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| author | Nicholas Piggin <npiggin@gmail.com> | 2017-01-27 05:00:34 +0100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-01-31 09:07:39 +0100 |
| commit | a97a65d53d9f53b6897dc1b2aed381bc1707136b (patch) | |
| tree | 08dcf2d0b98a978d80bf09dc5f6829e9831c7bb5 /arch/powerpc/kernel | |
| parent | KVM: PPC: Book3S: Move 64-bit KVM interrupt handler out from alt section (diff) | |
| download | linux-a97a65d53d9f53b6897dc1b2aed381bc1707136b.tar.xz linux-a97a65d53d9f53b6897dc1b2aed381bc1707136b.zip | |
KVM: PPC: Book3S: 64-bit CONFIG_RELOCATABLE support for interrupts
64-bit Book3S exception handlers must find the dynamic kernel base
to add to the target address when branching beyond __end_interrupts,
in order to support kernel running at non-0 physical address.
Support this in KVM by branching with CTR, similarly to regular
interrupt handlers. The guest CTR saved in HSTATE_SCRATCH1 and
restored after the branch.
Without this, the host kernel hangs and crashes randomly when it is
running at a non-0 address and a KVM guest is started.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Acked-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel')
| -rw-r--r-- | arch/powerpc/kernel/exceptions-64s.S | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S index 89b4f122aec6..65a2559eeb7f 100644 --- a/arch/powerpc/kernel/exceptions-64s.S +++ b/arch/powerpc/kernel/exceptions-64s.S @@ -142,7 +142,7 @@ END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_300) lbz r0,HSTATE_HWTHREAD_REQ(r13) cmpwi r0,0 beq 1f - b kvm_start_guest + BRANCH_TO_KVM(r10, kvm_start_guest) 1: #endif |