linux-kernel - Re: [Xen-devel] [PATCH 3/3] x86/xen: use guest_late

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Message-ID: <b061d8fd-d4ed-7334-d4d8-16fed2e4b306@oracle.com>
Date:   Wed, 8 Nov 2017 09:24:20 -0500
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Juergen Gross <jgross@...e.com>, Jan Beulich <JBeulich@...e.com>
Cc:     len.brown@...el.com, x86@...nel.org, tglx@...utronix.de,
        xen-devel@...ts.xenproject.org, mingo@...hat.com,
        pbonzini@...hat.com, rkrcmar@...hat.com, rjw@...ysocki.net,
        pavel@....cz, kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        hpa@...or.com
Subject: Re: [Xen-devel] [PATCH 3/3] x86/xen: use guest_late_init to detect
 Xen PVH guest

On 11/08/2017 09:17 AM, Juergen Gross wrote:
> On 08/11/17 15:10, Boris Ostrovsky wrote:
>> On 11/08/2017 08:36 AM, Juergen Gross wrote:
>>> Regarding ACPI tables: current PVH implementation in Linux kernel
>>> seems not to make use of the special information presented in the boot
>>> information block.
>> It will need to do so for dom0 (and, then, for simplicity, for all PVH
>> guests).
> What about: for all PVH guests booted via the PVH specific boot entry?
> A guest booted via the default boot entry won't know it is PVH until
> ACPI tables have been scanned.

Right. Guest booted from default entry will have to discover RSDP in the
usual way.

-boris