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powerpc/pseries: Avoid hcall in plpks_is_available() on non-pseries

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plpks_is_available() can be called on any platform via kexec but calls
_plpks_get_config() which makes a hcall, which will only work on pseries.
Fix this by returning early in plpks_is_available() if hcalls aren't
possible.

Fixes: 119da30d03 ("powerpc/pseries: Expose PLPKS config values, support additional fields")
Reported-by: Murphy Zhou <jencce.kernel@gmail.com>
Signed-off-by: Russell Currey <ruscur@russell.cc>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20230222021708.146257-1-ruscur@russell.cc
This commit is contained in:
Russell Currey 2023-02-22 13:17:08 +11:00 committed by Michael Ellerman
parent bec4646256
commit f82cdc37c4
1 changed files with 4 additions and 0 deletions
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4
arch/powerpc/platforms/pseries/plpks.c
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@ -22,6 +22,7 @@
#include <asm/hvcall.h>
#include <asm/machdep.h>
#include <asm/plpks.h>
#include <asm/firmware.h>
static u8 *ospassword;
static u16 ospasswordlength;
@ -377,6 +378,9 @@ bool plpks_is_available(void)
{
int rc;
if (!firmware_has_feature(FW_FEATURE_LPAR))
return false;
rc = _plpks_get_config();
if (rc)
return false;