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. > \ 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.
