Re: [PATCH v13] PCI: Add device-specific reset for Qualcomm devices

[Jose Ignacio Tornos Martinez <jtornosm@redhat.com>]

Hi Bjorn,

> Ah, so this depends on the previous VM tenant to clean up
> after itself instead of the host kernel enforcing the
> isolation?

That is actually the current situation without this patch, there is no
working reset method, and since it depends on the previous status, the
host cannot enforce isolation at all.

This patch adds a hardware reset that the host uses on every device
reassignment (device-specific reset is position #1 in the reset hierarchy),
regardless of how the previous VM terminated. It improves isolation by
giving the host a real reset mechanism where none exists today.

The clean/unclean distinction was only explaining why things happen to work
today without a reset in some cases, not a limitation of the proposed reset.

Thanks

Best regards
Jose Ignacio