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powerpc/pseries: Add helper to get PLPKS password length

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[ Upstream commit 9ee76bd5c7 ]

Add helper function to get the PLPKS password length. This will be used
in a later patch to support passing the password between kernels over
kexec.

Signed-off-by: Russell Currey <ruscur@russell.cc>
Signed-off-by: Andrew Donnellan <ajd@linux.ibm.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20230210080401.345462-23-ajd@linux.ibm.com
Stable-dep-of: 932bed4121 ("powerpc/kexec_file: fix cpus node update to FDT")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Russell Currey 2023-02-10 19:03:57 +11:00 committed by Greg Kroah-Hartman
parent ef27c8adce
commit d746b2f0c2
2 changed files with 10 additions and 0 deletions
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5
arch/powerpc/include/asm/plpks.h
View file

@ -153,6 +153,11 @@ u32 plpks_get_maxlargeobjectsize(void);
*/
u64 plpks_get_signedupdatealgorithms(void);
/**
* Returns the length of the PLPKS password in bytes.
*/
u16 plpks_get_passwordlen(void);
#endif // CONFIG_PSERIES_PLPKS
#endif // _ASM_POWERPC_PLPKS_H

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

@ -348,6 +348,11 @@ u64 plpks_get_signedupdatealgorithms(void)
return signedupdatealgorithms;
}
u16 plpks_get_passwordlen(void)
{
return ospasswordlength;
}
bool plpks_is_available(void)
{
int rc;