From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.17]) (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 18F931E487 for ; Tue, 3 Mar 2026 00:01:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.17 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772496066; cv=none; b=i7wQFTZY/gXJkvE4m8mECtw7v6Hv3KnrZa8J3UPJkBWlRga5RygNtHogdYRskOP16NGrQb0Gc+C0QVCkrHZ3vvETT2hZeTZyqB1vQOpXyTmbUf3+MDJNBtwURXI1VCRIR5EPsa5T8n2FpiY4s3PBJL0s7sXeHMwUbS2sOMaBdVo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772496066; c=relaxed/simple; bh=o2Zu0c/3hllJMga2T4+P+5Si/OuA2BCSZAXmQcZT9J4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=dM+RmxuA2SfDSGm3LRcP3ju45mnS65mkE4GDN1ivrY4CU29583efzgXUonH24Ep9U4GqB7zlUxJFOOUsrxDu5QEsGvL4qGgqwXg5hsmjELPwD2YvrPVgpQ+BSOCu+QSay0Ur5hX3Lhgcoo9PEDOYRhXSITMRDucQo2p4azYgatg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=ZQPltaAE; arc=none smtp.client-ip=198.175.65.17 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="ZQPltaAE" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1772496065; x=1804032065; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=o2Zu0c/3hllJMga2T4+P+5Si/OuA2BCSZAXmQcZT9J4=; b=ZQPltaAEfrYRSqhuYQzNbb1BeJ25Wy/cuYiYn6rBiosFrW9b5nfzNvE3 J0LU2qnrRvc3NyY0PmRXpFBLhKisMfKqirzy154rDMEEdoyhi6fbJsX58 cT2nqwcGHcmd8z8x/wPoIcE8WO1eBBksYAMkBO0c1/7XsOz6m8zlSm90+ jL4JXXhsaSNdV0iDIJPZiLRc3d7lSHNn4bWcAwTFWcbY0pueNORMKNRa+ 9Q6TWk5m5BntmKQl973c6L3FS6AEiSDGIB72B7B8KMmEIAoxPCA3uLKpq VLpLC5zlkkSoIlgRsBuHi+ysUhC4knopUB8X23pTYYcM55l5I8Pj+Zn0p Q==; X-CSE-ConnectionGUID: IBnd4NMuRXajqjWyk840Dw== X-CSE-MsgGUID: SPGLSu/bQPqzakXXzofBvg== X-IronPort-AV: E=McAfee;i="6800,10657,11717"; a="73482960" X-IronPort-AV: E=Sophos;i="6.21,321,1763452800"; d="scan'208";a="73482960" Received: from fmviesa006.fm.intel.com ([10.60.135.146]) by orvoesa109.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Mar 2026 16:00:58 -0800 X-CSE-ConnectionGUID: wMctE89/TmCkDvvyaCbuOw== X-CSE-MsgGUID: n7/6zYUVSJKHn3etPd/d/Q== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.21,321,1763452800"; d="scan'208";a="214967112" Received: from dwillia2-desk.jf.intel.com ([10.88.27.145]) by fmviesa006.fm.intel.com with ESMTP; 02 Mar 2026 16:00:57 -0800 From: Dan Williams To: linux-coco@lists.linux.dev, linux-pci@vger.kernel.org Cc: gregkh@linuxfoundation.org, aik@amd.com, aneesh.kumar@kernel.org, yilun.xu@linux.intel.com, bhelgaas@google.com, alistair23@gmail.com, lukas@wunner.de, jgg@nvidia.com, Dave Hansen , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" Subject: [PATCH v2 11/19] x86, dma: Allow accepted devices to map private memory Date: Mon, 2 Mar 2026 16:01:59 -0800 Message-ID: <20260303000207.1836586-12-dan.j.williams@intel.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260303000207.1836586-1-dan.j.williams@intel.com> References: <20260303000207.1836586-1-dan.j.williams@intel.com> Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit With the arrival of "accepted" devices, devices that have been enabled to DMA to private encrypted memory, coherent DMA allocation no longer requires page conversion. Update force_dma_unencrypted() to skip accepted devices. Cc: Dave Hansen Cc: Andy Lutomirski Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: x86@kernel.org Cc: "H. Peter Anvin" Signed-off-by: Dan Williams --- arch/x86/mm/mem_encrypt.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/arch/x86/mm/mem_encrypt.c b/arch/x86/mm/mem_encrypt.c index 95bae74fdab2..6d2972ff6ed8 100644 --- a/arch/x86/mm/mem_encrypt.c +++ b/arch/x86/mm/mem_encrypt.c @@ -20,10 +20,11 @@ bool force_dma_unencrypted(struct device *dev) { /* - * For SEV, all DMA must be to unencrypted addresses. + * Require unencrypted DMA unless the device has been "accepted", + * enabled by a TSM driver to DMA to private encrypted memory. */ if (cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT)) - return true; + return !device_cc_accepted(dev); /* * For SME, all DMA must be to unencrypted addresses if the -- 2.52.0