Low-latency shared memory channel across address spaces without system call overhead in a computing system

A non-transitory computer readable medium having instructions stored thereon that when executed by a system cause the system to perform operations for communication between a client application and a filesystem server, the operations comprising:

• allocating a first shared memory in a guest virtual address space of the client application, wherein the client application uses addressing of the guest virtual address space to access the first shared memory, wherein the client application executes in a virtual machine (VM) running on a host computer, wherein the host computer runs a hypervisor that provides an execution environment for the VM, wherein the hypervisor comprises the filesystem server configured to provide an interface to a storage of the host computer, wherein the filesystem server operates in a machine address space different than the guest virtual address space;
• creating a shared memory channel between the client application and the filesystem server, the shared memory channel using the first shared memory, wherein the filesystem server uses addressing in the machine address space to access the first shared memory;
• sending authentication information associated with the client application to the filesystem server;
• and
• submitting a command, to access the storage, in the shared memory channel from the client application to the filesystem server, the command including the authentication information.

A computing system, comprising:

• one or more processors;
• and
• at least one memory, the one or more processors and the at least one memory configured to:
• allocate a first shared memory in a guest virtual address space of a client application, wherein the client application uses addressing of the guest virtual address space to access the first shared memory, wherein the client application executes in a virtual machine (VM) running on a host computer, wherein the host computer runs a hypervisor that provides an execution environment for the VM, wherein the hypervisor comprises a filesystem server configured to provide an interface to a storage of the host computer, wherein the filesystem server operates in a machine address space different than the guest virtual address space;
• create a shared memory channel between the client application and the filesystem server, the shared memory channel using the first shared memory, wherein the filesystem server uses addressing in the machine address space to access the first shared memory;
• send authentication information associated with the client application to the filesystem server;
• and
• submit a command, to access the storage, in the shared memory channel from the client application to the filesystem server, the command including the authentication information.