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Message-Id: <E1dJJRi-0000Hy-80@xenbits.xenproject.org>
Date: Fri, 09 Jun 2017 12:55:22 +0000
Subject: [Xen-changelog] [xen master] Avoid excess icache flushes in
	populate_physmap() before domain has been created
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commit 726b737574a3c075be95440e572b317a39293a9e
Author:     Punit Agrawal <punit.agrawal@arm.com>
AuthorDate: Fri May 26 12:14:07 2017 +0100
Commit:     Stefano Stabellini <sstabellini@kernel.org>
CommitDate: Tue Jun 6 11:49:39 2017 -0700

    Avoid excess icache flushes in populate_physmap() before domain has bee=
n created
   =20
    populate_physmap() calls alloc_heap_pages() per requested
    extent. alloc_heap_pages() invalidates the entire icache per
    extent. During domain creation, the icache invalidations can be deffere=
d
    until all the extents have been allocated as there is no risk of
    executing stale instructions from the icache.
   =20
    Introduce a new flag "MEMF_no_icache_flush" to be used to prevent
    alloc_heap_pages() from performing icache maintenance operations. Use
    the flag in populate_physmap() before the domain has been unpaused and
    perform required icache maintenance function at the end of the
    allocation.
   =20
    One concern is the lack of synchronisation around testing for
    "creation_finished". But it seems, in practice the window where it is
    out of sync should be small enough to not matter.
   =20
    Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
    Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
---
 xen/common/memory.c        | 31 ++++++++++++++++++++++---------
 xen/common/page_alloc.c    |  2 +-
 xen/include/asm-x86/page.h |  8 ++++++++
 xen/include/xen/mm.h       |  2 ++
 4 files changed, 33 insertions(+), 10 deletions(-)

diff --git a/xen/common/memory.c b/xen/common/memory.c
index 52879e7..34d2dda 100644
--- a/xen/common/memory.c
+++ b/xen/common/memory.c
@@ -152,16 +152,26 @@ static void populate_physmap(struct memop_args *a)
                             max_order(curr_d)) )
         return;
=20
-    /*
-     * With MEMF_no_tlbflush set, alloc_heap_pages() will ignore
-     * TLB-flushes. After VM creation, this is a security issue (it can
-     * make pages accessible to guest B, when guest A may still have a
-     * cached mapping to them). So we do this only during domain creation,
-     * when the domain itself has not yet been unpaused for the first
-     * time.
-     */
     if ( unlikely(!d->creation_finished) )
+    {
+        /*
+         * With MEMF_no_tlbflush set, alloc_heap_pages() will ignore
+         * TLB-flushes. After VM creation, this is a security issue (it ca=
n
+         * make pages accessible to guest B, when guest A may still have a
+         * cached mapping to them). So we do this only during domain creat=
ion,
+         * when the domain itself has not yet been unpaused for the first
+         * time.
+         */
         a->memflags |=3D MEMF_no_tlbflush;
+        /*
+         * With MEMF_no_icache_flush, alloc_heap_pages() will skip
+         * performing icache flushes. We do it only before domain
+         * creation as once the domain is running there is a danger of
+         * executing instructions from stale caches if icache flush is
+         * delayed.
+         */
+        a->memflags |=3D MEMF_no_icache_flush;
+    }
=20
     for ( i =3D a->nr_done; i < a->nr_extents; i++ )
     {
@@ -211,7 +221,6 @@ static void populate_physmap(struct memop_args *a)
                 }
=20
                 mfn =3D gpfn;
-                page =3D mfn_to_page(mfn);
             }
             else
             {
@@ -255,6 +264,10 @@ static void populate_physmap(struct memop_args *a)
 out:
     if ( need_tlb
----- Message truncated -----

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