linux-kernel - Re: [PATCH 4/6] x86/hyperv: Add hv_isolation_type

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Message-ID: <Y3vyNDpcR5+nScdw@zn.tnic>
Date:   Mon, 21 Nov 2022 22:48:36 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Dave Hansen <dave.hansen@...el.com>
Cc:     Dexuan Cui <decui@...rosoft.com>, ak@...ux.intel.com,
        arnd@...db.de, brijesh.singh@....com, dan.j.williams@...el.com,
        dave.hansen@...ux.intel.com, haiyangz@...rosoft.com, hpa@...or.com,
        jane.chu@...cle.com, kirill.shutemov@...ux.intel.com,
        kys@...rosoft.com, linux-arch@...r.kernel.org,
        linux-hyperv@...r.kernel.org, luto@...nel.org, mingo@...hat.com,
        peterz@...radead.org, rostedt@...dmis.org,
        sathyanarayanan.kuppuswamy@...ux.intel.com, seanjc@...gle.com,
        tglx@...utronix.de, tony.luck@...el.com, wei.liu@...nel.org,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/6] x86/hyperv: Add hv_isolation_type_tdx() to detect
 TDX guests

On Mon, Nov 21, 2022 at 01:01:45PM -0800, Dave Hansen wrote:
> On 11/21/22 11:51, Dexuan Cui wrote:
> > +			switch (hv_get_isolation_type()) {
> > +			case HV_ISOLATION_TYPE_VBS:
> > +			case HV_ISOLATION_TYPE_SNP:
> >  				cc_set_vendor(CC_VENDOR_HYPERV);
> > +				break;
> > +
> > +			case HV_ISOLATION_TYPE_TDX:
> > +				static_branch_enable(&isolation_type_tdx);
> > +				break;
> 
> This makes zero logical sense to me.
> 
> Running on Hyper-V, a HV_ISOLATION_TYPE_SNP is CC_VENDOR_HYPERV, but a
> HV_ISOLATION_TYPE_TDX guest is *NOT* CC_VENDOR_HYPERV?

https://lore.kernel.org/r/Y3uTK3rBV6eXSJnC@zn.tnic

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette