linux-kernel - Re: [PATCH v4 01/17] Xen: ACPI: Hide UART used by Xen

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Message-ID: <alpine.DEB.2.02.1602081054350.27008@kaball.uk.xensource.com>
Date:	Mon, 8 Feb 2016 10:57:01 +0000
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	"Rafael J. Wysocki" <rafael@...nel.org>
CC:	Shannon Zhao <zhaoshenglong@...wei.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	<ard.biesheuvel@...aro.org>, <stefano.stabellini@...rix.com>,
	<david.vrabel@...rix.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Mark Rutland <mark.rutland@....com>, <julien.grall@...rix.com>,
	<xen-devel@...ts.xen.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	<linux-efi@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	<ian.campbell@...rix.com>, Shannon Zhao <shannon.zhao@...aro.org>,
	<peter.huangpeng@...wei.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <lenb@...nel.org>,
	"open list:ACPI" <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH v4 01/17] Xen: ACPI: Hide UART used by Xen

On Sat, 6 Feb 2016, Rafael J. Wysocki wrote:
> On Fri, Feb 5, 2016 at 4:05 AM, Shannon Zhao <zhaoshenglong@...wei.com> wrote:
> > From: Shannon Zhao <shannon.zhao@...aro.org>
> >
> > ACPI 6.0 introduces a new table STAO to list the devices which are used
> > by Xen and can't be used by Dom0. On Xen virtual platforms, the physical
> > UART is used by Xen. So here it hides UART from Dom0.
> >
> > Signed-off-by: Shannon Zhao <shannon.zhao@...aro.org>
> > Reviewed-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
> 
> Well, this doesn't look right to me.
> 
> We need to find a nicer way to achieve what you want.

I take that you are talking about how to honor the STAO table in Linux.
Do you have any concrete suggestions?