lkml.org 
[lkml]   [2016]   [Oct]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] xen/x86: Initialize per cpu(xen vcpu , 0) a little earlier
On 2016-10-03 00:45, Boris Ostrovsky wrote:
> xen_cpuhp_setup() calls mutex_lock() which, when CONFIG_DEBUG_MUTEXES
> is defined, ends up calling xen_save_fl(). That routine expects
> per_cpu(xen_vcpu, 0) to be already initialized.
>
> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
> Reported-by: Sander Eikelenboom <linux@eikelenboom.it>
> ---
> Sander, please see if this fixes the problem. Thanks.

Hi Boris,

I have tested it and it fixes the dom0 crash in early boot for me.
Thanks again for investigating and the swift fix !

--
Sander


> arch/x86/xen/enlighten.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
> index 366b6ae..96c2dea 100644
> --- a/arch/x86/xen/enlighten.c
> +++ b/arch/x86/xen/enlighten.c
> @@ -1644,7 +1644,6 @@ asmlinkage __visible void __init
> xen_start_kernel(void)
> xen_initial_gdt = &per_cpu(gdt_page, 0);
>
> xen_smp_init();
> - WARN_ON(xen_cpuhp_setup());
>
> #ifdef CONFIG_ACPI_NUMA
> /*
> @@ -1658,6 +1657,8 @@ asmlinkage __visible void __init
> xen_start_kernel(void)
> possible map and a non-dummy shared_info. */
> per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0];
>
> + WARN_ON(xen_cpuhp_setup());
> +
> local_irq_disable();
> early_boot_irqs_disabled = true;

\
 
 \ /
  Last update: 2016-10-03 10:43    [W:0.041 / U:0.056 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site