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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 1 of 2] Write Xen ELF notes into xenstore on domain build
# HG changeset patch
# User Brendan Cully <brendan@xxxxxxxxx>
# Date 1172453755 28800
# Node ID ea6d1ab3d87507e414bd226fcbf768bf47cffe48
# Parent 2c3a13993b0d1c6b374e96c5a365fe615dca2f72
Write Xen ELF notes into xenstore on domain build.
This information is plumbed through save and restore in a subsequent patch.
Signed-off-by: Brendan Cully <brendan@xxxxxxxxx>
diff -r 2c3a13993b0d -r ea6d1ab3d875 tools/libxc/xc_dom_compat_linux.c
--- a/tools/libxc/xc_dom_compat_linux.c Fri Feb 23 14:44:07 2007 +0000
+++ b/tools/libxc/xc_dom_compat_linux.c Sun Feb 25 17:35:55 2007 -0800
@@ -122,3 +122,30 @@ int xc_linux_build(int xc_handle, uint32
xc_dom_release(dom);
return rc;
}
+
+int xc_dom_linux_build(int xc_handle,
+ struct xc_dom_image *dom,
+ uint32_t domid,
+ unsigned int mem_mb,
+ const char *image_name,
+ const char *initrd_name,
+ unsigned long flags,
+ unsigned int store_evtchn,
+ unsigned long *store_mfn,
+ unsigned int console_evtchn, unsigned long *console_mfn)
+{
+ int rc;
+
+ if (0 != (rc = xc_dom_kernel_file(dom, image_name)))
+ return rc;
+ if (initrd_name && strlen(initrd_name))
+ if (0 != (rc = xc_dom_ramdisk_file(dom, initrd_name)))
+ return rc;
+
+ rc = xc_linux_build_internal(dom, xc_handle, domid,
+ mem_mb, flags,
+ store_evtchn, store_mfn,
+ console_evtchn, console_mfn);
+
+ return rc;
+}
diff -r 2c3a13993b0d -r ea6d1ab3d875 tools/libxc/xenguest.h
--- a/tools/libxc/xenguest.h Fri Feb 23 14:44:07 2007 +0000
+++ b/tools/libxc/xenguest.h Sun Feb 25 17:35:55 2007 -0800
@@ -91,6 +91,20 @@ int xc_linux_build(int xc_handle,
unsigned int console_evtchn,
unsigned long *console_mfn);
+/** The same interface, but the dom structure is managed by the caller */
+struct xc_dom_image;
+int xc_dom_linux_build(int xc_handle,
+ struct xc_dom_image *dom,
+ uint32_t domid,
+ unsigned int mem_mb,
+ const char *image_name,
+ const char *ramdisk_name,
+ unsigned long flags,
+ unsigned int store_evtchn,
+ unsigned long *store_mfn,
+ unsigned int console_evtchn,
+ unsigned long *console_mfn);
+
/**
* This function will create a domain for a paravirtualized Linux
* using buffers for kernel and initrd
diff -r 2c3a13993b0d -r ea6d1ab3d875 tools/python/xen/lowlevel/xc/xc.c
--- a/tools/python/xen/lowlevel/xc/xc.c Fri Feb 23 14:44:07 2007 +0000
+++ b/tools/python/xen/lowlevel/xc/xc.c Sun Feb 25 17:35:55 2007 -0800
@@ -18,6 +18,8 @@
#include <arpa/inet.h>
#include "xenctrl.h"
+#include <xen/elfnote.h>
+#include "xc_dom.h"
#include <xen/hvm/hvm_info_table.h>
#include <xen/hvm/params.h>
@@ -371,13 +373,17 @@ static PyObject *pyxc_linux_build(XcObje
PyObject *args,
PyObject *kwds)
{
- uint32_t dom;
+ uint32_t domid;
+ struct xc_dom_image *dom;
char *image, *ramdisk = NULL, *cmdline = "", *features = NULL;
int flags = 0;
int store_evtchn, console_evtchn;
unsigned int mem_mb;
unsigned long store_mfn = 0;
unsigned long console_mfn = 0;
+ PyObject* elfnote_dict;
+ PyObject* elfnote = NULL;
+ int i;
static char *kwd_list[] = { "domid", "store_evtchn", "memsize",
"console_evtchn", "image",
@@ -386,22 +392,52 @@ static PyObject *pyxc_linux_build(XcObje
"features", NULL };
if ( !PyArg_ParseTupleAndKeywords(args, kwds, "iiiis|ssis", kwd_list,
- &dom, &store_evtchn, &mem_mb,
+ &domid, &store_evtchn, &mem_mb,
&console_evtchn, &image,
/* optional */
&ramdisk, &cmdline, &flags,
&features) )
return NULL;
- if ( xc_linux_build(self->xc_handle, dom, mem_mb, image,
- ramdisk, cmdline, features, flags,
- store_evtchn, &store_mfn,
- console_evtchn, &console_mfn) != 0 ) {
- return pyxc_error_to_exception();
+ xc_dom_loginit();
+ if (!(dom = xc_dom_allocate(cmdline, features)))
+ return pyxc_error_to_exception();
+
+ if ( xc_dom_linux_build(self->xc_handle, dom, domid, mem_mb, image,
+ ramdisk, flags, store_evtchn, &store_mfn,
+ console_evtchn, &console_mfn) != 0 ) {
+ goto out;
}
- return Py_BuildValue("{s:i,s:i}",
+
+ if (!(elfnote_dict = PyDict_New()))
+ goto out;
+ for (i = 0; i < XEN_ELFNOTE_MAX; i++) {
+ switch (dom->parms.elf_notes[i].type) {
+ case XEN_ENT_NONE:
+ continue;
+ case XEN_ENT_LONG:
+ elfnote = Py_BuildValue("k", dom->parms.elf_notes[i].data.num);
+ break;
+ case XEN_ENT_STR:
+ elfnote = Py_BuildValue("s", dom->parms.elf_notes[i].data.str);
+ break;
+ }
+ PyDict_SetItemString(elfnote_dict,
+ dom->parms.elf_notes[i].name,
+ elfnote);
+ Py_DECREF(elfnote);
+ }
+
+ xc_dom_release(dom);
+
+ return Py_BuildValue("{s:i,s:i,s:N}",
"store_mfn", store_mfn,
- "console_mfn", console_mfn);
+ "console_mfn", console_mfn,
+ "notes", elfnote_dict);
+
+ out:
+ xc_dom_release(dom);
+ return pyxc_error_to_exception();
}
static PyObject *pyxc_hvm_build(XcObject *self,
diff -r 2c3a13993b0d -r ea6d1ab3d875 tools/python/xen/xend/XendDomainInfo.py
--- a/tools/python/xen/xend/XendDomainInfo.py Fri Feb 23 14:44:07 2007 +0000
+++ b/tools/python/xen/xend/XendDomainInfo.py Sun Feb 25 17:35:55 2007 -0800
@@ -302,6 +302,8 @@ class XendDomainInfo:
@type store_mfn: int
@ivar console_mfn: xenconsoled mfn
@type console_mfn: int
+ @ivar notes: OS image notes
+ @type notes: dictionary
@ivar vmWatch: reference to a watch on the xenstored vmpath
@type vmWatch: xen.xend.xenstore.xswatch
@ivar shutdownWatch: reference to watch on the xenstored domain shutdown
@@ -354,6 +356,7 @@ class XendDomainInfo:
self.store_mfn = None
self.console_port = None
self.console_mfn = None
+ self.notes = {}
self.vmWatch = None
self.shutdownWatch = None
@@ -776,12 +779,28 @@ class XendDomainInfo:
def f(n, v):
if v is not None:
- to_store[n] = str(v)
+ if type(v) == bool:
+ to_store[n] = v and "1" or "0"
+ else:
+ to_store[n] = str(v)
f('console/port', self.console_port)
f('console/ring-ref', self.console_mfn)
f('store/port', self.store_port)
f('store/ring-ref', self.store_mfn)
+
+ # elfnotes
+ for n, v in self.notes.iteritems():
+ n = n.lower().replace('_', '-')
+ if n == 'features':
+ for v in v.split('|'):
+ v = v.replace('_', '-')
+ if v.startswith('!'):
+ f('image/%s/%s' % (n, v[1:]), False)
+ else:
+ f('image/%s/%s' % (n, v), True)
+ else:
+ f('image/%s' % n, v)
to_store.update(self._vcpuDomDetails())
@@ -1462,6 +1481,8 @@ class XendDomainInfo:
self.store_mfn = channel_details['store_mfn']
if 'console_mfn' in channel_details:
self.console_mfn = channel_details['console_mfn']
+ if 'notes' in channel_details:
+ self.notes = channel_details['notes']
self._introduceDomain()
diff -r 2c3a13993b0d -r ea6d1ab3d875 xen/arch/x86/domain_build.c
--- a/xen/arch/x86/domain_build.c Fri Feb 23 14:44:07 2007 +0000
+++ b/xen/arch/x86/domain_build.c Sun Feb 25 17:35:55 2007 -0800
@@ -28,6 +28,7 @@
#include <asm/paging.h>
#include <public/version.h>
+#include <public/elfnote.h>
#include <public/libelf.h>
extern unsigned long initial_images_nrpages(void);
diff -r 2c3a13993b0d -r ea6d1ab3d875 xen/common/libelf/libelf-dominfo.c
--- a/xen/common/libelf/libelf-dominfo.c Fri Feb 23 14:44:07 2007 +0000
+++ b/xen/common/libelf/libelf-dominfo.c Sun Feb 25 17:35:55 2007 -0800
@@ -119,13 +119,18 @@ int elf_xen_parse_note(struct elf_binary
str = elf_note_desc(elf, note);
elf_msg(elf, "%s: %s = \"%s\"\n", __FUNCTION__,
note_desc[type].name, str);
+ parms->elf_notes[type].type = XEN_ENT_STR;
+ parms->elf_notes[type].data.str = str;
}
else
{
val = elf_note_numeric(elf, note);
elf_msg(elf, "%s: %s = 0x%" PRIx64 "\n", __FUNCTION__,
note_desc[type].name, val);
- }
+ parms->elf_notes[type].type = XEN_ENT_LONG;
+ parms->elf_notes[type].data.num = val;
+ }
+ parms->elf_notes[type].name = note_desc[type].name;
switch ( type )
{
diff -r 2c3a13993b0d -r ea6d1ab3d875 xen/include/public/elfnote.h
--- a/xen/include/public/elfnote.h Fri Feb 23 14:44:07 2007 +0000
+++ b/xen/include/public/elfnote.h Sun Feb 25 17:35:55 2007 -0800
@@ -157,6 +157,11 @@
#define XEN_ELFNOTE_L1_MFN_VALID 13
/*
+ * The number of the highest elfnote defined.
+ */
+#define XEN_ELFNOTE_MAX XEN_ELFNOTE_L1_MFN_VALID
+
+/*
* System information exported through crash notes.
*
* The kexec / kdump code will create one XEN_ELFNOTE_CRASH_INFO
diff -r 2c3a13993b0d -r ea6d1ab3d875 xen/include/public/libelf.h
--- a/xen/include/public/libelf.h Fri Feb 23 14:44:07 2007 +0000
+++ b/xen/include/public/libelf.h Sun Feb 25 17:35:55 2007 -0800
@@ -174,12 +174,28 @@ int elf_reloc(struct elf_binary *elf);
#define UNSET_ADDR ((uint64_t)-1)
+enum xen_elfnote_type {
+ XEN_ENT_NONE = 0,
+ XEN_ENT_LONG = 1,
+ XEN_ENT_STR = 2
+};
+
+struct xen_elfnote {
+ enum xen_elfnote_type type;
+ const char *name;
+ union {
+ const char *str;
+ uint64_t num;
+ } data;
+};
+
struct elf_dom_parms {
/* raw */
const char *guest_info;
const void *elf_note_start;
const void *elf_note_end;
-
+ struct xen_elfnote elf_notes[XEN_ELFNOTE_MAX + 1];
+
/* parsed */
char guest_os[16];
char guest_ver[16];
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