Will Deacon <w...@kernel.org> writes:
> Commit ad6c00283163 ("swiotlb: Free tbl memory in swiotlb_exit()")
> introduced a set_memory_encrypted() call to swiotlb_exit() so that the
> buffer pages are returned to an encrypted state prior to being freed.
>
> Sachin reports that this leads to the following crash on a Power server:
>
> [ 0.010799] software IO TLB: tearing down default memory pool
> [ 0.010805] ------------[ cut here ]------------
> [ 0.010808] kernel BUG at arch/powerpc/kernel/interrupt.c:98!
>
> Nick spotted that this is because set_memory_encrypted() is issuing an
> ultracall which doesn't exist for the processor, and should therefore
> be gated by mem_encrypt_active() to mirror the x86 implementation.
>
> Cc: Konrad Rzeszutek Wilk <konrad.w...@oracle.com>
> Cc: Claire Chang <tien...@chromium.org>
> Cc: Christoph Hellwig <h...@lst.de>
> Cc: Robin Murphy <robin.mur...@arm.com>
> Fixes: ad6c00283163 ("swiotlb: Free tbl memory in swiotlb_exit()")
> Suggested-by: Nicholas Piggin <npig...@gmail.com>
> Reported-by: Sachin Sant <sach...@linux.vnet.ibm.com>
> Tested-by: Sachin Sant <sach...@linux.vnet.ibm.com>
> Tested-by: Nathan Chancellor <nat...@kernel.org>
> Link:
> https://lore.kernel.org/r/1905cd70-7656-42ae-99e2-a31fc3812...@linux.vnet.ibm.com/
> Signed-off-by: Will Deacon <w...@kernel.org>
> ---
> arch/powerpc/platforms/pseries/svm.c | 6 ++++++
> 1 file changed, 6 insertions(+)
Thanks.
Acked-by: Michael Ellerman <m...@ellerman.id.au>
I assume Konrad will take this via the swiotlb tree?
cheers
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