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[2003:cb:c70b:b400:e20a:6d03:7ac8:f97d]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-38bf3221b70sm18354607f8f.26.2025.01.23.01.14.13 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 23 Jan 2025 01:14:16 -0800 (PST) Message-ID: <1cd43e4c-e079-4b12-840a-f455f99f8b1b@redhat.com> Date: Thu, 23 Jan 2025 10:14:13 +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-Rspam-User: X-Rspamd-Queue-Id: AE547C0010 X-Rspamd-Server: rspam10 X-Stat-Signature: 3scj5pykh171u5ypc7a1ff9iyk7np4ds X-HE-Tag: 1737623663-121835 X-HE-Meta: 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 6YDobzWU 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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 23.01.25 10:09, Fuad Tabba wrote: > On Wed, 22 Jan 2025 at 21:42, David Hildenbrand wrote: >> >> 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" ? :) > > Yes, just for experimenting with the protected software VM. Got it, thanks! -- Cheers, David / dhildenb