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b=U+NEuPjYVaMphb588UKQdnFGh8jYQIaGAFO5RSZHHS2uTzxjbffJ0wV4RvByDdefU /yAbktW7knDpaELNN+dmSB3mYqfeH46gUiJQvPoUWU1sRxnpQEcNRc5SovTJQpGxx0 MX5wycFo6RF4QbJ6mD/LrV9SeGtSHRPRI/ZrUiIsxHcf3ofChhVSa5fb/YtRPuuVz4 /NhVhbIKE79+8AeB5pLHK98D1jqVlLWG4xV/X3wBGY4Z2dgXyioYf3DdxMkfhIiKCh Tdm2s0Mn57hQU+44blC2fsrBL65MJMZlNp9/6m39D/5Bdr7xxK0cFMKlj06FkNGjb6 IintvPIq5gWUg== 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 1ueUqp-000bs6-Dx; Wed, 23 Jul 2025 09:29:23 +0100 Date: Wed, 23 Jul 2025 09:29:17 +0100 Message-ID: <87ms8vtin6.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 17/21] KVM: arm64: nv: Handle VNCR_EL2-triggered faults backed by guest_memfd In-Reply-To: <20250717162731.446579-18-tabba@google.com> References: <20250717162731.446579-1-tabba@google.com> <20250717162731.446579-18-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-Stat-Signature: 6mq8o7oh88jygcc4ean5h4npe7rtpzem X-Rspam-User: X-Rspamd-Queue-Id: E674EC0005 X-Rspamd-Server: rspam02 X-HE-Tag: 1753259366-792949 X-HE-Meta: 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 LZs/8BOf /YNnRuFYyCokhiSdEDPYuqUYdHbDEWsj3JnlCIMlRdWSm+YZYz1QCEaY4njYxmEtX3AFTy6IuS6an1bvujS0i3s3c3eK7aWeAnycen2xemWx2pizCHTpL8/AmB8PC/aU8mFdqNCDsUTBXu14mjHYblF+VuQrliPQtIyS7J3E++c27iPhIc9o3OoySpbb3YvjyYOJRsum+miWLGQU7w3ctDr2DNwenm5bwwH8FTX9/EAnWiK0cYdebJLRi1eNK1SBu0mLvK9Ly1r1YVoUMfHc09qXFNiaQudZ3wdu9qhra2eO91/uU/3g9nL61vTFLq16AxuBglpQ39ZfOSLZIzLalDaYUJQ== 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 17:27:27 +0100, Fuad Tabba wrote: > > Handle faults for memslots backed by guest_memfd in arm64 nested > virtualization triggerred by VNCR_EL2. > > * Introduce is_gmem output parameter to kvm_translate_vncr(), indicating > whether the faulted memory slot is backed by guest_memfd. > > * Dispatch faults backed by guest_memfd to kvm_gmem_get_pfn(). > > * Update kvm_handle_vncr_abort() to handle potential guest_memfd errors. > Some of the guest_memfd errors need to be handled by userspace, > instead of attempting to (implicitly) retry by returning to the guest. > > Suggested-by: Marc Zyngier > Signed-off-by: Fuad Tabba Reviewed-by: Marc Zyngier M. -- Jazz isn't dead. It just smells funny.