* x86: Support loading Linux bzImage v2.08 and up.
@ 2008-03-13 18:40 Ian Campbell
0 siblings, 0 replies; 4+ messages in thread
From: Ian Campbell @ 2008-03-13 18:40 UTC (permalink / raw)
To: xen-devel
[-- Attachment #1: Type: text/plain, Size: 406 bytes --]
The latest -mm kernel (2.6.25-rc3-mm1) contains v2.08 of the Linux
bzImage format which embeds an ELF file in place of the raw payload
allowing it to be extracted and used by the Xen domain builder.
It is expected that this functionality will be put forward for 2.6.26.
Signed-off-by : Ian Campbell <ijc@hellion.org.uk>
--
Ian Campbell
BOFH excuse #205:
Quantum dynamics are affecting the transistors
[-- Attachment #2: x86-bzImage-domain-builder.patch --]
[-- Type: text/x-patch, Size: 6254 bytes --]
# HG changeset patch
# User ijc@hellion.org.uk
# Date 1204802215 0
# Node ID 6777c62fc986aa86f7c9195d7e4d31e6c9ec7315
# Parent 59b8768d0d0d3bf2125c33adafbd1256e75e2755
x86: Support loading Linux bzImage v2.08 and up.
The latest -mm kernel (2.6.25-rc3-mm1) contains v2.08 of the Linux bzImage
format which embeds an ELF file in place of the raw payload allowing it to be
extracted and used by the Xen domain builder.
It is expected that this functionality will be put forward for 2.6.26.
Signed-off-by : Ian Campbell <ijc@hellion.org.uk>
diff -r 59b8768d0d0d -r 6777c62fc986 tools/libxc/Makefile
--- a/tools/libxc/Makefile Wed Mar 05 11:18:25 2008 +0000
+++ b/tools/libxc/Makefile Thu Mar 06 11:16:55 2008 +0000
@@ -46,10 +46,11 @@ GUEST_SRCS-y += libelf-dominfo.c libelf-
GUEST_SRCS-y += libelf-dominfo.c libelf-relocate.c
# new domain builder
-GUEST_SRCS-y += xc_dom_core.c xc_dom_boot.c
-GUEST_SRCS-y += xc_dom_elfloader.c
-GUEST_SRCS-y += xc_dom_binloader.c
-GUEST_SRCS-y += xc_dom_compat_linux.c
+GUEST_SRCS-y += xc_dom_core.c xc_dom_boot.c
+GUEST_SRCS-y += xc_dom_elfloader.c
+GUEST_SRCS-$(CONFIG_X86) += xc_dom_bzimageloader.c
+GUEST_SRCS-y += xc_dom_binloader.c
+GUEST_SRCS-y += xc_dom_compat_linux.c
GUEST_SRCS-$(CONFIG_X86) += xc_dom_x86.c
GUEST_SRCS-$(CONFIG_IA64) += xc_dom_ia64.c
diff -r 59b8768d0d0d -r 6777c62fc986 tools/libxc/xc_dom_bzimageloader.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/libxc/xc_dom_bzimageloader.c Thu Mar 06 11:16:55 2008 +0000
@@ -0,0 +1,159 @@
+/*
+ * Xen domain builder -- bzImage bits
+ *
+ * Parse and load bzImage kernel images.
+ *
+ * This relies on version 2.08 of the boot protocol, which contains an
+ * ELF file embedded in the bzImage. The loader extracts this ELF
+ * image and passes it off to the standard ELF loader.
+ *
+ * This code is licenced under the GPL.
+ * written 2006 by Gerd Hoffmann <kraxel@suse.de>.
+ * written 2007 by Jeremy Fitzhardinge <jeremy@xensource.com>
+ * written 2008 by Ian Campbell <ijc@hellion.org.uk>
+ *
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <inttypes.h>
+
+#include "xg_private.h"
+#include "xc_dom.h"
+
+struct setup_header {
+ uint8_t _pad0[0x1f1]; /* skip uninteresting stuff */
+ uint8_t setup_sects;
+ uint16_t root_flags;
+ uint32_t syssize;
+ uint16_t ram_size;
+ uint16_t vid_mode;
+ uint16_t root_dev;
+ uint16_t boot_flag;
+ uint16_t jump;
+ uint32_t header;
+#define HDR_MAGIC "HdrS"
+#define HDR_MAGIC_SZ 4
+ uint16_t version;
+#define VERSION(h,l) (((h)<<8) | (l))
+ uint32_t realmode_swtch;
+ uint16_t start_sys;
+ uint16_t kernel_version;
+ uint8_t type_of_loader;
+ uint8_t loadflags;
+ uint16_t setup_move_size;
+ uint32_t code32_start;
+ uint32_t ramdisk_image;
+ uint32_t ramdisk_size;
+ uint32_t bootsect_kludge;
+ uint16_t heap_end_ptr;
+ uint16_t _pad1;
+ uint32_t cmd_line_ptr;
+ uint32_t initrd_addr_max;
+ uint32_t kernel_alignment;
+ uint8_t relocatable_kernel;
+ uint8_t _pad2[3];
+ uint32_t cmdline_size;
+ uint32_t hardware_subarch;
+ uint64_t hardware_subarch_data;
+ uint32_t payload_offset;
+ uint32_t payload_length;
+} __attribute__((packed));
+
+extern struct xc_dom_loader elf_loader;
+
+static unsigned int payload_offset(struct setup_header *hdr)
+{
+ unsigned int off;
+
+ off = (hdr->setup_sects + 1) * 512;
+ off += hdr->payload_offset;
+ return off;
+}
+
+static int check_bzimage_kernel(struct xc_dom_image *dom, int verbose)
+{
+ struct setup_header *hdr;
+
+ if ( dom->kernel_blob == NULL )
+ {
+ if ( verbose )
+ xc_dom_panic(XC_INTERNAL_ERROR, "%s: no kernel image loaded\n",
+ __FUNCTION__);
+ return -EINVAL;
+ }
+ if ( dom->kernel_size < sizeof(struct setup_header) )
+ {
+ if ( verbose )
+ xc_dom_panic(XC_INTERNAL_ERROR, "%s: kernel image too small\n",
+ __FUNCTION__);
+ return -EINVAL;
+ }
+
+ hdr = dom->kernel_blob;
+
+ if ( memcmp(&hdr->header, HDR_MAGIC, HDR_MAGIC_SZ) != 0 )
+ {
+ if ( verbose )
+ xc_dom_panic(XC_INVALID_KERNEL, "%s: kernel is not a bzImage\n",
+ __FUNCTION__);
+ return -EINVAL;
+ }
+
+ if ( hdr->version < VERSION(2,8) )
+ {
+ if ( verbose )
+ xc_dom_panic(XC_INVALID_KERNEL, "%s: boot protocol too old (%04x)\n",
+ __FUNCTION__, hdr->version);
+ return -EINVAL;
+ }
+
+ dom->kernel_blob = dom->kernel_blob + payload_offset(hdr);
+ dom->kernel_size = hdr->payload_length;
+
+ if ( xc_dom_try_gunzip(dom, &dom->kernel_blob, &dom->kernel_size) == -1 )
+ {
+ if ( verbose )
+ xc_dom_panic(XC_INVALID_KERNEL, "%s: unable to decompress kernel\n",
+ __FUNCTION__);
+ return -EINVAL;
+ }
+
+ return elf_loader.probe(dom);
+}
+
+static int xc_dom_probe_bzimage_kernel(struct xc_dom_image *dom)
+{
+ return check_bzimage_kernel(dom, 0);
+}
+
+static int xc_dom_parse_bzimage_kernel(struct xc_dom_image *dom)
+{
+ return elf_loader.parser(dom);
+}
+
+static int xc_dom_load_bzimage_kernel(struct xc_dom_image *dom)
+{
+ return elf_loader.loader(dom);
+}
+
+static struct xc_dom_loader bzimage_loader = {
+ .name = "Linux bzImage",
+ .probe = xc_dom_probe_bzimage_kernel,
+ .parser = xc_dom_parse_bzimage_kernel,
+ .loader = xc_dom_load_bzimage_kernel,
+};
+
+static void __init register_loader(void)
+{
+ xc_dom_register_loader(&bzimage_loader);
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-set-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff -r 59b8768d0d0d -r 6777c62fc986 tools/libxc/xc_dom_elfloader.c
--- a/tools/libxc/xc_dom_elfloader.c Wed Mar 05 11:18:25 2008 +0000
+++ b/tools/libxc/xc_dom_elfloader.c Thu Mar 06 11:16:55 2008 +0000
@@ -281,7 +281,7 @@ static int xc_dom_load_elf_kernel(struct
/* ------------------------------------------------------------------------ */
-static struct xc_dom_loader elf_loader = {
+struct xc_dom_loader elf_loader = {
.name = "ELF-generic",
.probe = xc_dom_probe_elf_kernel,
.parser = xc_dom_parse_elf_kernel,
[-- Attachment #3: Type: text/plain, Size: 138 bytes --]
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel
^ permalink raw reply [flat|nested] 4+ messages in thread
* x86: Support loading Linux bzImage v2.08 and up.
@ 2008-03-31 19:42 Ian Campbell
2008-04-03 10:01 ` Mark McLoughlin
0 siblings, 1 reply; 4+ messages in thread
From: Ian Campbell @ 2008-03-31 19:42 UTC (permalink / raw)
To: Keir Fraser; +Cc: xen-devel
[-- Attachment #1: Type: text/plain, Size: 406 bytes --]
The latest -mm kernel (2.6.25-rc3-mm1) contains v2.08 of the Linux
bzImage format which embeds an ELF file in place of the raw payload
allowing it to be extracted and used by the Xen domain builder.
It is expected that this functionality will be put forward for 2.6.26.
Signed-off-by : Ian Campbell <ijc@hellion.org.uk>
--
Ian Campbell
BOFH excuse #205:
Quantum dynamics are affecting the transistors
[-- Attachment #2: x86-bzImage-domain-builder.patch --]
[-- Type: text/x-patch, Size: 6254 bytes --]
# HG changeset patch
# User ijc@hellion.org.uk
# Date 1204802215 0
# Node ID 6777c62fc986aa86f7c9195d7e4d31e6c9ec7315
# Parent 59b8768d0d0d3bf2125c33adafbd1256e75e2755
x86: Support loading Linux bzImage v2.08 and up.
The latest -mm kernel (2.6.25-rc3-mm1) contains v2.08 of the Linux bzImage
format which embeds an ELF file in place of the raw payload allowing it to be
extracted and used by the Xen domain builder.
It is expected that this functionality will be put forward for 2.6.26.
Signed-off-by : Ian Campbell <ijc@hellion.org.uk>
diff -r 59b8768d0d0d -r 6777c62fc986 tools/libxc/Makefile
--- a/tools/libxc/Makefile Wed Mar 05 11:18:25 2008 +0000
+++ b/tools/libxc/Makefile Thu Mar 06 11:16:55 2008 +0000
@@ -46,10 +46,11 @@ GUEST_SRCS-y += libelf-dominfo.c libelf-
GUEST_SRCS-y += libelf-dominfo.c libelf-relocate.c
# new domain builder
-GUEST_SRCS-y += xc_dom_core.c xc_dom_boot.c
-GUEST_SRCS-y += xc_dom_elfloader.c
-GUEST_SRCS-y += xc_dom_binloader.c
-GUEST_SRCS-y += xc_dom_compat_linux.c
+GUEST_SRCS-y += xc_dom_core.c xc_dom_boot.c
+GUEST_SRCS-y += xc_dom_elfloader.c
+GUEST_SRCS-$(CONFIG_X86) += xc_dom_bzimageloader.c
+GUEST_SRCS-y += xc_dom_binloader.c
+GUEST_SRCS-y += xc_dom_compat_linux.c
GUEST_SRCS-$(CONFIG_X86) += xc_dom_x86.c
GUEST_SRCS-$(CONFIG_IA64) += xc_dom_ia64.c
diff -r 59b8768d0d0d -r 6777c62fc986 tools/libxc/xc_dom_bzimageloader.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/libxc/xc_dom_bzimageloader.c Thu Mar 06 11:16:55 2008 +0000
@@ -0,0 +1,159 @@
+/*
+ * Xen domain builder -- bzImage bits
+ *
+ * Parse and load bzImage kernel images.
+ *
+ * This relies on version 2.08 of the boot protocol, which contains an
+ * ELF file embedded in the bzImage. The loader extracts this ELF
+ * image and passes it off to the standard ELF loader.
+ *
+ * This code is licenced under the GPL.
+ * written 2006 by Gerd Hoffmann <kraxel@suse.de>.
+ * written 2007 by Jeremy Fitzhardinge <jeremy@xensource.com>
+ * written 2008 by Ian Campbell <ijc@hellion.org.uk>
+ *
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <inttypes.h>
+
+#include "xg_private.h"
+#include "xc_dom.h"
+
+struct setup_header {
+ uint8_t _pad0[0x1f1]; /* skip uninteresting stuff */
+ uint8_t setup_sects;
+ uint16_t root_flags;
+ uint32_t syssize;
+ uint16_t ram_size;
+ uint16_t vid_mode;
+ uint16_t root_dev;
+ uint16_t boot_flag;
+ uint16_t jump;
+ uint32_t header;
+#define HDR_MAGIC "HdrS"
+#define HDR_MAGIC_SZ 4
+ uint16_t version;
+#define VERSION(h,l) (((h)<<8) | (l))
+ uint32_t realmode_swtch;
+ uint16_t start_sys;
+ uint16_t kernel_version;
+ uint8_t type_of_loader;
+ uint8_t loadflags;
+ uint16_t setup_move_size;
+ uint32_t code32_start;
+ uint32_t ramdisk_image;
+ uint32_t ramdisk_size;
+ uint32_t bootsect_kludge;
+ uint16_t heap_end_ptr;
+ uint16_t _pad1;
+ uint32_t cmd_line_ptr;
+ uint32_t initrd_addr_max;
+ uint32_t kernel_alignment;
+ uint8_t relocatable_kernel;
+ uint8_t _pad2[3];
+ uint32_t cmdline_size;
+ uint32_t hardware_subarch;
+ uint64_t hardware_subarch_data;
+ uint32_t payload_offset;
+ uint32_t payload_length;
+} __attribute__((packed));
+
+extern struct xc_dom_loader elf_loader;
+
+static unsigned int payload_offset(struct setup_header *hdr)
+{
+ unsigned int off;
+
+ off = (hdr->setup_sects + 1) * 512;
+ off += hdr->payload_offset;
+ return off;
+}
+
+static int check_bzimage_kernel(struct xc_dom_image *dom, int verbose)
+{
+ struct setup_header *hdr;
+
+ if ( dom->kernel_blob == NULL )
+ {
+ if ( verbose )
+ xc_dom_panic(XC_INTERNAL_ERROR, "%s: no kernel image loaded\n",
+ __FUNCTION__);
+ return -EINVAL;
+ }
+ if ( dom->kernel_size < sizeof(struct setup_header) )
+ {
+ if ( verbose )
+ xc_dom_panic(XC_INTERNAL_ERROR, "%s: kernel image too small\n",
+ __FUNCTION__);
+ return -EINVAL;
+ }
+
+ hdr = dom->kernel_blob;
+
+ if ( memcmp(&hdr->header, HDR_MAGIC, HDR_MAGIC_SZ) != 0 )
+ {
+ if ( verbose )
+ xc_dom_panic(XC_INVALID_KERNEL, "%s: kernel is not a bzImage\n",
+ __FUNCTION__);
+ return -EINVAL;
+ }
+
+ if ( hdr->version < VERSION(2,8) )
+ {
+ if ( verbose )
+ xc_dom_panic(XC_INVALID_KERNEL, "%s: boot protocol too old (%04x)\n",
+ __FUNCTION__, hdr->version);
+ return -EINVAL;
+ }
+
+ dom->kernel_blob = dom->kernel_blob + payload_offset(hdr);
+ dom->kernel_size = hdr->payload_length;
+
+ if ( xc_dom_try_gunzip(dom, &dom->kernel_blob, &dom->kernel_size) == -1 )
+ {
+ if ( verbose )
+ xc_dom_panic(XC_INVALID_KERNEL, "%s: unable to decompress kernel\n",
+ __FUNCTION__);
+ return -EINVAL;
+ }
+
+ return elf_loader.probe(dom);
+}
+
+static int xc_dom_probe_bzimage_kernel(struct xc_dom_image *dom)
+{
+ return check_bzimage_kernel(dom, 0);
+}
+
+static int xc_dom_parse_bzimage_kernel(struct xc_dom_image *dom)
+{
+ return elf_loader.parser(dom);
+}
+
+static int xc_dom_load_bzimage_kernel(struct xc_dom_image *dom)
+{
+ return elf_loader.loader(dom);
+}
+
+static struct xc_dom_loader bzimage_loader = {
+ .name = "Linux bzImage",
+ .probe = xc_dom_probe_bzimage_kernel,
+ .parser = xc_dom_parse_bzimage_kernel,
+ .loader = xc_dom_load_bzimage_kernel,
+};
+
+static void __init register_loader(void)
+{
+ xc_dom_register_loader(&bzimage_loader);
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-set-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff -r 59b8768d0d0d -r 6777c62fc986 tools/libxc/xc_dom_elfloader.c
--- a/tools/libxc/xc_dom_elfloader.c Wed Mar 05 11:18:25 2008 +0000
+++ b/tools/libxc/xc_dom_elfloader.c Thu Mar 06 11:16:55 2008 +0000
@@ -281,7 +281,7 @@ static int xc_dom_load_elf_kernel(struct
/* ------------------------------------------------------------------------ */
-static struct xc_dom_loader elf_loader = {
+struct xc_dom_loader elf_loader = {
.name = "ELF-generic",
.probe = xc_dom_probe_elf_kernel,
.parser = xc_dom_parse_elf_kernel,
[-- Attachment #3: Type: text/plain, Size: 138 bytes --]
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: x86: Support loading Linux bzImage v2.08 and up.
2008-03-31 19:42 x86: Support loading Linux bzImage v2.08 and up Ian Campbell
@ 2008-04-03 10:01 ` Mark McLoughlin
2008-04-03 10:10 ` Ian Campbell
0 siblings, 1 reply; 4+ messages in thread
From: Mark McLoughlin @ 2008-04-03 10:01 UTC (permalink / raw)
To: Ian Campbell; +Cc: xen-devel, Keir Fraser
On Mon, 2008-03-31 at 20:42 +0100, Ian Campbell wrote:
> The latest -mm kernel (2.6.25-rc3-mm1) contains v2.08 of the Linux
> bzImage format which embeds an ELF file in place of the raw payload
> allowing it to be extracted and used by the Xen domain builder.
>
> It is expected that this functionality will be put forward for 2.6.26.
Any progress on supporting this for Dom0? i.e. adding support to the
hypervisor ...
Cheers,
Mark.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: x86: Support loading Linux bzImage v2.08 and up.
2008-04-03 10:01 ` Mark McLoughlin
@ 2008-04-03 10:10 ` Ian Campbell
0 siblings, 0 replies; 4+ messages in thread
From: Ian Campbell @ 2008-04-03 10:10 UTC (permalink / raw)
To: Mark McLoughlin; +Cc: xen-devel, Keir Fraser
On Thu, 2008-04-03 at 11:01 +0100, Mark McLoughlin wrote:
> On Mon, 2008-03-31 at 20:42 +0100, Ian Campbell wrote:
> > The latest -mm kernel (2.6.25-rc3-mm1) contains v2.08 of the Linux
> > bzImage format which embeds an ELF file in place of the raw payload
> > allowing it to be extracted and used by the Xen domain builder.
> >
> > It is expected that this functionality will be put forward for 2.6.26.
>
> Any progress on supporting this for Dom0? i.e. adding support to the
> hypervisor ...
It's not something I've been looking at. My main interest was in making
the Debian kernel packages work nicely in domU.
Ian.
>
> Cheers,
> Mark.
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel
--
Ian Campbell
Current Noise: Rollins Band - Saying Goodbye Again
You will always get the greatest recognition for the job you least like.
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2008-04-03 10:10 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
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2008-03-31 19:42 x86: Support loading Linux bzImage v2.08 and up Ian Campbell
2008-04-03 10:01 ` Mark McLoughlin
2008-04-03 10:10 ` Ian Campbell
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2008-03-13 18:40 Ian Campbell
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