On 05/24/2011 03:42 PM, Avi Kivity wrote:
On 05/24/2011 04:37 PM, Markus Schade wrote:
On Tue, 24 May 2011, Avi Kivity wrote:
Hmm, only 19 patches between .37 and .38 touch vmx.c. Avi, any idea
which
of those patches could cause this?
Might be several.
Markus, can you try a bisect?
The command
$ git bisect start v2.6.38 v2.6.37 arch/x86/kvm
will generate test kernels for you to compile and run. There will be
7-8 tests needed, and most of the compiles should be short (esp. if
you install ccache).
Sure. I will take some time, though. Shall I use Linus git tree or the
kvm one?
Either will work - the kvm tree includes the Linus tree. Since you
tested .37 and .38, best to give those to git as starting points.
Git bisect tells me that this is the first bad commit:
-----------------%<-----------------
aff48baa34c033318ad322ecbf2e4bcd891b29ca is the first bad commit
commit aff48baa34c033318ad322ecbf2e4bcd891b29ca
Author: Avi Kivity <avi@xxxxxxxxxx>
Date: Sun Dec 5 18:56:11 2010 +0200
KVM: Fetch guest cr3 from hardware on demand
Instead of syncing the guest cr3 every exit, which is expensince on vmx
with ept enabled, sync it only on demand.
[sheng: fix incorrect cr3 seen by Windows XP]
Signed-off-by: Sheng Yang <sheng@xxxxxxxxxxxxxxx>
Signed-off-by: Avi Kivity <avi@xxxxxxxxxx>
:040000 040000 fb059dc23facd323cafc88a39cff862f044d693d
77247dfbfe49f0a732cbaa2593d794c3b6c8f0fc M arch
-----------------%<-----------------
The full log is:
# bad: [521cb40b0c44418a4fd36dc633f575813d59a43d] Linux 2.6.38
# good: [3c0eee3fe6a3a1c745379547c7e7c904aa64f6d5] Linux 2.6.37
git bisect start 'v2.6.38' 'v2.6.37' 'arch/x86/kvm'
# good: [ec9e60b21977007e3dfacc2b8fe3a8fbb9276b51] KVM: X86: Introduce
generic guest-mode representation
git bisect good ec9e60b21977007e3dfacc2b8fe3a8fbb9276b51
# good: [d4dbf470096c51cb4785167ea59fdbdea87ccbe4] KVM: MMU: Make the
way of accessing lpage_info more generic
git bisect good d4dbf470096c51cb4785167ea59fdbdea87ccbe4
# good: [c445f8ef43bd9d2fb28213920d9b21f2465d22df] KVM: MMU: Initialize
base_role for tdp mmus
git bisect good c445f8ef43bd9d2fb28213920d9b21f2465d22df
# bad: [444e863d13373b958ec6b133dcecf140d6c6c2ab] KVM: VMX: when
entering real mode align segment base to 16 bytes
git bisect bad 444e863d13373b958ec6b133dcecf140d6c6c2ab
# good: [9f8fe5043fd26627c2fa2e9a41896885e675000b] KVM: Replace reads of
vcpu->arch.cr3 by an accessor
git bisect good 9f8fe5043fd26627c2fa2e9a41896885e675000b
# bad: [b034cf0105235e65ee1b0161dbe8fef0338d06e7] KVM: MMU: audit: allow
audit more guests at the same time
git bisect bad b034cf0105235e65ee1b0161dbe8fef0338d06e7
# bad: [aff48baa34c033318ad322ecbf2e4bcd891b29ca] KVM: Fetch guest cr3
from hardware on demand
git bisect bad aff48baa34c033318ad322ecbf2e4bcd891b29ca
Best regards,
Markus
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