Currently there is no way to know the TDX Module version from the userspace. Such information is always helpful for bug reporting or debugging. With the tdx-host device in place, expose the TDX Module version as a device attribute via sysfs. Signed-off-by: Chao Gao --- v2: - No need to update MAINTAINERS to include sysfs-devices-faux-tdx-host explicitly (Kirill) .../ABI/testing/sysfs-devices-faux-tdx-host | 6 +++++ drivers/virt/coco/tdx-host/tdx-host.c | 26 ++++++++++++++++++- 2 files changed, 31 insertions(+), 1 deletion(-) create mode 100644 Documentation/ABI/testing/sysfs-devices-faux-tdx-host diff --git a/Documentation/ABI/testing/sysfs-devices-faux-tdx-host b/Documentation/ABI/testing/sysfs-devices-faux-tdx-host new file mode 100644 index 000000000000..35ef21f53c2e --- /dev/null +++ b/Documentation/ABI/testing/sysfs-devices-faux-tdx-host @@ -0,0 +1,6 @@ +What: /sys/devices/faux/tdx_host/version +Contact: linux-coco@lists.linux.dev +Description: (RO) Report the version of the loaded TDX Module. The TDX Module + version is formatted as x.y.z, where "x" is the major version, + "y" is the minor version and "z" is the update version. Versions + are used for bug reporting, TD-Preserving updates and etc. diff --git a/drivers/virt/coco/tdx-host/tdx-host.c b/drivers/virt/coco/tdx-host/tdx-host.c index ced1c980dc6f..2883c6638faf 100644 --- a/drivers/virt/coco/tdx-host/tdx-host.c +++ b/drivers/virt/coco/tdx-host/tdx-host.c @@ -9,6 +9,7 @@ #include #include #include +#include static const struct x86_cpu_id tdx_host_ids[] = { X86_MATCH_FEATURE(X86_FEATURE_TDX_HOST_PLATFORM, NULL), @@ -18,12 +19,35 @@ MODULE_DEVICE_TABLE(x86cpu, tdx_host_ids); static struct faux_device *fdev; +static ssize_t version_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + const struct tdx_sys_info *tdx_sysinfo = tdx_get_sysinfo(); + const struct tdx_sys_info_version *ver; + + if (!tdx_sysinfo) + return -ENXIO; + + ver = &tdx_sysinfo->version; + + return sysfs_emit(buf, "%u.%u.%02u\n", ver->major_version, + ver->minor_version, + ver->update_version); +} +static DEVICE_ATTR_RO(version); + +static struct attribute *tdx_host_attrs[] = { + &dev_attr_version.attr, + NULL, +}; +ATTRIBUTE_GROUPS(tdx_host); + static int __init tdx_host_init(void) { if (!x86_match_cpu(tdx_host_ids)) return -ENODEV; - fdev = faux_device_create(KBUILD_MODNAME, NULL, NULL); + fdev = faux_device_create_with_groups(KBUILD_MODNAME, NULL, NULL, tdx_host_groups); if (!fdev) return -ENODEV; -- 2.47.3