Re: [PATCH] KVM: VMX: Cache IA32_DEBUGCTL in memory

[Paolo Bonzini]

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.

Thanks,

Paolo