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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v4 05/14] libxl: Load guest BIOS from file
The path to the BIOS blob can be override by the xl's bios_override option,
or provided by u.hvm.bios_firmware in the domain_build_info struct by other
libxl user.
Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---
Change in V4:
- updating man page to have bios_override described.
- return ERROR_INVAL in libxl__load_hvm_firmware_module when the file is
empty.
Change in V3:
- move seabios_path and ovmf_path to libxl_path.c (with renaming)
- fix some coding style
- warn for empty file
- remove rombios stuff (will still be built-in hvmloader)
- rename field bios_filename in domain_build_info to bios_firmware to
follow naming of acpi and smbios.
- log an error after libxl_read_file_contents() only when it return ENOENT
- return an error on empty file.
- added #define LIBXL_HAVE_BUILDINFO_HVM_BIOS_FIRMWARE
---
docs/man/xl.cfg.pod.5 | 9 +++++++
tools/libxl/libxl.h | 8 +++++++
tools/libxl/libxl_dom.c | 57 ++++++++++++++++++++++++++++++++++++++++++++
tools/libxl/libxl_internal.h | 2 ++
tools/libxl/libxl_paths.c | 10 ++++++++
tools/libxl/libxl_types.idl | 1 +
tools/libxl/xl_cmdimpl.c | 11 ++++++---
7 files changed, 95 insertions(+), 3 deletions(-)
diff --git a/docs/man/xl.cfg.pod.5 b/docs/man/xl.cfg.pod.5
index 56b1117..165915b 100644
--- a/docs/man/xl.cfg.pod.5
+++ b/docs/man/xl.cfg.pod.5
@@ -1121,6 +1121,15 @@ Requires device_model_version=qemu-xen.
=back
+=item B<bios_override="PATH">
+
+Override the path to the blob to be used as BIOS. The blob provided here MUST
+be consistent with the `bios` which you have specified. You should not normally
+need to specify this option.
+
+This options does not have any effect if using bios="rombios" or
+device_model_version="qemu-xen-traditional".
+
=item B<pae=BOOLEAN>
Hide or expose the IA32 Physical Address Extensions. These extensions
diff --git a/tools/libxl/libxl.h b/tools/libxl/libxl.h
index f9e3ef5..d06c6c5 100644
--- a/tools/libxl/libxl.h
+++ b/tools/libxl/libxl.h
@@ -884,6 +884,14 @@ void libxl_mac_copy(libxl_ctx *ctx, libxl_mac *dst,
libxl_mac *src);
#define LIBXL_HAVE_CHECKPOINTED_STREAM 1
/*
+ * LIBXL_HAVE_BUILDINFO_HVM_BIOS_FIRMWARE
+ *
+ * libxl_domain_build_info has u.hvm.bios_firmware field which can be use
+ * to provide a different bios blob (like SeaBIOS or OVMF).
+ */
+#define LIBXL_HAVE_BUILDINFO_HVM_BIOS_FIRMWARE
+
+/*
* ERROR_REMUS_XXX error code only exists from Xen 4.5, Xen 4.6 and it
* is changed to ERROR_CHECKPOINT_XXX in Xen 4.7
*/
diff --git a/tools/libxl/libxl_dom.c b/tools/libxl/libxl_dom.c
index b825b98..c112cc5 100644
--- a/tools/libxl/libxl_dom.c
+++ b/tools/libxl/libxl_dom.c
@@ -862,6 +862,38 @@ err:
return ret;
}
+static int libxl__load_hvm_firmware_module(libxl__gc *gc,
+ const char *filename,
+ const char *what,
+ struct xc_hvm_firmware_module *m)
+{
+ int datalen = 0;
+ void *data = NULL;
+ int e;
+
+ LOG(DEBUG, "Loading %s: %s", what, filename);
+ e = libxl_read_file_contents(CTX, filename, &data, &datalen);
+ if (e) {
+ /*
+ * Print a message only on ENOENT, other error are logged by the
+ * function libxl_read_file_contents().
+ */
+ if (e == ENOENT)
+ LOGEV(ERROR, e, "failed to read %s file", what);
+ return ERROR_FAIL;
+ }
+ libxl__ptr_add(gc, data);
+ if (datalen) {
+ /* Only accept non-empty files */
+ m->data = data;
+ m->length = datalen;
+ } else {
+ LOG(ERROR, "file %s for %s is empty", filename, what);
+ return ERROR_INVAL;
+ }
+ return 0;
+}
+
static int libxl__domain_firmware(libxl__gc *gc,
libxl_domain_build_info *info,
struct xc_dom_image *dom)
@@ -871,6 +903,7 @@ static int libxl__domain_firmware(libxl__gc *gc,
int e, rc;
int datalen = 0;
void *data;
+ const char *bios_filename = NULL;
if (info->u.hvm.firmware)
firmware = info->u.hvm.firmware;
@@ -914,6 +947,30 @@ static int libxl__domain_firmware(libxl__gc *gc,
goto out;
}
+ if (info->device_model_version == LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN) {
+ if (info->u.hvm.bios_firmware) {
+ bios_filename = info->u.hvm.bios_firmware;
+ } else {
+ switch (info->u.hvm.bios) {
+ case LIBXL_BIOS_TYPE_SEABIOS:
+ bios_filename = libxl__seabios_path();
+ break;
+ case LIBXL_BIOS_TYPE_OVMF:
+ bios_filename = libxl__ovmf_path();
+ break;
+ case LIBXL_BIOS_TYPE_ROMBIOS:
+ default:
+ abort();
+ }
+ }
+ }
+
+ if (bios_filename) {
+ rc = libxl__load_hvm_firmware_module(gc, bios_filename, "BIOS",
+ &dom->bios_module);
+ if (rc) goto out;
+ }
+
if (info->u.hvm.smbios_firmware) {
data = NULL;
e = libxl_read_file_contents(ctx, info->u.hvm.smbios_firmware,
diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h
index 005fe53..af3ba9a 100644
--- a/tools/libxl/libxl_internal.h
+++ b/tools/libxl/libxl_internal.h
@@ -2265,6 +2265,8 @@ _hidden const char *libxl__xen_config_dir_path(void);
_hidden const char *libxl__xen_script_dir_path(void);
_hidden const char *libxl__lock_dir_path(void);
_hidden const char *libxl__run_dir_path(void);
+_hidden const char *libxl__seabios_path(void);
+_hidden const char *libxl__ovmf_path(void);
/*----- subprocess execution with timeout -----*/
diff --git a/tools/libxl/libxl_paths.c b/tools/libxl/libxl_paths.c
index 9b7b0d5..6972b90 100644
--- a/tools/libxl/libxl_paths.c
+++ b/tools/libxl/libxl_paths.c
@@ -35,6 +35,16 @@ const char *libxl__run_dir_path(void)
return XEN_RUN_DIR;
}
+const char *libxl__seabios_path(void)
+{
+ return SEABIOS_PATH;
+}
+
+const char *libxl__ovmf_path(void)
+{
+ return OVMF_PATH;
+}
+
/*
* Local variables:
* mode: C
diff --git a/tools/libxl/libxl_types.idl b/tools/libxl/libxl_types.idl
index 632c009..3978fd9 100644
--- a/tools/libxl/libxl_types.idl
+++ b/tools/libxl/libxl_types.idl
@@ -493,6 +493,7 @@ libxl_domain_build_info = Struct("domain_build_info",[
("timer_mode", libxl_timer_mode),
("nested_hvm", libxl_defbool),
("altp2m", libxl_defbool),
+ ("bios_firmware", string),
("smbios_firmware", string),
("acpi_firmware", string),
("hdtype", libxl_hdtype),
diff --git a/tools/libxl/xl_cmdimpl.c b/tools/libxl/xl_cmdimpl.c
index 990d3c9..08ceede 100644
--- a/tools/libxl/xl_cmdimpl.c
+++ b/tools/libxl/xl_cmdimpl.c
@@ -1505,12 +1505,17 @@ static void parse_config_data(const char *config_source,
xlu_cfg_replace_string (config, "firmware_override",
&b_info->u.hvm.firmware, 0);
- if (!xlu_cfg_get_string(config, "bios", &buf, 0) &&
- libxl_bios_type_from_string(buf, &b_info->u.hvm.bios)) {
+ xlu_cfg_replace_string (config, "bios_override",
+ &b_info->u.hvm.bios_firmware, 0);
+ if (!xlu_cfg_get_string(config, "bios", &buf, 0)) {
+ if (libxl_bios_type_from_string(buf, &b_info->u.hvm.bios)) {
fprintf(stderr, "ERROR: invalid value \"%s\" for \"bios\"\n",
buf);
exit (1);
- }
+ }
+ } else if (b_info->u.hvm.bios_firmware)
+ fprintf(stderr, "WARNING: "
+ "bios_override given without specific bios name\n");
xlu_cfg_get_defbool(config, "pae", &b_info->u.hvm.pae, 0);
xlu_cfg_get_defbool(config, "apic", &b_info->u.hvm.apic, 0);
--
Anthony PERARD
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