linux-kernel - Re: [PATCH v3 0/3] xen: re-enable booting as Xen PVH guest

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Date:   Mon, 19 Feb 2018 11:27:15 +0100
From:   "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
To:     Juergen Gross <jgross@...e.com>, linux-kernel@...r.kernel.org,
        xen-devel@...ts.xenproject.org, linux-acpi@...r.kernel.org,
        x86@...nel.org
Cc:     lenb@...nel.org, boris.ostrovsky@...cle.com, hpa@...or.com,
        tglx@...utronix.de, mingo@...hat.com
Subject: Re: [PATCH v3 0/3] xen: re-enable booting as Xen PVH guest

On 2/19/2018 11:09 AM, Juergen Gross wrote:
> The Xen PVH boot protocol passes vital information to the kernel via
> a start_info block. One of the data transferred is the physical address
> of the RSDP table.
>
> Unfortunately PVH support in the kernel didn't use that passed address
> for RSDP, but relied on the legacy mechanism searching for the RSDP in
> low memory. After a recent change in Xen putting the RSDP to a higher
> address booting as PVH guest is now failing.
>
> This small series repairs that by passing the RSDP address from the
> start_info block to ACPI handling.
>
> Changes in V3:
> - instead of using a weak function add a function pointer to x86_init
>    for obtaining the RSDP address
>
> Juergen Gross (3):
>    acpi: introduce acpi_arch_get_root_pointer() for getting rsdp address
>    x86/acpi: add a new x86_init_acpi structure to x86_init_ops
>    x86/xen: add pvh specific rsdp address retrieval function
>
>   arch/x86/include/asm/acpi.h     |  7 +++++++
>   arch/x86/include/asm/x86_init.h |  9 +++++++++
>   arch/x86/kernel/x86_init.c      |  5 +++++
>   arch/x86/xen/enlighten_pvh.c    | 14 +++++++++++---
>   drivers/acpi/osl.c              |  5 ++++-
>   include/linux/acpi.h            |  7 +++++++
>   6 files changed, 43 insertions(+), 4 deletions(-)
>
The series is fine by me:

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>