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[2003:d8:2f1b:b800:6fdb:1af2:4fbd:1fdf]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3a4efe73eebsm21436129f8f.44.2025.06.04.06.02.50 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 04 Jun 2025 06:02:52 -0700 (PDT) Message-ID: <0835025c-a799-4ffc-9dea-52b64ffcb96a@redhat.com> Date: Wed, 4 Jun 2025 15:02:49 +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 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, 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-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 40F014000E X-Stat-Signature: kpwy6y71d3f58xjog5nofmor11jbkdcg X-Rspam-User: X-HE-Tag: 1749042206-779060 X-HE-Meta: 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 CIsZ0Kcq 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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 04.06.25 14:32, Fuad Tabba wrote: > Hi David, > > On Wed, 4 Jun 2025 at 13:26, David Hildenbrand wrote: >> >> 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. > > Will do. And probably that patch should come after/with the x86 mmu bits. -- Cheers, David / dhildenb