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| author |   Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> | 2020-07-09 08:59:41 +0530 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2020-07-20 22:57:59 +1000 |
| commit | 000a42b35a54372597f0657f6b9875b38c641864 (patch) | |
| tree | 755256c0c901e1437d79c4c336de70075ff40975 /arch/powerpc/kernel/misc_64.S | |
| parent | powerpc/book3s64/keys: Print information during boot. (diff) | |
| download | linux-dev-000a42b35a54372597f0657f6b9875b38c641864.tar.xz linux-dev-000a42b35a54372597f0657f6b9875b38c641864.zip | |
powerpc/book3s64/keys/kuap: Reset AMR/IAMR values on kexec
As we kexec across kernels that use AMR/IAMR for different purposes
we need to ensure that new kernels get kexec'd with a reset value
of AMR/IAMR. For ex: the new kernel can use key 0 for kernel mapping and the old
AMR value prevents access to key 0.
This patch also removes reset if IAMR and AMOR in kexec_sequence. Reset of AMOR
is not needed and the IAMR reset is partial (it doesn't do the reset
on secondary cpus) and is redundant with this patch.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200709032946.881753-19-aneesh.kumar@linux.ibm.com
Diffstat (limited to 'arch/powerpc/kernel/misc_64.S')
| -rw-r--r-- | arch/powerpc/kernel/misc_64.S | 14 |
1 files changed, 0 insertions, 14 deletions
diff --git a/arch/powerpc/kernel/misc_64.S b/arch/powerpc/kernel/misc_64.S index 1864605eca29..7bb46ad98207 100644 --- a/arch/powerpc/kernel/misc_64.S +++ b/arch/powerpc/kernel/misc_64.S @@ -413,20 +413,6 @@ _GLOBAL(kexec_sequence) li r0,0 std r0,16(r1) -BEGIN_FTR_SECTION - /* - * This is the best time to turn AMR/IAMR off. - * key 0 is used in radix for supervisor<->user - * protection, but on hash key 0 is reserved - * ideally we want to enter with a clean state. - * NOTE, we rely on r0 being 0 from above. - */ - mtspr SPRN_IAMR,r0 -BEGIN_FTR_SECTION_NESTED(42) - mtspr SPRN_AMOR,r0 -END_FTR_SECTION_NESTED_IFSET(CPU_FTR_HVMODE, 42) -END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300) - /* save regs for local vars on new stack. * yes, we won't go back, but ... */ |