Pass CONFIG_FUZZ via host_kconfig, and use it to select the
sparse-mem device.

Cc: Alexander Oleinik <alxndr@bu.edu>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Alexander Bulekov <alxndr@bu.edu>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Alexander Bulekov <alxndr@bu.edu>
Message-Id: <20211007130829.632254-1-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 Kconfig.host       | 4 ++++
 hw/mem/Kconfig     | 3 +++
 hw/mem/meson.build | 2 +-
 meson.build        | 1 +
 4 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/Kconfig.host b/Kconfig.host
index 24255ef441..60b9c07b5e 100644
--- a/Kconfig.host
+++ b/Kconfig.host
@@ -41,3 +41,7 @@ config PVRDMA
 config MULTIPROCESS_ALLOWED
     bool
     imply MULTIPROCESS
+
+config FUZZ
+    bool
+    select SPARSE_MEM
diff --git a/hw/mem/Kconfig b/hw/mem/Kconfig
index 8b19fdc49f..03dbb3c7df 100644
--- a/hw/mem/Kconfig
+++ b/hw/mem/Kconfig
@@ -8,3 +8,6 @@ config MEM_DEVICE
 config NVDIMM
     bool
     select MEM_DEVICE
+
+config SPARSE_MEM
+    bool
diff --git a/hw/mem/meson.build b/hw/mem/meson.build
index 3c8fdef9f9..82f86d117e 100644
--- a/hw/mem/meson.build
+++ b/hw/mem/meson.build
@@ -6,4 +6,4 @@ mem_ss.add(when: 'CONFIG_NVDIMM', if_true: files('nvdimm.c'))
 
 softmmu_ss.add_all(when: 'CONFIG_MEM_DEVICE', if_true: mem_ss)
 
-softmmu_ss.add(when: 'CONFIG_FUZZ', if_true: files('sparse-mem.c'))
+softmmu_ss.add(when: 'CONFIG_SPARSE_MEM', if_true: files('sparse-mem.c'))
diff --git a/meson.build b/meson.build
index c0c5b7b9da..5c8a919cfb 100644
--- a/meson.build
+++ b/meson.build
@@ -1599,6 +1599,7 @@ endif
 
 have_ivshmem = config_host_data.get('CONFIG_EVENTFD')
 host_kconfig = \
+  ('CONFIG_FUZZ' in config_host ? ['CONFIG_FUZZ=y'] : []) + \
   ('CONFIG_TPM' in config_host ? ['CONFIG_TPM=y'] : []) + \
   ('CONFIG_SPICE' in config_host ? ['CONFIG_SPICE=y'] : []) + \
   (have_ivshmem ? ['CONFIG_IVSHMEM=y'] : []) + \
-- 
2.31.1