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hw/smbios: support for type 41 (onboard devices extended information)

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Type 41 defines the attributes of devices that are onboard. The
original intent was to imply the BIOS had some level of control over
the enablement of the associated devices.

If network devices are present in this table, by default, udev will
name the corresponding interfaces enoX, X being the instance number.
Without such information, udev will fallback to using the PCI ID and
this usually gives ens3 or ens4. This can be a bit annoying as the
name of the network card may depend on the order of options and may
change if a new PCI device is added earlier on the commande line.
Being able to provide SMBIOS type 41 entry ensure the name of the
interface won't change and helps the user guess the right name without
booting a first time.

This can be invoked with:

    $QEMU -netdev user,id=internet
          -device virtio-net-pci,mac=50:54:00:00:00:42,netdev=internet,id=internet-dev \
          -smbios type=41,designation='Onboard LAN',instance=1,kind=ethernet,pcidev=internet-dev

The PCI segment is assumed to be 0. This should hold true for most
cases.

    $ dmidecode -t 41
    # dmidecode 3.3
    Getting SMBIOS data from sysfs.
    SMBIOS 2.8 present.

    Handle 0x2900, DMI type 41, 11 bytes
    Onboard Device
            Reference Designation: Onboard LAN
            Type: Ethernet
            Status: Enabled
            Type Instance: 1
            Bus Address: 0000:00:09.0

    $ ip -brief a
    lo               UNKNOWN        127.0.0.1/8 ::1/128
    eno1             UP             10.0.2.14/24 fec0::5254:ff:fe00:42/64 fe80::5254:ff:fe00:42/64

Signed-off-by: Vincent Bernat <vincent@bernat.ch>
Message-Id: <20210401171138.62970-1-vincent@bernat.ch>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Vincent Bernat 2021-04-01 19:11:38 +02:00 committed by Michael S. Tsirkin
parent 43bea44357
commit 05dfb447a4
5 changed files with 173 additions and 6 deletions
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7
hw/arm/virt.c
View File

@ -53,6 +53,7 @@
#include "sysemu/kvm.h"
#include "hw/loader.h"
#include "exec/address-spaces.h"
#include "qapi/error.h"
#include "qemu/bitops.h"
#include "qemu/error-report.h"
#include "qemu/module.h"
@ -1524,8 +1525,10 @@ static void virt_build_smbios(VirtMachineState *vms)
vmc->smbios_old_sys_ver ? "1.0" : mc->name, false,
true, SMBIOS_ENTRY_POINT_30);
smbios_get_tables(MACHINE(vms), NULL, 0, &smbios_tables, &smbios_tables_len,
&smbios_anchor, &smbios_anchor_len);
smbios_get_tables(MACHINE(vms), NULL, 0,
&smbios_tables, &smbios_tables_len,
&smbios_anchor, &smbios_anchor_len,
&error_fatal);
if (smbios_anchor) {
fw_cfg_add_file(vms->fw_cfg, "etc/smbios/smbios-tables",

4
hw/i386/fw_cfg.c
View File

@ -22,6 +22,7 @@
#include "hw/nvram/fw_cfg.h"
#include "e820_memory_layout.h"
#include "kvm/kvm_i386.h"
#include "qapi/error.h"
#include CONFIG_DEVICES
struct hpet_fw_config hpet_cfg = {.count = UINT8_MAX};
@ -78,7 +79,8 @@ void fw_cfg_build_smbios(MachineState *ms, FWCfgState *fw_cfg)
}
smbios_get_tables(ms, mem_array, array_count,
&smbios_tables, &smbios_tables_len,
&smbios_anchor, &smbios_anchor_len);
&smbios_anchor, &smbios_anchor_len,
&error_fatal);
g_free(mem_array);
if (smbios_anchor) {

124
hw/smbios/smbios.c
View File

@ -27,6 +27,7 @@
#include "hw/firmware/smbios.h"
#include "hw/loader.h"
#include "hw/boards.h"
#include "hw/pci/pci_bus.h"
#include "smbios_build.h"
/* legacy structures and constants for <= 2.0 machines */
@ -118,6 +119,28 @@ static struct {
uint16_t speed;
} type17;
static QEnumLookup type41_kind_lookup = {
.array = (const char *const[]) {
"other",
"unknown",
"video",
"scsi",
"ethernet",
"tokenring",
"sound",
"pata",
"sata",
"sas",
},
.size = 10
};
struct type41_instance {
const char *designation, *pcidev;
uint8_t instance, kind;
QTAILQ_ENTRY(type41_instance) next;
};
static QTAILQ_HEAD(, type41_instance) type41 = QTAILQ_HEAD_INITIALIZER(type41);
static QemuOptsList qemu_smbios_opts = {
.name = "smbios",
.head = QTAILQ_HEAD_INITIALIZER(qemu_smbios_opts.head),
@ -358,6 +381,32 @@ static const QemuOptDesc qemu_smbios_type17_opts[] = {
{ /* end of list */ }
};
static const QemuOptDesc qemu_smbios_type41_opts[] = {
{
.name = "type",
.type = QEMU_OPT_NUMBER,
.help = "SMBIOS element type",
},{
.name = "designation",
.type = QEMU_OPT_STRING,
.help = "reference designation string",
},{
.name = "kind",
.type = QEMU_OPT_STRING,
.help = "device type",
.def_value_str = "other",
},{
.name = "instance",
.type = QEMU_OPT_NUMBER,
.help = "device type instance",
},{
.name = "pcidev",
.type = QEMU_OPT_STRING,
.help = "PCI device",
},
{ /* end of list */ }
};
static void smbios_register_config(void)
{
qemu_add_opts(&qemu_smbios_opts);
@ -773,6 +822,53 @@ static void smbios_build_type_32_table(void)
SMBIOS_BUILD_TABLE_POST;
}
static void smbios_build_type_41_table(Error **errp)
{
unsigned instance = 0;
struct type41_instance *t41;
QTAILQ_FOREACH(t41, &type41, next) {
SMBIOS_BUILD_TABLE_PRE(41, 0x2900 + instance, true);
SMBIOS_TABLE_SET_STR(41, reference_designation_str, t41->designation);
t->device_type = t41->kind;
t->device_type_instance = t41->instance;
t->segment_group_number = cpu_to_le16(0);
t->bus_number = 0;
t->device_number = 0;
if (t41->pcidev) {
PCIDevice *pdev = NULL;
int rc = pci_qdev_find_device(t41->pcidev, &pdev);
if (rc != 0) {
error_setg(errp,
"No PCI device %s for SMBIOS type 41 entry %s",
t41->pcidev, t41->designation);
return;
}
/*
* We only handle the case were the device is attached to
* the PCI root bus. The general case is more complex as
* bridges are enumerated later and the table would need
* to be updated at this moment.
*/
if (!pci_bus_is_root(pci_get_bus(pdev))) {
error_setg(errp,
"Cannot create type 41 entry for PCI device %s: "
"not attached to the root bus",
t41->pcidev);
return;
}
t->segment_group_number = cpu_to_le16(0);
t->bus_number = pci_dev_bus_num(pdev);
t->device_number = pdev->devfn;
}
SMBIOS_BUILD_TABLE_POST;
instance++;
}
}
static void smbios_build_type_127_table(void)
{
SMBIOS_BUILD_TABLE_PRE(127, 0x7F00, true); /* required */
@ -883,7 +979,8 @@ void smbios_get_tables(MachineState *ms,
const struct smbios_phys_mem_area *mem_array,
const unsigned int mem_array_size,
uint8_t **tables, size_t *tables_len,
uint8_t **anchor, size_t *anchor_len)
uint8_t **anchor, size_t *anchor_len,
Error **errp)
{
unsigned i, dimm_cnt;
@ -928,6 +1025,7 @@ void smbios_get_tables(MachineState *ms,
smbios_build_type_32_table();
smbios_build_type_38_table();
smbios_build_type_41_table(errp);
smbios_build_type_127_table();
smbios_validate_table(ms);
@ -1224,6 +1322,30 @@ void smbios_entry_add(QemuOpts *opts, Error **errp)
save_opt(&type17.part, opts, "part");
type17.speed = qemu_opt_get_number(opts, "speed", 0);
return;
case 41: {
struct type41_instance *t;
Error *local_err = NULL;
if (!qemu_opts_validate(opts, qemu_smbios_type41_opts, errp)) {
return;
}
t = g_new0(struct type41_instance, 1);
save_opt(&t->designation, opts, "designation");
t->kind = qapi_enum_parse(&type41_kind_lookup,
qemu_opt_get(opts, "kind"),
0, &local_err) + 1;
t->kind |= 0x80; /* enabled */
if (local_err != NULL) {
error_propagate(errp, local_err);
g_free(t);
return;
}
t->instance = qemu_opt_get_number(opts, "instance", 1);
save_opt(&t->pcidev, opts, "pcidev");
QTAILQ_INSERT_TAIL(&type41, t, next);
return;
}
default:
error_setg(errp,
"Don't know how to build fields for SMBIOS type %ld",

14
include/hw/firmware/smbios.h
View File

@ -258,6 +258,17 @@ struct smbios_type_32 {
uint8_t boot_status;
} QEMU_PACKED;
/* SMBIOS type 41 - Onboard Devices Extended Information */
struct smbios_type_41 {
struct smbios_structure_header header;
uint8_t reference_designation_str;
uint8_t device_type;
uint8_t device_type_instance;
uint16_t segment_group_number;
uint8_t bus_number;
uint8_t device_number;
} QEMU_PACKED;
/* SMBIOS type 127 -- End-of-table */
struct smbios_type_127 {
struct smbios_structure_header header;
@ -273,5 +284,6 @@ void smbios_get_tables(MachineState *ms,
const struct smbios_phys_mem_area *mem_array,
const unsigned int mem_array_size,
uint8_t **tables, size_t *tables_len,
uint8_t **anchor, size_t *anchor_len);
uint8_t **anchor, size_t *anchor_len,
Error **errp);
#endif /* QEMU_SMBIOS_H */

30
qemu-options.hx
View File

@ -2370,7 +2370,9 @@ DEF("smbios", HAS_ARG, QEMU_OPTION_smbios,
" specify SMBIOS type 11 fields\n"
"-smbios type=17[,loc_pfx=str][,bank=str][,manufacturer=str][,serial=str]\n"
" [,asset=str][,part=str][,speed=%d]\n"
" specify SMBIOS type 17 fields\n",
" specify SMBIOS type 17 fields\n"
"-smbios type=41[,designation=str][,kind=str][,instance=%d][,pcidev=str]\n"
" specify SMBIOS type 41 fields\n",
QEMU_ARCH_I386 | QEMU_ARCH_ARM)
SRST
``-smbios file=binary``
@ -2432,6 +2434,32 @@ SRST
``-smbios type=17[,loc_pfx=str][,bank=str][,manufacturer=str][,serial=str][,asset=str][,part=str][,speed=%d]``
Specify SMBIOS type 17 fields
``-smbios type=41[,designation=str][,kind=str][,instance=%d][,pcidev=str]``
Specify SMBIOS type 41 fields
This argument can be repeated multiple times. Its main use is to allow network interfaces be created
as ``enoX`` on Linux, with X being the instance number, instead of the name depending on the interface
position on the PCI bus.
Here is an example of use:
.. parsed-literal::
-netdev user,id=internet \\
-device virtio-net-pci,mac=50:54:00:00:00:42,netdev=internet,id=internet-dev \\
-smbios type=41,designation='Onboard LAN',instance=1,kind=ethernet,pcidev=internet-dev
In the guest OS, the device should then appear as ``eno1``:
..parsed-literal::
$ ip -brief l
lo UNKNOWN 00:00:00:00:00:00 <LOOPBACK,UP,LOWER_UP>
eno1 UP 50:54:00:00:00:42 <BROADCAST,MULTICAST,UP,LOWER_UP>
Currently, the PCI device has to be attached to the root bus.
ERST
DEFHEADING()