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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 Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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 Content-Language: en-US Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit 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