System and method for one step address translation of graphics addresses in virtualization
A system and method including, in some embodiments, receiving a request for a graphics memory address for an input/output (I/O) device assigned to a virtual machine in a system that supports virtualization, and installing, in a graphics memory translation table, a physical guest graphics memory address to host physical memory address translation.
1. An apparatus comprising:
address translation circuitry to perform translations for a plurality of guests in a virtual execution environment, at least one two-stage translation comprising a first translation of a guest virtual address to a guest physical address and a second translation of the guest physical address to a host physical address, wherein the two-stage translation is used in a direct memory access;
hardware translation table circuitry to store a one-stage mapping of one or more guest virtual addresses associated with a first guest directly to host physical addresses,
wherein the address translation circuitry is to query the hardware translation table circuitry to determine if an entry exists for a first guest virtual address to determine a first host physical address;
wherein the virtual execution environment comprises a virtual machine monitor (VMM) to control access by each guest to processing resources; and
an input/output (I/O) interface to couple a first I/O device to the address translation circuitry, wherein at least the first guest is to be associated with the first I/O device.
2. The apparatus of claim 1 , further comprising:
memory management circuitry comprising the address translation circuitry, the memory management circuitry to allocate a region of system memory to the first guest.
3. The apparatus of claim 1 , further comprising:
a processor to execute instructions to implement the virtual execution environment.
4. The apparatus of claim 3 , wherein the processor comprises a central processing unit (CPU).
5. The apparatus of claim 4 , further comprising:
a graphics processor to perform graphics processing functions coupled to the CPU.
6. The apparatus of claim 5 , wherein the guest virtual address comprises a graphics virtual address.
7. The apparatus of claim 1 , wherein the first I/O device comprises a network controller.
8. The apparatus of claim 1 , wherein the first I/O device comprises a storage device.
9. The apparatus of claim 1 , wherein the first I/O device comprises a graphics device.
10. The apparatus of claim 1 , wherein the address translation circuitry further comprises security circuitry to prevent a second guest from accessing a first host physical address associated with the first guest.