linux-kernel - Re: [PATCH v2 2/4] KVM: SVM: Add support to handle AP reset MSR protocol

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Message-ID: <YS/0fnLXTPDnRfVQ@google.com>
Date:   Wed, 1 Sep 2021 21:45:34 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Joerg Roedel <joro@...tes.org>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Brijesh Singh <brijesh.singh@....com>,
        Tom Lendacky <thomas.lendacky@....com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-coco@...ts.linux.dev,
        Joerg Roedel <jroedel@...e.de>
Subject: Re: [PATCH v2 2/4] KVM: SVM: Add support to handle AP reset MSR
 protocol

On Thu, Jul 22, 2021, Joerg Roedel wrote:
> diff --git a/arch/x86/include/asm/sev-common.h b/arch/x86/include/asm/sev-common.h
> index 8540972cad04..04470aab421b 100644
> --- a/arch/x86/include/asm/sev-common.h
> +++ b/arch/x86/include/asm/sev-common.h
> @@ -11,6 +11,7 @@
>  #define GHCB_MSR_INFO_POS		0
>  #define GHCB_DATA_LOW			12
>  #define GHCB_MSR_INFO_MASK		(BIT_ULL(GHCB_DATA_LOW) - 1)
> +#define GHCB_DATA_MASK			GENMASK_ULL(51, 0)

Note used in this patch, not sure if it's intended to be used in GHCB_DATA below?

>  #define GHCB_DATA(v)			\
>  	(((unsigned long)(v) & ~GHCB_MSR_INFO_MASK) >> GHCB_DATA_LOW)
> diff --git a/arch/x86/include/asm/svm.h b/arch/x86/include/asm/svm.h
> index e322676039f4..5a28f223a9a8 100644
> --- a/arch/x86/include/asm/svm.h
> +++ b/arch/x86/include/asm/svm.h
> @@ -164,7 +164,6 @@ struct __attribute__ ((__packed__)) vmcb_control_area {
>  	u8 reserved_sw[32];
>  };
>  
> -

Unrelated whitespace change.

>  #define TLB_CONTROL_DO_NOTHING 0
>  #define TLB_CONTROL_FLUSH_ALL_ASID 1
>  #define TLB_CONTROL_FLUSH_ASID 3