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b=KgxqRpqvnS9XMnEfExsx/b9BIdFFIXT0mgj5tZeBil26sOCmyigBk1hjuKRcMT6NJ Nho0Fqu0mPadxYBYZTtEdgD5bN12bWlFC0G/LfFDKBXIrbSZAdXvGf1Hgx1U5B+wo1 7p4eRpiuN7E8N0TtwiyZXgNqsDxINXHoBaSaMXPbDowEHo2H3EbjDEuiU3vWVPuqE+ Npekzaz2lgUMsQwzu0Xs7lFV6OsKXpqMI8CHS67s5pu4RgYoW0hxT5HEquoLl+ua1+ ntK0b2+9duh3mwF3uRBl5OKFv3Pty8vbWJpg4mZNOaEU0sFI3Lf9IKPkYLjmrBr2OV ULmlGb5coiOgw== Received: from 82-132-236-66.dab.02.net ([82.132.236.66] helo=lobster-girl.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1ueUoE-000bpL-7x; Wed, 23 Jul 2025 09:26:42 +0100 Date: Wed, 23 Jul 2025 09:26:30 +0100 Message-ID: <87o6tbtirt.wl-maz@kernel.org> From: Marc Zyngier To: Fuad Tabba Cc: kvm@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-mm@kvack.org, kvmarm@lists.linux.dev, 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, david@redhat.com, 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, 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 Subject: Re: [PATCH v15 16/21] KVM: arm64: Handle guest_memfd-backed guest page faults In-Reply-To: <20250717162731.446579-17-tabba@google.com> References: <20250717162731.446579-1-tabba@google.com> <20250717162731.446579-17-tabba@google.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/30.1 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; 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SAEximRunCond expanded to false X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 8B91E1C0003 X-Stat-Signature: skrryqu84a5to7h36mugncgg98r76xpk X-Rspam-User: X-HE-Tag: 1753259206-465398 X-HE-Meta: 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 HZps6tT4 H5coLJPGhCZWnOs0KKITfLbD4MkuD6FrqCjUd4M07VpUdh7NXB6tcyLfoNz8/ZKDjduTsXmBrXjORPOxgU66LMBd2d15TdhoLaX4ErnKnKfiTwQ48EKFg9y3ay35xljqE27CC9a05Ria44zZTf07bPjcjAo9oLJiQAXosHJPTcCFoj2O15qgR9dfH/NsLdw+QLvzg92GQdelztMjsgtiIj7dcYmplhbQC5QSjvfy5cNkgpSkF2tXU1Gpj8ZSaSWQ9zpUVTgsfRQqpCqGzRaFa/+h6H5U++dUEipLCpRBa5cAvz94qZvEJLJOE/Jz3L5OnFkaOLMns3x+ce4OIbIQgTFF77Rtrwuvi5UkgpRWDj2iEC7NgfDnNJLVX3WHdQvvC6u7Rfp7+yaAtwniO8JBQz2Kivn+RhQol9A9j/vS7BLBLB2hSfVDB3JJkHg== 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 Thu, 17 Jul 2025 17:27:26 +0100, Fuad Tabba wrote: > > Add arm64 architecture support for handling guest page faults on memory > slots backed by guest_memfd. > > This change introduces a new function, gmem_abort(), which encapsulates > the fault handling logic specific to guest_memfd-backed memory. The > kvm_handle_guest_abort() entry point is updated to dispatch to > gmem_abort() when a fault occurs on a guest_memfd-backed memory slot (as > determined by kvm_slot_has_gmem()). > > Until guest_memfd gains support for huge pages, the fault granule for > these memory regions is restricted to PAGE_SIZE. > > Reviewed-by: Gavin Shan > Reviewed-by: James Houghton > Signed-off-by: Fuad Tabba Reviewed-by: Marc Zyngier M. -- Jazz isn't dead. It just smells funny.