Invention Grant
- Patent Title: Zero copy message reception for applications
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Application No.: US17739379Application Date: 2022-05-09
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Publication No.: US11675615B2Publication Date: 2023-06-13
- Inventor: Michael Tsirkin
- Applicant: Red Hat, Inc.
- Applicant Address: US NC Raleigh
- Assignee: Red Hat, Inc.
- Current Assignee: Red Hat, Inc.
- Current Assignee Address: US NC Raleigh
- Agency: K&L Gates LLP
- Main IPC: G06F9/455
- IPC: G06F9/455 ; G06F12/1009 ; G06F3/06

Abstract:
Zero copy message reception for guests is disclosed. For example, a host has a memory, a device with access to device memory addresses, a processor, and a supervisor. An application with access to application memory addresses (AMA) executes on the host. An AMA is mapped to a page table entry (PTE). The application shares access to a first page of memory addressed by the AMA with the device to store data received by the device for the first application, where the first page is mapped as a device memory address of the plurality of device memory addresses. The application later sends a request to disconnect from the device. The supervisor is configured to copy contents of the first page to a second page in the memory after receiving the request to disconnect, and then update the PTE to address the second page instead of the first page.
Public/Granted literature
- US20220261272A1 ZERO COPY MESSAGE RECEPTION FOR APPLICATIONS Public/Granted day:2022-08-18
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