Re: KVM Test result, kernel a16664b.., userspace3017d05.. one new issue

[Dor Laor <dor.laor@gmail.com>]

On Wed, 2008-03-12 at 10:41 +0800, Yunfeng Zhao wrote:
> Chris Wedgwood wrote:
> > On Mon, Mar 10, 2008 at 05:27:32PM +0800, Yunfeng Zhao wrote:
> >
> >   
> >> One new issue:
> >> 1.  booting smp windows guests has 30% chance of hang
> >> https://sourceforge.net/tracker/?func=detail&atid=893831&aid=1910923&group_id=180599
> >>     
> >
> >   
> >> Platform                Woodcrest
> >> CPU                     4
> >> Memory size         8G'
> >>     
> >
> > Is that a CPU with FlexPriority?
> >
> >   
> Yes, it has FlexPriority.

We have some minor issues with FlexPriority (mainly crashes after 100+
reboots).
Can you try the following patch that disables flex priority:

Author: Uri Lublin <uril@qumranet.com>
Date:   Thu Mar 6 17:38:11 2008 +0200

    kvm: vmx: for 4.0 disable Flex-Priority and always use Avi's tpr
optimization
    
    Signed-off-by: Uri Lublin <uril@qumranet.com>

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 76c4508..bc8dc16 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -201,6 +201,7 @@ static inline int cpu_has_secondary_exec_ctrls(void)
 
 static inline bool cpu_has_vmx_virtualize_apic_accesses(void)
 {
+       return false; /* disable Flex-Priority, use Avi's tpr
optimization */
        return (vmcs_config.cpu_based_2nd_exec_ctrl &
                SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES);
 }


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