linux-kernel - Re: [PATCH 02/11] Add "handle page fault" PV helper.

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Message-ID: <20091102092214.GB8933@elte.hu>
Date:	Mon, 2 Nov 2009 10:22:14 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Gleb Natapov <gleb@...hat.com>
Cc:	kvm@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 02/11] Add "handle page fault" PV helper.


* Gleb Natapov <gleb@...hat.com> wrote:

> diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
> index f4cee90..14707dc 100644
> --- a/arch/x86/mm/fault.c
> +++ b/arch/x86/mm/fault.c
> @@ -952,6 +952,9 @@ do_page_fault(struct pt_regs *regs, unsigned long error_code)
>  	int write;
>  	int fault;
>  
> +	if (arch_handle_page_fault(regs, error_code))
> +		return;
> +

This patch is not acceptable unless it's done cleaner. Currently we 
already have 3 callbacks in do_page_fault() (kmemcheck, mmiotrace, 
notifier), and this adds a fourth one. Please consolidate them into a 
single callback site, this is a hotpath on x86.

And please always Cc: the x86 maintainers to patches that touch x86 
code.

	Ingo
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