From: "Jan Beulich" <JBeulich@suse.com>
To: xen-devel <xen-devel@lists.xenproject.org>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Subject: [PATCH v2 0/7] x86: Meltdown band-aid overhead reduction
Date: Wed, 07 Feb 2018 09:05:35 -0700 [thread overview]
Message-ID: <5A7B31DF02000078001A61F9@prv-mh.provo.novell.com> (raw)
1: slightly reduce Meltdown band-aid overhead
2: remove CR reads from exit-to-guest path
3: introduce altinstruction_nop assembler macro
4: NOP out most XPTI entry/exit code when it's not in use
5: avoid double CR3 reload when switching to guest user mode
6: disable XPTI when RDCL_NO
7: x86: log XPTI enabled status
I won't mind if it was decided for some of them to be pointless, but I
think 1 (because of a measurable improvement of 1-3%), 4 (helping
the "xpti=no" case, even if only a little; taking 3 as prereq), and
6+7 should be considered seriously.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
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next reply other threads:[~2018-02-07 16:05 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-07 16:05 Jan Beulich [this message]
2018-02-07 16:12 ` [PATCH v2 1/7] x86: slightly reduce Meltdown band-aid overhead Jan Beulich
2018-02-07 19:35 ` Andrew Cooper
2018-02-08 9:20 ` Jan Beulich
2018-03-01 19:21 ` Andrew Cooper
2018-03-02 11:34 ` Jan Beulich
2018-03-02 11:38 ` Andrew Cooper
2018-02-07 16:12 ` [PATCH v2 2/7] x86: remove CR reads from exit-to-guest path Jan Beulich
2018-03-01 19:23 ` Andrew Cooper
2018-02-07 16:13 ` [PATCH v2 3/7] x86: introduce altinstruction_nop assembler macro Jan Beulich
2018-03-01 19:25 ` Andrew Cooper
2018-03-02 7:24 ` Jan Beulich
2018-02-07 16:13 ` [PATCH v2 4/7] x86: NOP out most XPTI entry/exit code when it's not in use Jan Beulich
2018-03-01 19:42 ` Andrew Cooper
2018-03-02 7:38 ` Jan Beulich
2018-02-07 16:14 ` [PATCH v2 5/7] x86: avoid double CR3 reload when switching to guest user mode Jan Beulich
2018-02-07 16:14 ` [PATCH v2 6/7] x86: disable XPTI when RDCL_NO Jan Beulich
2018-02-07 16:15 ` [PATCH v2 7/7] x86: log XPTI enabled status Jan Beulich
2018-02-13 18:39 ` [PATCH v2 0/7] x86: Meltdown band-aid overhead reduction Rich Persaud
2018-02-14 8:04 ` Jan Beulich
2018-02-28 11:52 ` Ping: " Jan Beulich
2018-02-28 12:00 ` Juergen Gross
2018-03-08 11:32 ` [PATCH v2 8/7] x86/XPTI: use %r12 to write zero into xen_cr3 Jan Beulich
2018-03-08 11:33 ` [PATCH v2 9/7] x86/XPTI: reduce .text.entry Jan Beulich
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