Re: [Xen-devel] credit scheduler issues in 64bit hypervisor

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 1 Jul 2006, at 16:22, Li, Xin B wrote:

> This is caused by a vmcs bug, the root cause is on x86_64, a VMX domain
> is killed without any vmentry (caused by "Error: Device 768 (vbd) could
> not be connected. Hotplug scripts not working."), but then a VMCLEAR is
> still executed on its unlaunched VMCS.
> the following patch fixes it.
>
> Signed-off-by: Xin Li <xin.b.li@xxxxxxxxx>
This patch is itself buggy: Just because a VMCS hasn't been launched 
doesn't mean it hasn't been activated on some CPU. I think the original 
bug would be better fixed by only calling vmx_clear_vmcs() in 
vmx_destroy_vmcs() if arch_vmx->vmcs != NULL. Even better would be not 
to allocate the VMCS so darn late.
 -- Keir


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