On Fri, Dec 25, 2015 at 9:43 PM, Zir Blazer <zir_bla...@hotmail.com> wrote:
> In a hypothetical case that I drop such Dual GPU card in a slot attached > to the Chipset, it means that I would get isolation there, but not if > connected to the Processor. Is that correct, too? > I'm not sure how to phrase it differently that I have in my blog post, each interconnect component, whether a root port, switch port, or multifunction device, needs to support ACS or ACS-equivalent isolation to have separate IOMMU groups. Isolation is lost at the furthest upstream device lacking ACS. In your scenario, yes, if the chipset root ports support ACS-equivalent isolation and the switch supports native ACS, then isolation is present through the downstream switch ports. Nvidia GRID cards make use of such switches and when installed into a downstream port supporting isolation, each GPU is exposed within its own IOMMU group. Thanks, Alex
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