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[142.167.56.70]) by smtp.gmail.com with ESMTPSA id af79cd13be357-7e356c649c0sm91045985a.73.2025.07.18.07.16.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 18 Jul 2025 07:16:00 -0700 (PDT) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1uclsV-00000009zBs-2Dun; Fri, 18 Jul 2025 11:15:59 -0300 Date: Fri, 18 Jul 2025 11:15:59 -0300 From: Jason Gunthorpe To: Xu Yilun Cc: Ackerley Tng , Yan Zhao , Vishal Annapurve , Alexey Kardashevskiy , Fuad Tabba , kvm@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, x86@kernel.org, linux-fsdevel@vger.kernel.org, ajones@ventanamicro.com, akpm@linux-foundation.org, amoorthy@google.com, anthony.yznaga@oracle.com, anup@brainfault.org, aou@eecs.berkeley.edu, bfoster@redhat.com, binbin.wu@linux.intel.com, brauner@kernel.org, catalin.marinas@arm.com, chao.p.peng@intel.com, chenhuacai@kernel.org, dave.hansen@intel.com, david@redhat.com, dmatlack@google.com, dwmw@amazon.co.uk, erdemaktas@google.com, fan.du@intel.com, fvdl@google.com, graf@amazon.com, haibo1.xu@intel.com, hch@infradead.org, hughd@google.com, ira.weiny@intel.com, isaku.yamahata@intel.com, jack@suse.cz, james.morse@arm.com, jarkko@kernel.org, jgowans@amazon.com, jhubbard@nvidia.com, jroedel@suse.de, jthoughton@google.com, jun.miao@intel.com, kai.huang@intel.com, keirf@google.com, kent.overstreet@linux.dev, kirill.shutemov@intel.com, liam.merwick@oracle.com, maciej.wieczor-retman@intel.com, mail@maciej.szmigiero.name, maz@kernel.org, mic@digikod.net, michael.roth@amd.com, mpe@ellerman.id.au, muchun.song@linux.dev, nikunj@amd.com, nsaenz@amazon.es, oliver.upton@linux.dev, palmer@dabbelt.com, pankaj.gupta@amd.com, paul.walmsley@sifive.com, pbonzini@redhat.com, pdurrant@amazon.co.uk, peterx@redhat.com, pgonda@google.com, pvorel@suse.cz, qperret@google.com, quic_cvanscha@quicinc.com, quic_eberman@quicinc.com, quic_mnalajal@quicinc.com, quic_pderrin@quicinc.com, quic_pheragu@quicinc.com, quic_svaddagi@quicinc.com, quic_tsoni@quicinc.com, richard.weiyang@gmail.com, rick.p.edgecombe@intel.com, rientjes@google.com, roypat@amazon.co.uk, rppt@kernel.org, seanjc@google.com, shuah@kernel.org, steven.price@arm.com, steven.sistare@oracle.com, suzuki.poulose@arm.com, thomas.lendacky@amd.com, usama.arif@bytedance.com, vbabka@suse.cz, viro@zeniv.linux.org.uk, vkuznets@redhat.com, wei.w.wang@intel.com, will@kernel.org, willy@infradead.org, xiaoyao.li@intel.com, yilun.xu@intel.com, yuzenghui@huawei.com, zhiquan1.li@intel.com Subject: Re: [RFC PATCH v2 04/51] KVM: guest_memfd: Introduce KVM_GMEM_CONVERT_SHARED/PRIVATE ioctls Message-ID: <20250718141559.GF2206214@ziepe.ca> References: <9502503f-e0c2-489e-99b0-94146f9b6f85@amd.com> <20250624130811.GB72557@ziepe.ca> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Queue-Id: 62095180017 X-Stat-Signature: a59xetopcwyfcz3nkrs1sgbngnnu556b X-Rspam-User: X-Rspamd-Server: rspam07 X-HE-Tag: 1752848162-377167 X-HE-Meta: U2FsdGVkX1+kZOS5d27ljJDwj/mfDu9KwkGTZQrrxAzmCOW/4JBAxMhPXy9zgR4Yr6I7KnRwrmR0+//IDw6pwph05YOIUHAA0LV2hPx9dnq514XKDlRIuY4gnSH47MawVfWEhvfsgnLyxnxu4LJ9EfQMWZKmPg5u+Pc7qEYOBp6q2nV64HJWQSDSK5f7XMQqKoTaWuplVGoMXOm/VDR5XB/wxq6AU2Unz9kPqkhdwsta3gs9mLX9zdKn8j1c81PLKRY9T2w/f9XWW/9DcxgC3Sqdn/ZTDCCHgj4ibSKCryOO7sSF+y3c0jV3mmHRqAJ5U3tzLYm9jbvGGS2DTtlZm33HBEdMuM+tEKDiU5nZe6EWH+4CKX8jYstnp+tUajwWsSUYUfSD0TBYMTOfzGtu8/pT8OkuiRok2U8iP0IZRXAWRYyJ48PCvClTq/6EPdp8MMAbtZKogXbxNVGXSCeQ7/5I9p/1BLNb703RJpvtgEflIw16+y9sEwchJjcy3/ye8AkowUUy7/CUZhPRZr8HhETJh2bPWAqElT8gWp+yXhdH0mv8Yo3gKtGEJzfiOm8aXIiPUWsXI2z+5Z6QkgLNm7dofkpYqFYc9GNAvY9rruBqvVXxjs2bdSbc9RKQByftK9mo6P5y8xtsmjsng35Iu15Sx+FfEzNGECII7J8lImaHqLgLMgCd5q11eKDjBzqgBDPagdt06/TlcyE9CQ6ums/j+yXBaO4XsDBIc+R0tr8r2E+7KEm7b1jgWgcvxLp+/X3u6Q+N2EXBZd4ZKxji8KiEKWBLcROWyjb4lsmDUn4ndBAeY/0GT1fOmlhT/tUHY3xcxjXPvWRRFv60SBWx+6ICbE92FPb61RHt0+wYjlfP1QlO9m2Z/wXoBRub+ulHCXK2jqdrF/tFkyS8RYL0Xp9XmjAkMPKxE3ITGnr0aTUmgd5kF1ow+NkJBekgxtBnVXQVqFOMbpngERQko88 pl999bhH 2yxsxUw0L0GCwKUIeIW+b3kiwVPf9q/BYWYj+YykuT4mdNiv4f9gijqhoZSsMu8ryXXOLuGdigley0E4AgBrVzLNJxl2+etWHlfoJDxDYbGIkR8BLpCvmvGZWsQqvYaFRH64sr8AE1siAh6uNHLrN7OXA3BEM1Dzc10qogv8VmgY9bG4q2A78EieMYc1XBplSP0r8qg1B4xcSCIkEF8K9/iZ3ZTFXQ7wscYW4XWyTQnYC0A3Gu7uNZ36gMxOd4KefQCrocNZ9dU9llptfUncgiZimus8oT4HN1rwR0mtBeSMfQj1QsRYOOOC4RFvugtoTa4oPZTD7TOu0IO62BdUizlVAQRnN/bCFFttpZYnURFsoxmbQ8ORMgHCaqe1lCYHIkku+nNomJ0hMOCkQo3dWIWWaew== 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 Fri, Jul 18, 2025 at 10:48:55AM +0800, Xu Yilun wrote: > > If by the time KVM gets the conversion request, the page is unpinned, > > then we're all good, right? > > Yes, unless guest doesn't unpin the page first by mistake. Guest would > invoke a fw call tdg.mem.page.release to unpin the page before > KVM_HC_MAP_GPA_RANGE. What does guest pinning mean? Jason