US 12,596,563 B2Granted

Physical hardware device access via emulation

AssigneeJuniper Networks, Inc.

InventorSundareswaram Pallan Viswanathan

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Abstract

A virtualization system may receive, by a physical hardware device driver of a kernel of a guest OS of the virtualization system and from a process of the guest OS, one or more control messages to control a physical hardware device. The virtualization system may determine, by the physical hardware device driver and based on the second-type physical hardware device address included in the one or more control messages, a first-type physical hardware device address associated with the physical hardware device. The virtualization system may update, by the physical hardware device driver, the one or more control messages to include the first-type physical hardware device address, and may send, by the physical hardware device driver and to an emulated physical hardware device of a hypervisor of a host OS of the virtualization system, the one or more control messages.

Claims20

Dependent claims

A non-transitory computer-readable medium storing a set of instructions, the set of instructions comprising:

one or more instructions that, when executed by one or more processors of a virtualization system, cause the virtualization system to:
receive, by a physical hardware device driver of a kernel of a guest operating system (OS) of the virtualization system and from a process of the guest OS, one or more control messages to control a low pin count (LPC) physical hardware device,
wherein the one or more control messages are peripheral component interconnect express (PCIEe) control messages that include a PCIe address associated with the LPC physical hardware device;
determine, by the physical hardware device driver of the kernel of the guest OS and based on the PCIe address included in the one or more control messages, an LPC address associated with the physical hardware device;
update, by the physical hardware device driver of the kernel of the guest OS, the one or more control messages to include the LPC address;
send, by the physical hardware device driver of the kernel of the guest OS and to an emulated physical hardware device of a hypervisor of a host OS of the virtualization system, the one or more control messages;
receive, by the emulated physical hardware device of the hypervisor of the host OS and from the physical hardware device driver of the guest OS, the one or more control messages;
send, by the emulated physical hardware device of the hypervisor of the host OS and to a hypervisor device driver of the hypervisor of the host OS, the one or more control messages;
and
update, by the hypervisor device driver of the hypervisor of the host OS, the one or more control messages to be LPC control messages that include the LPC address associated with the physical hardware device.

7 more elements

A virtualization system, comprising:

one or more memories;
and
one or more processors to:
receive, by a physical hardware device driver of a kernel of a guest operating system (OS) of the virtualization system and from a process of the guest OS, one or more control messages to control a physical hardware device,
wherein the physical hardware device is a first-type physical hardware device, and
wherein the one or more control messages are second-type physical hardware device control messages that include a second-type physical hardware device address associated with the physical hardware device;
determine, by the physical hardware device driver of the kernel of the guest OS and based on the second-type physical hardware device address included in the one or more control messages, a first-type physical hardware device address associated with the physical hardware device;
update, by the physical hardware device driver of the kernel of the guest OS, the one or more control messages to include the first-type physical hardware device address;
send, by the physical hardware device driver of the kernel of the guest OS and to an emulated physical hardware device of a hypervisor of a host OS of the virtualization system, the one or more control messages;
receive, by the emulated physical hardware device of the hypervisor of the host OS and from the physical hardware device driver of the guest OS, the one or more control messages;
send, by the emulated physical hardware device of the hypervisor of the host OS and to a hypervisor device driver of the hypervisor of the host OS, the one or more control messages;
and
update, by the hypervisor device driver of the hypervisor of the host OS, the one or more control messages to be first-type physical hardware device control messages that include the first-type physical hardware device address associated with the physical hardware device.

10 more elements

A method, comprising:

sending, by a physical hardware device driver of a kernel of a guest operating system (OS) of a virtualization system and to an emulated physical hardware device of a hypervisor of a host OS of the virtualization system, one or more control messages to control a physical hardware device,
wherein the one or more control messages are second-type physical hardware device control messages that include a second-type physical hardware device address associated with the physical hardware device and a first-type physical hardware device address associated with the physical hardware device, and
wherein the physical hardware device is a first-type physical hardware device;
receiving, by the emulated physical hardware device of the hypervisor of the host OS and from the physical hardware device driver of the guest OS, the one or more control messages;
sending, by the emulated physical hardware device of the hypervisor of the host OS and to a hypervisor device driver of the hypervisor of the host OS, the one or more control messages;
updating, by the hypervisor device driver of the hypervisor of the host OS, the one or more control messages to be first-type physical hardware device control messages that include the first-type physical hardware device address associated with the physical hardware device;
sending, by the hypervisor device driver of the hypervisor of the host OS, to a kernel device driver of a kernel of the host OS, and based on updating the one or more control messages, the one or more control messages;
receiving, by the kernel device driver of the kernel of the host OS and from the hypervisor device driver of the hypervisor of the host OS, the one or more control messages;
and
sending, by the kernel device driver of the kernel of the host OS and to the physical hardware device, the one or more control messages.

7 more elements

Dependencies are inferred from the claim text.