Re: [Xen-devel] [PATCH] x86/hvmloader: align BAR position to 4K

[Jason Andryuk <jandryuk@xxxxxxxxx>]

On Tue, Jan 14, 2020 at 1:16 PM Roger Pau Monne <roger.pau@xxxxxxxxxx> wrote:
>
> When placing BARs with sizes smaller than 4K multiple BARs can end
> up mapped to the same guest physical address, and thus won't work
> correctly.
>
> Align all BARs placement to 4K in hvmloader to prevent such
> overlapping.
>
> Note that the guest can still move the BARs around and create this
> collisions, and that BARs not filling up a physical page might leak
> access to other MMIO regions placed in the same host physical page.
>
> This is however no worse than what's currently done, and hence should
> be considered an improvement over the current state.
>
> Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>

Tested-by: Jason Andryuk <jandryuk@xxxxxxxxx>

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