linux-kernel - Re: [PATCH 02/25] KVM: TDX: Define TDX architectural definitions

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Message-ID: <ZtFOdSmJobs8Kw5X@tlindgre-MOBL1>
Date: Fri, 30 Aug 2024 07:45:41 +0300
From: Tony Lindgren <tony.lindgren@...ux.intel.com>
To: Xiaoyao Li <xiaoyao.li@...el.com>
Cc: "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"pbonzini@...hat.com" <pbonzini@...hat.com>,
	"seanjc@...gle.com" <seanjc@...gle.com>,
	"Yamahata, Isaku" <isaku.yamahata@...el.com>,
	"sean.j.christopherson@...el.com" <sean.j.christopherson@...el.com>,
	"Huang, Kai" <kai.huang@...el.com>,
	"isaku.yamahata@...il.com" <isaku.yamahata@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 02/25] KVM: TDX: Define TDX architectural definitions

On Fri, Aug 30, 2024 at 09:29:19AM +0800, Xiaoyao Li wrote:
> On 8/30/2024 3:46 AM, Edgecombe, Rick P wrote:
> > On Thu, 2024-08-29 at 21:25 +0800, Xiaoyao Li wrote:
> > > On 8/13/2024 6:47 AM, Rick Edgecombe wrote:
> > > > +/*
> > > > + * TD_PARAMS is provided as an input to TDH_MNG_INIT, the size of which is
> > > > 1024B.
> > > > + */
> > > > +struct td_params {
> > > > +       u64 attributes;
> > > > +       u64 xfam;
> > > > +       u16 max_vcpus;
> > > > +       u8 reserved0[6];
> > > > +
> > > > +       u64 eptp_controls;
> > > > +       u64 exec_controls;
> > > 
> > > TDX 1.5 renames 'exec_controls' to 'config_flags', maybe we need update
> > > it to match TDX 1.5 since the minimum supported TDX module of linux
> > > starts from 1.5.
> > 
> > Agreed.

I'm doing a patch for this FYI.
 
> > > Besides, TDX 1.5 defines more fields that was reserved in TDX 1.0, but
> > > most of them are not used by current TDX enabling patches. If we update
> > > TD_PARAMS to match with TDX 1.5, should we add them as well?
> > 
> > You mean config_flags or supported "features0"? For config_flags, it seems just
> > one is missing. I don't think we need to add it.
> 
> No. I meant NUM_L2_VMS, MSR_CONFIG_CTLS, IA32_ARCH_CAPABILITIES_CONFIG,
> MRCONFIGSVN and MROWNERCONFIGSVN introduced in TD_PARAMS from TDX 1.5.
> 
> Only MSR_CONFIG_CTLS and IA32_ARCH_CAPABILITIES_CONFIG likely need enabling
> for now since they relates to MSR_IA32_ARCH_CAPABILITIES virtualization of
> TDs.

Seems these changes can be separate additional patches.

Regards,

Tony