[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20180717112029.42378-7-kirill.shutemov@linux.intel.com>
Date: Tue, 17 Jul 2018 14:20:16 +0300
From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To: Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>,
Tom Lendacky <thomas.lendacky@....com>
Cc: Dave Hansen <dave.hansen@...el.com>,
Kai Huang <kai.huang@...ux.intel.com>,
Jacob Pan <jacob.jun.pan@...ux.intel.com>,
linux-kernel@...r.kernel.org, linux-mm@...ck.org,
"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCHv5 06/19] mm/khugepaged: Handle encrypted pages
khugepaged allocates page in advance, before we found a VMA for
collapse. We don't yet know which KeyID to use for the allocation.
The page is allocated with KeyID-0. Once we know that the VMA is
suitable for collapsing, we prepare the page for KeyID we need, based on
vma_keyid().
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
---
mm/khugepaged.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 5ae34097aed1..d116f4ebb622 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1056,6 +1056,16 @@ static void collapse_huge_page(struct mm_struct *mm,
*/
anon_vma_unlock_write(vma->anon_vma);
+ /*
+ * At this point new_page is allocated as non-encrypted.
+ * If VMA's KeyID is non-zero, we need to prepare it to be encrypted
+ * before coping data.
+ */
+ if (vma_keyid(vma)) {
+ prep_encrypted_page(new_page, HPAGE_PMD_ORDER,
+ vma_keyid(vma), false);
+ }
+
__collapse_huge_page_copy(pte, new_page, vma, address, pte_ptl);
pte_unmap(pte);
__SetPageUptodate(new_page);
--
2.18.0
Powered by blists - more mailing lists