linux-kernel - Re: [Xen-devel] [PATCH 1/3] x86/boot: add acpi rsdp address to setup

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Message-ID: <20171128100702.ruegydc6grrbxuvc@MacBook-Pro-de-Roger.local>
Date:   Tue, 28 Nov 2017 10:07:02 +0000
From:   Roger Pau Monné <roger.pau@...rix.com>
To:     Juergen Gross <jgross@...e.com>
CC:     <linux-kernel@...r.kernel.org>, <xen-devel@...ts.xenproject.org>,
        <x86@...nel.org>, <corbet@....net>, <rjw@...ysocki.net>,
        <linux-acpi@...r.kernel.org>, <mingo@...hat.com>, <hpa@...or.com>,
        <boris.ostrovsky@...cle.com>, <tglx@...utronix.de>,
        <lenb@...nel.org>
Subject: Re: [Xen-devel] [PATCH 1/3] x86/boot: add acpi rsdp address to
 setup_header

On Tue, Nov 28, 2017 at 10:43:58AM +0100, Juergen Gross wrote:
> Xen PVH guests receive the address of the RSDP table from Xen. In order
> to support booting a Xen PVH guest via grub2 using the standard x86
> boot entry we need a way fro grub2 to pass the RSDP address to the
> kernel.
> 
> For this purpose expand the struct setup_header to hold the physical
> address of the RSDP address. Being zero means it isn't specified and
> has to be located the legacy way (searching through low memory or
> EBDA).
> 
> Signed-off-by: Juergen Gross <jgross@...e.com>

Reviewed-by: Roger Pau Monné <roger.pau@...rix.com>

Thanks, Roger.