From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 2DBA726A08F for ; Wed, 29 Jul 2026 10:37:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785321444; cv=none; b=bZZHokjGrotyd+2QS4Y7vp9ltJWvscO4Ts7A1FEZsqo6G8IQWl7sLaM2rUHtJLAfjOvHbOd8dKuiavx+kuygMiryjKux8Cw2JYon6k4L662yntt12r6DCCXpGgjWoQis6yUe2YkVOIhDwOYR1aK148fT9or1ps+582YrCHn+2e4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785321444; c=relaxed/simple; bh=6n9MIhqkBghDtpplarraCimcBnnx7oz7eCtjmQBMUSs=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=F1QxDoXnNWQLWIwpynU6MyHpXMLDZrP5TdJKlodKHwTVjQ+9XN4F01UBlvYPh2sjz1+185SnPiK1keeAuAcEOgQ3F7xMuqo5LGIGiTY3ZyGDkitbiTk6ujU8lJxSCLk7ont3tcxIFMvj42q+I2bSnxnTj7TCam4xxZkAzcCCuTw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=jdJRTaby; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="jdJRTaby" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 564671F000E9; Wed, 29 Jul 2026 10:37:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1785321442; bh=Y+a8IfSEDpqZJC7Z9rNoD+ttzBICshMrN3p8r998ojw=; h=Subject:To:Cc:From:Date; b=jdJRTaby6EEf3yV/DiRTrSJ60vFWCcrMRLds9v3kHfDrTBp7eiam/BGrnIcVAAf1q HV6YF+qc5RhjOexajMfgnV5ZXYfgWd2+fWY8XOBzEScfd45Q0bIt9kl2Ub+hpmlh8F hfNrEpll8c+uvcuixPoUFJd3wq43/W5xkgz15FoM= Subject: FAILED: patch "[PATCH] drm/xe/uapi: Reject coh_none PAT index for CPU_ADDR_MIRROR" failed to apply to 7.1-stable tree To: jia.yao@intel.com,alwin.mathew@intel.com,matthew.auld@intel.com,matthew.brost@intel.com,michal.mrozek@intel.com,shuicheng.lin@intel.com,stable@vger.kernel.org Cc: From: Date: Wed, 29 Jul 2026 12:37:09 +0200 Message-ID: <2026072909-boil-smartness-3be9@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit The patch below does not apply to the 7.1-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-7.1.y git checkout FETCH_HEAD git cherry-pick -x 4d58d7535e826a3175527b6174502f0db319d7f6 # git commit -s git send-email --to '' --in-reply-to '2026072909-boil-smartness-3be9@gregkh' --subject-prefix 'PATCH 7.1.y' 'HEAD^..' Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 4d58d7535e826a3175527b6174502f0db319d7f6 Mon Sep 17 00:00:00 2001 From: Jia Yao Date: Fri, 17 Apr 2026 05:59:17 +0000 Subject: [PATCH] drm/xe/uapi: Reject coh_none PAT index for CPU_ADDR_MIRROR Add validation in xe_vm_bind_ioctl() to reject PAT indices with XE_COH_NONE coherency mode when used with DRM_XE_VM_BIND_FLAG_CPU_ADDR_MIRROR. CPU address mirror mappings use system memory that is CPU cached, which makes them incompatible with COH_NONE PAT indices. Allowing COH_NONE with CPU cached buffers is a security risk, as the GPU may bypass CPU caches and read stale sensitive data from DRAM. Although CPU_ADDR_MIRROR does not create an immediate mapping, the backing system memory is still CPU cached. Apply the same PAT coherency restrictions as DRM_XE_VM_BIND_OP_MAP_USERPTR. v2: - Correct fix tag v6: - No change v7: - Correct fix tag v8: - Rebase v9: - Limit the restrictions to iGPU v10: - Just add the iGPU logic but keep dGPU logic Fixes: b43e864af0d4 ("drm/xe/uapi: Add DRM_XE_VM_BIND_FLAG_CPU_ADDR_MIRROR") Cc: # v6.15+ Cc: Shuicheng Lin Cc: Mathew Alwin Cc: Michal Mrozek Cc: Matthew Brost Cc: Matthew Auld Signed-off-by: Jia Yao Reviewed-by: Matthew Auld Acked-by: Michal Mrozek Signed-off-by: Matthew Auld Link: https://patch.msgid.link/20260417055917.2027459-3-jia.yao@intel.com diff --git a/drivers/gpu/drm/xe/xe_vm.c b/drivers/gpu/drm/xe/xe_vm.c index 5f4220125c76..c3836f6eab35 100644 --- a/drivers/gpu/drm/xe/xe_vm.c +++ b/drivers/gpu/drm/xe/xe_vm.c @@ -3658,6 +3658,8 @@ static int vm_bind_ioctl_check_args(struct xe_device *xe, struct xe_vm *vm, op == DRM_XE_VM_BIND_OP_MAP_USERPTR) || XE_IOCTL_DBG(xe, coh_mode == XE_COH_NONE && op == DRM_XE_VM_BIND_OP_MAP_USERPTR) || + XE_IOCTL_DBG(xe, !IS_DGFX(xe) && coh_mode == XE_COH_NONE && + is_cpu_addr_mirror) || XE_IOCTL_DBG(xe, xe_device_is_l2_flush_optimized(xe) && (op == DRM_XE_VM_BIND_OP_MAP_USERPTR || is_cpu_addr_mirror) &&