Re: [PATCH] powerpc: export debug register save function for KVM

From: Alexander Graf <agraf@suse.de>
To: Bharat Bhushan <r65777@freescale.com>
Cc: <kvm-ppc@vger.kernel.org>, <kvm@vger.kernel.org>,
	<scottwood@freescale.com>, <tiejun.chen@windriver.com>,
	Bharat Bhushan <Bharat.Bhushan@freescale.com>
Subject: Re: [PATCH] powerpc: export debug register save function for KVM
Date: Fri, 10 May 2013 11:15:29 +0200	[thread overview]
Message-ID: <31B4CDB8-CD6D-4F02-8CE7-770D301DE8A3@suse.de> (raw)
In-Reply-To: <1367919653-30414-4-git-send-email-Bharat.Bhushan@freescale.com>

On 07.05.2013, at 11:40, Bharat Bhushan wrote:

> KVM need this function when switching from vcpu to user-space
> thread. My subsequent patch will use this function.
> 
> Signed-off-by: Bharat Bhushan <bharat.bhushan@freescale.com>
> ---
> arch/powerpc/include/asm/switch_to.h |    4 ++++
> arch/powerpc/kernel/process.c        |    3 ++-
> 2 files changed, 6 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/powerpc/include/asm/switch_to.h b/arch/powerpc/include/asm/switch_to.h
> index 200d763..50b357f 100644
> --- a/arch/powerpc/include/asm/switch_to.h
> +++ b/arch/powerpc/include/asm/switch_to.h
> @@ -30,6 +30,10 @@ extern void enable_kernel_spe(void);
> extern void giveup_spe(struct task_struct *);
> extern void load_up_spe(struct task_struct *);
> 
> +#ifdef CONFIG_PPC_ADV_DEBUG_REGS
> +extern void switch_booke_debug_regs(struct thread_struct *new_thread);
> +#endif
> +
> #ifndef CONFIG_SMP
> extern void discard_lazy_cpu_state(void);
> #else
> diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
> index ca89375..a938138 100644
> --- a/arch/powerpc/kernel/process.c
> +++ b/arch/powerpc/kernel/process.c
> @@ -362,12 +362,13 @@ static void prime_debug_regs(struct thread_struct *thread)
>  * debug registers, set the debug registers from the values
>  * stored in the new thread.
>  */
> -static void switch_booke_debug_regs(struct thread_struct *new_thread)
> +void switch_booke_debug_regs(struct thread_struct *new_thread)
> {
> 	if ((current->thread.debug.dbcr0 & DBCR0_IDM)
> 		|| (new_thread->debug.dbcr0 & DBCR0_IDM))
> 			prime_debug_regs(new_thread);
> }
> +EXPORT_SYMBOL(switch_booke_debug_regs);

EXPORT_SYMBOL_GPL

Alex