From: Wei Liu <wei.liu2@citrix.com>
To: Xen-devel <xen-devel@lists.xenproject.org>
Cc: Juergen Gross <jgross@suse.com>,
Andrew Cooper <andrew.cooper3@citrix.com>,
Wei Liu <wei.liu2@citrix.com>, Jan Beulich <JBeulich@suse.com>
Subject: [PATCH RFC 0/4] Use INVPCID to flush global mappings
Date: Thu, 15 Feb 2018 12:10:36 +0000 [thread overview]
Message-ID: <20180215121040.20585-1-wei.liu2@citrix.com> (raw)
I wrote these patches sometime ago to explore PCID and INVPCID. I haven't
thought through whether how to use both in Xen yet. But seeing Juergen laid out
his thought on PCID and INVPCID I think some of the patches can be useful.
I had done some benchmark on the speed in one of my older branch by inserting
some trace points before and after the flush. It showed that twiddling CR4.PGE
is 3 to 5 times slower than invpcid.
This series is in incomplete -- obviously we have CR4.PGE twiddling in a few
other places. But if you think it is beneficial I can try to convert those
places as well.
Wei.
Wei Liu (4):
x86: introduce cpu_has_invpcid
x86: report if PCID and INVPCID are supported
x86: add invpcid.h
x86: use invpcid to do global flush
xen/arch/x86/flushtlb.c | 22 ++++++++++++---
xen/arch/x86/setup.c | 7 +++++
xen/include/asm-x86/cpufeature.h | 1 +
xen/include/asm-x86/invpcid.h | 61 ++++++++++++++++++++++++++++++++++++++++
4 files changed, 87 insertions(+), 4 deletions(-)
create mode 100644 xen/include/asm-x86/invpcid.h
--
2.11.0
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next reply other threads:[~2018-02-15 12:10 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-15 12:10 Wei Liu [this message]
2018-02-15 12:10 ` [PATCH RFC 1/4] x86: introduce cpu_has_invpcid Wei Liu
2018-02-15 12:31 ` Jan Beulich
2018-02-15 12:10 ` [PATCH RFC 2/4] x86: report if PCID and INVPCID are supported Wei Liu
2018-02-15 12:10 ` [PATCH RFC 3/4] x86: add invpcid.h Wei Liu
2018-02-15 12:15 ` Andrew Cooper
2018-02-15 12:24 ` Wei Liu
2018-02-15 12:26 ` Andrew Cooper
2018-02-15 12:34 ` Jan Beulich
2018-02-15 12:35 ` Wei Liu
2018-02-15 13:23 ` Jan Beulich
2018-02-15 12:10 ` [PATCH RFC 4/4] x86: use invpcid to do global flush Wei Liu
2018-02-15 15:38 ` [PATCH RFC 0/4] Use INVPCID to flush global mappings Juergen Gross
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