diff options
Diffstat (limited to 'main/xen/0002-x86-mm-Always-set-_PAGE_ACCESSED-on-L4e-updates.patch')
| -rw-r--r-- | main/xen/0002-x86-mm-Always-set-_PAGE_ACCESSED-on-L4e-updates.patch | 46 |
1 files changed, 0 insertions, 46 deletions
diff --git a/main/xen/0002-x86-mm-Always-set-_PAGE_ACCESSED-on-L4e-updates.patch b/main/xen/0002-x86-mm-Always-set-_PAGE_ACCESSED-on-L4e-updates.patch deleted file mode 100644 index 232260bb36..0000000000 --- a/main/xen/0002-x86-mm-Always-set-_PAGE_ACCESSED-on-L4e-updates.patch +++ /dev/null @@ -1,46 +0,0 @@ -From 344da8f57f442be289bb3c09defb28758b227542 Mon Sep 17 00:00:00 2001 -From: Andrew Cooper <andrew.cooper3@citrix.com> -Date: Wed, 17 Jan 2018 17:04:59 +0100 -Subject: [PATCH 2/4] x86/mm: Always set _PAGE_ACCESSED on L4e updates - -Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> -Reviewed-by: Jan Beulich <jbeulich@suse.com> -master commit: bd61fe94bee0556bc2f64999a4a8315b93f90f21 -master date: 2018-01-15 13:53:16 +0000 -(cherry picked from commit 87ea7816247090e8e5bc5653b16c412943a058b5) ---- - xen/arch/x86/mm.c | 14 +++++++++++++- - 1 file changed, 13 insertions(+), 1 deletion(-) - -diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c -index e77574f92b..981458907f 100644 ---- a/xen/arch/x86/mm.c -+++ b/xen/arch/x86/mm.c -@@ -1322,11 +1322,23 @@ get_page_from_l4e( - _PAGE_USER|_PAGE_RW); \ - } while ( 0 ) - -+/* -+ * When shadowing an L4 behind the guests back (e.g. for per-pcpu -+ * purposes), we cannot efficiently sync access bit updates from hardware -+ * (on the shadow tables) back into the guest view. -+ * -+ * We therefore unconditionally set _PAGE_ACCESSED even in the guests -+ * view. This will appear to the guest as a CPU which proactively pulls -+ * all valid L4e's into its TLB, which is compatible with the x86 ABI. -+ * -+ * At the time of writing, all PV guests set the access bit anyway, so -+ * this is no actual change in their behaviour. -+ */ - #define adjust_guest_l4e(pl4e, d) \ - do { \ - if ( likely(l4e_get_flags((pl4e)) & _PAGE_PRESENT) && \ - likely(!is_pv_32bit_domain(d)) ) \ -- l4e_add_flags((pl4e), _PAGE_USER); \ -+ l4e_add_flags((pl4e), _PAGE_USER | _PAGE_ACCESSED); \ - } while ( 0 ) - - #define unadjust_guest_l3e(pl3e, d) \ --- -2.15.0 - |