linux-kernel - Re: [PATCH RESEND v4 16/23] KVM: x86: smm: add structs for KVM's smram layout

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Message-ID: <c0e342ac-32a3-4f92-65c1-e4c990af7698@redhat.com>
Date:   Fri, 28 Oct 2022 15:34:32 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Maxim Levitsky <mlevitsk@...hat.com>, kvm@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Yang Zhong <yang.zhong@...el.com>, x86@...nel.org,
        Jim Mattson <jmattson@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Shuah Khan <shuah@...nel.org>,
        Guang Zeng <guang.zeng@...el.com>,
        Joerg Roedel <joro@...tes.org>, linux-kernel@...r.kernel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>,
        linux-kselftest@...r.kernel.org, Kees Cook <keescook@...omium.org>,
        "H. Peter Anvin" <hpa@...or.com>, Wei Wang <wei.w.wang@...el.com>,
        Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH RESEND v4 16/23] KVM: x86: smm: add structs for KVM's
 smram layout

On 10/25/22 14:47, Maxim Levitsky wrote:
> +	u32 cr4; /* CR4 is not present in Intel/AMD SMRAM image */
> +	u32 reserved3[5];
> +
> +	/*
> +	 * Segment state is not present/documented in the Intel/AMD SMRAM image
> +	 * Instead this area on Intel/AMD contains IO/HLT restart flags.
> +	 */

Both of these are based on the Intel P6 layout at 
https://www.sandpile.org/x86/smm.htm.

Paolo