Guruprasad Swaminathan, Chennai
2008-May-29 08:24 UTC
[Xen-community] PCI Single Root IO Virtualization
Hi all, I am enclosing with this mail the specification document of the PCI-SIG for Single Root I/O Virtualization. I read the PCI SIG specification document for SR-IOV. The document described about how any I/O request in a machine with SR-IOV coming from the virtual machine bypasses the hypervisor and is handled directly by the device. The document also describes a software layer in hypervisor known as PCI-Manager which will configure the virtual functions to handle the I/O requests of the VMs. The I/O requests of the virtual machines will be processed faster as the hypervisor will not be involved during the transactions. But the document does not explain about how actually the I/O requests are handled by the virtual functions in the device that are responsible for handling the requests. Nor does it describe about the role of the device drivers (which are present in the Dom0) during the I/O requests and how I/O requests can happen without the involvement of the device drivers. Besides, the actual data flow from domU''s to dom0 and the role of the PCIM during data transfer is also unclear. Can anybody help us in understanding the same ? Thanks and regards, S.GURU PRASAD DISCLAIMER: ----------------------------------------------------------------------------------------------------------------------- The contents of this e-mail and any attachment(s) are confidential and intended for the named recipient(s) only. It shall not attach any liability on the originator or HCL or its affiliates. Any views or opinions presented in this email are solely those of the author and may not necessarily reflect the opinions of HCL or its affiliates. Any form of reproduction, dissemination, copying, disclosure, modification, distribution and / or publication of this message without the prior written consent of the author of this e-mail is strictly prohibited. If you have received this email in error please delete it and notify the sender immediately. Before opening any mail and attachments please check them for viruses and defect. ----------------------------------------------------------------------------------------------------------------------- _______________________________________________ Xen-community mailing list Xen-community@lists.xensource.com http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-community
Guruprasad Swaminathan, Chennai
2008-May-29 09:37 UTC
[Xen-community] PCI Single Root IO Virtualization
Hi all, I read the PCI SIG specification document for SR-IOV. The document described about how any I/O request in a machine with SR-IOV coming from the virtual machine bypasses the hypervisor and is handled directly by the device. The document also describes a software layer in hypervisor known as PCI-Manager which will configure the virtual functions to handle the I/O requests of the VMs. The I/O requests of the virtual machines will be processed faster as the hypervisor will not be involved during the transactions. But the document does not explain about how actually the I/O requests are handled by the virtual functions in the device that are responsible for handling the requests. Nor does it describe about the role of the device drivers (which are present in the Dom0) during the I/O requests and how I/O requests can happen without the involvement of the device drivers. Besides, the actual data flow from domU''s to dom0 and the role of the PCIM during data transfer is also unclear. Can anybody help us in understanding the same ? Thanks and regards, S.GURU PRASAD DISCLAIMER: ----------------------------------------------------------------------------------------------------------------------- The contents of this e-mail and any attachment(s) are confidential and intended for the named recipient(s) only. It shall not attach any liability on the originator or HCL or its affiliates. Any views or opinions presented in this email are solely those of the author and may not necessarily reflect the opinions of HCL or its affiliates. Any form of reproduction, dissemination, copying, disclosure, modification, distribution and / or publication of this message without the prior written consent of the author of this e-mail is strictly prohibited. If you have received this email in error please delete it and notify the sender immediately. Before opening any mail and attachments please check them for viruses and defect. ----------------------------------------------------------------------------------------------------------------------- _______________________________________________ Xen-community mailing list Xen-community@lists.xensource.com http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-community