linux-kernel - Re: [PATCH v3 1/7] KVM: x86: nSVM: correctly virtualize LBR msrs when L2 is running

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Message-ID: <e38f0d14-419d-7b3d-4ce4-bd37200ba232@redhat.com>
Date:   Wed, 9 Mar 2022 14:00:04 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Maxim Levitsky <mlevitsk@...hat.com>, kvm@...r.kernel.org
Cc:     Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jim Mattson <jmattson@...gle.com>, x86@...nel.org,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Joerg Roedel <joro@...tes.org>, linux-kernel@...r.kernel.org,
        Wanpeng Li <wanpengli@...cent.com>
Subject: Re: [PATCH v3 1/7] KVM: x86: nSVM: correctly virtualize LBR msrs when
 L2 is running

On 3/1/22 15:36, Maxim Levitsky wrote:
> +void svm_copy_lbrs(struct vmcb *from_vmcb, struct vmcb *to_vmcb)
> +{
> +	to_vmcb->save.dbgctl		= from_vmcb->save.dbgctl;
> +	to_vmcb->save.br_from		= from_vmcb->save.br_from;
> +	to_vmcb->save.br_to		= from_vmcb->save.br_to;
> +	to_vmcb->save.last_excp_from	= from_vmcb->save.last_excp_from;
> +	to_vmcb->save.last_excp_to	= from_vmcb->save.last_excp_to;
> +
> +	vmcb_mark_dirty(to_vmcb, VMCB_LBR);
> +}
> +

I think "struct vmcb *to_vmcb, struct vmcb *from_vmcb" is more common 
(e.g. svm_copy_vmrun_state, svm_copy_vmloadsave_state).

Paolo