2010-12-03 09:54:11

by Ian Campbell

Subject: [PATCH] xen: disable ACPI NUMA for PV guests

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 <[email protected]>
---
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;
--
1.5.6.5

2010-12-13 22:24:34

by Vincent Caron

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 <[email protected]>
> ---
> 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.