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

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Message-ID: <CAJZ5v0id-035AtyQ_SccPuCxD7+pa6GCgj3WBAojM+rFqssGQQ@mail.gmail.com>
Date:	Sat, 6 Feb 2016 11:23:07 +0100
From:	"Rafael J. Wysocki" <rafael@...nel.org>
To:	Shannon Zhao <zhaoshenglong@...wei.com>
Cc:	"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 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.

Thanks,
Rafael