Re: [Xen-devel] [PATCH v4] hw/passthrough: Prevent QEMU from mapping PCI option ROM at address 0

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 12.05.14 at 17:36, <malcolm.crossley@xxxxxxxxxx> wrote:
> The PCI option ROM BAR uses the LSB to indicate if the BAR is enabled.
> The AMD graphics driver sets the address bit's of the BAR to 0 but leaves 
> the
> LSB set to 1. Whilst this is not good practice, QEMU should be ignoring the
> non address parts of the BAR.

All you say above only warrants the PCI defined bits to be masked
off, ...

> This patch adds masking of the bits 0-11 (4k page) parts of the BAR
> before comparing the address to 0.

... i.e. 0-10 (2k).

Jan


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