linux-kernel - Re: [PATCH v3 09/21] x86/virt/tdx: Get information about TDX module and convertible memory

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Date:   Thu, 19 May 2022 11:56:53 +1200
From:   Kai Huang <kai.huang@...el.com>
To:     Sagi Shahar <sagis@...gle.com>
Cc:     Dave Hansen <dave.hansen@...el.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>, len.brown@...el.com,
        tony.luck@...el.com, rafael.j.wysocki@...el.com,
        reinette.chatre@...el.com, dan.j.williams@...el.com,
        peterz@...radead.org, ak@...ux.intel.com,
        kirill.shutemov@...ux.intel.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com,
        "Yamahata, Isaku" <isaku.yamahata@...el.com>
Subject: Re: [PATCH v3 09/21] x86/virt/tdx: Get information about TDX module
 and convertible memory

On Wed, 2022-05-18 at 15:30 -0700, Sagi Shahar wrote:
> > > 
> > > > +   pr_info("TDX module: vendor_id 0x%x, major_version %u, minor_version
> > > > %u, build_date %u, build_num %u",
> > > > +           tdx_sysinfo.vendor_id, tdx_sysinfo.major_version,
> > > > +           tdx_sysinfo.minor_version, tdx_sysinfo.build_date,
> > > > +           tdx_sysinfo.build_num);
> > > > +
> > > > +   /* Print BIOS provided CMRs */
> > > > +   print_cmrs(tdx_cmr_array, cmr_num, "BIOS-CMR");
> > > > +
> 
> sanitize_cmrs already prints the cmrs in case of success. So for valid
> cmrs we are going to print them twice.
> Would it be better to only print cmrs here in case sanitize_cmrs fails?

The "BIOS-CMR" will always have 32 entries.  It includes all the *empty* CMRs
after the valid CMRs, so the two are different.  But yes it seems there's no
need to always print "BIOS-CMR".


-- 
Thanks,
-Kai