Will Deacon <[email protected]> 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 <[email protected]> > Cc: Claire Chang <[email protected]> > Cc: Christoph Hellwig <[email protected]> > Cc: Robin Murphy <[email protected]> > Fixes: ad6c00283163 ("swiotlb: Free tbl memory in swiotlb_exit()") > Suggested-by: Nicholas Piggin <[email protected]> > Reported-by: Sachin Sant <[email protected]> > Tested-by: Sachin Sant <[email protected]> > Tested-by: Nathan Chancellor <[email protected]> > Link: > https://lore.kernel.org/r/[email protected]/ > Signed-off-by: Will Deacon <[email protected]> > --- > arch/powerpc/platforms/pseries/svm.c | 6 ++++++ > 1 file changed, 6 insertions(+)
Thanks. Acked-by: Michael Ellerman <[email protected]> I assume Konrad will take this via the swiotlb tree? cheers _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
