Hello List,
I am trying to read / write to guest page from the host when there is
ept violation on it. From tdp_page_fault() when I have the pfn, this
is what I am doing
struct page *page = pfn_to_page(pfn);
unsigned long addr = page_addrress(page);
unsigned char *buff = (unsigned char*) addr;
copy_to_user(buff, my_own_page, PAGE_SIZE);
or
copy_from_user(my_own_page, buff, PAGE_SIZE);
But in both above case, copy_from/to_user returns PAGE_SIZE indicating
that copying failed. I tried using memcpy instead, but it not able to
copy too.
Is there a way to achieve this ?
Would this work ?
old_fs = get_fs();
set_fs(KERNEL_DS);
...
copy_from/to_user()
set_fs(old_fs);
--
Sunil
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