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.
-----------------------------------------------------------------------------------------------------------------------
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.
-----------------------------------------------------------------------------------------------------------------------