From: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
To: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Cc: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: KVM: Late fixes for the 2.6.23 merge window
Date: Tue, 17 Jul 2007 16:22:49 +0300 [thread overview]
Message-ID: <11846785722851-git-send-email-avi@qumranet.com> (raw)
A trio of issues were discovered and fixed while bringing up smp guests:
- An nx huge page table shadow could alias a real mode shadow page table,
causing the real mode page to be treated as not executable. For certain
newer Linux kernels, this caused kvm to spin on the smp trampoline.
This is not an smp issue per se, but only triggered in that scenario.
- The memory slot and memory alias manipulation functions were not handled
properly in guest smp. This causes hangs starting X. With the patch
applied, Linux can boot into graphical mode.
- Windows apparently uses rdmsr and wrmsr on its trampoline, so we need to
add these instructions to the x86 emulator.
With these three patches atop the previously submitted patchset, guest smp
is fully operational. Kernel build on 2-way smp is 40% faster than on a up
guest. Expect significant performance improvements from in-kernel apic and
from further tuning.
Please review -- comments welcome.
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next reply other threads:[~2007-07-17 13:22 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-17 13:22 Avi Kivity [this message]
[not found] ` <11846785722851-git-send-email-avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-07-17 13:22 ` [PATCH 1/3] KVM: MMU: Store nx bit for large page shadows Avi Kivity
2007-07-17 13:22 ` [PATCH 2/3] KVM: Fix memory slot management functions for guest smp Avi Kivity
2007-07-17 13:22 ` [PATCH 3/3] KVM: x86 emulator: implement rdmsr and wrmsr Avi Kivity
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