linux-kernel - Re: [Xen-devel] [PATCH v4 11/14] pnpbios: replace paravirt

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Message-ID: <57062C63.2010609@citrix.com>
Date:	Thu, 7 Apr 2016 10:46:11 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	"Luis R. Rodriguez" <mcgrof@...nel.org>, <bp@...en8.de>,
	<hpa@...or.com>, <tglx@...utronix.de>, <mingo@...hat.com>,
	<rusty@...tcorp.com.au>
CC:	<xen-devel@...ts.xensource.com>, <matt@...eblueprint.co.uk>,
	<andrew.cooper3@...rix.com>, <x86@...nel.org>,
	<linux-kernel@...r.kernel.org>, <luto@...capital.net>,
	<jlee@...e.com>, <lguest@...ts.ozlabs.org>, <glin@...e.com>,
	<david.vrabel@...rix.com>, <boris.ostrovsky@...cle.com>,
	<andriy.shevchenko@...ux.intel.com>
Subject: Re: [Xen-devel] [PATCH v4 11/14] pnpbios: replace paravirt_enabled()
 check with legacy device check

On 07/04/16 01:06, Luis R. Rodriguez wrote:
> Since we are removing paravirt_enabled() replace it with a
> logical equivalent. Even though PNPBIOS is x86 specific we
> add an arch-specific type call, which can be implemented by
> any architecture to show how other legacy attribute devices
> can later be also checked for with other ACPI legacy attribute
> flags.
> 
> This implicates the first ACPI 5.2.9.3 IA-PC Boot Architecture
> ACPI_FADT_LEGACY_DEVICES flag device, and shows how to add more.
[...]
> +struct x86_legacy_devices {
> +	int pnpbios;
> +};

It's not clear why pnpbios needs a new structure and why this structure
of devices does not have the bit for the rtc device.

David