From mboxrd@z Thu Jan 1 00:00:00 1970 From: f4da1594@opayq.com Subject: Delivery Status Notification (Delay) Date: Sun, 11 Jun 2017 06:34:10 -0700 (PDT) Message-ID: <527261183.22381.1497188051637.JavaMail.root@smtp5.opayq.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============0863033454716294125==" Return-path: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" To: xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org --===============0863033454716294125== Content-Type: multipart/report; boundary="f403045fdd92ea5cb10551af415a"; report-type=delivery-status --f403045fdd92ea5cb10551af415a Content-Type: multipart/related; boundary="f403045fdd92ea5d3a0551af415b" --f403045fdd92ea5d3a0551af415b Content-Type: multipart/alternative; boundary="f403045fdd92ea5d3f0551af415c" --f403045fdd92ea5d3f0551af415c Content-Type: text/plain; charset="UTF-8" ** Delivery incomplete ** There was a temporary problem delivering your message to curtiskwong9@gmail.com. Gmail will retry for 23 more hours. You'll be notified if the delivery fails permanently. --f403045fdd92ea5d3f0551af415c Content-Type: text/html; charset="UTF-8"

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Kqxd//nr0wItGxSWrmybODv55deOSa1zBM6YXuHz7basez1tTrMRSnJFoqMVcVJwIADFS9+1E AgAA X-Env-Sender: ian.jackson@eu.citrix.com X-Msg-Ref: server-3.tower-27.messagelabs.com!1497012922!106612077!1 X-Originating-IP: [104.130.215.37] X-SpamReason: No, hits=3D0.5 required=3D7.0 tests=3DBODY_RANDOM_LONG X-StarScan-Received:=20 X-StarScan-Version: 9.4.19; banners=3D-,-,- X-VirusChecked: Checked Message-Id: 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 X-BeenThere: xen-changelog@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: "Change log for Mercurial \(receive only\)" List-Unsubscribe: ,=20 List-Unsubscribe: , List-Post: List-Help: List-Subscribe: ,=20 X-Sender-Domain: xenproject.org X-Spamfilter-host: plato.junkemailfilter.com - http://www.junkemailfilter.c= om X-Key-ID: ZjRkYTE1OTRAb3BheXEuY29tIHhlbi1jaGFuZ2Vsb2ctYm91bmNlc0BsaXN0cy54Z= 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(https= ://dnt.abine.com/#help/faq/faq-whataremaskedemails). IF THIS IS SPAM, CLICK HERE TO BLOCK: https://dnt.abine.com/#/block_email/f4da1594@opayq.com/FWD-737QHYSMHVAYQAUC= AOIQBDAAGAQLMA2YAMHECCJDLIBAYAWYAKIAZAQHSMCCWMBLIA4UANQUEIGCIMBKMAZUZ4AAEAA= CA=3D=3D=3D@opayq.com Want to shop safely and privately online? Go Premium: https://dnt.abine.com= /?pk_campaign=3DmaskHeader#premium -------------------------by Abine------------------------- commit 726b737574a3c075be95440e572b317a39293a9e Author: Punit Agrawal AuthorDate: Fri May 26 12:14:07 2017 +0100 Commit: Stefano Stabellini 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 Reviewed-by: Stefano Stabellini --- 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 ----- --f403045fdd92ea5cb10551af415a-- --===============0863033454716294125== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Content-Disposition: inline X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KWGVuLWRldmVs IG1haWxpbmcgbGlzdApYZW4tZGV2ZWxAbGlzdHMueGVuLm9yZwpodHRwczovL2xpc3RzLnhlbi5v cmcveGVuLWRldmVsCg== --===============0863033454716294125==--