linux-kernel - Re: [PATCH 2/9] KVM: x86: SVM: Update dump_vmcb with shadow stack save area additions

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Date:   Thu, 02 Nov 2023 20:00:54 +0200
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     John Allen <john.allen@....com>, kvm@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, pbonzini@...hat.com,
        weijiang.yang@...el.com, rick.p.edgecombe@...el.com,
        seanjc@...gle.com, x86@...nel.org, thomas.lendacky@....com,
        bp@...en8.de
Subject: Re: [PATCH 2/9] KVM: x86: SVM: Update dump_vmcb with shadow stack
 save area additions

On Tue, 2023-10-10 at 20:02 +0000, John Allen wrote:
> Add shadow stack VMCB save area fields to dump_vmcb. Only include S_CET,
> SSP, and ISST_ADDR. Since there currently isn't support to decrypt and
> dump the SEV-ES save area, exclude PL0_SSP, PL1_SSP, PL2_SSP, PL3_SSP, and
> U_CET which are only inlcuded in the SEV-ES save area.
> 
> Signed-off-by: John Allen <john.allen@....com>
> ---
>  arch/x86/kvm/svm/svm.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
> index 6a0d225311bc..e435e4fbadda 100644
> --- a/arch/x86/kvm/svm/svm.c
> +++ b/arch/x86/kvm/svm/svm.c
> @@ -3416,6 +3416,10 @@ static void dump_vmcb(struct kvm_vcpu *vcpu)
>  	       "rip:", save->rip, "rflags:", save->rflags);
>  	pr_err("%-15s %016llx %-13s %016llx\n",
>  	       "rsp:", save->rsp, "rax:", save->rax);
> +	pr_err("%-15s %016llx %-13s %016llx\n",
> +	       "s_cet:", save->s_cet, "ssp:", save->ssp);
> +	pr_err("%-15s %016llx\n",
> +	       "isst_addr:", save->isst_addr);
>  	pr_err("%-15s %016llx %-13s %016llx\n",
>  	       "star:", save01->star, "lstar:", save01->lstar);
>  	pr_err("%-15s %016llx %-13s %016llx\n",

Reviewed-by: Maxim Levitsky <mlevitsk@...hat.com>

Best regards,
	Maxim Levitsky