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dbus: add 'ConfidentialVirtualization' property to manager object

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This property reports whether the system is running inside a confidential
virtual machine.

Related: https://github.com/systemd/systemd/issues/27604
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrangé 2023-07-03 09:53:43 +01:00 committed by Luca Boccassi
parent 95d043b159
commit 1257274ad8
2 changed files with 33 additions and 0 deletions
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10
man/org.freedesktop.systemd1.xml
View File

@ -305,6 +305,8 @@ node /org/freedesktop/systemd1 {
@org.freedesktop.DBus.Property.EmitsChangedSignal("const")
readonly s Virtualization = '...';
@org.freedesktop.DBus.Property.EmitsChangedSignal("const")
readonly s ConfidentialVirtualization = '...';
@org.freedesktop.DBus.Property.EmitsChangedSignal("const")
readonly s Architecture = '...';
@org.freedesktop.DBus.Property.EmitsChangedSignal("const")
readonly s Tainted = '...';
@ -1010,6 +1012,8 @@ node /org/freedesktop/systemd1 {
<variablelist class="dbus-property" generated="True" extra-ref="Virtualization"/>
<variablelist class="dbus-property" generated="True" extra-ref="ConfidentialVirtualization"/>
<variablelist class="dbus-property" generated="True" extra-ref="Architecture"/>
<variablelist class="dbus-property" generated="True" extra-ref="Tainted"/>
@ -1765,6 +1769,12 @@ node /org/freedesktop/systemd1 {
Note that only the "innermost" virtualization technology is exported here. This detects both
full-machine virtualizations (VMs) and shared-kernel virtualization (containers).</para>
<para><varname>ConfidentialVirtualization</varname> contains a short ID string describing the confidential
virtualization technology the system runs in. On bare-metal hardware this is the empty string. Otherwise,
it contains an identifier such as <literal>sev</literal>, <literal>sev-es</literal>, <literal>sev-snp</literal>,
<literal>tdx</literal> and so on. For a full list of IDs see
<citerefentry><refentrytitle>systemd-detect-virt</refentrytitle><manvolnum>1</manvolnum></citerefentry></para>.
<para><varname>Architecture</varname> contains a short ID string describing the architecture the
systemd instance is running on. This follows the same vocabulary as
<varname>ConditionArchitectures=</varname>.</para>

23
src/core/dbus-manager.c
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@ -12,6 +12,7 @@
#include "bus-get-properties.h"
#include "bus-log-control-api.h"
#include "chase.h"
#include "confidential-virt.h"
#include "data-fd-util.h"
#include "dbus-cgroup.h"
#include "dbus-execute.h"
@ -91,6 +92,27 @@ static int property_get_virtualization(
v == VIRTUALIZATION_NONE ? NULL : virtualization_to_string(v));
}
static int property_get_confidential_virtualization(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *error) {
ConfidentialVirtualization v;
assert(bus);
assert(reply);
v = detect_confidential_virtualization();
return sd_bus_message_append(
reply, "s",
v <= 0 ? NULL : confidential_virtualization_to_string(v));
}
static int property_get_tainted(
sd_bus *bus,
const char *path,
@ -2920,6 +2942,7 @@ const sd_bus_vtable bus_manager_vtable[] = {
SD_BUS_PROPERTY("Version", "s", property_get_version, 0, SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("Features", "s", property_get_features, 0, SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("Virtualization", "s", property_get_virtualization, 0, SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("ConfidentialVirtualization", "s", property_get_confidential_virtualization, 0, SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("Architecture", "s", property_get_architecture, 0, SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("Tainted", "s", property_get_tainted, 0, SD_BUS_VTABLE_PROPERTY_CONST),
BUS_PROPERTY_DUAL_TIMESTAMP("FirmwareTimestamp", offsetof(Manager, timestamps[MANAGER_TIMESTAMP_FIRMWARE]), SD_BUS_VTABLE_PROPERTY_CONST),