Hi,
I am trying to obtain the physical address translation of a virtual address
after a page fault is handled in the kernel.
I have added the 3 lines following this sentence after the __do_page_fault call
in the do_page_fault function in arch/arm64/mm/fault.c in the linux sources
provided here (https://github.com/gem5/linux-arm-gem5.git).
vma = find_vma(mm, addr);
phy_pg = follow_page(vma, addr, FOLL_NOWAIT);
phy_addr = (unsigned long long) page_to_phys(phy_pg);
show_pte(mm, addr);
The problem is follow-page always returns NULL, meaning it couldn't find the
page table entry for that virtual address. The show_pte confirms this as it
shows that pte value is 0.
Now when I put these modifications in the sources of a linux kernel to run in
qemu I actually get values for pte, and thus a non-NULL value for follow_page,
at each resolution of a major page fault, which is what one would expect.
Is there something special in how gem5's ARM model handles page faults?
Thanks,
-Zaid
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