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Thu, 30 Jul 2026 12:22:22 +0000 (GMT) Received: from p1lg14886.dc01.its.hpecorp.net (unknown [10.119.18.237]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by p1lg14878.it.hpe.com (Postfix) with ESMTPS id ACA9514785; Thu, 30 Jul 2026 12:22:21 +0000 (UTC) Received: from hpe.com (unknown [16.231.227.39]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature RSA-PSS (2048 bits) server-digest SHA256) (Client did not present a certificate) by p1lg14886.dc01.its.hpecorp.net (Postfix) with ESMTPS id 5C5C8800262; Thu, 30 Jul 2026 12:22:20 +0000 (UTC) Date: Thu, 30 Jul 2026 07:22:18 -0500 From: Dimitri Sivanich To: Muhammad Usama Anjum Cc: Dimitri Sivanich , Arnd Bergmann , Greg Kroah-Hartman , linux-kernel@vger.kernel.org Subject: Re: [PATCH 0/3] misc: sgi-gru: Remove broken page-table walks Message-ID: References: <20260730111316.3672672-1-usama.anjum@arm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260730111316.3672672-1-usama.anjum@arm.com> X-Proofpoint-GUID: pRiijfqGxjmTm5ClPxnivhxJGJxQDDSI X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzMwMDA5MyBTYWx0ZWRfXyClGi7bNAyR2 DjJborEEBnDL9Oi6k4ba21GvFIfID7SHKUp7JBl6253flRK64DfdfNLGg5RgAmcg3F3EGeIhu13 gLE6zywJebzjju0nr5bwT4n8mY5NitwkvK1a8A6TNg++Iwv41smpuiidP7f0nLLK6sojjBF981S b6bMVXQA0xO49lq4T9RG2+ZSmsdhy69AH+trYNpCci7leDgt/8VpGZLTPvQVbG0afFylC4XtQuF E5ac+aAEIFxw2AkvJSMuulttB0D534I8trgtyHf2uhVSIo3UtUKgsJ4cCMRG3QdyDOIXOzjWoZf GAtxkx4SwfAP8sVZm5J5phpqHtClGGzh4VilqPSGWSIEjm/0wQT3Jof2tAaQWTUYl7DJH28dmoy bkSPqBVtdEdwD1kaHbmpDTgKQsuNRYowob7wJkPFa4aKpLP9j1U3mMWBXKYZABZ9CrPMnuWml+C DfhxPMQQ5ZisM5GsibA== X-Authority-Analysis: v=2.4 cv=Pf7PQChd c=1 sm=1 tr=0 ts=6a6b41fe cx=c_pps a=UObrlqRbTUrrdMEdGJ+KZA==:117 a=UObrlqRbTUrrdMEdGJ+KZA==:17 a=kj9zAlcOel0A:10 a=RAioF0-LDSMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=gQcMVamqm3wCPoSYhaRC:22 a=k7r4yCLl9DVLXMiQTbtC:22 a=ZJBz28GlQpidU4OhUyMA:9 a=CjuIK1q_8ugA:10 a=ZXulRonScM0A:10 X-Proofpoint-ORIG-GUID: pRiijfqGxjmTm5ClPxnivhxJGJxQDDSI X-Proofpoint-Spam-Info: AW1haW4tMjYwNzMwMDA5MyBTYWx0ZWRfX/hy6x39b9RRj QJYhaWM4qnR863+gf+gUbTPd4qX3TOxRRPMIC/jshcq4J0iXTsU0axT+W8JF/fdQKoGYZ9FNqlp o1WqYbMbLeC0XqrEr0ZAUJnW7YUVAyQ= X-HPE-SCL: -1 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-30_03,2026-07-29_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 impostorscore=0 phishscore=0 malwarescore=0 spamscore=0 lowpriorityscore=0 clxscore=1011 suspectscore=0 adultscore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607300093 Muhammad, I should let you know that we're currently and actively working on a forthcoming patch to remove the sgi-gru driver, due to security concerns. We hope to submit this patch soon. On Thu, Jul 30, 2026 at 12:12:49PM +0100, Muhammad Usama Anjum wrote: > While working on MM page-table changes, I found that the SGI GRU driver > walks user page tables unsafely from interrupt context. This series > removes that path, uses the existing process-context fallback, and > cleans up the resulting dead code. > > Muhammad Usama Anjum (3): > misc: sgi-gru: remove interrupt-context page-table walks > misc: sgi-gru: remove obsolete atomic fault-handling state > misc: sgi-gru: inline the user CBR status update > > drivers/misc/sgi-gru/grufault.c | 185 +++++++------------------------ > drivers/misc/sgi-gru/gruprocfs.c | 1 - > drivers/misc/sgi-gru/grutables.h | 1 - > 3 files changed, 41 insertions(+), 146 deletions(-) > > -- > 2.47.3