linux-kernel - Re: [PATCH 20/31] mips/kvm: Hook into TLB fault handlers.

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Message-ID: <51B26E02.8070802@cogentembedded.com>
Date:	Sat, 08 Jun 2013 03:34:26 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	David Daney <ddaney.cavm@...il.com>
CC:	linux-mips@...ux-mips.org, ralf@...ux-mips.org,
	kvm@...r.kernel.org, Sanjay Lal <sanjayl@...asys.com>,
	linux-kernel@...r.kernel.org, David Daney <david.daney@...ium.com>
Subject: Re: [PATCH 20/31] mips/kvm: Hook into TLB fault handlers.

Hello.

On 06/08/2013 03:03 AM, David Daney wrote:

> From: David Daney <david.daney@...ium.com>
>
> If the CPU is operating in guest mode when a TLB related excpetion
> occurs, give KVM a chance to do emulation.
>
> Signed-off-by: David Daney <david.daney@...ium.com>
> ---
>   arch/mips/mm/fault.c       | 8 ++++++++
>   arch/mips/mm/tlbex-fault.S | 6 ++++++
>   2 files changed, 14 insertions(+)
>
> diff --git a/arch/mips/mm/fault.c b/arch/mips/mm/fault.c
> index 0fead53..9391da49 100644
> --- a/arch/mips/mm/fault.c
> +++ b/arch/mips/mm/fault.c
[...]
> @@ -50,6 +51,13 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs, unsigned long writ
>   	       field, regs->cp0_epc);
>   #endif
>   
> +#ifdef CONFIG_KVM_MIPSVZ
> +	if (test_tsk_thread_flag(current, TIF_GUESTMODE)) {
> +		if (mipsvz_page_fault(regs, write, address))

    Any reason not to collapse these into single *if*?

> +			return;
> +	}
> +#endif
> +
>

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