linux-kernel - Re: [PATCH v15 17/23] x86/kexec: Flush cache of TDX private memory

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Date:   Mon, 27 Nov 2023 13:06:12 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     "Huang, Kai" <kai.huang@...el.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:     "Williams, Dan J" <dan.j.williams@...el.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "Luck, Tony" <tony.luck@...el.com>,
        "david@...hat.com" <david@...hat.com>,
        "bagasdotme@...il.com" <bagasdotme@...il.com>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "seanjc@...gle.com" <seanjc@...gle.com>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "Yamahata, Isaku" <isaku.yamahata@...el.com>,
        "nik.borisov@...e.com" <nik.borisov@...e.com>,
        "hpa@...or.com" <hpa@...or.com>,
        "sagis@...gle.com" <sagis@...gle.com>,
        "imammedo@...hat.com" <imammedo@...hat.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "bp@...en8.de" <bp@...en8.de>, "Brown, Len" <len.brown@...el.com>,
        "sathyanarayanan.kuppuswamy@...ux.intel.com" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        "Huang, Ying" <ying.huang@...el.com>,
        "rafael@...nel.org" <rafael@...nel.org>,
        "Gao, Chao" <chao.gao@...el.com>
Subject: Re: [PATCH v15 17/23] x86/kexec: Flush cache of TDX private memory

On 11/27/23 12:52, Huang, Kai wrote:
> --- a/arch/x86/kernel/machine_kexec_64.c
> +++ b/arch/x86/kernel/machine_kexec_64.c
> @@ -377,7 +377,8 @@ void machine_kexec(struct kimage *image)
>                                        (unsigned long)page_list,
>                                        image->start,
>                                        image->preserve_context,
> -
> cc_platform_has(CC_ATTR_HOST_MEM_ENCRYPT));
> +                                      cc_platform_has(CC_ATTR_HOST_MEM_ENCRYPT)
> ||
> +                                      platform_tdx_enabled());

Well, something more like the attached would be preferable, but you've
got the right idea logically.
View attachment "cc-host-mem-incoherent.patch" of type "text/x-patch" (2319 bytes)