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AJvYcCUeRLaXDp+VTS8ML1gJfJTiOm8TaquDmJZjoi8uPrjkdM28F+1q/v0zgs5ScgdTS1yVRarESGy7fQ==@kvack.org X-Gm-Message-State: AOJu0YyDpcJPvNNojLIlR0jA9Y18HrJDCUiAvSRdbEdFTIoA5MAbZu1v Cwd6hByrI2DiSgr5IZzO0Nwt+om9tIRF1cED4dEDQvUd7JRMGaUUN5YLEPgQ6vcVBwFGveROsSJ 6jQ== X-Google-Smtp-Source: AGHT+IEcdVpCbp8MjJf64q8k5e/VTPJ3pw7BA2+dZtfA0ZF4gfu1Oso/b3kULdysXS+hJCL6sJ2jnEhvsg== X-Received: from wmrn12.prod.google.com ([2002:a05:600c:500c:b0:441:bc26:4d3f]) (user=tabba job=prod-delivery.src-stubby-dispatcher) by 2002:a05:600c:820a:b0:43d:762:e0c4 with SMTP id 5b1f17b1804b1-44c959b79fdmr129129035e9.27.1748368995587; Tue, 27 May 2025 11:03:15 -0700 (PDT) Date: Tue, 27 May 2025 19:02:43 +0100 In-Reply-To: <20250527180245.1413463-1-tabba@google.com> Mime-Version: 1.0 References: <20250527180245.1413463-1-tabba@google.com> X-Mailer: git-send-email 2.49.0.1164.gab81da1b16-goog Message-ID: <20250527180245.1413463-15-tabba@google.com> Subject: [PATCH v10 14/16] KVM: arm64: Enable mapping guest_memfd in arm64 From: Fuad Tabba To: kvm@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-mm@kvack.org 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: rspam06 X-Rspamd-Queue-Id: 16C0F40005 X-Stat-Signature: qxejadtoj7ba3ykqimr5pbhmhtq33u58 X-Rspam-User: X-HE-Tag: 1748368996-697156 X-HE-Meta: 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 cmIOA6Dv ynxJ2PxB4XRAjMTkmZf60nxJsAO3Eyg03Rgzir0l3aZgOysG2Muk+n7IBrdPe65KOY4beU1inUM1fIBg8U22SbzOtB4rvukjeVhTSMzCGhI2ZQYA5hXCJgnHLUyisWQCGxd1R6CqHOZC0tNHwsVdrQoKUDHrwg3vt8aX8YF8ika5kVY+GFaO6Ut7Ti2o+J0n5faQMgTp2nH020RJ945s0Bkq9dz3eiEQG2Z9eJLIqYqgtp/mNO7/L00KCyTsbhlplp/2PRRftfAyUc2or8dczZ3ElHY28sQEtEFn78W7xOifoG7Fs+X3H3z8xBQ261UCda66rn4vUfkAJ968bl2Iy6h80bE4UA3oHAr4e/Qe7aDZxR04= 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 mapping guest_memfd backed memory at the host in arm64. For now, it applies to all arm64 VM types in arm64 that use guest_memfd. In the future, new VM types can restrict this via kvm_arch_gmem_supports_shared_mem(). 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 896c56683d88..03da08390bf0 100644 --- a/arch/arm64/kvm/mmu.c +++ b/arch/arm64/kvm/mmu.c @@ -2264,6 +2264,13 @@ 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); -- 2.49.0.1164.gab81da1b16-goog