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powerpc/pseries: Add FW_FEATURE_PLPKS feature flag

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Add a firmware feature flag, FW_FEATURE_PLPKS, to indicate availability of
Platform KeyStore related hcalls.

Check this flag in plpks_is_available() and pseries_plpks_init() before
trying to make an hcall.

Suggested-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Andrew Donnellan <ajd@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230224041012.772648-1-ajd@linux.ibm.com
This commit is contained in:
Andrew Donnellan 2023-02-24 15:10:12 +11:00 committed by Michael Ellerman
parent ae7312c090
commit df9cad0949
3 changed files with 8 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
arch/powerpc/include/asm/firmware.h
View file

@ -56,6 +56,7 @@
#define FW_FEATURE_FORM2_AFFINITY ASM_CONST(0x0000020000000000)
#define FW_FEATURE_ENERGY_SCALE_INFO ASM_CONST(0x0000040000000000)
#define FW_FEATURE_WATCHDOG ASM_CONST(0x0000080000000000)
#define FW_FEATURE_PLPKS ASM_CONST(0x0000100000000000)
#ifndef __ASSEMBLY__
@ -77,7 +78,8 @@ enum {
FW_FEATURE_DRC_INFO | FW_FEATURE_BLOCK_REMOVE |
FW_FEATURE_PAPR_SCM | FW_FEATURE_ULTRAVISOR |
FW_FEATURE_RPT_INVALIDATE | FW_FEATURE_FORM2_AFFINITY |
FW_FEATURE_ENERGY_SCALE_INFO | FW_FEATURE_WATCHDOG,
FW_FEATURE_ENERGY_SCALE_INFO | FW_FEATURE_WATCHDOG |
FW_FEATURE_PLPKS,
FW_FEATURE_PSERIES_ALWAYS = 0,
FW_FEATURE_POWERNV_POSSIBLE = FW_FEATURE_OPAL | FW_FEATURE_ULTRAVISOR,
FW_FEATURE_POWERNV_ALWAYS = 0,

1
arch/powerpc/platforms/pseries/firmware.c
View file

@ -68,6 +68,7 @@ hypertas_fw_features_table[] = {
{FW_FEATURE_RPT_INVALIDATE, "hcall-rpt-invalidate"},
{FW_FEATURE_ENERGY_SCALE_INFO, "hcall-energy-scale-info"},
{FW_FEATURE_WATCHDOG, "hcall-watchdog"},
{FW_FEATURE_PLPKS, "hcall-pks"},
};
/* Build up the firmware features bitmask using the contents of

5
arch/powerpc/platforms/pseries/plpks.c
View file

@ -378,7 +378,7 @@ bool plpks_is_available(void)
{
int rc;
if (!firmware_has_feature(FW_FEATURE_LPAR))
if (!firmware_has_feature(FW_FEATURE_PLPKS))
return false;
rc = _plpks_get_config();
@ -690,6 +690,9 @@ static __init int pseries_plpks_init(void)
{
int rc;
if (!firmware_has_feature(FW_FEATURE_PLPKS))
return -ENODEV;
rc = _plpks_get_config();
if (rc) {