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b=MuW+0SkDaj6TcBh5tWj7NWINk9IeGkj+gk38Z81L02q6aeunhtRaHnuWcwcwroGldt OnAldVAGNMz9ac9F9Kd1lfjvXnkuNOpOWJjxiTA8sPcHoyg5DL/8P/ouWYFI1ng33IQq WGpwmOEEHcOTvvgL9DeLpbDO/dKYozr+QAa7ex73jWDBkWHgzhYusTZdY7E6cPkcYV8D if2z+UdmnJ4rPMORffc677x8/3l1PNK7h23GlI2R8iI4Mxo/jbJb1p9iJD/NtWainXDp mJJBHTiLR8qElwMSHTNV1ONfZV0fynxLOps/2jXSXwCNSRTDGjx71zmFQ9sELFwsHIoO SqpA== X-Forwarded-Encrypted: i=1; AJvYcCVPPfb6Ytic9enqP/r7dJwjacxWcRH6x7Z/C7pEBc9SQGFwa0porJ7yuCWCRYAorP3BHRxDoBXcgQ==@kvack.org X-Gm-Message-State: AOJu0YyOJMQdEFlOrJn+bsto2DK2T+Q8wVVzTAmxXX1XCNLAy1rHlV6y XlatzfaMwUxecwWTV5GKy+uoYalrvaG8QOFtgQCPcVMcp1VfFAnMVDkUJdWjoHoTIVfFeTW826i 41Qn9mw== X-Received: from plss10.prod.google.com ([2002:a17:902:c64a:b0:29f:68b:3550]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a17:902:cf07:b0:2a2:bff6:42ef with SMTP id d9443c01a7336-2a7174fa860mr37848805ad.7.1768578064299; Fri, 16 Jan 2026 07:41:04 -0800 (PST) Date: Fri, 16 Jan 2026 07:41:02 -0800 In-Reply-To: <4781ba9c5d16394cdd785d008cf2a2d81c5cda35.camel@intel.com> Mime-Version: 1.0 References: <20260114134510.1835-1-kalyazin@amazon.com> <20260114134510.1835-8-kalyazin@amazon.com> <208b151b-f458-4327-94bc-eb3f32d20a68@amazon.com> <4781ba9c5d16394cdd785d008cf2a2d81c5cda35.camel@intel.com> Message-ID: Subject: Re: [PATCH v9 07/13] KVM: guest_memfd: Add flag to remove from direct map From: Sean Christopherson To: Rick P Edgecombe Cc: "kalyazin@amazon.com" , "kalyazin@amazon.co.uk" , "linux-riscv@lists.infradead.org" , "linux-s390@vger.kernel.org" , "linux-mm@kvack.org" , "linux-fsdevel@vger.kernel.org" , "linux-kselftest@vger.kernel.org" , "kernel@xen0n.name" , "kvmarm@lists.linux.dev" , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "kvm@vger.kernel.org" , "bpf@vger.kernel.org" , "loongarch@lists.linux.dev" , "linux-doc@vger.kernel.org" , "david@kernel.org" , "svens@linux.ibm.com" , "catalin.marinas@arm.com" , "palmer@dabbelt.com" , "jgross@suse.com" , "surenb@google.com" , "vbabka@suse.cz" , "riel@surriel.com" , "pfalcato@suse.de" , "x86@kernel.org" , "rppt@kernel.org" , "thuth@redhat.com" , "borntraeger@linux.ibm.com" , "maz@kernel.org" , "peterx@redhat.com" , "ast@kernel.org" , Vishal Annapurve , "pjw@kernel.org" , "alex@ghiti.fr" , "dave.hansen@linux.intel.com" , "tglx@linutronix.de" , "hca@linux.ibm.com" , "willy@infradead.org" , "wyihan@google.com" , "ryan.roberts@arm.com" , "yang@os.amperecomputing.com" , "jolsa@kernel.org" , "jmattson@google.com" , "luto@kernel.org" , "aneesh.kumar@kernel.org" , "haoluo@google.com" , "patrick.roy@linux.dev" , "akpm@linux-foundation.org" , "coxu@redhat.com" , "mhocko@suse.com" , "mlevitsk@redhat.com" , "jgg@ziepe.ca" , "hpa@zytor.com" , "song@kernel.org" , "Liam.Howlett@oracle.com" , "maobibo@loongson.cn" , "peterz@infradead.org" , "oupton@kernel.org" , "lorenzo.stoakes@oracle.com" , "jhubbard@nvidia.com" , "martin.lau@linux.dev" , "jthoughton@google.com" , "Jonathan.Cameron@huawei.com" , "Yu, Yu-cheng" , "eddyz87@gmail.com" , "yonghong.song@linux.dev" , "chenhuacai@kernel.org" , "shuah@kernel.org" , "prsampat@amd.com" , "kevin.brodsky@arm.com" , "shijie@os.amperecomputing.com" , "itazur@amazon.co.uk" , "suzuki.poulose@arm.com" , "pbonzini@redhat.com" , "dev.jain@arm.com" , "yuzenghui@huawei.com" , "gor@linux.ibm.com" , "jackabt@amazon.co.uk" , "daniel@iogearbox.net" , "agordeev@linux.ibm.com" , "andrii@kernel.org" , "mingo@redhat.com" , "aou@eecs.berkeley.edu" , "joey.gouly@arm.com" , "derekmn@amazon.com" , "xmarcalx@amazon.co.uk" , "kpsingh@kernel.org" , "sdf@fomichev.me" , "jackmanb@google.com" , "bp@alien8.de" , "corbet@lwn.net" , "ackerleytng@google.com" , "jannh@google.com" , "john.fastabend@gmail.com" , "kas@kernel.org" , "will@kernel.org" Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Stat-Signature: zrbf11pg6mjxkg85agaob3n376bxrg5p X-Rspam-User: X-Rspamd-Queue-Id: D17B7180003 X-Rspamd-Server: rspam08 X-HE-Tag: 1768578065-536111 X-HE-Meta: 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 QAlNB2w7 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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 Fri, Jan 16, 2026, Rick P Edgecombe wrote: > On Fri, 2026-01-16 at 15:02 +0000, Nikita Kalyazin wrote: > > > TDX does some clearing at the direct map mapping for pages that > > > comes from gmem, using a special instruction. It also does some > > > clflushing at the direct map address for these pages. So I think we > > > need to make sure TDs don't pull from gmem fds with this flag. > >=20 > > Would you be able to give a pointer on how we can do that?=C2=A0 I'm no= t > > very familiar with the TDX code. >=20 > Uhh, that is a good question. Let me think. Pass @kvm to kvm_arch_gmem_supports_no_direct_map() and then return %false = if it's a TDX VM.