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[2003:d8:2f3c:3a00:5662:26b3:3e5d:438e]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3b5e8bd18ffsm3915762f8f.9.2025.07.11.02.36.57 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 11 Jul 2025 02:36:59 -0700 (PDT) Message-ID: <455fc70a-23e4-4c01-b502-37834473d195@redhat.com> Date: Fri, 11 Jul 2025 11:36:56 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v13 10/20] KVM: x86/mmu: Generalize private_max_mapping_level x86 op to max_mapping_level To: Fuad Tabba , kvm@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-mm@kvack.org, kvmarm@lists.linux.dev 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: <20250709105946.4009897-1-tabba@google.com> <20250709105946.4009897-11-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-Queue-Id: BDF60140007 X-Stat-Signature: tddwei7ynsx63a8y7o4a7aho1tsp3gfz X-Rspam-User: X-Rspamd-Server: rspam10 X-HE-Tag: 1752226623-629148 X-HE-Meta: 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 o+YmAkBX Kj1tiLFGEqQhYm7KZNUeyiwoo+wMgzjfB4piefsWfx5duCiHMXmLv6qAepEbXuhnQSUdxAbGsQCCFNlrf676oGXJ1MDOMM0xiPe6+RuEsG6O4za8vB0l1PJCcHP8LZoN43MHkTc4NieluLB3QiAvdKts4rWWA9eD1oJ+9/i2nMe9eGEmCLo/sKqhPU6ceUOZ6Kj+M 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 09.07.25 12:59, Fuad Tabba wrote: > From: Ackerley Tng > > Generalize the private_max_mapping_level x86 operation to > max_mapping_level. > > The private_max_mapping_level operation allows platform-specific code to > limit mapping levels (e.g., forcing 4K pages for certain memory types). > While it was previously used exclusively for private memory, guest_memfd > can now back both private and non-private memory. Platforms may have > specific mapping level restrictions that apply to guest_memfd memory > regardless of its privacy attribute. Therefore, generalize this > operation. > > Rename the operation: Removes the "private" prefix to reflect its > broader applicability to any guest_memfd-backed memory. > > Pass kvm_page_fault information: The operation is updated to receive a > struct kvm_page_fault object instead of just the pfn. This provides > platform-specific implementations (e.g., for TDX or SEV) with additional > context about the fault, such as whether it is private or shared, > allowing them to apply different mapping level rules as needed. > > Enforce "private-only" behavior (for now): Since the current consumers > of this hook (TDX and SEV) still primarily use it to enforce private > memory constraints, platform-specific implementations are made to return > 0 for non-private pages. A return value of 0 signals to callers that > platform-specific input should be ignored for that particular fault, > indicating no specific platform-imposed mapping level limits for > non-private pages. This allows the core MMU to continue determining the > mapping level based on generic rules for such cases. > > Suggested-by: Sean Christoperson > Signed-off-by: Ackerley Tng > Signed-off-by: Fuad Tabba > --- Acked-by: David Hildenbrand -- Cheers, David / dhildenb