diff options
| author | Ian Campbell <ian.campbell@citrix.com> | 2016-01-15 13:23:42 +0000 |
|---|---|---|
| committer | Stefano Stabellini <stefano.stabellini@eu.citrix.com> | 2016-01-26 17:19:38 +0000 |
| commit | 5eeb39c24b7d4da5d129bfdd9c4fd21cfb3d28d6 (patch) | |
| tree | adca833b87479df111ac0526c837782e859c8f2c /include/hw | |
| parent | e0cb42ae4bc4438ba4ec0760df2d830b8759b255 (diff) | |
xen: Use stable library interfaces when they are available.
In Xen 4.7 we are refactoring parts libxenctrl into a number of
separate libraries which will provide backward and forward API and ABI
compatiblity.
Specifically libxenevtchn, libxengnttab and libxenforeignmemory.
Previous patches have already laid the groundwork for using these by
switching the existing compatibility shims to reflect the intefaces to
these libraries.
So all which remains is to update configure to detect the libraries
and enable their use. Although they are notionally independent we take
an all or nothing approach to the three libraries since they were
added at the same time.
The only non-obvious bit is that we now open a proper xenforeignmemory
handle for xen_fmem instead of reusing the xen_xc handle.
Build tested with 4.0 .. 4.6 (inclusive) and the patches targetting
4.7 which adds these libraries.
This uses CONFIG_XEN_CTRL_INTERFACE_VERSION == 471 to cover the
introduction of these new interfaces.
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Diffstat (limited to 'include/hw')
| -rw-r--r-- | include/hw/xen/xen_common.h | 35 |
1 files changed, 33 insertions, 2 deletions
diff --git a/include/hw/xen/xen_common.h b/include/hw/xen/xen_common.h index 95275b34c4..19f1577e8f 100644 --- a/include/hw/xen/xen_common.h +++ b/include/hw/xen/xen_common.h @@ -6,6 +6,15 @@ #include <stddef.h> #include <inttypes.h> +/* + * If we have new enough libxenctrl then we do not want/need these compat + * interfaces, despite what the user supplied cflags might say. They + * must be undefined before including xenctrl.h + */ +#undef XC_WANT_COMPAT_EVTCHN_API +#undef XC_WANT_COMPAT_GNTTAB_API +#undef XC_WANT_COMPAT_MAP_FOREIGN_API + #include <xenctrl.h> #if CONFIG_XEN_CTRL_INTERFACE_VERSION < 420 # include <xs.h> @@ -148,8 +157,8 @@ static inline void xs_close(struct xs_handle *xsh) } -/* Xen 4.1 */ -#else +/* Xen 4.1 thru 4.6 */ +#elif CONFIG_XEN_CTRL_INTERFACE_VERSION < 471 typedef xc_interface *XenXC; typedef xc_interface *xenforeignmemory_handle; @@ -184,6 +193,28 @@ static inline XenXC xen_xc_interface_open(void *logger, void *dombuild_logger, /* See below for xenforeignmemory_* APIs */ +/* FIXME There is no way to have the xen fd */ +static inline int xc_fd(xc_interface *xen_xc) +{ + return -1; +} +#else /* CONFIG_XEN_CTRL_INTERFACE_VERSION >= 471 */ + +typedef xc_interface *XenXC; + +# define XC_INTERFACE_FMT "%p" +# define XC_HANDLER_INITIAL_VALUE NULL + +#include <xenevtchn.h> +#include <xengnttab.h> +#include <xenforeignmemory.h> + +static inline XenXC xen_xc_interface_open(void *logger, void *dombuild_logger, + unsigned int open_flags) +{ + return xc_interface_open(logger, dombuild_logger, open_flags); +} + /* FIXME There is now way to have the xen fd */ static inline int xc_fd(xc_interface *xen_xc) { |