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Commitad6c002831("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.wilk@oracle.com> Cc: Claire Chang <tientzu@chromium.org> Cc: Christoph Hellwig <hch@lst.de> Cc: Robin Murphy <robin.murphy@arm.com> Fixes:ad6c002831("swiotlb: Free tbl memory in swiotlb_exit()") Suggested-by: Nicholas Piggin <npiggin@gmail.com> Reported-by: Sachin Sant <sachinp@linux.vnet.ibm.com> Tested-by: Sachin Sant <sachinp@linux.vnet.ibm.com> Tested-by: Nathan Chancellor <nathan@kernel.org> Link: https://lore.kernel.org/r/1905CD70-7656-42AE-99E2-A31FC3812EAC@linux.vnet.ibm.com/ Signed-off-by: Will Deacon <will@kernel.org> Signed-off-by: Konrad Rzeszutek Wilk <konrad@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.