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[142.162.112.119]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-5061c14815asm18573661cf.6.2026.02.04.04.47.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Feb 2026 04:47:15 -0800 (PST) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1vncHr-0000000Gzio-1QmV; Wed, 04 Feb 2026 08:47:15 -0400 Date: Wed, 4 Feb 2026 08:47:15 -0400 From: Jason Gunthorpe To: Xu Yilun Cc: Sean Christopherson , Ackerley Tng , Alexey Kardashevskiy , cgroups@vger.kernel.org, kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org, x86@kernel.org, akpm@linux-foundation.org, binbin.wu@linux.intel.com, bp@alien8.de, brauner@kernel.org, chao.p.peng@intel.com, chenhuacai@kernel.org, corbet@lwn.net, dave.hansen@intel.com, dave.hansen@linux.intel.com, david@redhat.com, dmatlack@google.com, erdemaktas@google.com, fan.du@intel.com, fvdl@google.com, haibo1.xu@intel.com, hannes@cmpxchg.org, hch@infradead.org, hpa@zytor.com, 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, liam.merwick@oracle.com, maciej.wieczor-retman@intel.com, mail@maciej.szmigiero.name, maobibo@loongson.cn, mathieu.desnoyers@efficios.com, maz@kernel.org, mhiramat@kernel.org, mhocko@kernel.org, mic@digikod.net, michael.roth@amd.com, mingo@redhat.com, mlevitsk@redhat.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, peterx@redhat.com, pgonda@google.com, prsampat@amd.com, pvorel@suse.cz, qperret@google.com, richard.weiyang@gmail.com, rick.p.edgecombe@intel.com, rientjes@google.com, rostedt@goodmis.org, roypat@amazon.co.uk, rppt@kernel.org, shakeel.butt@linux.dev, shuah@kernel.org, steven.price@arm.com, steven.sistare@oracle.com, suzuki.poulose@arm.com, tabba@google.com, tglx@linutronix.de, thomas.lendacky@amd.com, vannapurve@google.com, vbabka@suse.cz, viro@zeniv.linux.org.uk, vkuznets@redhat.com, wei.w.wang@intel.com, will@kernel.org, willy@infradead.org, wyihan@google.com, xiaoyao.li@intel.com, yan.y.zhao@intel.com, yilun.xu@intel.com, yuzenghui@huawei.com, zhiquan1.li@intel.com Subject: Re: [RFC PATCH v1 05/37] KVM: guest_memfd: Wire up kvm_get_memory_attributes() to per-gmem attributes Message-ID: <20260204124715.GA2328995@ziepe.ca> References: <071a3c6603809186e914fe5fed939edee4e11988.1760731772.git.ackerleytng@google.com> <07836b1d-d0d8-40f2-8f7b-7805beca31d0@amd.com> <20260129003753.GZ1641016@ziepe.ca> <20260203181618.GY2328995@ziepe.ca> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Queue-Id: B8BC31C0003 X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: 6emo7g31ghe6x1bwfwrycoy6w1qnhsge X-HE-Tag: 1770209237-3676 X-HE-Meta: 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 KjVXr9RK SoHd98JEIFd5IVpwVsWq4KjLDHDDExtv+YXyAA+DCoBp77EhexcCBwKKTVtMxHCC26nJol6LKoRLkXhjdWloqIfK7YmNdIjpnfQ5vpB4QKm2BDVc= 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 Wed, Feb 04, 2026 at 12:43:16PM +0800, Xu Yilun wrote: > > Which means we need VFIO to know what they are, and hopefully it is > > just static based on the TDISP reports.. > > I don't think VMM need to check TDISP report. The only special thing is > the MSI-X mixed pages which can be figured out by standard PCI > discovery. Either that or follow along with the guests's choices on shared/private. We can't let VFIO mmap a private MMIO page, so it has to know which pages are private at any moment, and it can't guess. Jason