint64_t imsic_base, uint64_t guest_num) {
+    g_assert_not_reached();
+}
+#endif
 
 #endif
-- 
2.41.0