On Wed, 4 Sep 2019 at 04:20, Anshuman Khandual
wrote:
> On 09/04/2019 06:28 AM, Jia He wrote:
> > @@ -2152,20 +2153,30 @@ static inline void cow_user_page(struct page *dst,
> > struct page *src, unsigned lo
> >*/
> > if (unlikely(!src)) {
> > void *kaddr = kmap_atomic(
On Wed, 4 Sep 2019 at 01:59, Jia He wrote:
> @@ -2152,20 +2153,30 @@ static inline void cow_user_page(struct page *dst,
> struct page *src, unsigned lo
> */
> if (unlikely(!src)) {
> void *kaddr = kmap_atomic(dst);
> - void __user *uaddr = (void __us
Morton ; Matthew Wilcox
>> ; Jérôme Glisse ; Ralph
>> Campbell ; Jason Gunthorpe ;
>> Peter Zijlstra ; Dave Airlie ;
>> Aneesh Kumar K.V ; Thomas Hellstrom
>> ; Souptick Joarder ;
>> linux...@kvack.org; linux-kernel@vger.kernel.org
>> Subject: Re: [PATCH] m
On 09/04/2019 08:49 AM, Anshuman Khandual wrote:
> /*
>* This really shouldn't fail, because the page is there
>* in the page tables. But it might just be unreadable,
>* in which case we just give up and fill the result with
> -
On 09/04/2019 06:28 AM, Jia He wrote:
> When we tested pmdk unit test [1] vmmalloc_fork TEST1 in arm64 guest, there
> will be a double page fault in __copy_from_user_inatomic of cow_user_page.
>
> Below call trace is from arm64 do_page_fault for debugging purpose
> [ 110.016195] Call trace:
> [
When we tested pmdk unit test [1] vmmalloc_fork TEST1 in arm64 guest, there
will be a double page fault in __copy_from_user_inatomic of cow_user_page.
Below call trace is from arm64 do_page_fault for debugging purpose
[ 110.016195] Call trace:
[ 110.016826] do_page_fault+0x5a4/0x690
[ 110.0178
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