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s=201909; t=1627903233; bh=Ph52ycwEVB+Kr83e5k5zzEwv6lbCoXALW4ekLWI3mvY=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=OyD8Aq4AaqIcoMdaKfnwOqsE8epJkeGEPf9zJ0mxrHVywJVEKvSUZj+8YoIcH1VE0 honyNi+z9ReapyZ4mk0fGsa4f3+TDmmba0/ty3GP7pNlm6LYVIBMCjhfutrxOxHu8U sXMxTIGfAExBHy4IhWp21JGrCbgJ+3wenHoU1iroNBQ5voTWW6vLvDn8IZF88BqEG1 /H9zBHykLP4zxKizoJFitgHSqjAZTrCPkT/GNtGZIKgGPYlDfFDLg73RL/C+wl4gcp xLa/w0jrpy0Nr/i4gK3JpxGP4X4LK3JHpDAQ4j1a8uYsQjEqJM8BSwqNCeKElZLAQp CCvt/6/jf5VKA== From: Michael Ellerman To: Will Deacon , linux-kernel@vger.kernel.org, Konrad Rzeszutek Wilk Subject: Re: [PATCH] powerpc/svm: Don't issue ultracalls if !mem_encrypt_active() In-Reply-To: <20210730114231.23445-1-will@kernel.org> References: <20210730114231.23445-1-will@kernel.org> Date: Mon, 02 Aug 2021 21:20:30 +1000 Message-ID: <871r7cks8x.fsf@mpe.ellerman.id.au> MIME-Version: 1.0 Cc: Sachin Sant , Will Deacon , linuxppc-dev@lists.ozlabs.org, Nicholas Piggin , Nathan Chancellor , iommu@lists.linux-foundation.org, Claire Chang , Robin Murphy , Christoph Hellwig X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" Will Deacon 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 > Cc: Claire Chang > Cc: Christoph Hellwig > Cc: Robin Murphy > Fixes: ad6c00283163 ("swiotlb: Free tbl memory in swiotlb_exit()") > Suggested-by: Nicholas Piggin > Reported-by: Sachin Sant > Tested-by: Sachin Sant > Tested-by: Nathan Chancellor > Link: https://lore.kernel.org/r/1905CD70-7656-42AE-99E2-A31FC3812EAC@linux.vnet.ibm.com/ > Signed-off-by: Will Deacon > --- > arch/powerpc/platforms/pseries/svm.c | 6 ++++++ > 1 file changed, 6 insertions(+) Thanks. Acked-by: Michael Ellerman I assume Konrad will take this via the swiotlb tree? cheers _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu