Sharing message-signaled interrupts between peripheral component interconnect (PCI) I/O devices
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United States of America Patent
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Feb 14, 2017
Grant Date -
Oct 22, 2015
app pub date -
Apr 29, 2014
filing date -
Apr 17, 2014
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A PCI function, such as a device driver, may request that additional MSI resources be allocated to an I/O device coupled to a PCI Host Bridge (PHB). However, there may not be any unallocated MSI resource remaining in the PHB. Instead, a hypervisor may request to borrow MSI resources assigned to other PCI functions in the system. For example, the PCI function requesting the additional MSI resources may ask for a certain number of MSI resources for a certain period of time—e.g., a lease. The hypervisor then determines which of the other PCI functions (referred to as a loaning PCI functions) are willing to lend or loan their MSI resources. Once the MSI resources available for lease are known, the hypervisor informs the requesting PCI function of these resources which, in turn, binds the additional MSI resources to the I/O device.
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