Configuration snooping bridge

1. A method, comprising:

identifying, by a processing device of a bridge in a computing system, an initialization message of a central processing unit (CPU) for a device, the device being connected to a secondary interface of the bridge;

identifying, by the processing device, a device response to the initialization message;

determining, by the processing device, an address range for the device in view of the initialization message and the device response;

storing the address range for the device in a list in the bridge; and

enabling, by the processing device, access to the device in view of the list in the bridge before the bridge receives a system list from the CPU.

2. The method of claim 1 further comprising:

identifying a memory transaction to access the device; and

causing the memory transaction to be forwarded to the address of the device.

3. The method of claim 1 , wherein the initialization message is from one of an operating system or a Basic Input/Output System (BIOS) of the computing system.

4. The method of claim 1 , wherein the bridge connects a first Peripheral Component Interconnect (PCI) bus to a second PCI bus, wherein the device response comprises a request for a size of an address range for the device, the method further comprising:

identifying a first address of the address range for the device from the initialization message.

5. The method of claim 1 , wherein the device is a virtual device emulated by a hypervisor.

6. The method of claim 1 , wherein the bridge is a virtual bridge emulated by a hypervisor.

7. The method of claim 1 , wherein the device is a virtual device within a virtual machine running on a hypervisor in a virtual environment, the hypervisor having access to a physical device, the physical device having an address that corresponds to a host operating system, wherein determining, by the bridge, the address for the device in view of the device response comprises:

creating a translation table that translates the address of the virtual device in a guest operating system to the address of the physical device on the host operating system.

8. The method of claim 1 , wherein the list comprises address ranges for a plurality of devices, the method further comprising:

identifying a memory transaction to access the device; and

causing the memory transaction to be forwarded to an address of the device using the list.

9. An apparatus, comprising:

a memory; and

a processing device, operatively coupled with the memory, to:

identify an initialization message for a device, the device being connected to a secondary interface of a bridge;

identify a device response to the initialization message;

determine an address range for the device in view of the initialization message and the device response;

store the address range for the device in a list in the bridge; and

enable access to the device in view of the list in the bridge before the bridge receives a system list from the CPU.

10. The apparatus of claim 9 , the processing device further to:

identify a memory transaction to access the device, and

cause the memory transaction to be forwarded to the address of the device.

11. The apparatus of claim 9 , wherein the bridge connects a first Peripheral Component Interconnect (PCI) bus to a second PCI bus, wherein the device response comprises a request for a size of an address range for the device, and wherein the processing device further to:

identify a first address of the address range for the device from the initialization message.

12. The apparatus of claim 9 , wherein the device is a virtual device emulated by a hypervisor, and the bridge is a virtual bridge emulated by the hypervisor.

13. The apparatus of claim 9 , wherein the device is a virtual device within a virtual machine running on a hypervisor in a virtual environment, the hypervisor having access to a physical device, the physical device having an address that corresponds to a host operating system, wherein to determine the address for the device in view of the device response, the processing device is to:

create a translation table that translates the address of the virtual device in the a operating system to the address of the physical device on the host operating system.

14. The apparatus of claim 9 , wherein the list comprises address ranges for a plurality of devices, wherein the processing device further to:

identify a memory transaction to access the device; and

cause the memory transaction to be forwarded to an address of the device using the list.

15. A non-transitory computer readable storage medium including instructions that, when executed by a processing device of a bridge, cause the processing device to:

identify an initialization message of a central processing unit (CPU) for a device, the device being connected to a secondary interface of the bridge;

identify, by the processing device of the bridge, a device response to the initialization message;

determine, by the processing device of the bridge, an address range for the device in view of the initialization message and the device response;

store the address range for the device in a list in the bridge; and

enable access to the device in view of the list in the bridge before the bridge receives a system list from the CPU.

16. The non-transitory computer readable storage medium of claim 15 , the processing device further to:

identify a memory transaction to access the device; and

cause the memory transaction to be forwarded to the address of the device.

17. The non-transitory computer readable storage medium of claim 15 , wherein the bridge connects a first Peripheral Component Interconnect (PCI) bus to a second PCI bus, wherein the device response comprises a request for a size of an address range for the device, the processing device further to:

identify a first address of the address range for the device from the initialization message.

18. The non-transitory computer readable storage medium of claim 15 , wherein the device is a virtual device emulated by a hypervisor, and the bridge is a virtual bridge emulated by the hypervisor.

19. The non-transitory computer readable storage medium of claim 15 , wherein the device is a virtual device within a virtual machine running on a hypervisor in a virtual environment, the hypervisor having access to a physical device, the physical device having an address that corresponds to a host operating system, wherein to determine the address for the device in view of the device response, the processing device is to create a translation table that translates the address of the virtual device in a guest operating system to the address of the physical device on the host operating system.

20. The non-transitory computer readable storage medium of claim 15 , wherein the list comprises address ranges for a plurality of devices, the processing device further to:

identify a memory transaction to access the device; and

cause the memory transaction to be forwarded to an address of the device using the list.