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Date:   Thu, 29 Jul 2021 14:34:16 +0800
From:   Yan Zhao <yan.y.zhao@intel.com>
To:     Yu Zhang <yu.c.zhang@linux.intel.com>
Cc:     Ben Gardon <bgardon@google.com>,
        Sean Christopherson <seanjc@google.com>,
        Paolo Bonzini <pbonzini@redhat.com>,
        "kvm@vger.kernel.org" <kvm@vger.kernel.org>
Subject: Re: A question of TDP unloading.
Message-ID: <20210729063415.GA22427@yzhao56-desk.sh.intel.com>
Reply-To: Yan Zhao <yan.y.zhao@intel.com>
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> > Sorry? Do you mean your VM needs 5 minute to boot? What is your configuration?
> >
> yes. the VM needs 5 minutes to boot when I forced enable_unrestricted_guest=0 in kvm.
> 
> > VMX unrestricted guest has been supported on all Intel platforms since years 
> > ago. I do not see any reason to disable it.
> >
> yes. just for test purpose.
> To study the impact to the mode enable_unrestricted_guest=0,
> since in this mode, cr0, cr4 causes lots of vmexit.

one correction. actually with enable_unrestricted_guest=0, it has less
number of kvm_set_cr0(), but more kvm_mmu_reset_context() called from
kvm_set_cr0().
 ___________________________________________________________________
|                            |  #cr0  |#reset_context from cr0| #cr4|
| ---------------------------|--------|-----------------------|-----|
|enable_unrestricted_guest=0 | 627405 |      313704           | 13  | 
|----------------------------|--------|-----------------------|-----|
|enable_unrestricted_guest=1 |2092493 |       5               | 13  |
--------------------------------------------------------------------