linux-kernel - Re: [PATCH] xen: disable ACPI NUMA for PV guests

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Date:	Mon, 13 Dec 2010 23:17:38 +0100
From:	Vincent Caron <vcaron@...rstech.com>
To:	Ian Campbell <ian.campbell@...rix.com>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	xen-devel@...ts.xensource.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] xen: disable ACPI NUMA for PV guests

On Fri, 2010-12-03 at 09:54 +0000, Ian Campbell wrote:
> Xen does not currently expose PV-NUMA information to PV
> guests. Therefore disable NUMA for the time being to prevent the
> kernel picking up on an host-level NUMA information which it might
> come across in the firmware.
> 
> Signed-off-by: Ian Campbell <ian.campbell@...rix.com>
> ---
>  arch/x86/xen/enlighten.c |    4 ++++
>  1 files changed, 4 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
> index fbb35cd..7cdf2f3 100644
> --- a/arch/x86/xen/enlighten.c
> +++ b/arch/x86/xen/enlighten.c
> @@ -1195,6 +1195,10 @@ asmlinkage void __init xen_start_kernel(void)
>  
>  	xen_smp_init();
>  
> +#ifdef CONFIG_ACPI_NUMA
> +	acpi_numa = -1;
> +#endif
> +
>  	pgd = (pgd_t *)xen_start_info->pt_base;
>  
>  	__supported_pte_mask |= _PAGE_IOMAP;

  This made it thru 2.6.32-29 in Debian on 10 dec and works like a
charm, Dell R410 properly booting with hypervisor Xen 4.0.1.

  Thanks a lot for your help and responsiveness.


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