linux-kernel - RE: [PATCH] x86/mm: Print the encryption features correctly when a paravisor is present

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Message-ID: <SA1PR21MB1335436A8F629E91C933C776BFDBA@SA1PR21MB1335.namprd21.prod.outlook.com>
Date:   Fri, 20 Oct 2023 20:20:32 +0000
From:   Dexuan Cui <decui@...rosoft.com>
To:     Dave Hansen <dave.hansen@...el.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "x86@...nel.org" <x86@...nel.org>, "hpa@...or.com" <hpa@...or.com>,
        "luto@...nel.org" <luto@...nel.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "stefan.bader@...onical.com" <stefan.bader@...onical.com>,
        Tim Gardner <tim.gardner@...onical.com>,
        "roxana.nicolescu@...onical.com" <roxana.nicolescu@...onical.com>,
        "cascardo@...onical.com" <cascardo@...onical.com>,
        "Michael Kelley (LINUX)" <mikelley@...rosoft.com>,
        "jgross@...e.com" <jgross@...e.com>,
        "sathyanarayanan.kuppuswamy@...ux.intel.com" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
        "sashal@...nel.org" <sashal@...nel.org>,
        "matija.glavinic-pecotic.ext@...ia.com" 
        <matija.glavinic-pecotic.ext@...ia.com>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] x86/mm: Print the encryption features correctly when a
 paravisor is present

> From: Dave Hansen <dave.hansen@...el.com>
> Sent: Friday, October 20, 2023 1:14 PM
> To: Dexuan Cui <decui@...rosoft.com>; KY Srinivasan
> [...]
> 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?

It looks good to me if we can update/remove the message in
print_mem_encrypt_feature_info(), but I guess AMD folks might want to
keep the ": AMD SEV" part?