From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 991A1CD6E7B for ; Sat, 6 Jun 2026 00:35:27 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [127.0.0.1]) by lists.ozlabs.org (Postfix) with ESMTP id 4gXK8Y6d6Wz2yMn; Sat, 06 Jun 2026 10:35:25 +1000 (AEST) Authentication-Results: lists.ozlabs.org; arc=none smtp.remote-ip=148.163.158.5 ARC-Seal: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1780706125; cv=none; b=iZt7+YEpIzYYtXSgYnfOew05HU0rlfDdm/+M3DN0e1mPpcVL8Q2QKGkKkLjYwfY7tCVk1EK/yu1mbGmk/d4zvMmRR72tiVXz1m7J0BDHbbjXoIiq41kxlG7umv6+B4rValSQ6TPPjPFVYuTscwsSbKVeIEobIXNIzHgEmE72SppDt63WqTB7E2+23bd6R5cLDF+4bbC9QBjW1LvWMD+uf4oEvDFA/3uXOukYiiZ3KE6P3IoJf67+1Ya+0cIhR55O+GBbyJyQHBblW/weIhzAG5OES0bqji3ozkTyQQMCXRNeiwfiN+j4MIcHGRQFFn9puNe5bykoiv0aGC7xMGd8Ww== ARC-Message-Signature: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1780706125; c=relaxed/relaxed; bh=10R7bpEJTdOdzVayFD9Q6l+SCZSwLyUlb7ZztL7dxms=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=BHK1+rhS9EImEJr0XSjIalDOuyOXy4H15kkO6O6lZ2QKSI3qBtKmEVSSZRJALo7HWpg6ZaO9r0/NnjJJY02PquJrJ4T2CC+VAdCAPCAG/tLIWDylFi/jwGPbVqcLrsZ2X5gsAY6LVE24yAM7BDdZKGLBmUb5XDIXmo9Y+Td+5jwlKmr2GKngnurQm9YG2HvK9xIYJlyYKL0BcJwG2/Bzz24KPywkiDs2EsBMzT5SpdAKc+RPn2g7l8LYME/puoOA39ai8s4IA6Ck+n1YmT9eQBjRVSV5p8erCDVBqb5MSOkdR5QEkht6nHtZ5LJGEk8+ZVbIA6OO2wKWdB00vyEOSg== ARC-Authentication-Results: i=1; lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com; dkim=pass (2048-bit key; unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=RoUHrZSB; dkim-atps=neutral; spf=pass (client-ip=148.163.158.5; helo=mx0b-001b2d01.pphosted.com; envelope-from=jhkim@linux.ibm.com; receiver=lists.ozlabs.org) smtp.mailfrom=linux.ibm.com Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=RoUHrZSB; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=linux.ibm.com (client-ip=148.163.158.5; helo=mx0b-001b2d01.pphosted.com; envelope-from=jhkim@linux.ibm.com; receiver=lists.ozlabs.org) Received: from mx0b-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange x25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4gXK8Y08BNz2xMW for ; Sat, 06 Jun 2026 10:35:24 +1000 (AEST) Received: from pps.filterd (m0353725.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 655KPGLH3165334; Sat, 6 Jun 2026 00:34:50 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc :content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=pp1; bh=10R7bp EJTdOdzVayFD9Q6l+SCZSwLyUlb7ZztL7dxms=; b=RoUHrZSBgzuGWiJYOobbkB /uQkABo/YV4/wSRYGiwn9Ynd3JL66r4IQeDQvzBMEgK3kIX0ZxDPjx2aNkSaTOVs gTquWUfkdJp4D41f8WqPwCGXecmnbTJYjOSAkisQRTD5eWdvIlADCk0h+ymg9sqe ytafL6jBkxQn3Y+qxgVP9e42FMaX1eCiCBRPx1sy0V7uItqD3CJWavhEiEclAYIN 4+mS9hCXrkzBjH0VZP3xbY4y4HCfp9bXE2sYFBWify0bxsKhFP/TJoNtj1tuq+VE 4ytyKsZpXDnSEN1FkNsq/pCg6+k3ih0UWLoz7Bz8L5CZGjM0/fACZpgM+qBmTn5w == Received: from ppma12.dal12v.mail.ibm.com (dc.9e.1632.ip4.static.sl-reverse.com [50.22.158.220]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 4efpaep0sr-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sat, 06 Jun 2026 00:34:49 +0000 (GMT) Received: from pps.filterd (ppma12.dal12v.mail.ibm.com [127.0.0.1]) by ppma12.dal12v.mail.ibm.com (8.18.1.7/8.18.1.7) with ESMTP id 6560O6gk027834; Sat, 6 Jun 2026 00:34:48 GMT Received: from smtprelay05.dal12v.mail.ibm.com ([172.16.1.7]) by ppma12.dal12v.mail.ibm.com (PPS) with ESMTPS id 4ega7qv6fn-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sat, 06 Jun 2026 00:34:48 +0000 (GMT) Received: from smtpav01.wdc07v.mail.ibm.com (smtpav01.wdc07v.mail.ibm.com [10.39.53.228]) by smtprelay05.dal12v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 6560YlZk30933536 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sat, 6 Jun 2026 00:34:47 GMT Received: from smtpav01.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B8FA95804B; Sat, 6 Jun 2026 00:34:46 +0000 (GMT) Received: from smtpav01.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 147E058063; Sat, 6 Jun 2026 00:34:45 +0000 (GMT) Received: from [9.61.255.106] (unknown [9.61.255.106]) by smtpav01.wdc07v.mail.ibm.com (Postfix) with ESMTP; Sat, 6 Jun 2026 00:34:44 +0000 (GMT) Message-ID: Date: Fri, 5 Jun 2026 19:34:43 -0500 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 01/20] s390: Expose protected virtualization through cc_platform_has() To: "Aneesh Kumar K.V (Arm)" , iommu@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-coco@lists.linux.dev Cc: Robin Murphy , Marek Szyprowski , Will Deacon , Marc Zyngier , Steven Price , Suzuki K Poulose , Catalin Marinas , Jiri Pirko , Jason Gunthorpe , Mostafa Saleh , Petr Tesarik , Alexey Kardashevskiy , Dan Williams , Xu Yilun , linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , "Christophe Leroy (CS GROUP)" , Alexander Gordeev , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , Sven Schnelle , x86@kernel.org, Halil Pasic , Matthew Rosato References: <20260604083959.1265923-1-aneesh.kumar@kernel.org> <20260604083959.1265923-2-aneesh.kumar@kernel.org> Content-Language: en-US From: JAEHOON KIM In-Reply-To: <20260604083959.1265923-2-aneesh.kumar@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Authority-Analysis: v=2.4 cv=Zt3d7d7G c=1 sm=1 tr=0 ts=6a236b29 cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=IkcTkHD0fZMA:10 a=FelO9ux0wxsA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=blRdvrxeXnuE--CKtYQA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-GUID: ggpQfBSPHMe1E8vMi3W1YAcBxeGqHkU7 X-Proofpoint-ORIG-GUID: R-cCnVSeKSEuXI4kZncs7oFO8xtbizvI X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNjA1MDIzOCBTYWx0ZWRfX9CWxwkp73QOf ZCH4PcwFj7hkSywfl53gPqnUYZONt+fisFvoWdZOYTyT/hiKmJ9eU+cj3qU6bOdD1JUJjUTnFwa ucoZ3M+XIX/H7cgV5kPBdBK5BaKIZSeRJbxRpdepy5t8VxGknQ853KyhwMtTE/YQ2FN+AFuAGWL d9i4B/tfPrel1DUWKv+3FV71IZJI4IX6EyXoSz/8AnFWX1hASHDLUA/+OpTgKTnZkjMBBvWY4az ooWmu/2NwO95b7RZWbB5O/Pj1qgGuwwJZtlZkf6UxLW9lLcU9vvHHM201Mu0ZikAVCd0fMGCHHp 9ns2dJJMnWbtvb2lhH1iR2pZGU73I+zgWWuTpgupFrYDkoYrbQCdgou2J4ENmDyinF5Jimv+1Yl JX76uXu3wzudOrj/Ql4gsBnWAA+lAuSIXm00ffyXp7fu1ZI0zbiwzHJS/MepnwU8HYqA7viDiba mDkSbz2OSX92hxN+c4w== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-06-05_05,2026-06-05_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 suspectscore=0 priorityscore=1501 bulkscore=0 clxscore=1015 phishscore=0 spamscore=0 malwarescore=0 adultscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605210000 definitions=main-2606050238 On 6/4/2026 3:39 AM, Aneesh Kumar K.V (Arm) wrote: > Protected virtualization guests use memory encryption, so advertise that to > the rest of the kernel through cc_platform_has(CC_ATTR_MEM_ENCRYPT). > > s390 already forces DMA mappings to be unencrypted for protected > virtualization guests through force_dma_unencrypted(). Add > ARCH_HAS_CC_PLATFORM and provide the matching cc_platform_has() > implementation > > Signed-off-by: Aneesh Kumar K.V (Arm) Tested-by: Jaehoon Kim Tested on s390 PV guest with swiotlb_dynamic configuration. SWIOTLB bounce buffer allocation and dynamic pool management work correctly. Also concurrent I/O stress completed successfully. Thanks, Jaehoon. > --- > Cc: Halil Pasic > Cc: Matthew Rosato > Cc: Jaehoon Kim > --- > arch/s390/Kconfig | 1 + > arch/s390/mm/init.c | 14 ++++++++++++++ > 2 files changed, 15 insertions(+) > > diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig > index ecbcbb781e40..9b5e6029e043 100644 > --- a/arch/s390/Kconfig > +++ b/arch/s390/Kconfig > @@ -87,6 +87,7 @@ config S390 > select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2 > select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE > select ARCH_HAS_CC_CAN_LINK > + select ARCH_HAS_CC_PLATFORM > select ARCH_HAS_CPU_FINALIZE_INIT > select ARCH_HAS_CURRENT_STACK_POINTER > select ARCH_HAS_DEBUG_VIRTUAL > diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c > index 1f72efc2a579..ad3c6d92b801 100644 > --- a/arch/s390/mm/init.c > +++ b/arch/s390/mm/init.c > @@ -50,6 +50,7 @@ > #include > #include > #include > +#include > > pgd_t swapper_pg_dir[PTRS_PER_PGD] __section(".bss..swapper_pg_dir"); > pgd_t invalid_pg_dir[PTRS_PER_PGD] __section(".bss..invalid_pg_dir"); > @@ -140,6 +141,19 @@ bool force_dma_unencrypted(struct device *dev) > return is_prot_virt_guest(); > } > > + > +bool cc_platform_has(enum cc_attr attr) > +{ > + switch (attr) { > + case CC_ATTR_MEM_ENCRYPT: > + return is_prot_virt_guest(); > + > + default: > + return false; > + } > +} > +EXPORT_SYMBOL_GPL(cc_platform_has); > + > /* protected virtualization */ > static void __init pv_init(void) > {