From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0587B37F738 for ; Wed, 30 Sep 2026 16:06:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.180.131 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790784396; cv=none; b=fYNbGxmnkmNMXGSZufQjZHxNouBbo2qkCzAmMppPrno7cdDftpDb0b2IX4cBAhB/oGgqWyHNAgi7xBXPpEOWlKp6xUhXhnhwaSElqtjKeDOi5qNnOznC3xIXUkNw9RnIIPNoWj9e2Ff56jMhS3YixAm9e0JVX8Tp4L7uweiv8Ww= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790784396; c=relaxed/simple; bh=M3mU235Be7SmeB5TrecbBlDrIaYaw+U/+jYODikK3Xs=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=nUcKhj5sY29kpSiwkR1vGPCyr1VZs1Ndtii/iQg3xEDO+RZlU0Yl17933EC28x83LXOEbF/EP2TP1KA0Q9Af0Xc52YCbZJDXH5/YKC04X9DCZ/zmrQvdotQsj0evdLJ1pTxcNAYiODaj6nCvn4BRyi9/GRUHFcJfuJ0BeoEEIVo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oss.qualcomm.com; spf=pass smtp.mailfrom=oss.qualcomm.com; dkim=pass (2048-bit key) header.d=qualcomm.com header.i=@qualcomm.com header.b=GrzS+zys; dkim=pass (2048-bit key) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com header.b=F9bYqaL+; arc=none smtp.client-ip=205.220.180.131 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oss.qualcomm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=oss.qualcomm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=qualcomm.com header.i=@qualcomm.com header.b="GrzS+zys"; dkim=pass (2048-bit key) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com header.b="F9bYqaL+" Received: from pps.filterd (m0279870.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 68UE04Ks3942333 for ; Wed, 30 Sep 2026 16:06:29 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=qualcomm.com; h= cc:content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=qcppdkim1; bh= RJsMX2lmV5ZOu0OhhWQETYgs9bQFhObUxVjX+YGHGYY=; b=GrzS+zys6kCaaQuR hoYYKt3vxHvQAsVUc8sd7nR5DNlwNVQ/udeLha/y7PBdkrOan6v5ddR1cVm9uk4/ QenhZMPEoE+sSrea/Xf7uz3u6zQZ+zmLeh8yOeFhXcYjex23pw7gf/YsduLeNbCN 36DYaVdtCJXpvAp18lcvQWydfUe+3VFOhZ3fIt4dQjTqmVfwn+pRr4uBO9A9ajib Jn5mjjn2PImG2IOXGizFtK9L0rmR07DJB4QON5XZumW/LopQArDtELJI51GS+wKz eSCMFF5usimEHanL4mpYFl4PXD20XyLB+Sdv54i+20Pfb7rnXm/U2plXKUzH1a55 zkI1Iw== Received: from mail-dy1-f199.google.com (mail-dy1-f199.google.com [74.125.82.199]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 4h10bk9jhp-1 (version=TLSv1.3 cipher=TLS_AES_128_GCM_SHA256 bits=128 verify=NOT) for ; Wed, 30 Sep 2026 16:06:29 +0000 (GMT) Received: by mail-dy1-f199.google.com with SMTP id 5a478bee46e88-34d62bb27a1so1229542eec.0 for ; Wed, 30 Sep 2026 09:06:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oss.qualcomm.com; s=google; t=1790784388; x=1791389188; darn=lists.linux.dev; h=content-transfer-encoding:content-type:mime-version:organization :references:in-reply-to:message-id:subject:cc:to:from:date:from:to :cc:subject:date:message-id:reply-to:content-type; bh=RJsMX2lmV5ZOu0OhhWQETYgs9bQFhObUxVjX+YGHGYY=; b=F9bYqaL+EUZE/P+5s2qoc2/tprKr6E1/4Y1INGIKE45SgVijyXMlbaLq/Y6JhSwI3q 2FwG4fDG9LEDkH/Q73FCHNbXBweB3c/vh0fEkD0vdQuyAAqa01rXvFI/G1GJV5vJQp8g HETR4Z6tsph7QlfH8OcOw4JPi7H7Z7QsNXSFiMTOKIp53jaowWp7Mhq6D7U2gqHvz9Gj GA34Tn5/Q9DczQBKUwk+jxjVbtBWoVOb6+NvZNIFCfg2VIOPb1xuFi6cgpxypWAhvQTl 7txFWOd3tqj6+Bow6S9bVy3zB6GAwXsFOKxc/rRRkKBFU3LzVKiuhLOnxyUyLVd48vbv MlXw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1790784388; x=1791389188; h=content-transfer-encoding:content-type:mime-version:organization :references:in-reply-to:message-id:subject:cc:to:from:date:x-gm-gg :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=RJsMX2lmV5ZOu0OhhWQETYgs9bQFhObUxVjX+YGHGYY=; b=BKZKJioQZniPo6G5RfAT+Ej78KpLfiXeXAbcAOd3nR66wFCqGDuoHkvQH53AJ1tsr1 c5CayhExWNN/ZoE1eJApKrtqwl5tMtfNPgb/NXxgAuWbIeieODp/simZIxXU+lB26otn QleCTr0lK40MJjLOcQ84PhkKFux5UnJQkugmENYC//jUCMcqoS64MpsLl48hvhu7elyN IFONM0ep0Y9SkdxKRJo8I7Yd7/SyylaEeqOrlqP8+u/lsQWPVu5Zik7a82e/lZMork4j x7/SYZfg3qXSVYuBI/GWb9m5AlF2UFMhgqvVlZAJ6yEWKbiXwpmydRvZ4Om1kYopGKr7 eraA== X-Forwarded-Encrypted: i=1; AKwUvBx5ILGH/geQ12IkAnemy4JsdGBuv2rJ1U4cmy3p/Gdtini1Y5vsCupcf+60KkAVyXPYUWEQ86wzZbTv@lists.linux.dev X-Gm-Message-State: AFq9FYLitYgQn/Obi3ZV1mwLtuAJBEd+RBLxTIAlqrwZkqYbkf+a51F0 /UakH0MA8k8FDM/ZCAPrbT7PKmResFGKEOkanIW9gxYfrxJQ9pbIN7imFmEROoK2c8VVu7UaEao U8hbQqBEJ2kiHk3PRcmfDhllimZL6DHth94pi8hdAlS33wKBMBIYBWipohYKS0bA6 X-Gm-Gg: AYBFou0mFUfxN4H3GQ/0f+uArfr0ygWngm8KYM3jwmguvl0f+yHDIkQVht+819ircxK P6L8PksSR2DKuZykomG6qVmkFD1fKVHL1LoiXMqsfUPzHSlssGJFTPeq/Za6cnREc/jMxZHa3Ix 7epm37OzmzFkLP6oGBao1Jk2JnYSVYd+rkJsaRUmZJgYHYl25Az8wM3PhUGkSQL4hZIa6+bvynf INuzmSJLjjYW2ogiqH+SWNJuAcIfjKhUBgtztpHBc1+1UIuPgvyTufICuScyByi7rXVj1HiFbuM 34QZdSYoxndO2T0lPPnpcZ+hPlBIaYTv0QMPZ8Puz9JsZ4vxo3rUlFSyPRGt2GVzS4a9zMjE9xE R/96+6LfaeTvSucHJUKowOdoQOHtKoWpSiDbBsK4HZeYPVM/PIOt8/w== X-Received: by 2002:a05:7300:f791:b0:34c:5283:4f07 with SMTP id 5a478bee46e88-34cdd792968mr2177201eec.38.1790784388277; Wed, 30 Sep 2026 09:06:28 -0700 (PDT) X-Received: by 2002:a05:7300:f791:b0:34c:5283:4f07 with SMTP id 5a478bee46e88-34cdd792968mr2177166eec.38.1790784387688; Wed, 30 Sep 2026 09:06:27 -0700 (PDT) Received: from localhost (i-global254.qualcomm.com. [199.106.103.254]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-34db0c8e76esm167595eec.4.2026.09.30.09.06.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 30 Sep 2026 09:06:27 -0700 (PDT) Date: Wed, 30 Sep 2026 09:06:22 -0700 From: Jonathan Cameron To: Suzuki K Poulose Cc: kvm@vger.kernel.org, kvmarm@lists.linux.dev, maz@kernel.org, will@kernel.org, catalin.marinas@arm.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, steven.price@arm.com, aneesh.kumar@kernel.org, oupton@kernel.org, gshan@redhat.com, joey.gouly@arm.com, tabba@google.com, yuzenghui@huawei.com, linux-coco@lists.linux.dev, gankulkarni@os.amperecomputing.com, sdonthineni@nvidia.com, alpergun@google.com, fj0570is@fujitsu.com, WeiLin.Chang@arm.com, lpieralisi@kernel.org, enju.kohei@fujitsu.com, sudeep.holla@arm.com Subject: Re: [PATCH v20 7/9] arm64: Block hibernate and kexec while RMM is active Message-ID: <20260930090622.00006590@oss.qualcomm.com> In-Reply-To: <20260929221623.1342076-8-suzuki.poulose@arm.com> References: <20260929221623.1342076-1-suzuki.poulose@arm.com> <20260929221623.1342076-8-suzuki.poulose@arm.com> Organization: Qualcomm X-Mailer: Claws Mail 4.4.0 (GTK 3.24.51; x86_64-w64-mingw32) Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Proofpoint-GUID: GtQ1h04b4KRlEqZNL6gVMZPipc4aL_aA X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTMwMDA2NCBTYWx0ZWRfX0797K7uDVny4 XCbz4ZlTdIo08q7Q7ZMIlWsbPJ4/g70fT493WHWm88gXTCk4uIkEiRJ+nwAvlhODS4WrvE02pJL 1dMv1xyO/EnRJHTGvAlrzTh2r9pExbzsqgWL7PIDYekztQPGE9VCgFCACb2LIDG7lGTZXLBu72Q 4RhPxrEuoqjKYnnRVIxZpIin8xVNHpKPnDDF9kK9x3P7IGZExwuYZKmGktcqbh1yMW8sTrstF90 hlyh+W2HK8hrzqpbe3gtm+eCaA9xV4OQY3ILmK6P8bdVUOFEGq6FwQgfAAXgvEhb7bfHaHBZI4e oD+Czmh5aFnEgdHvIPMh5o9DgQsKY2rRCx25mcEJwN9a29tcOQ947KusO/SebVyzO/OIVlB4kix JxHvOHZT8bUXEpN/MImjwik8oeBFgU/j+kzf80dVWibe+Sw+fgZnFG+iFUkpwI2L20uZkYlIzmb CQYJvyqKTRSJm6PFj5w== X-Authority-Analysis: v=2.4 cv=MZn5KJ/f c=1 sm=1 tr=0 ts=6abd3385 cx=c_pps a=cFYjgdjTJScbgFmBucgdfQ==:117 a=JYp8KDb2vCoCEuGobkYCKw==:17 a=kj9zAlcOel0A:10 a=VdqzKS8jKosA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=gowsoOTTUOVcmtlkKump:22 a=7CQSdrXTAAAA:8 a=EUspDBNiAAAA:8 a=LZvgd7wXd7bcPLl1K1UA:9 a=CjuIK1q_8ugA:10 a=scEy_gLbYbu1JhEsrz4S:22 a=a-qgeE7W1pNrGK8U0ZQC:22 X-Proofpoint-Spam-Info: AW1haW4tMjYwOTMwMDA2NCBTYWx0ZWRfXzEqSFE3LNgKp weaVcxUR4b1JHXfZhybNDZIzDndeZvX65pviHxbb7Its4N8vGiLMdHjjTnbfMYCP5JeOSTL8m5x 7Anu5FTb1w1GkrF9n6043EtSx/BLo+U= X-Proofpoint-ORIG-GUID: GtQ1h04b4KRlEqZNL6gVMZPipc4aL_aA X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-30_03,2026-09-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 lowpriorityscore=0 spamscore=0 suspectscore=0 priorityscore=1501 bulkscore=0 clxscore=1015 impostorscore=0 adultscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609300064 On Tue, 29 Sep 2026 23:16:21 +0100 Suzuki K Poulose wrote: > RMM can be deactivated only after all delegated granules have been > reclaimed. If a new kernel is entered while any granules remain in the > Realm PAS, accesses to that memory can raise a Granule Protection Fault > and be fatal to the new kernel. > > Crash kexec/kdump needs separate handling. It can be supported only once > the crash kernel can tolerate delegated memory inherited from the primary > kernel. i.e., be able to read the pages safely and fixup the GPF. Until > then disable the kexec completely. > > Hibernate has a similar problem. The image cannot be safely saved for > delegated pages, as the RMM doesn't support exporting the pages. > > Disable both kexec and hiberation while the RMM is active. > > Signed-off-by: Suzuki K Poulose Not my area of expertise but follows similar patterns to blocking these for other reasons. Reviewed-by: Jonathan Cameron