linux-kernel - Re: [PATCH v3 10/13] KVM: x86: emulator/smm: use smram struct for 64 bit smram load/restore

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Date:   Wed, 24 Aug 2022 22:34:31 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Maxim Levitsky <mlevitsk@...hat.com>
Cc:     kvm@...r.kernel.org, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        linux-kernel@...r.kernel.org, Wanpeng Li <wanpengli@...cent.com>,
        Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        Jim Mattson <jmattson@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>, Joerg Roedel <joro@...tes.org>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [PATCH v3 10/13] KVM: x86: emulator/smm: use smram struct for 64
 bit smram load/restore

On Wed, Aug 03, 2022, Maxim Levitsky wrote:
> @@ -9909,57 +9906,51 @@ static void enter_smm_save_state_32(struct kvm_vcpu *vcpu, struct kvm_smram_stat
>  }
>  
>  #ifdef CONFIG_X86_64
> -static void enter_smm_save_state_64(struct kvm_vcpu *vcpu, char *buf)
> +static void enter_smm_save_state_64(struct kvm_vcpu *vcpu, struct kvm_smram_state_64 *smram)

Please put these on different lines.

>  	struct desc_ptr dt;
> -	struct kvm_segment seg;
>  	unsigned long val;
>  	int i;
>  
>  	for (i = 0; i < 16; i++)
> -		put_smstate(u64, buf, 0x7ff8 - i * 8, kvm_register_read_raw(vcpu, i));
> +		smram->gprs[15 - i] = kvm_register_read_raw(vcpu, i);

Blech, why do I get the feeling that the original layout was designed so that
ucode could use PUSHAD?  This look so weird...