Re: [Xen-devel] [PATCH] xen: arm: Enable 1:1 workaround by default

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Wed, 27 Nov 2013, Ian Campbell wrote:
> On Wed, 2013-11-27 at 12:20 +0000, Andrew Cooper wrote:
> > On 27/11/13 12:19, Ian Campbell wrote:
> > > I was just about to send out patches adding the 1:1 workaround to 
> > > vexpress (the
> > > foundation model is a vexpress platfrom with DMA) and sunxi.
> > >
> > > That would have meant that all platforms now implement the quirk. Instead 
> > > lets
> > > just make it the default and remove the quirk.
> > >
> > > In the future this will likely be set based on the presence absence of an
> > > IOMMU, perhaps with additional overrides by the platform.
> > >
> > > A command line option no-dom0_11_mapping is provided.
> > >
> > > Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
> > 
> > Can you patch docs/misc/xen-command-line.markdown as well please
> 
> I left it out on purpose, given the implications of using it I actually
> want people to have to talk to us before using it.
> 
> I'd be more inclined to remove the option that to document it.

Given that there is no way of using Xen on any ARM hardware without that
option right now (unless the hardware doesn't do DMA at all, but we can
ignore that case), I think that making it a global variable, not exposed
to the user, would be fine. xen/x86 can set the option to false.

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel