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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v1 1/2] tools/libs/evtchn: Add support for restricting a handle
Implement support for restricting evtchn handles to a particular domain
on Linux by calling the IOCTL_EVTCHN_RESTRICT_DOMID ioctl (support added
in Linux v4.8).
Signed-off-by: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
---
tools/include/xen-sys/Linux/evtchn.h | 15 +++++++++++++++
tools/libs/evtchn/Makefile | 2 +-
tools/libs/evtchn/core.c | 5 +++++
tools/libs/evtchn/freebsd.c | 6 ++++++
tools/libs/evtchn/include/xenevtchn.h | 10 ++++++++++
tools/libs/evtchn/libxenevtchn.map | 4 ++++
tools/libs/evtchn/linux.c | 9 +++++++++
tools/libs/evtchn/minios.c | 6 ++++++
tools/libs/evtchn/netbsd.c | 6 ++++++
tools/libs/evtchn/private.h | 3 +++
tools/libs/evtchn/solaris.c | 6 ++++++
tools/libvchan/init.c | 1 +
tools/libvchan/libxenvchan.h | 1 +
13 files changed, 73 insertions(+), 1 deletion(-)
diff --git a/tools/include/xen-sys/Linux/evtchn.h
b/tools/include/xen-sys/Linux/evtchn.h
index 938d4da..08ee0b7 100644
--- a/tools/include/xen-sys/Linux/evtchn.h
+++ b/tools/include/xen-sys/Linux/evtchn.h
@@ -85,4 +85,19 @@ struct ioctl_evtchn_notify {
#define IOCTL_EVTCHN_RESET \
_IOC(_IOC_NONE, 'E', 5, 0)
+/*
+ * Restrict this file descriptor so that it can only be used to bind
+ * new interdomain events from one domain.
+ *
+ * Once a file descriptor has been restricted it cannot be
+ * de-restricted, and must be closed and re-opened. Event channels
+ * which were bound before restricting remain bound afterwards, and
+ * can be notified as usual.
+ */
+#define IOCTL_EVTCHN_RESTRICT_DOMID \
+ _IOC(_IOC_NONE, 'E', 6, sizeof(struct ioctl_evtchn_restrict_domid))
+struct ioctl_evtchn_restrict_domid {
+ domid_t domid;
+};
+
#endif /* __LINUX_PUBLIC_EVTCHN_H__ */
diff --git a/tools/libs/evtchn/Makefile b/tools/libs/evtchn/Makefile
index 5444ec7..bc98aed 100644
--- a/tools/libs/evtchn/Makefile
+++ b/tools/libs/evtchn/Makefile
@@ -2,7 +2,7 @@ XEN_ROOT = $(CURDIR)/../../..
include $(XEN_ROOT)/tools/Rules.mk
MAJOR = 1
-MINOR = 0
+MINOR = 1
SHLIB_LDFLAGS += -Wl,--version-script=libxenevtchn.map
CFLAGS += -Werror -Wmissing-prototypes
diff --git a/tools/libs/evtchn/core.c b/tools/libs/evtchn/core.c
index c31e08c..41621ff 100644
--- a/tools/libs/evtchn/core.c
+++ b/tools/libs/evtchn/core.c
@@ -61,6 +61,11 @@ int xenevtchn_close(xenevtchn_handle *xce)
return rc;
}
+int xenevtchn_restrict(xenevtchn_handle *xce, domid_t domid)
+{
+ return osdep_evtchn_restrict(xce, domid);
+}
+
/*
* Local variables:
* mode: C
diff --git a/tools/libs/evtchn/freebsd.c b/tools/libs/evtchn/freebsd.c
index 30eaa70..ba82f06 100644
--- a/tools/libs/evtchn/freebsd.c
+++ b/tools/libs/evtchn/freebsd.c
@@ -47,6 +47,12 @@ int osdep_evtchn_close(xenevtchn_handle *xce)
return close(xce->fd);
}
+int osdep_evtchn_restrict(xenevtchn_handle *xce, domid_t domid)
+{
+ errno = -EOPNOTSUPP;
+ return -1;
+}
+
int xenevtchn_fd(xenevtchn_handle *xce)
{
return xce->fd;
diff --git a/tools/libs/evtchn/include/xenevtchn.h
b/tools/libs/evtchn/include/xenevtchn.h
index 93b80cb..91821ee 100644
--- a/tools/libs/evtchn/include/xenevtchn.h
+++ b/tools/libs/evtchn/include/xenevtchn.h
@@ -151,6 +151,16 @@ xenevtchn_pending(xenevtchn_handle *xce);
*/
int xenevtchn_unmask(xenevtchn_handle *xce, evtchn_port_t port);
+/**
+ * This function restricts the use of this handle to the specified
+ * domain.
+ *
+ * @parm xce handle to the open evtchn interface
+ * @parm domid the domain id
+ * @return 0 on success, -1 on failure with errno set appropriately.
+ */
+int xenevtchn_restrict(xenevtchn_handle *xce, domid_t domid);
+
#endif
/*
diff --git a/tools/libs/evtchn/libxenevtchn.map
b/tools/libs/evtchn/libxenevtchn.map
index 625a1e2..33a38f9 100644
--- a/tools/libs/evtchn/libxenevtchn.map
+++ b/tools/libs/evtchn/libxenevtchn.map
@@ -17,3 +17,7 @@ VERS_1.0 {
xenevtchn_pending;
local: *; /* Do not expose anything by default */
};
+VERS_1.1 {
+ global:
+ xenevtchn_restrict;
+} VERS_1.0;
diff --git a/tools/libs/evtchn/linux.c b/tools/libs/evtchn/linux.c
index a581c5d..17e64ae 100644
--- a/tools/libs/evtchn/linux.c
+++ b/tools/libs/evtchn/linux.c
@@ -21,9 +21,11 @@
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
+#include <stdint.h>
#include <sys/ioctl.h>
+#include <xen/xen.h>
#include <xen/sys/evtchn.h>
#include "private.h"
@@ -49,6 +51,13 @@ int osdep_evtchn_close(xenevtchn_handle *xce)
return close(xce->fd);
}
+int osdep_evtchn_restrict(xenevtchn_handle *xce, domid_t domid)
+{
+ struct ioctl_evtchn_restrict_domid restrict_domid = { domid };
+
+ return ioctl(xce->fd, IOCTL_EVTCHN_RESTRICT_DOMID, &restrict_domid);
+}
+
int xenevtchn_fd(xenevtchn_handle *xce)
{
return xce->fd;
diff --git a/tools/libs/evtchn/minios.c b/tools/libs/evtchn/minios.c
index ccf37f0..414c21b 100644
--- a/tools/libs/evtchn/minios.c
+++ b/tools/libs/evtchn/minios.c
@@ -82,6 +82,12 @@ int osdep_evtchn_close(xenevtchn_handle *xce)
return close(xce->fd);
}
+int osdep_evtchn_restrict(xenevtchn_handle *xce, domid_t domid)
+{
+ errno = -EOPNOTSUPP;
+ return -1;
+}
+
void minios_evtchn_close_fd(int fd)
{
struct evtchn_port_info *port_info, *tmp;
diff --git a/tools/libs/evtchn/netbsd.c b/tools/libs/evtchn/netbsd.c
index 114c6e6..5ce3a35 100644
--- a/tools/libs/evtchn/netbsd.c
+++ b/tools/libs/evtchn/netbsd.c
@@ -47,6 +47,12 @@ int osdep_evtchn_close(xenevtchn_handle *xce)
return close(xce->fd);
}
+int osdep_evtchn_restrict(xenevtchn_handle *xce, domid_t domid)
+{
+ errno = -EOPNOTSUPP;
+ return -1;
+}
+
int xenevtchn_fd(xenevtchn_handle *xce)
{
return xce->fd;
diff --git a/tools/libs/evtchn/private.h b/tools/libs/evtchn/private.h
index fcd0e96..3d34862 100644
--- a/tools/libs/evtchn/private.h
+++ b/tools/libs/evtchn/private.h
@@ -4,6 +4,8 @@
#include <xentoollog.h>
#include <xenevtchn.h>
+#include <xen/xen.h>
+
struct xenevtchn_handle {
xentoollog_logger *logger, *logger_tofree;
int fd;
@@ -11,6 +13,7 @@ struct xenevtchn_handle {
int osdep_evtchn_open(xenevtchn_handle *xce);
int osdep_evtchn_close(xenevtchn_handle *xce);
+int osdep_evtchn_restrict(xenevtchn_handle *xce, domid_t domid);
#endif
diff --git a/tools/libs/evtchn/solaris.c b/tools/libs/evtchn/solaris.c
index dc249aa..f718989 100644
--- a/tools/libs/evtchn/solaris.c
+++ b/tools/libs/evtchn/solaris.c
@@ -50,6 +50,12 @@ int osdep_evtchn_close(xenevtchn_handle *xce)
return close(xce->fd);
}
+int osdep_evtchn_restrict(xenevtchn_handle *xce, domid_t domid)
+{
+ errno = -EOPNOTSUPP;
+ return -1;
+}
+
int xenevtchn_fd(xenevtchn_handle *xce)
{
return xce->fd;
diff --git a/tools/libvchan/init.c b/tools/libvchan/init.c
index e53f3a7..0b3759a 100644
--- a/tools/libvchan/init.c
+++ b/tools/libvchan/init.c
@@ -40,6 +40,7 @@
#include <fcntl.h>
#include <xenstore.h>
+#include <xen/xen.h>
#include <xen/sys/evtchn.h>
#include <xen/sys/gntalloc.h>
#include <xen/sys/gntdev.h>
diff --git a/tools/libvchan/libxenvchan.h b/tools/libvchan/libxenvchan.h
index 2adbdfe..d6010b1 100644
--- a/tools/libvchan/libxenvchan.h
+++ b/tools/libvchan/libxenvchan.h
@@ -43,6 +43,7 @@
*/
#include <xen/io/libxenvchan.h>
+#include <xen/xen.h>
#include <xen/sys/evtchn.h>
#include <xenevtchn.h>
#include <xengnttab.h>
--
2.9.5
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