On 4/26/22, Mike Rapoport <rppt@xxxxxxxxxx> wrote: > On Mon, Apr 25, 2022 at 02:15:26PM -0300, Martin Fernandez wrote: >> Show in each node in sysfs if its memory is able to do be encrypted by >> the CPU, ie. if all its memory is marked with EFI_MEMORY_CPU_CRYPTO in >> the EFI memory map. >> >> Signed-off-by: Martin Fernandez <martin.fernandez@xxxxxxxxxxxxx> >> --- >> Documentation/ABI/testing/sysfs-devices-node | 10 ++++++++++ >> drivers/base/node.c | 10 ++++++++++ >> 2 files changed, 20 insertions(+) >> create mode 100644 Documentation/ABI/testing/sysfs-devices-node >> >> diff --git a/Documentation/ABI/testing/sysfs-devices-node >> b/Documentation/ABI/testing/sysfs-devices-node >> new file mode 100644 >> index 000000000000..5fd5dc7fc2eb >> --- /dev/null >> +++ b/Documentation/ABI/testing/sysfs-devices-node >> @@ -0,0 +1,10 @@ >> +What: /sys/devices/system/node/nodeX/crypto_capable >> +Date: April 2022 >> +Contact: Martin Fernandez <martin.fernandez@xxxxxxxxxxxxx> >> +Users: fwupd (https://fwupd.org) >> +Description: >> + This value is 1 if all system memory in this node is >> + marked with EFI_MEMORY_CPU_CRYPTO, indicating that the >> + system memory is capable of being protected with the >> + CPU’s memory cryptographic capabilities. It is 0 >> + otherwise. > > I understand that currently this feature is only for x86, but if non-EFI > architectures will start using MEMBLOCK_CRYPTO_CAPABLE, the sysfs attribute > for will be relevant form them as well. > > How about > This value is 1 if all system memory in this node is capable of > being protected with the CPU's memory cryptographic capabilities. > It is 0 otherwise. > On EFI systems the node will be marked with EFI_MEMORY_CPU_CRYPTO. > Good point. I'll change it. >> \ No newline at end of file >> diff --git a/drivers/base/node.c b/drivers/base/node.c >> index ec8bb24a5a22..1df15ea03c27 100644 >> --- a/drivers/base/node.c >> +++ b/drivers/base/node.c >> @@ -560,11 +560,21 @@ static ssize_t node_read_distance(struct device >> *dev, >> } >> static DEVICE_ATTR(distance, 0444, node_read_distance, NULL); >> >> +static ssize_t crypto_capable_show(struct device *dev, >> + struct device_attribute *attr, char *buf) >> +{ >> + struct pglist_data *pgdat = NODE_DATA(dev->id); >> + >> + return sysfs_emit(buf, "%d\n", pgdat->crypto_capable); >> +} >> +static DEVICE_ATTR_RO(crypto_capable); >> + >> static struct attribute *node_dev_attrs[] = { >> &dev_attr_meminfo.attr, >> &dev_attr_numastat.attr, >> &dev_attr_distance.attr, >> &dev_attr_vmstat.attr, >> + &dev_attr_crypto_capable.attr, >> NULL >> }; >> >> -- >> 2.30.2 >> > > -- > Sincerely yours, > Mike. >
