Messages in this thread | | | Date | Thu, 13 Jan 2011 12:43:03 +0200 | From | Avi Kivity <> | Subject | Re: [PATCH 1/2] mm, Make __get_user_pages return -EHWPOISON for HWPOISON page optionally |
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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@intel.com> > Cc: Andrew Morton<akpm@linux-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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