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

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Message-ID: <bcdbd534-a077-3bb3-3d37-c9eb2a048854@gmail.com>
Date:   Wed, 23 Feb 2022 18:43:40 +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 6:41 PM, Borislav Petkov wrote:
> On Wed, Feb 23, 2022 at 03:04:41PM +0800, Tianyu Lan wrote:
>>        Current Hyper-V Isolation VM requires AMD_MEM_ENCRYPT option which
> 
> Where is that isolation VM option? Out of tree?
> 
> Because
> 
> $ git grep AMD_MEM_ENCRYPT | grep Kconfig
> arch/x86/Kconfig:1540:config AMD_MEM_ENCRYPT
> arch/x86/Kconfig:1553:config AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT
> arch/x86/Kconfig:1555:  depends on AMD_MEM_ENCRYPT
> 
> and those ain't it.

Hyper-V code check cpuid during runtime and there is no Hyper-V
isolation VM option.