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AJvYcCVqMTP9XJ6xCZfO4dRtC0J8nfp2ymFUNncHg/TnHyIEV9VoHCyI7bYORWejgbUWGEXwkbEImniQ7A==@kvack.org X-Gm-Message-State: AOJu0YzmHhAuaOifcZk9p+ZFR0L2ZejsEkVcBRuVYLSr2bbBwLL+q6I4 zZa1Pd6uoZjuZP3GcJGqmquK0x8qHt9XsJaTaawcX9aFSG9kyEfgZIK94fZqqTdx1gu4vD3mfY9 n+A== X-Google-Smtp-Source: AGHT+IHjMKXCvTmBxoiQUc3S0//vqXVb77uBJR4SvhxKOwINqq6jYrFaYhNl/XwH/tFcftUafwOB/rmHeg== X-Received: from wmbhc7.prod.google.com ([2002:a05:600c:8707:b0:442:f482:bba5]) (user=tabba job=prod-delivery.src-stubby-dispatcher) by 2002:a05:600c:1e89:b0:44b:eb56:1d45 with SMTP id 5b1f17b1804b1-451f0aa7ff9mr75040805e9.15.1749137913905; Thu, 05 Jun 2025 08:38:33 -0700 (PDT) Date: Thu, 5 Jun 2025 16:37:57 +0100 In-Reply-To: <20250605153800.557144-1-tabba@google.com> Mime-Version: 1.0 References: <20250605153800.557144-1-tabba@google.com> X-Mailer: git-send-email 2.49.0.1266.g31b7d2e469-goog Message-ID: <20250605153800.557144-16-tabba@google.com> Subject: [PATCH v11 15/18] KVM: arm64: Enable host mapping of shared guest_memfd memory From: Fuad Tabba To: 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, 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, 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, tabba@google.com Content-Type: text/plain; charset="UTF-8" X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 44E4CC000C X-Stat-Signature: 5mg5mhix6wzrsxypbhjqdyrucwd8sxh8 X-Rspam-User: X-HE-Tag: 1749137915-807956 X-HE-Meta: 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 u2pxmAgN rcIZN69VPEFVBi+TXY7PNWn3WbmZsKqbcmN/r2keL6zxkyDcmCndAoZ8zOvnYKEjfVjpUEWVHEpTUwiSLCyp0ei7A9Po7N/G3bqV8IMA0KUHBP1Q4Ud4diWX4bbGKA3e/mybxtHWPJvqMai70MC32E/Jqql9uQvm89sYTKtenpIe+dpUC6n5/USJtVMaO4l5F8YkVKZnLxhiSYnGL3sHuQ7z6N1OsrdVZjrbgciIljiFcH58WCSqO9p6KURT+MKYLrg6qzwanWlTtnjiriLhdj8WeszEVTzc+EJaIMOPKlZHH0UFarBKAx+Ga8QKwAmPqlTm6rbPZreuG2clEKr/O4NtH8uqeDFDFjfSZvYhbrP8bnpefdv1HB7RVLJIeA308n1IxICM9zZxlgPN7yOrMbSQCisuViJHJiMqgElxAg0cc7yuY0UIDTLqNlQtEOCj2m2F2qr4dWiLC4f6+I19UNcporHrLelVU0k6UMrwVT7c0seqVVYlmpFB2NUs5CkSX+YBXeaWuBWzvPjPZ0MKMvG9Q173YBYH1zx3rUgOgZAhWIW9psemsckcAUQdFOVd7OHJS55QtaqswDQro/j0A3tjsgoXB55n3UKu4GPp2Rmzh8AhcySrCDQZczOY9Xc3TMZaCYqRj/gF27CkK50eAgYmuqvyJd31uk8fi4gNJ8fIKfvR16U6jgwIn09ySurUbz+/7vPVZ+c7Jj1HME2dGY2mxdbU6HgYKT6Gj 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: Enable the host mapping of guest_memfd-backed memory on arm64. This applies to all current arm64 VM types that support guest_memfd. Future VM types can restrict this behavior via the kvm_arch_gmem_supports_shared_mem() hook if needed. Acked-by: David Hildenbrand Signed-off-by: Fuad Tabba --- arch/arm64/include/asm/kvm_host.h | 5 +++++ arch/arm64/kvm/Kconfig | 1 + arch/arm64/kvm/mmu.c | 7 +++++++ 3 files changed, 13 insertions(+) diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index 08ba91e6fb03..8add94929711 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -1593,4 +1593,9 @@ static inline bool kvm_arch_has_irq_bypass(void) return true; } +#ifdef CONFIG_KVM_GMEM +#define kvm_arch_supports_gmem(kvm) true +#define kvm_arch_supports_gmem_shared_mem(kvm) IS_ENABLED(CONFIG_KVM_GMEM_SHARED_MEM) +#endif + #endif /* __ARM64_KVM_HOST_H__ */ diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig index 096e45acadb2..8c1e1964b46a 100644 --- a/arch/arm64/kvm/Kconfig +++ b/arch/arm64/kvm/Kconfig @@ -38,6 +38,7 @@ menuconfig KVM select HAVE_KVM_VCPU_RUN_PID_CHANGE select SCHED_INFO select GUEST_PERF_EVENTS if PERF_EVENTS + select KVM_GMEM_SHARED_MEM help Support hosting virtualized guest machines. diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c index f14925fe6144..19aca1442bbf 100644 --- a/arch/arm64/kvm/mmu.c +++ b/arch/arm64/kvm/mmu.c @@ -2281,6 +2281,13 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm, if ((new->base_gfn + new->npages) > (kvm_phys_size(&kvm->arch.mmu) >> PAGE_SHIFT)) return -EFAULT; + /* + * Only support guest_memfd backed memslots with shared memory, since + * there aren't any CoCo VMs that support only private memory on arm64. + */ + if (kvm_slot_has_gmem(new) && !kvm_gmem_memslot_supports_shared(new)) + return -EINVAL; + hva = new->userspace_addr; reg_end = hva + (new->npages << PAGE_SHIFT); -- 2.49.0.1266.g31b7d2e469-goog