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[2003:cb:c70b:db00:724d:8b0c:110e:3713]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-38bf3275755sm17081743f8f.80.2025.01.22.13.42.41 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 22 Jan 2025 13:42:44 -0800 (PST) Message-ID: Date: Wed, 22 Jan 2025 22:42:40 +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 Cc: kvm@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-mm@kvack.org, 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> <03bbcd00-bd5e-47de-8b20-31636e361f52@redhat.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: BFF074000B X-Stat-Signature: nktfibzqqeh43pjxmkgisnjc57ni8ctp X-Rspam-User: X-Rspamd-Server: rspam12 X-HE-Tag: 1737582170-636488 X-HE-Meta: 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 QMJAMKSK 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000016, 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 18:16, Fuad Tabba wrote: > Hi David, > > On Wed, 22 Jan 2025 at 15:41, David Hildenbrand wrote: >> >> On 22.01.25 16:35, David Hildenbrand wrote: >>> 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? > > You're right. This is a simplified version of my series that allows > mmaping of the new KVM_VM_TYPE_ARM_SW_PROTECTED vms to use for > experimentation. > > Cheers, > /fuad > >> >> Ah, I spot: >> >> +#define kvm_arch_private_mem_inplace(kvm) \ >> + (IS_ENABLED(CONFIG_KVM_GMEM_MAPPABLE) && \ >> + ((kvm)->arch.vm_type & KVM_VM_TYPE_ARM_SW_PROTECTED)) >> >> Which makes me wonder, why don't we need the same way of making sure all >> references/mappings are gone (+ new page type) when doing the shared -> >> private conversion? Or is this somewhere in here where I didn't spot it yet? > > This is new to this series. The idea, based on a request from Patrick > Roy, was to have a VM in arm64 we could use to experiment with. Since > it allows the unconditional mmaping, it's only useful for experiments > or for non-confidential VMs that want to use guest_memfd. > > This series isn't meant to replace the other one, more to supplement > it and facilitate experimentation while that's going. Heh, so "kvm_arch_private_mem_inplace" in this series means "no conversion at all" ? :) -- Cheers, David / dhildenb