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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id D8A06C5B549 for ; Wed, 4 Jun 2025 13:17:46 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 79C928D001B; Wed, 4 Jun 2025 09:17:46 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 7741F8D0007; Wed, 4 Jun 2025 09:17:46 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 641988D001B; Wed, 4 Jun 2025 09:17:46 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id 439018D0007 for ; Wed, 4 Jun 2025 09:17:46 -0400 (EDT) Received: from smtpin25.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay04.hostedemail.com (Postfix) with ESMTP id AC77A1A1590 for ; Wed, 4 Jun 2025 13:17:45 +0000 (UTC) X-FDA: 83517770490.25.D90709A Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by imf22.hostedemail.com (Postfix) with ESMTP id 55CEEC0003 for ; Wed, 4 Jun 2025 13:17:43 +0000 (UTC) Authentication-Results: imf22.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=dWAfgJmW; dmarc=pass (policy=quarantine) header.from=redhat.com; spf=pass (imf22.hostedemail.com: domain of david@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=david@redhat.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1749043063; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=/TnCPLo7SwNXQ99zqfPK7hs6SsggMXG86UHZsu9nEYY=; b=G1VBwjngzVl4uNSCMSlnX4OoqsBmC33kSUn5J8XIucsIjRd++u7l18Iu2lDL/rmueNAnXy iJv+u5mYy2ajuPNTxeB1YzpOYeaB42zTzTXuKG+SMn+ZSuDZj/R9g3D2LnHwg4b8MAPi/G iEvzUu0pCAnzgcd2175svWVQ7zPBmf0= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1749043063; a=rsa-sha256; cv=none; b=lAF4RJOYzZ4w/xlaMRDKNEF2Pz2LWPrSPlkpjI+xyKL3KnrbIUQjDdNJYlfqtgR0LUgFLG QFeeCGaSh5gEAET9hconFg6du/C5FFkLhaGL8pYqdWwWvxKBs6sVa2gIuD1/E3gKEJwVme UcOcxsLgIoysLdPX33fMQqiPtdLI4J0= ARC-Authentication-Results: i=1; imf22.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=dWAfgJmW; dmarc=pass (policy=quarantine) header.from=redhat.com; spf=pass (imf22.hostedemail.com: domain of david@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=david@redhat.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1749043062; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=/TnCPLo7SwNXQ99zqfPK7hs6SsggMXG86UHZsu9nEYY=; b=dWAfgJmWfOHwu7rxrL3jKg2UM7/apD5/pV/XS11TlEG9QH4y5UIB7xwz7DLC2dK5cHa5IV LPakgYZLhLAdXRNTyBC/+Ii5x7OOm8VqzS+3lebwoGSIL+op95XQTCS5hMpWSBIEUyE5rv tkE+hwCtILAJ+0FbyHMcd4n6bZjj7bY= Received: from mail-wm1-f71.google.com (mail-wm1-f71.google.com [209.85.128.71]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-504-B8NMliNdP8CNYAZ9Vv5YPw-1; Wed, 04 Jun 2025 09:17:41 -0400 X-MC-Unique: B8NMliNdP8CNYAZ9Vv5YPw-1 X-Mimecast-MFC-AGG-ID: B8NMliNdP8CNYAZ9Vv5YPw_1749043060 Received: by mail-wm1-f71.google.com with SMTP id 5b1f17b1804b1-450d57a0641so46578565e9.3 for ; Wed, 04 Jun 2025 06:17:41 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1749043060; x=1749647860; h=content-transfer-encoding:in-reply-to:organization:autocrypt :content-language:from:references:cc:to:subject:user-agent :mime-version:date:message-id:x-gm-message-state:from:to:cc:subject :date:message-id:reply-to; bh=/TnCPLo7SwNXQ99zqfPK7hs6SsggMXG86UHZsu9nEYY=; b=d3ogPcYAr7/+MHx1mkM6uKwWy80esZItWFq/PrmhgzjV4zvIpN8fuIqFzsWdnIGqBp FH4tEHZBoMBwPxmiNC00w13t+cmo+oH140S8LSb/Pu9ptsEp9jACt0UnsJNLDYlMoYFd +WhpBw7JE/WH1uIFZ9V5UboVruo6DRhj0pu9lBfqtUW1bMvPvZd8sitFiwEL9q5bRNY2 QTvXeAyFUAsEYbZLg9vswpw5+BHr9Db4i7VRJMXWn3qcHOTQCJrVlQs7g2QM+PzdwyOr fMw12Grrl7IYH4GQrc3KT0me1LuqHjWUZa6U59YsWf9p7+XNa/GHY08TjZj3NYoWiuws hxOA== X-Forwarded-Encrypted: i=1; AJvYcCUZqt7xI4Hf3X6g4WqUj6UHJOD/ENgsnZfMG5462Z8bPDFDe4Lw/1J7oWYap1WCOBKSS9Loz2MTkw==@kvack.org X-Gm-Message-State: AOJu0YxhhNdJY8djS6T03JuKOxpNTWZ0zjyCMzEOg8WU59XQ8tEDwwnK hgdAXIu8cuTlnFyIhS0IJofzH3nH/IJvfuY0W4Ry44EhYNwIOhTiyenj4m6xmPgND18qYV4e2zd OvC5flal0FxUNemW22zOd9zKfgojF21hWkMizwEuc35ai2LZln6Ac X-Gm-Gg: ASbGncud127KqxQ4IaK7T54f8sXiuO8EczVJn+0GpDnY4g9zXV8DXGuhdT4EOfJofFu sRC1V7d2FSpAe3bwDHKJ3HNX2iF8/Wku5mTyIma9M3xGhsKS0MJ7df319lEbb/yuEBK4wH6wMV4 wko1jlDY83Ay1B61dLK3KI4sjT7ZS33mUysyPhyeMvoXkw89VIgKZjWb2OPSaqjtdLLJ79QV1NL fG17Y2YnEY9AHW8qkiZRmgx4MypY45jHhOvINUpXxNzfh4DFS9udXCpXSTcuLSjUWc1v7HEYXzO x3baCuSsKzI2jiy0WFFTPiq5lXknZZ6/oA/BWas2U/IWfbmK38UWtBojZ9r9B6AdD9pMGUom8v3 UTigbVaQImRXidMQKkybTc4fyD/Bn/3yfBDmDCGI= X-Received: by 2002:a05:600c:1c15:b0:442:cab1:e092 with SMTP id 5b1f17b1804b1-451f0aa1786mr24938875e9.11.1749043060421; Wed, 04 Jun 2025 06:17:40 -0700 (PDT) X-Google-Smtp-Source: AGHT+IEI+PjoECIlE96kE7n0skpA8Sn5MtB+ljNzzmCN9Vh8LfYPw6h4AZgMikfB+fMhTzVlJs+Ngw== X-Received: by 2002:a05:600c:1c15:b0:442:cab1:e092 with SMTP id 5b1f17b1804b1-451f0aa1786mr24938565e9.11.1749043059991; Wed, 04 Jun 2025 06:17:39 -0700 (PDT) Received: from ?IPV6:2003:d8:2f1b:b800:6fdb:1af2:4fbd:1fdf? (p200300d82f1bb8006fdb1af24fbd1fdf.dip0.t-ipconnect.de. [2003:d8:2f1b:b800:6fdb:1af2:4fbd:1fdf]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-450d7fb05bbsm195713315e9.22.2025.06.04.06.17.37 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 04 Jun 2025 06:17:39 -0700 (PDT) Message-ID: <2195c01b-3a17-46c5-a013-66922e8509bd@redhat.com> Date: Wed, 4 Jun 2025 15:17:37 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v10 14/16] KVM: arm64: Enable mapping guest_memfd in arm64 To: Fuad Tabba , kvm@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-mm@kvack.org Cc: pbonzini@redhat.com, chenhuacai@kernel.org, mpe@ellerman.id.au, anup@brainfault.org, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, seanjc@google.com, viro@zeniv.linux.org.uk, brauner@kernel.org, willy@infradead.org, akpm@linux-foundation.org, xiaoyao.li@intel.com, yilun.xu@intel.com, chao.p.peng@linux.intel.com, jarkko@kernel.org, amoorthy@google.com, dmatlack@google.com, isaku.yamahata@intel.com, mic@digikod.net, vbabka@suse.cz, vannapurve@google.com, ackerleytng@google.com, mail@maciej.szmigiero.name, michael.roth@amd.com, wei.w.wang@intel.com, liam.merwick@oracle.com, isaku.yamahata@gmail.com, kirill.shutemov@linux.intel.com, suzuki.poulose@arm.com, steven.price@arm.com, quic_eberman@quicinc.com, quic_mnalajal@quicinc.com, quic_tsoni@quicinc.com, quic_svaddagi@quicinc.com, quic_cvanscha@quicinc.com, quic_pderrin@quicinc.com, quic_pheragu@quicinc.com, catalin.marinas@arm.com, james.morse@arm.com, yuzenghui@huawei.com, oliver.upton@linux.dev, maz@kernel.org, will@kernel.org, qperret@google.com, keirf@google.com, roypat@amazon.co.uk, shuah@kernel.org, hch@infradead.org, jgg@nvidia.com, rientjes@google.com, jhubbard@nvidia.com, fvdl@google.com, hughd@google.com, jthoughton@google.com, peterx@redhat.com, pankaj.gupta@amd.com, ira.weiny@intel.com References: <20250527180245.1413463-1-tabba@google.com> <20250527180245.1413463-15-tabba@google.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZgEEwEIAEICGwMGCwkIBwMCBhUIAgkKCwQW AgMBAh4BAheAAhkBFiEEG9nKrXNcTDpGDfzKTd4Q9wD/g1oFAl8Ox4kFCRKpKXgACgkQTd4Q 9wD/g1oHcA//a6Tj7SBNjFNM1iNhWUo1lxAja0lpSodSnB2g4FCZ4R61SBR4l/psBL73xktp rDHrx4aSpwkRP6Epu6mLvhlfjmkRG4OynJ5HG1gfv7RJJfnUdUM1z5kdS8JBrOhMJS2c/gPf wv1TGRq2XdMPnfY2o0CxRqpcLkx4vBODvJGl2mQyJF/gPepdDfcT8/PY9BJ7FL6Hrq1gnAo4 3Iv9qV0JiT2wmZciNyYQhmA1V6dyTRiQ4YAc31zOo2IM+xisPzeSHgw3ONY/XhYvfZ9r7W1l pNQdc2G+o4Di9NPFHQQhDw3YTRR1opJaTlRDzxYxzU6ZnUUBghxt9cwUWTpfCktkMZiPSDGd KgQBjnweV2jw9UOTxjb4LXqDjmSNkjDdQUOU69jGMUXgihvo4zhYcMX8F5gWdRtMR7DzW/YE BgVcyxNkMIXoY1aYj6npHYiNQesQlqjU6azjbH70/SXKM5tNRplgW8TNprMDuntdvV9wNkFs 9TyM02V5aWxFfI42+aivc4KEw69SE9KXwC7FSf5wXzuTot97N9Phj/Z3+jx443jo2NR34XgF 89cct7wJMjOF7bBefo0fPPZQuIma0Zym71cP61OP/i11ahNye6HGKfxGCOcs5wW9kRQEk8P9 M/k2wt3mt/fCQnuP/mWutNPt95w9wSsUyATLmtNrwccz63XOwU0EVcufkQEQAOfX3n0g0fZz Bgm/S2zF/kxQKCEKP8ID+Vz8sy2GpDvveBq4H2Y34XWsT1zLJdvqPI4af4ZSMxuerWjXbVWb T6d4odQIG0fKx4F8NccDqbgHeZRNajXeeJ3R7gAzvWvQNLz4piHrO/B4tf8svmRBL0ZB5P5A 2uhdwLU3NZuK22zpNn4is87BPWF8HhY0L5fafgDMOqnf4guJVJPYNPhUFzXUbPqOKOkL8ojk CXxkOFHAbjstSK5Ca3fKquY3rdX3DNo+EL7FvAiw1mUtS+5GeYE+RMnDCsVFm/C7kY8c2d0G NWkB9pJM5+mnIoFNxy7YBcldYATVeOHoY4LyaUWNnAvFYWp08dHWfZo9WCiJMuTfgtH9tc75 7QanMVdPt6fDK8UUXIBLQ2TWr/sQKE9xtFuEmoQGlE1l6bGaDnnMLcYu+Asp3kDT0w4zYGsx 5r6XQVRH4+5N6eHZiaeYtFOujp5n+pjBaQK7wUUjDilPQ5QMzIuCL4YjVoylWiBNknvQWBXS lQCWmavOT9sttGQXdPCC5ynI+1ymZC1ORZKANLnRAb0NH/UCzcsstw2TAkFnMEbo9Zu9w7Kv AxBQXWeXhJI9XQssfrf4Gusdqx8nPEpfOqCtbbwJMATbHyqLt7/oz/5deGuwxgb65pWIzufa N7eop7uh+6bezi+rugUI+w6DABEBAAHCwXwEGAEIACYCGwwWIQQb2cqtc1xMOkYN/MpN3hD3 AP+DWgUCXw7HsgUJEqkpoQAKCRBN3hD3AP+DWrrpD/4qS3dyVRxDcDHIlmguXjC1Q5tZTwNB boaBTPHSy/Nksu0eY7x6HfQJ3xajVH32Ms6t1trDQmPx2iP5+7iDsb7OKAb5eOS8h+BEBDeq 3ecsQDv0fFJOA9ag5O3LLNk+3x3q7e0uo06XMaY7UHS341ozXUUI7wC7iKfoUTv03iO9El5f XpNMx/YrIMduZ2+nd9Di7o5+KIwlb2mAB9sTNHdMrXesX8eBL6T9b+MZJk+mZuPxKNVfEQMQ a5SxUEADIPQTPNvBewdeI80yeOCrN+Zzwy/Mrx9EPeu59Y5vSJOx/z6OUImD/GhX7Xvkt3kq Er5KTrJz3++B6SH9pum9PuoE/k+nntJkNMmQpR4MCBaV/J9gIOPGodDKnjdng+mXliF3Ptu6 3oxc2RCyGzTlxyMwuc2U5Q7KtUNTdDe8T0uE+9b8BLMVQDDfJjqY0VVqSUwImzTDLX9S4g/8 kC4HRcclk8hpyhY2jKGluZO0awwTIMgVEzmTyBphDg/Gx7dZU1Xf8HFuE+UZ5UDHDTnwgv7E th6RC9+WrhDNspZ9fJjKWRbveQgUFCpe1sa77LAw+XFrKmBHXp9ZVIe90RMe2tRL06BGiRZr jPrnvUsUUsjRoRNJjKKA/REq+sAnhkNPPZ/NNMjaZ5b8Tovi8C0tmxiCHaQYqj7G2rgnT0kt WNyWQQ== Organization: Red Hat In-Reply-To: <20250527180245.1413463-15-tabba@google.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: x6phSue21U8TWGdya3AEOcAvUQutsUy1VyG7wzkVu4g_1749043060 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 55CEEC0003 X-Stat-Signature: m9jst57ebeiimieoo8tcyxryeawxug4y X-Rspam-User: X-HE-Tag: 1749043063-359355 X-HE-Meta: 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 T2OxqEaa 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 27.05.25 20:02, Fuad Tabba wrote: > Enable mapping guest_memfd backed memory at the host in arm64. For now, > it applies to all arm64 VM types in arm64 that use guest_memfd. In the > future, new VM types can restrict this via > kvm_arch_gmem_supports_shared_mem(). > > Signed-off-by: Fuad Tabba > --- > arch/arm64/include/asm/kvm_host.h | 5 +++++ > arch/arm64/kvm/Kconfig | 1 + > arch/arm64/kvm/mmu.c | 7 +++++++ > 3 files changed, 13 insertions(+) > > diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h > index 08ba91e6fb03..8add94929711 100644 > --- a/arch/arm64/include/asm/kvm_host.h > +++ b/arch/arm64/include/asm/kvm_host.h > @@ -1593,4 +1593,9 @@ static inline bool kvm_arch_has_irq_bypass(void) > return true; > } > > +#ifdef CONFIG_KVM_GMEM > +#define kvm_arch_supports_gmem(kvm) true > +#define kvm_arch_supports_gmem_shared_mem(kvm) IS_ENABLED(CONFIG_KVM_GMEM_SHARED_MEM) > +#endif > + > #endif /* __ARM64_KVM_HOST_H__ */ > diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig > index 096e45acadb2..8c1e1964b46a 100644 > --- a/arch/arm64/kvm/Kconfig > +++ b/arch/arm64/kvm/Kconfig > @@ -38,6 +38,7 @@ menuconfig KVM > select HAVE_KVM_VCPU_RUN_PID_CHANGE > select SCHED_INFO > select GUEST_PERF_EVENTS if PERF_EVENTS > + select KVM_GMEM_SHARED_MEM > help > Support hosting virtualized guest machines. > > diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c > index 896c56683d88..03da08390bf0 100644 > --- a/arch/arm64/kvm/mmu.c > +++ b/arch/arm64/kvm/mmu.c > @@ -2264,6 +2264,13 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm, > if ((new->base_gfn + new->npages) > (kvm_phys_size(&kvm->arch.mmu) >> PAGE_SHIFT)) > return -EFAULT; > > + /* > + * Only support guest_memfd backed memslots with shared memory, since > + * there aren't any CoCo VMs that support only private memory on arm64. > + */ > + if (kvm_slot_has_gmem(new) && !kvm_gmem_memslot_supports_shared(new)) > + return -EINVAL; > + Right, that can get lifted once we have such VMs. Acked-by: David Hildenbrand -- Cheers, David / dhildenb