* [PATCH] xen/x86: Initialize per_cpu(xen_vcpu, 0) a little earlier
@ 2016-10-02 22:45 Boris Ostrovsky
2016-10-03 8:43 ` Sander Eikelenboom
2016-10-05 9:44 ` [Xen-devel] " David Vrabel
0 siblings, 2 replies; 3+ messages in thread
From: Boris Ostrovsky @ 2016-10-02 22:45 UTC (permalink / raw)
To: david.vrabel, jgross; +Cc: xen-devel, linux-kernel, linux, Boris Ostrovsky
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.
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;
--
1.8.3.1
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] xen/x86: Initialize per_cpu(xen_vcpu, 0) a little earlier
2016-10-02 22:45 [PATCH] xen/x86: Initialize per_cpu(xen_vcpu, 0) a little earlier Boris Ostrovsky
@ 2016-10-03 8:43 ` Sander Eikelenboom
2016-10-05 9:44 ` [Xen-devel] " David Vrabel
1 sibling, 0 replies; 3+ messages in thread
From: Sander Eikelenboom @ 2016-10-03 8:43 UTC (permalink / raw)
To: Boris Ostrovsky; +Cc: david.vrabel, jgross, xen-devel, linux-kernel
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;
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Xen-devel] [PATCH] xen/x86: Initialize per_cpu(xen_vcpu, 0) a little earlier
2016-10-02 22:45 [PATCH] xen/x86: Initialize per_cpu(xen_vcpu, 0) a little earlier Boris Ostrovsky
2016-10-03 8:43 ` Sander Eikelenboom
@ 2016-10-05 9:44 ` David Vrabel
1 sibling, 0 replies; 3+ messages in thread
From: David Vrabel @ 2016-10-05 9:44 UTC (permalink / raw)
To: Boris Ostrovsky, david.vrabel, jgross; +Cc: linux, linux-kernel, xen-devel
On 02/10/16 23:45, 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.
Applied to for-linus-4.9, thanks.
David
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2016-10-05 9:48 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2016-10-02 22:45 [PATCH] xen/x86: Initialize per_cpu(xen_vcpu, 0) a little earlier Boris Ostrovsky
2016-10-03 8:43 ` Sander Eikelenboom
2016-10-05 9:44 ` [Xen-devel] " David Vrabel
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