linux-kernel - Re: [RFC v2 02/17] x86/apic: Initialize Secure AVIC APIC backing page

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Message-ID: <e5f0ffa362ef8731a61c03882738956bb9f4c13b.camel@gmail.com>
Date: Fri, 21 Mar 2025 17:32:51 +0100
From: Francesco Lavra <francescolavra.fl@...il.com>
To: neeraj.upadhyay@....com
Cc: David.Kaplan@....com, Santosh.Shukla@....com,
 Suravee.Suthikulpanit@....com,  Thomas.Lendacky@....com,
 Vasant.Hegde@....com, bp@...en8.de,  dave.hansen@...ux.intel.com,
 hpa@...or.com, huibo.wang@....com,  kirill.shutemov@...ux.intel.com,
 kvm@...r.kernel.org,  linux-kernel@...r.kernel.org, mingo@...hat.com,
 naveen.rao@....com, nikunj@....com,  pbonzini@...hat.com,
 peterz@...radead.org, seanjc@...gle.com, tglx@...utronix.de,  x86@...nel.org
Subject: Re: [RFC v2 02/17] x86/apic: Initialize Secure AVIC APIC backing
 page

On 2025-02-26 at 9:05, Neeraj Upadhyay wrote:
> diff --git a/arch/x86/coco/sev/core.c b/arch/x86/coco/sev/core.c
> index 82492efc5d94..300bc8f6eb6f 100644
> --- a/arch/x86/coco/sev/core.c
> +++ b/arch/x86/coco/sev/core.c
> @@ -1504,6 +1504,38 @@ static enum es_result vc_handle_msr(struct
> ghcb *ghcb, struct es_em_ctxt *ctxt)
>  	return ret;
>  }
>  
> +/*
> + * Register GPA of the Secure AVIC backing page.
> + *
> + * @apic_id: APIC ID of the vCPU. Use -1ULL for the current vCPU
> + *           doing the call.
> + * @gpa    : GPA of the Secure AVIC backing page.
> + */
> +enum es_result savic_register_gpa(u64 apic_id, u64 gpa)
> +{
> +	struct ghcb_state state;
> +	struct es_em_ctxt ctxt;
> +	unsigned long flags;
> +	struct ghcb *ghcb;
> +	int ret = 0;

This should be an enum es_result, and there is no need to zero-
initialize it.
The same applies to savic_unregister_gpa() in patch 14.