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[Qemu-devel] [PATCH v7 1/2] libs/gnttab: introduce grant copy interface
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From: |
Paulina Szubarczyk |
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Subject: |
[Qemu-devel] [PATCH v7 1/2] libs/gnttab: introduce grant copy interface |
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Date: |
Wed, 14 Sep 2016 21:10:02 +0200 |
In a linux part an ioctl(gntdev, IOCTL_GNTDEV_GRANT_COPY, ..)
system call is invoked. In mini-os the operation is yet not
implemented. For the OSs that does not implement gnttab the
call of the grant copy operation causes abort.
Signed-off-by: Paulina Szubarczyk <address@hidden>
Reviewed-by: David Vrabel <address@hidden>
---
tools/include/xen-sys/Linux/gntdev.h | 21 ++++++++++
tools/libs/gnttab/Makefile | 2 +-
tools/libs/gnttab/gnttab_core.c | 6 +++
tools/libs/gnttab/gnttab_unimp.c | 6 +++
tools/libs/gnttab/include/xengnttab.h | 28 +++++++++++++
tools/libs/gnttab/libxengnttab.map | 5 +++
tools/libs/gnttab/linux.c | 77 +++++++++++++++++++++++++++++++++++
tools/libs/gnttab/minios.c | 6 +++
tools/libs/gnttab/private.h | 4 ++
9 files changed, 154 insertions(+), 1 deletion(-)
diff --git a/tools/include/xen-sys/Linux/gntdev.h
b/tools/include/xen-sys/Linux/gntdev.h
index caf6fb4..0ca07c9 100644
--- a/tools/include/xen-sys/Linux/gntdev.h
+++ b/tools/include/xen-sys/Linux/gntdev.h
@@ -147,4 +147,25 @@ struct ioctl_gntdev_unmap_notify {
/* Send an interrupt on the indicated event channel */
#define UNMAP_NOTIFY_SEND_EVENT 0x2
+struct ioctl_gntdev_grant_copy_segment {
+ union {
+ void *virt;
+ struct {
+ uint32_t ref;
+ uint16_t offset;
+ uint16_t domid;
+ } foreign;
+ } source, dest;
+ uint16_t len;
+ uint16_t flags;
+ int16_t status;
+};
+
+#define IOCTL_GNTDEV_GRANT_COPY \
+_IOC(_IOC_NONE, 'G', 8, sizeof(struct ioctl_gntdev_grant_copy))
+struct ioctl_gntdev_grant_copy {
+ unsigned int count;
+ struct ioctl_gntdev_grant_copy_segment *segments;
+};
+
#endif /* __LINUX_PUBLIC_GNTDEV_H__ */
diff --git a/tools/libs/gnttab/Makefile b/tools/libs/gnttab/Makefile
index af64542..95c2cd8 100644
--- a/tools/libs/gnttab/Makefile
+++ b/tools/libs/gnttab/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=libxengnttab.map
CFLAGS += -Werror -Wmissing-prototypes
diff --git a/tools/libs/gnttab/gnttab_core.c b/tools/libs/gnttab/gnttab_core.c
index 5d0474d..968c833 100644
--- a/tools/libs/gnttab/gnttab_core.c
+++ b/tools/libs/gnttab/gnttab_core.c
@@ -113,6 +113,12 @@ int xengnttab_unmap(xengnttab_handle *xgt, void
*start_address, uint32_t count)
return osdep_gnttab_unmap(xgt, start_address, count);
}
+int xengnttab_grant_copy(xengnttab_handle *xgt,
+ uint32_t count,
+ xengnttab_grant_copy_segment_t *segs)
+{
+ return osdep_gnttab_grant_copy(xgt, count, segs);
+}
/*
* Local variables:
* mode: C
diff --git a/tools/libs/gnttab/gnttab_unimp.c b/tools/libs/gnttab/gnttab_unimp.c
index b3a4a20..829eced 100644
--- a/tools/libs/gnttab/gnttab_unimp.c
+++ b/tools/libs/gnttab/gnttab_unimp.c
@@ -78,6 +78,12 @@ int xengnttab_unmap(xengnttab_handle *xgt, void
*start_address, uint32_t count)
abort();
}
+int xengnttab_copy_grant(xengnttab_handle *xgt,
+ uint32_t count,
+ xengnttab_copy_grant_segment_t *segs)
+{
+ abort();
+}
/*
* Local variables:
* mode: C
diff --git a/tools/libs/gnttab/include/xengnttab.h
b/tools/libs/gnttab/include/xengnttab.h
index 0431dcf..35be6c1 100644
--- a/tools/libs/gnttab/include/xengnttab.h
+++ b/tools/libs/gnttab/include/xengnttab.h
@@ -258,6 +258,34 @@ int xengnttab_unmap(xengnttab_handle *xgt, void
*start_address, uint32_t count);
int xengnttab_set_max_grants(xengnttab_handle *xgt,
uint32_t nr_grants);
+struct xengnttab_grant_copy_segment {
+ union xengnttab_copy_ptr {
+ void *virt;
+ struct {
+ uint32_t ref;
+ uint16_t offset;
+ uint16_t domid;
+ } foreign;
+ } source, dest;
+ uint16_t len;
+ uint16_t flags;
+ int16_t status;
+};
+
+typedef struct xengnttab_grant_copy_segment xengnttab_grant_copy_segment_t;
+
+/**
+ * Copy memory from or to grant references. The information of each operations
+ * are contained in 'xengnttab_grant_copy_segment_t'. The @flag value indicate
+ * the direction of an operation (GNTCOPY_source_gref\GNTCOPY_dest_gref).
+ *
+ * For each segment, @virt may cross a page boundary but @offset + @len
+ * must not exceed XEN_PAGE_SIZE.
+ */
+int xengnttab_grant_copy(xengnttab_handle *xgt,
+ uint32_t count,
+ xengnttab_grant_copy_segment_t *segs);
+
/*
* Grant Sharing Interface (allocating and granting pages to others)
*/
diff --git a/tools/libs/gnttab/libxengnttab.map
b/tools/libs/gnttab/libxengnttab.map
index dc737ac..f78da22 100644
--- a/tools/libs/gnttab/libxengnttab.map
+++ b/tools/libs/gnttab/libxengnttab.map
@@ -21,3 +21,8 @@ VERS_1.0 {
xengntshr_unshare;
local: *; /* Do not expose anything by default */
};
+
+VERS_1.1 {
+ global:
+ xengnttab_grant_copy;
+} VERS_1.0;
diff --git a/tools/libs/gnttab/linux.c b/tools/libs/gnttab/linux.c
index 7b0fba4..6bd9bd2 100644
--- a/tools/libs/gnttab/linux.c
+++ b/tools/libs/gnttab/linux.c
@@ -23,6 +23,7 @@
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
+#include <stddef.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
@@ -235,6 +236,82 @@ int osdep_gnttab_unmap(xengnttab_handle *xgt,
return 0;
}
+int osdep_gnttab_grant_copy(xengnttab_handle *xgt,
+ uint32_t count,
+ xengnttab_grant_copy_segment_t *segs)
+{
+ int rc;
+ int fd = xgt->fd;
+ struct ioctl_gntdev_grant_copy copy;
+
+ XENGNTTAB_BUILD_BUG_ON(sizeof(struct ioctl_gntdev_grant_copy_segment) !=
+ sizeof(xengnttab_grant_copy_segment_t));
+
+ XENGNTTAB_BUILD_BUG_ON(__alignof__(struct ioctl_gntdev_grant_copy_segment)
!=
+ __alignof__(xengnttab_grant_copy_segment_t));
+
+ XENGNTTAB_BUILD_BUG_ON(offsetof(struct ioctl_gntdev_grant_copy_segment,
+ source.virt) !=
+ offsetof(xengnttab_grant_copy_segment_t,
+ source.virt));
+ XENGNTTAB_BUILD_BUG_ON(offsetof(struct ioctl_gntdev_grant_copy_segment,
+ source.foreign) !=
+ offsetof(xengnttab_grant_copy_segment_t,
+ source.foreign));
+ XENGNTTAB_BUILD_BUG_ON(offsetof(struct ioctl_gntdev_grant_copy_segment,
+ source.foreign.ref) !=
+ offsetof(xengnttab_grant_copy_segment_t,
+ source.foreign));
+ XENGNTTAB_BUILD_BUG_ON(offsetof(struct ioctl_gntdev_grant_copy_segment,
+ source.foreign.offset) !=
+ offsetof(xengnttab_grant_copy_segment_t,
+ source.foreign.offset));
+ XENGNTTAB_BUILD_BUG_ON(offsetof(struct ioctl_gntdev_grant_copy_segment,
+ source.foreign.domid) !=
+ offsetof(xengnttab_grant_copy_segment_t,
+ source.foreign.domid));
+
+ XENGNTTAB_BUILD_BUG_ON(offsetof(struct ioctl_gntdev_grant_copy_segment,
+ dest.virt) !=
+ offsetof(xengnttab_grant_copy_segment_t,
+ dest.virt));
+ XENGNTTAB_BUILD_BUG_ON(offsetof(struct ioctl_gntdev_grant_copy_segment,
+ dest.foreign) !=
+ offsetof(xengnttab_grant_copy_segment_t,
+ dest.foreign));
+ XENGNTTAB_BUILD_BUG_ON(offsetof(struct ioctl_gntdev_grant_copy_segment,
+ dest.foreign.ref) !=
+ offsetof(xengnttab_grant_copy_segment_t,
+ dest.foreign));
+ XENGNTTAB_BUILD_BUG_ON(offsetof(struct ioctl_gntdev_grant_copy_segment,
+ dest.foreign.offset) !=
+ offsetof(xengnttab_grant_copy_segment_t,
+ dest.foreign.offset));
+ XENGNTTAB_BUILD_BUG_ON(offsetof(struct ioctl_gntdev_grant_copy_segment,
+ dest.foreign.domid) !=
+ offsetof(xengnttab_grant_copy_segment_t,
+ dest.foreign.domid));
+
+ XENGNTTAB_BUILD_BUG_ON(offsetof(struct ioctl_gntdev_grant_copy_segment,
+ len) !=
+ offsetof(xengnttab_grant_copy_segment_t, len));
+ XENGNTTAB_BUILD_BUG_ON(offsetof(struct ioctl_gntdev_grant_copy_segment,
+ flags) !=
+ offsetof(xengnttab_grant_copy_segment_t, flags));
+ XENGNTTAB_BUILD_BUG_ON(offsetof(struct ioctl_gntdev_grant_copy_segment,
+ status) !=
+ offsetof(xengnttab_grant_copy_segment_t, status));
+
+ copy.segments = (struct ioctl_gntdev_grant_copy_segment *)segs;
+ copy.count = count;
+
+ rc = ioctl(fd, IOCTL_GNTDEV_GRANT_COPY, ©);
+ if (rc)
+ GTERROR(xgt->logger, "ioctl GRANT COPY failed %d ", errno);
+
+ return rc;
+}
+
int osdep_gntshr_open(xengntshr_handle *xgs)
{
int fd = open(DEVXEN "gntalloc", O_RDWR);
diff --git a/tools/libs/gnttab/minios.c b/tools/libs/gnttab/minios.c
index 7e04174..0951bc9 100644
--- a/tools/libs/gnttab/minios.c
+++ b/tools/libs/gnttab/minios.c
@@ -106,6 +106,12 @@ int osdep_gnttab_set_max_grants(xengnttab_handle *xgt,
uint32_t count)
return ret;
}
+int osdep_gnttab_grant_copy(xengnttab_handle *xgt,
+ uint32_t count,
+ xengnttab_grant_copy_segment_t *segs)
+{
+ return -1;
+}
/*
* Local variables:
* mode: C
diff --git a/tools/libs/gnttab/private.h b/tools/libs/gnttab/private.h
index 2bdc0f2..f8d234a 100644
--- a/tools/libs/gnttab/private.h
+++ b/tools/libs/gnttab/private.h
@@ -30,6 +30,10 @@ void *osdep_gnttab_grant_map(xengnttab_handle *xgt,
int osdep_gnttab_unmap(xengnttab_handle *xgt,
void *start_address,
uint32_t count);
+int osdep_gnttab_grant_copy(xengnttab_handle *xgt,
+ uint32_t count,
+ xengnttab_grant_copy_segment_t *segs);
+
int osdep_gntshr_open(xengntshr_handle *xgs);
int osdep_gntshr_close(xengntshr_handle *xgs);
--
1.9.1