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 FBULVCwR 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 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 7/9/2025 4:29 PM, Fuad Tabba wrote: > Introduce the new KVM capability KVM_CAP_GMEM_MMAP. This capability > signals to userspace that a KVM instance supports host userspace mapping > of guest_memfd-backed memory. > > The availability of this capability is determined per architecture, and > its enablement for a specific guest_memfd instance is controlled by the > GUEST_MEMFD_FLAG_MMAP flag at creation time. > > Update the KVM API documentation to detail the KVM_CAP_GMEM_MMAP > capability, the associated GUEST_MEMFD_FLAG_MMAP, and provide essential > information regarding support for mmap in guest_memfd. > > Reviewed-by: David Hildenbrand > Reviewed-by: Gavin Shan > Signed-off-by: Fuad Tabba > --- > Documentation/virt/kvm/api.rst | 9 +++++++++ > include/uapi/linux/kvm.h | 1 + > virt/kvm/kvm_main.c | 4 ++++ > 3 files changed, 14 insertions(+) > > diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst > index 9abf93ee5f65..70261e189162 100644 > --- a/Documentation/virt/kvm/api.rst > +++ b/Documentation/virt/kvm/api.rst > @@ -6407,6 +6407,15 @@ most one mapping per page, i.e. binding multiple memory regions to a single > guest_memfd range is not allowed (any number of memory regions can be bound to > a single guest_memfd file, but the bound ranges must not overlap). > > +When the capability KVM_CAP_GMEM_MMAP is supported, the 'flags' field supports > +GUEST_MEMFD_FLAG_MMAP. Setting this flag on guest_memfd creation enables mmap() > +and faulting of guest_memfd memory to host userspace. > + > +When the KVM MMU performs a PFN lookup to service a guest fault and the backing > +guest_memfd has the GUEST_MEMFD_FLAG_MMAP set, then the fault will always be > +consumed from guest_memfd, regardless of whether it is a shared or a private > +fault. > + > See KVM_SET_USER_MEMORY_REGION2 for additional details. > > 4.143 KVM_PRE_FAULT_MEMORY > diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h > index c71348db818f..cbf28237af79 100644 > --- a/include/uapi/linux/kvm.h > +++ b/include/uapi/linux/kvm.h > @@ -956,6 +956,7 @@ struct kvm_enable_cap { > #define KVM_CAP_ARM_EL2 240 > #define KVM_CAP_ARM_EL2_E2H0 241 > #define KVM_CAP_RISCV_MP_STATE_RESET 242 > +#define KVM_CAP_GMEM_MMAP 243 > > struct kvm_irq_routing_irqchip { > __u32 irqchip; > diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c > index 81bb18fa8655..5463e81b08b9 100644 > --- a/virt/kvm/kvm_main.c > +++ b/virt/kvm/kvm_main.c > @@ -4913,6 +4913,10 @@ static int kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg) > #ifdef CONFIG_KVM_GMEM > case KVM_CAP_GUEST_MEMFD: > return !kvm || kvm_arch_supports_gmem(kvm); > +#endif > +#ifdef CONFIG_KVM_GMEM_SUPPORTS_MMAP > + case KVM_CAP_GMEM_MMAP: > + return !kvm || kvm_arch_supports_gmem_mmap(kvm); > #endif > default: > break; Reviewed-by: Shivank Garg