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[2003:d8:2f1b:b800:6fdb:1af2:4fbd:1fdf]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3a4efe5b92bsm21276266f8f.9.2025.06.04.05.26.49 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 04 Jun 2025 05:26:51 -0700 (PDT) Message-ID: Date: Wed, 4 Jun 2025 14:26:49 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v10 08/16] KVM: guest_memfd: Allow host to map guest_memfd pages 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, 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, peterx@redhat.com, pankaj.gupta@amd.com, ira.weiny@intel.com References: <20250527180245.1413463-1-tabba@google.com> <20250527180245.1413463-9-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-Rspam-User: X-Rspamd-Queue-Id: 65ACB1C0010 X-Rspamd-Server: rspam09 X-Stat-Signature: 1chscbc7h8f69hio51cgbebtns4bpzps X-HE-Tag: 1749040017-143649 X-HE-Meta: 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 itO8DQX+ 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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 27.05.25 20:02, Fuad Tabba wrote: > This patch enables support for shared memory in guest_memfd, including > mapping that memory at the host userspace. This support is gated by the > configuration option KVM_GMEM_SHARED_MEM, and toggled by the guest_memfd > flag GUEST_MEMFD_FLAG_SUPPORT_SHARED, which can be set when creating a > guest_memfd instance. > > Co-developed-by: Ackerley Tng > Signed-off-by: Ackerley Tng > Signed-off-by: Fuad Tabba > --- > arch/x86/include/asm/kvm_host.h | 10 ++++ > arch/x86/kvm/x86.c | 3 +- Nit: I would split off the x86 bits. Meaning, this patch would only introduce the infrastructure and a x86 KVM patch would enable it for selected x86 VMs. -- Cheers, David / dhildenb