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20 Oct 2023 13:13:36 -0700 Message-ID: <5263c580-ccfb-4382-936a-e767eeae5af2@intel.com> Date: Fri, 20 Oct 2023 13:13:30 -0700 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] x86/mm: Print the encryption features correctly when a paravisor is present Content-Language: en-US To: Dexuan Cui , KY Srinivasan , Haiyang Zhang , "wei.liu@kernel.org" , "tglx@linutronix.de" , "mingo@redhat.com" , "bp@alien8.de" , "dave.hansen@linux.intel.com" , "x86@kernel.org" , "hpa@zytor.com" , "luto@kernel.org" , "peterz@infradead.org" , "stefan.bader@canonical.com" , Tim Gardner , "roxana.nicolescu@canonical.com" , "cascardo@canonical.com" , "Michael Kelley (LINUX)" , "jgross@suse.com" , "sathyanarayanan.kuppuswamy@linux.intel.com" , "kirill.shutemov@linux.intel.com" , "sashal@kernel.org" , "matija.glavinic-pecotic.ext@nokia.com" , "linux-hyperv@vger.kernel.org" Cc: "linux-kernel@vger.kernel.org" References: <20231019062030.3206-1-decui@microsoft.com> <00ff2f75-e780-4e2d-bcc9-f441f5ef879c@intel.com> <5245c0df-130c-443d-896b-01887875382b@intel.com> From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 10/20/23 13:00, Dexuan Cui wrote: >> OK, then what good is this patch in the first place? If you are right, >> then this would give equivalent information: >> >> cat /proc/cpuinfo | grep -q Intel && echo 'TDX' >> cat /proc/cpuinfo | grep -q AMD && echo 'SEV' >> >> No kernel patching needed, right? > Currently arch/x86/mm/mem_encrypt.c: print_mem_encrypt_feature_info() > prints an incorrect and confusing message > "Memory Encryption Features active: AMD SEV". > when an Intel TDX VM with a paravisor runs on Hyper-V. > > So I think a kernel patch is needed. How about either removing the message entirely or removing the ": AMD SEV" part?