Niagara uses <sys/shm.h> which presently limits its compatibility to
linux hosts.  Change build to only build it on linux.

Add Kconfig file for skhynix directory, and make niagara depend on
CXL_MEM_DEVICE and LINUX.  Add an explicit flag for niagara.

Signed-off-by: Gregory Price <gregory.price@memverge.com>
---
 hw/cxl/Kconfig                    | 2 ++
 hw/cxl/vendor/Kconfig             | 1 +
 hw/cxl/vendor/skhynix/Kconfig     | 4 ++++
 hw/cxl/vendor/skhynix/meson.build | 2 +-
 4 files changed, 8 insertions(+), 1 deletion(-)
 create mode 100644 hw/cxl/vendor/Kconfig
 create mode 100644 hw/cxl/vendor/skhynix/Kconfig

diff --git a/hw/cxl/Kconfig b/hw/cxl/Kconfig
index dd6c54b54d..88022008c7 100644
--- a/hw/cxl/Kconfig
+++ b/hw/cxl/Kconfig
@@ -1,3 +1,5 @@
+source vendor/Kconfig
+
 config CXL
     bool
     default y if PCI_EXPRESS
diff --git a/hw/cxl/vendor/Kconfig b/hw/cxl/vendor/Kconfig
new file mode 100644
index 0000000000..aa23bb051b
--- /dev/null
+++ b/hw/cxl/vendor/Kconfig
@@ -0,0 +1 @@
+source skhynix/Kconfig
diff --git a/hw/cxl/vendor/skhynix/Kconfig b/hw/cxl/vendor/skhynix/Kconfig
new file mode 100644
index 0000000000..20942cffc2
--- /dev/null
+++ b/hw/cxl/vendor/skhynix/Kconfig
@@ -0,0 +1,4 @@
+config CXL_SKHYNIX_NIAGARA
+    bool
+    depends on CXL_MEM_DEVICE && LINUX
+    default y if CXL_VENDOR
diff --git a/hw/cxl/vendor/skhynix/meson.build b/hw/cxl/vendor/skhynix/meson.build
index 4e57db65f1..e3cb00e848 100644
--- a/hw/cxl/vendor/skhynix/meson.build
+++ b/hw/cxl/vendor/skhynix/meson.build
@@ -1 +1 @@
-system_ss.add(when: 'CONFIG_CXL_VENDOR', if_true: files('skhynix_niagara.c',))
+system_ss.add(when: 'CONFIG_CXL_SKHYNIX_NIAGARA', if_true: files('skhynix_niagara.c',))
-- 
2.39.1