[Minios-devel] [UNIKRAFT PATCH] plat/xen: Grant table support as menu option

[Simon Kuenzer <simon.kuenzer@xxxxxxxxx>]

Introduces a menu option to enable or disable grant table support.
The reason is that our grant table implementation depends on
libuklock, libuksched, and libukalloc. A minimal requires these
libraries selected, too. This may be an obstacle when running driver
implementation in higher-level languages. Additionally, some of
these libraries are currenlty not supported on Arm. It is
wiser to give an option for disabling grant table support.

Signed-off-by: Simon Kuenzer <simon.kuenzer@xxxxxxxxx>
---
 plat/xen/Config.uk               | 20 +++++++++++++++-----
 plat/xen/Makefile.uk             |  2 +-
 plat/xen/include/common/gnttab.h |  6 ++++++
 plat/xen/memory.c                |  2 ++
 4 files changed, 24 insertions(+), 6 deletions(-)

diff --git a/plat/xen/Config.uk b/plat/xen/Config.uk
index d0143e95..9cfe90a2 100644
--- a/plat/xen/Config.uk
+++ b/plat/xen/Config.uk
@@ -3,8 +3,6 @@ menuconfig PLAT_XEN
        default n
        depends on (ARCH_X86_32 || ARCH_X86_64 || ARCH_ARM_32)
        select LIBUKDEBUG
-       select LIBUKLOCK
-       select LIBUKLOCK_SEMAPHORE
        select LIBNOLIBC if !HAVE_LIBC
        select LIBFDT if ARCH_ARM_32
        select XEN_DBGEMERGENCY if ARCH_ARM_32
@@ -21,11 +19,23 @@ if (PLAT_XEN)
                option is enabled the hypervisor console is used
                for kernel messages only.
 
+config XEN_GNTTAB
+       bool "Grant table support"
+       default y
+       depends on (ARCH_X86_64)
+       select LIBUKALLOC
+       select LIBUKLOCK
+       select LIBUKLOCK_SEMAPHORE
+       select LIBUKSCHED
+       help
+               Support grant table operations
+
 menuconfig XEN_XENBUS
-       bool "Xenbus Driver"
+       bool "Xenbus/XenStore driver"
        default n
-       depends on (ARCH_X86_64)
+       depends on XEN_GNTTAB
        select LIBUKBUS
        help
-               Register a Xenbus driver as uk_bus
+               Registers Xenbus as bus driver to libukbus and provides a
+               XenStore communication API for Xen drivers
 endif
diff --git a/plat/xen/Makefile.uk b/plat/xen/Makefile.uk
index 38b510ad..e6d5be0e 100644
--- a/plat/xen/Makefile.uk
+++ b/plat/xen/Makefile.uk
@@ -73,7 +73,7 @@ LIBXENPLAT_SRCS-y              += $(LIBXENPLAT_BASE)/lcpu.c
 LIBXENPLAT_SRCS-y              += $(LIBXENPLAT_BASE)/console.c
 LIBXENPLAT_SRCS-y              += $(LIBXENPLAT_BASE)/shutdown.c
 LIBXENPLAT_SRCS-y              += $(LIBXENPLAT_BASE)/events.c
-LIBXENPLAT_SRCS-y              += $(LIBXENPLAT_BASE)/gnttab.c
+LIBXENPLAT_SRCS-$(CONFIG_XEN_GNTTAB) += $(LIBXENPLAT_BASE)/gnttab.c
 
 ifeq ($(CONFIG_XEN_XENBUS),y)
 LIBXENBUS_EXPORTS               = $(LIBXENPLAT_BASE)/xenbus/exportsyms.uk
diff --git a/plat/xen/include/common/gnttab.h b/plat/xen/include/common/gnttab.h
index d4bb4172..f5cde5c5 100644
--- a/plat/xen/include/common/gnttab.h
+++ b/plat/xen/include/common/gnttab.h
@@ -26,6 +26,10 @@
 #ifndef __GNTTAB_H__
 #define __GNTTAB_H__
 
+#include <uk/config.h>
+
+#ifdef CONFIG_XEN_GNTTAB
+
 #include <uk/alloc.h>
 #include <xen/grant_table.h>
 
@@ -45,4 +49,6 @@ const char *gnttabop_error(__s16 status);
 
 grant_entry_v1_t *gnttab_arch_init(int nr_grant_frames);
 
+#endif /* CONFIG_XEN_GNTTAB */
+
 #endif /* !__GNTTAB_H__ */
diff --git a/plat/xen/memory.c b/plat/xen/memory.c
index f84dca71..1f55887e 100644
--- a/plat/xen/memory.c
+++ b/plat/xen/memory.c
@@ -123,6 +123,8 @@ int ukplat_memregion_get(int i, struct 
ukplat_memregion_desc *m)
 
 int _ukplat_mem_mappings_init(void)
 {
+#ifdef CONFIG_XEN_GNTTAB
        gnttab_init();
+#endif
        return 0;
 }
-- 
2.11.0


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