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[2003:cb:c70b:db00:724d:8b0c:110e:3713]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-438b31df407sm29654035e9.37.2025.01.22.07.35.47 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 22 Jan 2025 07:35:49 -0800 (PST) Message-ID: Date: Wed, 22 Jan 2025 16:35:47 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH v1 0/9] KVM: Mapping of guest_memfd at the host and a software protected VM type 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, yu.c.zhang@linux.intel.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 References: <20250122152738.1173160-1-tabba@google.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Stat-Signature: uhb6z8wng8iz5mcrxjo134mrg8c784fr X-Rspam-User: X-Rspamd-Queue-Id: 9818C1A0020 X-Rspamd-Server: rspam03 X-HE-Tag: 1737560156-969335 X-HE-Meta: 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 BWVCK7fv 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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 22.01.25 16:27, Fuad Tabba wrote: > The purpose of this series is to serve as a potential base for > restricted mmap() support for guest_memfd [1]. It would allow > experimentation with what that support would be like, in the safe > environment of a new VM type used for testing. > > This series adds a new VM type for arm64, > KVM_VM_TYPE_ARM_SW_PROTECTED, analogous to the x86 > KVM_X86_SW_PROTECTED_VM. This type is to serve as a development > and testing vehicle for Confidential (CoCo) VMs. > > Similar to the x86 type, this is currently only for development > and testing. It's not meant to be used for "real" VMs, and > especially not in production. The behavior and effective ABI for > software-protected VMs is unstable. > > This series enables mmap() support for guest_memfd specifically > for the new software-protected VM type, only when explicitly > enabled in the config. Hi! IIUC, in this series, there is no "private" vs "shared" distinction, right? So all pages are mappable, and "conversion" does not exist? -- Cheers, David / dhildenb