linux-kernel - Re: [PATCH] KVM: SVM: Use 'unsigned long' for the physical address passed to VMSAVE

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Date:   Wed, 3 Feb 2021 09:03:50 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Robert Hu <robert.hu@...el.com>,
        Farrah Chen <farrah.chen@...el.com>,
        Danmei Wei <danmei.wei@...el.com>,
        Tom Lendacky <Thomas.Lendacky@....com>
Subject: Re: [PATCH] KVM: SVM: Use 'unsigned long' for the physical address
 passed to VMSAVE

On 02/02/21 23:34, Sean Christopherson wrote:
> diff --git a/arch/x86/kvm/svm/svm_ops.h b/arch/x86/kvm/svm/svm_ops.h
> index 0c8377aee52c..9f007bc8409a 100644
> --- a/arch/x86/kvm/svm/svm_ops.h
> +++ b/arch/x86/kvm/svm/svm_ops.h
> @@ -51,7 +51,12 @@ static inline void invlpga(unsigned long addr, u32 asid)
>  	svm_asm2(invlpga, "c"(asid), "a"(addr));
>  }
>  
> -static inline void vmsave(hpa_t pa)
> +/*
> + * Despite being a physical address, the portion of rAX that is consumed by
> + * VMSAVE, VMLOAD, etc... is still controlled by the effective address size,
> + * hence 'unsigned long' instead of 'hpa_t'.
> + */
> +static inline void vmsave(unsigned long pa)
>  {
>  	svm_asm1(vmsave, "a" (pa), "memory");
>  }
> -- 
> 2.30.0.365.g02bc693789-goog
> 

Squashed, thanks.

Paolo