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| author | Daniel P. Berrange <berrange@redhat.com> | 2017-10-28 21:51:36 +0100 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2017-12-05 19:13:45 +0200 |
| commit | 2d6dcbf93fb01b4a7f45a93d276d4d74b16392dd (patch) | |
| tree | b4875db763ef63618bb6a8aeb84e43b6cc38ce14 /hw/smbios/smbios_build.h | |
| parent | 2babfe0c9241c239272a03fec785165a50e8288c (diff) | |
| download | qemu-2d6dcbf93fb01b4a7f45a93d276d4d74b16392dd.zip qemu-2d6dcbf93fb01b4a7f45a93d276d4d74b16392dd.tar.gz qemu-2d6dcbf93fb01b4a7f45a93d276d4d74b16392dd.tar.bz2 | |
smbios: support setting OEM strings table
The cloud-init program currently allows fetching of its data by repurposing of
the 'system' type 'serial' field. This is a clear abuse of the serial field that
would clash with other valid usage a virt management app might have for that
field.
Fortunately the SMBIOS defines an "OEM Strings" table whose puporse is to allow
exposing of arbitrary vendor specific strings to the operating system. This is
perfect for use with cloud-init, or as a way to pass arguments to OS installers
such as anaconda.
This patch makes it easier to support this with QEMU. e.g.
$QEMU -smbios type=11,value=Hello,value=World,value=Tricky,,value=test
Which results in the guest seeing dmidecode data
Handle 0x0E00, DMI type 11, 5 bytes
OEM Strings
String 1: Hello
String 2: World
String 3: Tricky,value=test
It is suggested that any app wanting to make use of this OEM strings capability
for accepting data from the host mgmt layer should use its name as a string
prefix. e.g. to expose OEM strings targetting both cloud init and anaconda in
parallel the mgmt app could set
$QEMU -smbios type=11,value=cloud-init:ds=nocloud-net;s=http://10.10.0.1:8000/,\
value=anaconda:method=http://dl.fedoraproject.org/pub/fedora/linux/releases/25/x86_64/os
which would appear as
Handle 0x0E00, DMI type 11, 5 bytes
OEM Strings
String 1: cloud-init:ds=nocloud-net;s=http://10.10.0.1:8000/
String 2: anaconda:method=http://dl.fedoraproject.org/pub/fedora/linux/releases/25/x86_64/os
Use of such string prefixes means the app won't have to care which string slot
its data appears in.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'hw/smbios/smbios_build.h')
| -rw-r--r-- | hw/smbios/smbios_build.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/hw/smbios/smbios_build.h b/hw/smbios/smbios_build.h index 68b8b72..93b360d 100644 --- a/hw/smbios/smbios_build.h +++ b/hw/smbios/smbios_build.h @@ -63,6 +63,18 @@ extern unsigned smbios_table_cnt; } \ } while (0) +#define SMBIOS_TABLE_SET_STR_LIST(tbl_type, value) \ + do { \ + int len = (value != NULL) ? strlen(value) + 1 : 0; \ + if (len > 1) { \ + smbios_tables = g_realloc(smbios_tables, \ + smbios_tables_len + len); \ + memcpy(smbios_tables + smbios_tables_len, value, len); \ + smbios_tables_len += len; \ + ++str_index; \ + } \ + } while (0) + #define SMBIOS_BUILD_TABLE_POST \ do { \ size_t term_cnt, t_size; \ |