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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/mm | |
| parent | 7cdd3745f2d75aecc2b61368e2563ae54bfac59a (diff) | |
| download | lwn-000a42b35a54372597f0657f6b9875b38c641864.tar.gz lwn-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/mm')
| -rw-r--r-- | arch/powerpc/mm/book3s64/pgtable.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/powerpc/mm/book3s64/pgtable.c b/arch/powerpc/mm/book3s64/pgtable.c index 85de5b574dd7..e18ae50a275c 100644 --- a/arch/powerpc/mm/book3s64/pgtable.c +++ b/arch/powerpc/mm/book3s64/pgtable.c @@ -15,6 +15,7 @@ #include <asm/powernv.h> #include <asm/firmware.h> #include <asm/ultravisor.h> +#include <asm/kexec.h> #include <mm/mmu_decl.h> #include <trace/events/thp.h> @@ -165,6 +166,8 @@ void mmu_cleanup_all(void) radix__mmu_cleanup_all(); else if (mmu_hash_ops.hpte_clear_all) mmu_hash_ops.hpte_clear_all(); + + reset_sprs(); } #ifdef CONFIG_MEMORY_HOTPLUG |