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 7B7BA40A924 for ; Wed, 29 Jul 2026 10:37:31 +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=1785321452; cv=none; b=DbDSIHtjOYOp64EFEAyQb2H5J7ziSZ9XZlgoiin/ZYOHBuYa2Yk/Y34kUXwzuNMYYpa6xd9+miLpDUU7HcE8QYV/JfXHBEZCIPw0iV1s2XM/+/Cn/S9Aj6waaKRcFeg8Myjumixz1Gn6YzFkMjIv/aeU0nxmwO9Dndy1zzkd50U= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785321452; c=relaxed/simple; bh=c8Ykda+HMyQJsQbTM5wHBxotouifqN3SFR755p++weU=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=EwMGeoBR2wyj2MPdMVOk0i01dl3DvsMJujPyp/EJvL5HPwxkY+2kFOKAYL78uaCFYFJhaQpqkXDFsT+bZa1o+eVSsxNrJcsqOci8n39bgJDXa5ukpXs2iUo9IuO9L90uYZogyhOdr+d14RVf0eUnsMgow1Ymcgq1ZkU8bzcdiHM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=pHmalEeE; 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="pHmalEeE" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CC7401F000E9; Wed, 29 Jul 2026 10:37:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1785321451; bh=DghgyndknaQb5GY9l8fkJURZyRoyFiYOeAIcUfe5yG0=; h=Subject:To:Cc:From:Date; b=pHmalEeE1sP8d04jAgJWWt1z2aWIUwksLxGFtqWZ56uvnu0Z2Tqj2WsoF4fkhgV9f FTBXUfjUVbVJUYplrbPCCofnqkp/9r+P76mPrWhf17oIOpr9SHWKgVYJ+/nImEun2h Utef9O+6lzKtOFE6xO6J/lUZpt7WvEuaLSxhNEyI= Subject: FAILED: patch "[PATCH] drm/xe/uapi: Reject coh_none PAT index for CPU_ADDR_MIRROR" failed to apply to 6.18-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 12:37:10 +0200 Message-ID: <2026072910-darkroom-avenue-7ff8@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 6.18-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-6.18.y git checkout FETCH_HEAD git cherry-pick -x 4d58d7535e826a3175527b6174502f0db319d7f6 # git commit -s git send-email --to '' --in-reply-to '2026072910-darkroom-avenue-7ff8@gregkh' --subject-prefix 'PATCH 6.18.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) &&