From nobody Sat Feb 7 11:04:57 2026 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.20]) (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 8707D27A108 for ; Thu, 18 Sep 2025 05:04:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.20 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758171852; cv=none; b=QAKgRiq3mzUY84TMs70Z+E9sz00JD5WbNliXFnloBFln3DtCTnMK+OOAuamhZ0E6/gl+vNcqHmTdnVHwV4iXW1j/ruTgcuggIfRLKUc5PQtuk7FOoebnpE8PDoQ6Hw73B6hx53kFKYK9CzF0a272yLcC/Lohf/35j2qHTEHxQmo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758171852; c=relaxed/simple; bh=Zu5AnuoxLCmHJOACwOEU2451ClLNd6bkHUbQEk2MCqo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=BmODd1G05rM0KaG0PFSypzXSMuEdKAW8i0XebZfWYACPSu4c1zs4VtCZGkSWJlRC7SYS+3RVL13lnDyNHvx6E0xFjqOozzvT+bdpZ4BDAMMH8aumBxx2KzFRrtj3G3BNst4w5Dw7wgolOFH0tnopMz9RIihoBpE4Pp8PB4GtykI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=none smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=fpVHigV/; arc=none smtp.client-ip=198.175.65.20 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="fpVHigV/" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1758171850; x=1789707850; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=Zu5AnuoxLCmHJOACwOEU2451ClLNd6bkHUbQEk2MCqo=; b=fpVHigV/UptesdtMDWz7nS4XI8oDPshW3DBr56WZJpToes07CSV0Co+0 UmhbPPsQx0Gvn5AW2zO1UzpS15BuDLPCyAvlQ+kCq90ofi+mmwYPHmEdv 59xdGAVl4F2yEUvF8UZoxf8Zc/oXOHduP+JApayZgTkVdzZ/Vkxt+uuyo o0HWql9TQcrwaw20r+aqYD6W+GcN7BI7uj7iHb8LhYwW1Bs6jd+nYz2eP 6bxYrXjPjGgbsSIwl4/nDLoTZ0ASWKcZmOItW/M8agh9mw1QUxUqLa3wh XggMQbS+OaxJrINsT2Qt3HlWVenkaDwgoPwh4GfEowlYeHdXXt6wK4thN g==; X-CSE-ConnectionGUID: 9+SCZL33SC+DyEOn0d1JdA== X-CSE-MsgGUID: JWjgwqZbTQu9ZOjocHsgLQ== X-IronPort-AV: E=McAfee;i="6800,10657,11556"; a="60182275" X-IronPort-AV: E=Sophos;i="6.18,274,1751266800"; d="scan'208";a="60182275" Received: from fmviesa006.fm.intel.com ([10.60.135.146]) by orvoesa112.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Sep 2025 22:04:10 -0700 X-CSE-ConnectionGUID: lVPoDScTSzio531Pl0nI4A== X-CSE-MsgGUID: 97WaycxmQGycBcbYMS6prw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.18,274,1751266800"; d="scan'208";a="175353411" Received: from allen-box.sh.intel.com ([10.239.159.52]) by fmviesa006.fm.intel.com with ESMTP; 17 Sep 2025 22:04:09 -0700 From: Lu Baolu To: Joerg Roedel Cc: iommu@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH 7/7] iommu/vt-d: debugfs: Avoid dumping context command register Date: Thu, 18 Sep 2025 13:02:04 +0800 Message-ID: <20250918050204.359508-8-baolu.lu@linux.intel.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250918050204.359508-1-baolu.lu@linux.intel.com> References: <20250918050204.359508-1-baolu.lu@linux.intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The register-based cache invalidation interface is in the process of being replaced by the queued invalidation interface. The VT-d architecture allows hardware implementations with a queued invalidation interface to not implement the registers used for cache invalidation. Currently, the debugfs interface dumps the Context Command Register unconditionally, which is not reasonable. Remove it to avoid potential access to non-present registers. Signed-off-by: Lu Baolu Link: https://lore.kernel.org/r/20250917025051.143853-1-baolu.lu@linux.inte= l.com --- drivers/iommu/intel/debugfs.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/iommu/intel/debugfs.c b/drivers/iommu/intel/debugfs.c index 765edb3740e2..617fd81a80f0 100644 --- a/drivers/iommu/intel/debugfs.c +++ b/drivers/iommu/intel/debugfs.c @@ -62,7 +62,6 @@ static const struct iommu_regset iommu_regs_64[] =3D { IOMMU_REGSET_ENTRY(CAP), IOMMU_REGSET_ENTRY(ECAP), IOMMU_REGSET_ENTRY(RTADDR), - IOMMU_REGSET_ENTRY(CCMD), IOMMU_REGSET_ENTRY(PHMBASE), IOMMU_REGSET_ENTRY(PHMLIMIT), IOMMU_REGSET_ENTRY(IQH), --=20 2.43.0