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AJvYcCXxXptkA/v2rHjF/V8E5HWx00YCMkpCsQygXsEzFjPUI7v1ybkreBI045k4j8qMKVCTdskTbWpW+Mnwhxdq@vger.kernel.org X-Gm-Message-State: AOJu0YzklSzGgpbcq5wffzhVyV7+dG/Pu9r+IsCnI/TGCz+ucODJaSlr 6zPO9Amu8YKS0OXS92FOGTWh4FEOU8QE24yu5udCe7Mg5Xha7u5M1PucVCrqFYbaK1QPARO41A= = X-Google-Smtp-Source: AGHT+IFYYSu+z7lcdTevEwKYxKvR0BM42N5Yxez0Q/Zy8BqAGBeXJPTD7ox5Spif8yRdhs0jTp5x8CQKow== X-Received: from wmhu3.prod.google.com ([2002:a05:600c:a363:b0:43d:1d5b:1c79]) (user=tabba job=prod-delivery.src-stubby-dispatcher) by 2002:a05:600c:35d2:b0:43c:fffc:786c with SMTP id 5b1f17b1804b1-441b1f3ab0fmr32935775e9.19.1746032239805; Wed, 30 Apr 2025 09:57:19 -0700 (PDT) Date: Wed, 30 Apr 2025 17:56:53 +0100 In-Reply-To: <20250430165655.605595-1-tabba@google.com> Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250430165655.605595-1-tabba@google.com> X-Mailer: git-send-email 2.49.0.967.g6a0df3ecc3-goog Message-ID: <20250430165655.605595-12-tabba@google.com> Subject: [PATCH v8 11/13] 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, tabba@google.com Enable mapping guest_memfd in arm64. For now, it applies to all VMs 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 | 12 ++++++++++++ arch/arm64/kvm/Kconfig | 1 + 2 files changed, 13 insertions(+) diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index 08ba91e6fb03..1b1753e8021a 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -1593,4 +1593,16 @@ static inline bool kvm_arch_has_irq_bypass(void) return true; } +#ifdef CONFIG_KVM_GMEM +static inline bool kvm_arch_supports_gmem(struct kvm *kvm) +{ + return IS_ENABLED(CONFIG_KVM_GMEM); +} + +static inline bool kvm_arch_gmem_supports_shared_mem(struct kvm *kvm) +{ + return IS_ENABLED(CONFIG_KVM_GMEM_SHARED_MEM); +} +#endif /* CONFIG_KVM_GMEM */ + #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.