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Message-ID: <20266111-2f25-49c1-8cda-69eac40ad9f0@intel.com>
Date:   Mon, 27 Nov 2023 13:06:12 -0800
MIME-Version: 1.0
User-Agent: Mozilla Thunderbird
Subject: Re: [PATCH v15 17/23] x86/kexec: Flush cache of TDX private memory
Content-Language: en-US
To:     "Huang, Kai" <kai.huang@intel.com>,
        "kvm@vger.kernel.org" <kvm@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Cc:     "Williams, Dan J" <dan.j.williams@intel.com>,
        "x86@kernel.org" <x86@kernel.org>,
        "Luck, Tony" <tony.luck@intel.com>,
        "david@redhat.com" <david@redhat.com>,
        "bagasdotme@gmail.com" <bagasdotme@gmail.com>,
        "ak@linux.intel.com" <ak@linux.intel.com>,
        "kirill.shutemov@linux.intel.com" <kirill.shutemov@linux.intel.com>,
        "mingo@redhat.com" <mingo@redhat.com>,
        "seanjc@google.com" <seanjc@google.com>,
        "pbonzini@redhat.com" <pbonzini@redhat.com>,
        "tglx@linutronix.de" <tglx@linutronix.de>,
        "Yamahata, Isaku" <isaku.yamahata@intel.com>,
        "nik.borisov@suse.com" <nik.borisov@suse.com>,
        "hpa@zytor.com" <hpa@zytor.com>,
        "sagis@google.com" <sagis@google.com>,
        "imammedo@redhat.com" <imammedo@redhat.com>,
        "peterz@infradead.org" <peterz@infradead.org>,
        "bp@alien8.de" <bp@alien8.de>, "Brown, Len" <len.brown@intel.com>,
        "sathyanarayanan.kuppuswamy@linux.intel.com" 
        <sathyanarayanan.kuppuswamy@linux.intel.com>,
        "Huang, Ying" <ying.huang@intel.com>,
        "rafael@kernel.org" <rafael@kernel.org>,
        "Gao, Chao" <chao.gao@intel.com>
References: <cover.1699527082.git.kai.huang@intel.com>
 <2151c68079c1cb837d07bd8015e4ff1f662e1a6e.1699527082.git.kai.huang@intel.com>
 <cfea7192-4b29-46f9-a500-149121f493c8@intel.com>
 <e8fd4bff8244e9e709c997da309e73a932567959.camel@intel.com>
 <4ca2f6c1-97a7-4992-b01f-60341f6749ff@intel.com>
 <f74375b44d86f11843901a909e60bed228809677.camel@intel.com>
From:   Dave Hansen <dave.hansen@intel.com>
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In-Reply-To: <f74375b44d86f11843901a909e60bed228809677.camel@intel.com>
Precedence: bulk

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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.
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