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| author | Nicholas Piggin <npiggin@gmail.com> | 2017-12-22 21:17:10 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-01-18 00:42:58 +1100 |
| commit | 47fee31dbdbd642d444c67a4df814339f6d8dd61 (patch) | |
| tree | c7bacb6814d67247e79df430ebac5114d6648182 /arch/powerpc/kernel/entry_64.S | |
| parent | 98ae0069cb78ca4f5d14f203e3bb43874591123f (diff) | |
| download | linux-47fee31dbdbd642d444c67a4df814339f6d8dd61.tar.gz | |
powerpc/64: rtas avoid accessing paca in 32-bit mode
Commit 177ba7c647f3 ("powerpc/mm/radix: Limit paca allocation in radix")
limited the paca allocation address to 1G on pSeries because RTAS return
accesses the paca in 32-bit mode:
On return from RTAS we access the paca variables and we have 64 bit
disabled. This requires us to limit paca in 32 bit range.
Fix this by setting ppc64_rma_size to first_memblock_size/1G range.
Avoid this limit by switching to 64-bit mode before accessing any memory.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel/entry_64.S')
| -rw-r--r-- | arch/powerpc/kernel/entry_64.S | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S index 36878b6ee8b826..371c05fe250adb 100644 --- a/arch/powerpc/kernel/entry_64.S +++ b/arch/powerpc/kernel/entry_64.S @@ -1083,6 +1083,17 @@ __enter_rtas: rtas_return_loc: FIXUP_ENDIAN + /* + * Clear RI and set SF before anything. + */ + mfmsr r6 + li r0,MSR_RI + andc r6,r6,r0 + sldi r0,r0,(MSR_SF_LG - MSR_RI_LG) + or r6,r6,r0 + sync + mtmsrd r6 + /* relocation is off at this point */ GET_PACA(r4) clrldi r4,r4,2 /* convert to realmode address */ @@ -1091,12 +1102,6 @@ rtas_return_loc: 0: mflr r3 ld r3,(1f-0b)(r3) /* get &rtas_restore_regs */ - mfmsr r6 - li r0,MSR_RI - andc r6,r6,r0 - sync - mtmsrd r6 - ld r1,PACAR1(r4) /* Restore our SP */ ld r4,PACASAVEDMSR(r4) /* Restore our MSR */ |