linux-kernel - Re: [PATCH 8/8] KVM: nSVM: read only changed fields of the nested guest data area

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Date:   Thu, 20 Aug 2020 12:57:41 +0300
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org
Cc:     Jim Mattson <jmattson@...gle.com>, Joerg Roedel <joro@...tes.org>,
        Borislav Petkov <bp@...en8.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        "open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)" 
        <linux-kernel@...r.kernel.org>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>
Subject: Re: [PATCH 8/8] KVM: nSVM: read only changed fields of the nested
 guest data area

On Thu, 2020-08-20 at 11:55 +0200, Paolo Bonzini wrote:
> On 20/08/20 11:13, Maxim Levitsky wrote:
> > diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
> > index 06668e0f93e7..f0bb7f622dca 100644
> > --- a/arch/x86/kvm/svm/svm.c
> > +++ b/arch/x86/kvm/svm/svm.c
> > @@ -3924,7 +3924,7 @@ static int svm_pre_leave_smm(struct kvm_vcpu *vcpu, const char *smstate)
> >  		if (kvm_vcpu_map(&svm->vcpu, gpa_to_gfn(vmcb_gpa), &map) == -EINVAL)
> >  			return 1;
> >  
> > -		load_nested_vmcb(svm, map.hva, vmcb);
> > +		load_nested_vmcb(svm, map.hva, vmcb_gpa);
> >  		ret = enter_svm_guest_mode(svm);
> >  
> 
> Wrong patch?

Absolutely. I reordered the refactoring patches to be at the beginning,
and didn't test this enough.

Best regards,
	Maxim Levitsky

> 
> Paolo
>