[RFC PATCH-for-10.1 27/39] system/hvf: Expose hvf_enabled() to common code

["Philippe Mathieu-Daudé" <philmd@linaro.org>]

Currently hvf_enabled() is restricted to target-specific code.
By defining CONFIG_HVF_IS_POSSIBLE we allow its use anywhere.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 MAINTAINERS             |  1 +
 include/system/hvf.h    | 14 +++++++++-----
 accel/stubs/hvf-stub.c  | 12 ++++++++++++
 accel/stubs/meson.build |  1 +
 4 files changed, 23 insertions(+), 5 deletions(-)
 create mode 100644 accel/stubs/hvf-stub.c

diff --git a/MAINTAINERS b/MAINTAINERS
index c7083ab1d93..00ef33be0e2 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -525,6 +525,7 @@ R: Phil Dennis-Jordan <phil@philjordan.eu>
 W: https://wiki.qemu.org/Features/HVF
 S: Maintained
 F: accel/hvf/
+F: accel/stubs/hvf-stub.c
 F: include/system/hvf.h
 F: include/system/hvf_int.h
 
diff --git a/include/system/hvf.h b/include/system/hvf.h
index d50049e1a1a..7b45a2e1988 100644
--- a/include/system/hvf.h
+++ b/include/system/hvf.h
@@ -19,15 +19,19 @@
 #include "qom/object.h"
 
 #ifdef COMPILING_PER_TARGET
+# ifdef CONFIG_HVF
+#  define CONFIG_HVF_IS_POSSIBLE
+# endif /* !CONFIG_HVF */
+#else
+# define CONFIG_HVF_IS_POSSIBLE
+#endif /* COMPILING_PER_TARGET */
 
-#ifdef CONFIG_HVF
+#ifdef CONFIG_HVF_IS_POSSIBLE
 extern bool hvf_allowed;
 #define hvf_enabled() (hvf_allowed)
-#else /* !CONFIG_HVF */
+#else /* !CONFIG_HVF_IS_POSSIBLE */
 #define hvf_enabled() 0
-#endif /* !CONFIG_HVF */
-
-#endif /* COMPILING_PER_TARGET */
+#endif /* !CONFIG_HVF_IS_POSSIBLE */
 
 #define TYPE_HVF_ACCEL ACCEL_CLASS_NAME("hvf")
 
diff --git a/accel/stubs/hvf-stub.c b/accel/stubs/hvf-stub.c
new file mode 100644
index 00000000000..42eadc5ca92
--- /dev/null
+++ b/accel/stubs/hvf-stub.c
@@ -0,0 +1,12 @@
+/*
+ * HVF stubs for QEMU
+ *
+ *  Copyright (c) Linaro
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "qemu/osdep.h"
+#include "system/hvf.h"
+
+bool hvf_allowed;
diff --git a/accel/stubs/meson.build b/accel/stubs/meson.build
index 91a2d219258..8ca1a4529e2 100644
--- a/accel/stubs/meson.build
+++ b/accel/stubs/meson.build
@@ -2,5 +2,6 @@ system_stubs_ss = ss.source_set()
 system_stubs_ss.add(when: 'CONFIG_XEN', if_false: files('xen-stub.c'))
 system_stubs_ss.add(when: 'CONFIG_KVM', if_false: files('kvm-stub.c'))
 system_stubs_ss.add(when: 'CONFIG_TCG', if_false: files('tcg-stub.c'))
+system_stubs_ss.add(when: 'CONFIG_HVF', if_false: files('hvf-stub.c'))
 
 specific_ss.add_all(when: ['CONFIG_SYSTEM_ONLY'], if_true: system_stubs_ss)
-- 
2.47.1