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[2003:cb:c713:3b00:16ce:8f1c:dd50:90fb]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-438dcc6df1esm64941645e9.27.2025.01.30.08.50.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 30 Jan 2025 08:50:16 -0800 (PST) Message-ID: <6810dbdb-1b44-4656-9f65-abca471523f9@redhat.com> Date: Thu, 30 Jan 2025 17:50:13 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH v2 00/11] KVM: Mapping guest_memfd backed memory at the host for software protected VMs 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: <20250129172320.950523-1-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-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: C9245140017 X-Stat-Signature: q3aupyuayj1iphubw98ywfkc59sacuc3 X-Rspam-User: X-HE-Tag: 1738255820-450571 X-HE-Meta: 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 QReDOS7K 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000031, 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 29.01.25 18:23, Fuad Tabba wrote: Thanks for the new version > Main changes since v1 [1]: > - Added x86 support for mapping guest_memfd at the host, enabled > only for the KVM_X86_SW_PROTECTED_VM type. Nice! > - Require setting memslot userspace_addr for guest_memfd slots > even if shared, and remove patches that worked around that. > - Brought in more of the infrastructure from the patch series > that allows restricted mapping of guest_memfd backed memory. Ah, that explains why we see the page_type stuff in here now :) > - Renamed references to "mappable" -> "shared". > - Expanded the selftests. > - Added instructions to test on x86 and arm64 (below). Very nice! I assume there is still no page conversion happening -- or is there now that the page_stuff thing is in here? Would be good to spell out what's supported and what's still TBD regarding mmap support. -- Cheers, David / dhildenb