From: Avi Kivity <avi@redhat.com>
To: Marcelo Tosatti <mtosatti@redhat.com>, kvm@vger.kernel.org
Subject: [PATCH 0/2] Optimize ds/es reload
Date: Sun, 13 May 2012 19:53:22 +0300 [thread overview]
Message-ID: <1336928004-6366-1-git-send-email-avi@redhat.com> (raw)
The lightweight exit path needlessly reloads %ds and %es (and clobbers the
user supplied values as well, a minor ABI bug). This patchset fixes the bug
and moves the reload to the heavyweight exit path (potentially skipping it
completely on x86_64), reducing the vmexit cost by about 70 cycles.
Avi Kivity (2):
KVM: VMX: Fix %ds/%es clobber
KVM: VMX: Optimize %ds, %es reload
arch/x86/kvm/vmx.c | 32 +++++++++++++++++++++++++++++++-
1 file changed, 31 insertions(+), 1 deletion(-)
--
1.7.10.1
next reply other threads:[~2012-05-13 16:53 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-13 16:53 Avi Kivity [this message]
2012-05-13 16:53 ` [PATCH 1/2] KVM: VMX: Fix %ds/%es clobber Avi Kivity
2012-05-13 16:53 ` [PATCH 2/2] KVM: VMX: Optimize %ds, %es reload Avi Kivity
2012-05-16 19:04 ` [PATCH 0/2] Optimize ds/es reload Marcelo Tosatti
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