# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1256290137 -3600
# Node ID 2d8e3fca36df6dc0ba3d14d753f64c66d4763a72
# Parent 4156fbc48a4508c26ca61a32ab767b050565bd2d
stubdom: mmap on /dev/mem support
This patch adds support for mmap on /dev/mem in a stubdom; it is
secure because it only works for memory areas that have been
explicitly allowed by the toolstack (xc_domain_iomem_permission).
Incidentally this is all that is needed to make MSI-X passthrough work
with stubdoms.
Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
xen-unstable changeset: 20354:37829fd7c1e3
xen-unstable date: Wed Oct 21 16:08:28 2009 +0100
minios: Optimize mmap(open("/dev/mem"))
Set map_frames_ex's stride parameter to 0 and increment to 1 to avoid
building an explicit list of mfns.
Signed-Off-By: Samuel Thibault <samuel.thibault@xxxxxxxxxxxx>
xen-unstable changeset: 20355:4a65bd76e09b
xen-unstable date: Fri Oct 23 09:59:45 2009 +0100
---
extras/mini-os/include/lib.h | 1 +
extras/mini-os/lib/sys.c | 9 ++++++++-
2 files changed, 9 insertions(+), 1 deletion(-)
diff -r 4156fbc48a45 -r 2d8e3fca36df extras/mini-os/include/lib.h
--- a/extras/mini-os/include/lib.h Fri Oct 23 10:25:10 2009 +0100
+++ b/extras/mini-os/include/lib.h Fri Oct 23 10:28:57 2009 +0100
@@ -145,6 +145,7 @@ enum fd_type {
FTYPE_BLK,
FTYPE_KBD,
FTYPE_FB,
+ FTYPE_MEM,
};
#define MAX_EVTCHN_PORTS 16
diff -r 4156fbc48a45 -r 2d8e3fca36df extras/mini-os/lib/sys.c
--- a/extras/mini-os/lib/sys.c Fri Oct 23 10:25:10 2009 +0100
+++ b/extras/mini-os/lib/sys.c Fri Oct 23 10:28:57 2009 +0100
@@ -174,6 +174,11 @@ int open(const char *pathname, int flags
if (!strncmp(pathname,LOG_PATH,strlen(LOG_PATH))) {
fd = alloc_fd(FTYPE_CONSOLE);
printk("open(%s) -> %d\n", pathname, fd);
+ return fd;
+ }
+ if (!strncmp(pathname, "/dev/mem", strlen("/dev/mem"))) {
+ fd = alloc_fd(FTYPE_MEM);
+ printk("open(/dev/mem) -> %d\n", fd);
return fd;
}
printk("open(%s, %x)", pathname, flags);
@@ -1198,13 +1203,15 @@ void *mmap(void *start, size_t length, i
ASSERT(prot == (PROT_READ|PROT_WRITE));
ASSERT((fd == -1 && (flags == (MAP_SHARED|MAP_ANON) || flags ==
(MAP_PRIVATE|MAP_ANON)))
|| (fd != -1 && flags == MAP_SHARED));
- ASSERT(offset == 0);
if (fd == -1)
return map_zero(n, 1);
else if (files[fd].type == FTYPE_XC) {
unsigned long zero = 0;
return map_frames_ex(&zero, n, 0, 0, 1, DOMID_SELF, 0, 0);
+ } else if (files[fd].type == FTYPE_MEM) {
+ unsigned long first_mfn = offset >> PAGE_SHIFT;
+ return map_frames_ex(&first_mfn, n, 0, 1, 1, DOMID_IO, 0,
_PAGE_PRESENT|_PAGE_RW);
} else ASSERT(0);
}
_______________________________________________
Xen-changelog mailing list
Xen-changelog@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-changelog
|
Home