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Date:   Wed, 29 Nov 2017 23:26:30 +0100
From:   Paolo Bonzini <>
To:     Andi Kleen <>, Wanpeng Li <>
        Radim Krčmář <>,
        Wanpeng Li <>,
        Jim Mattson <>
Subject: Re: [PATCH] KVM: VMX: Cache IA32_DEBUGCTL in memory

On 29/11/2017 19:20, Andi Kleen wrote:
> But I haven't looked too closely, but I suspect you'll clobber global
> kernel debugger state this way.

I checked all callers of update_debugctlmsr, and couldn't find any that
could run asynchronously while KVM is caching the value.  For example
__switch_to_xtra would always run before the sched_in notifier.



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