Re: [Xen-devel] [PATCH RESEND 1/3] OvmfPkg/XenSupport: remove usage of prefetchable PCI host bridge aperture

[Anthony PERARD <anthony.perard@xxxxxxxxxx>]

Hi,

On Wed, Mar 06, 2019 at 12:40:54PM +0000, Igor Druzhinin wrote:
> This aperture doesn't exist in OVMF and trying to use it causes

I'm trying to understand what you mean by writing "doesn't exist in
OVMF". Are prefetchable BAR not handled by ScanForRootBridges() ?
Or is it the emulation of the config space that isn't correct?
Maybe QEMU should lies about a BAR been prefetchable?

This patch feels like a workaround, but maybe I'm wrong.

Thanks.

> failing assertions later in cases there are prefetchable and
> non-prefetchable BARs following each other. This configuration is
> quite likely with some PCI passthrough devices.

-- 
Anthony PERARD

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