Messages in this thread | | | Date | Mon, 22 Mar 2021 14:31:20 +0300 | From | "Kirill A. Shutemov" <> | Subject | Re: [PATCH v23 11/28] x86/mm: Update pte_modify for _PAGE_COW |
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On Tue, Mar 16, 2021 at 08:10:37AM -0700, Yu-cheng Yu wrote: > The read-only and Dirty PTE has been used to indicate copy-on-write pages. > However, newer x86 processors also regard a read-only and Dirty PTE as a > shadow stack page. In order to separate the two, the software-defined > _PAGE_COW is created to replace _PAGE_DIRTY for the copy-on-write case, and > pte_*() are updated. > > Pte_modify() changes a PTE to 'newprot', but it doesn't use the pte_*(). > Introduce fixup_dirty_pte(), which sets a dirty PTE, based on _PAGE_RW, > to either _PAGE_DIRTY or _PAGE_COW. > > Apply the same changes to pmd_modify(). > > Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com>
Reviewed-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
-- Kirill A. Shutemov
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