linux-kernel - Re: [PATCH 1/4] x86/hyperv: Add missing ARCH_HAS_CC

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Message-ID: <b172898d-0464-054a-9182-1110297f3629@gmail.com>
Date:   Wed, 23 Feb 2022 19:02:49 +0800
From:   Tianyu Lan <ltykernel@...il.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Wei Liu <wei.liu@...nel.org>, tglx@...utronix.de,
        mingo@...hat.com, dave.hansen@...el.com, luto@...nel.org,
        peterz@...radead.org, sathyanarayanan.kuppuswamy@...ux.intel.com,
        aarcange@...hat.com, ak@...ux.intel.com, dan.j.williams@...el.com,
        david@...hat.com, hpa@...or.com, jmattson@...gle.com,
        seanjc@...gle.com, thomas.lendacky@....com, brijesh.singh@....com,
        x86@...nel.org, linux-kernel@...r.kernel.org,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Dexuan Cui <decui@...rosoft.com>,
        Tianyu Lan <Tianyu.Lan@...rosoft.com>
Subject: Re: [PATCH 1/4] x86/hyperv: Add missing ARCH_HAS_CC_PLATFORM
 dependency

On 2/23/2022 6:56 PM, Borislav Petkov wrote:
> On Wed, Feb 23, 2022 at 06:43:40PM +0800, Tianyu Lan wrote:
>> Hyper-V code check cpuid during runtime and there is no Hyper-V
>> isolation VM option.
> 
> So how does "Current Hyper-V Isolation VM requires AMD_MEM_ENCRYPT" work
> exactly?
> 
> Please explain in detail and not in piecemeal sentences.
>
The kernel in the image needs to select AMD_MEM_ENCRYPT option
otherwise the kernel can't boot up due to missing SEV support and
sev_es_ghcb_hv_call() always return error.