linux-kernel - Re: [PATCH 3/4] KVM: VMX: Fix stale docs for kvm-intel.emulate_invalid_guest

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Date:   Tue, 14 Dec 2021 11:12:45 +0200
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        syzbot+f1d2136db9c80d4733e8@...kaller.appspotmail.com
Subject: Re: [PATCH 3/4] KVM: VMX: Fix stale docs for
 kvm-intel.emulate_invalid_guest_state

On Tue, 2021-12-07 at 19:30 +0000, Sean Christopherson wrote:
> Update the documentation for kvm-intel's emulate_invalid_guest_state to
> rectify the description of KVM's default behavior, and to document that
> the behavior and thus parameter only applies to L1.
> 
> Fixes: a27685c33acc ("KVM: VMX: Emulate invalid guest state by default")
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>
> ---
>  Documentation/admin-guide/kernel-parameters.txt | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 9725c546a0d4..fc34332c8d9a 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -2413,8 +2413,12 @@
>  			Default is 1 (enabled)
>  
>  	kvm-intel.emulate_invalid_guest_state=
> -			[KVM,Intel] Enable emulation of invalid guest states
> -			Default is 0 (disabled)
> +			[KVM,Intel] Disable emulation of invalid guest state.
> +			Ignored if kvm-intel.enable_unrestricted_guest=1, as
> +			guest state is never invalid for unrestricted guests.
> +			This param doesn't apply to nested guests (L2), as KVM
> +			never emulates invalid L2 guest state.
> +			Default is 1 (enabled)
>  
>  	kvm-intel.flexpriority=
>  			[KVM,Intel] Disable FlexPriority feature (TPR shadow).
Reviewed-by: Maxim Levitsky <mlevitsk@...hat.com>
Best regards,
	Maxim Levitsky