linux-kernel - Re: [PATCH 1/2] mm, Make __get_user_pages return -EHWPOISON for HWPOISON page optionally

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Message-ID: <4D2ED737.6050802@redhat.com>
Date:	Thu, 13 Jan 2011 12:43:03 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Huang Ying <ying.huang@...el.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>,
	Tony Luck <tony.luck@...el.com>,
	Dean Nelson <dnelson@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/2] mm, Make __get_user_pages return -EHWPOISON for HWPOISON
 page optionally

On 01/13/2011 10:42 AM, Huang Ying wrote:
> Make __get_user_pages return -EHWPOISON for HWPOISON page only if
> FOLL_HWPOISON is specified.  With this patch, the interested callers
> can distinguish HWPOISON page from general FAULT page, while other
> callers will still get -EFAULT for pages, so the user space interface
> need not to be changed.
>
> get_user_pages_hwpoison is added as a variant of get_user_pages that
> can return -EHWPOISON for HWPOISON page.
>
> This feature is needed by KVM, where UCR MCE should be relayed to
> guest for HWPOISON page, while instruction emulation and MMIO will be
> tried for general FAULT page.
>
> The idea comes from Andrew Morton.
>
> Signed-off-by: Huang Ying<ying.huang@...el.com>
> Cc: Andrew Morton<akpm@...ux-foundation.org>
>
> +#ifdef CONFIG_MEMORY_FAILURE
> +int get_user_pages_hwpoison(struct task_struct *tsk, struct mm_struct *mm,
> +			    unsigned long start, int nr_pages, int write,
> +			    int force, struct page **pages,
> +			    struct vm_area_struct **vmas);
> +#else

Since we'd also like to add get_user_pages_noio(), perhaps adding a 
flags field to get_user_pages() is better.

-- 
error compiling committee.c: too many arguments to function

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