linux-kernel - Re: [PATCH Part1 RFC v4 05/36] x86/sev: Define the Linux specific guest termination reasons

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Date:   Tue, 10 Aug 2021 09:59:39 -0500
From:   Brijesh Singh <brijesh.singh@....com>
To:     Borislav Petkov <bp@...en8.de>,
        Tom Lendacky <thomas.lendacky@....com>
Cc:     brijesh.singh@....com, x86@...nel.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        linux-efi@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        linux-coco@...ts.linux.dev, linux-mm@...ck.org,
        linux-crypto@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Joerg Roedel <jroedel@...e.de>,
        "H. Peter Anvin" <hpa@...or.com>, Ard Biesheuvel <ardb@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Sergio Lopez <slp@...hat.com>, Peter Gonda <pgonda@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        David Rientjes <rientjes@...gle.com>,
        Dov Murik <dovmurik@...ux.ibm.com>,
        Tobin Feldman-Fitzthum <tobin@....com>,
        Michael Roth <michael.roth@....com>,
        Vlastimil Babka <vbabka@...e.cz>, tony.luck@...el.com,
        brijesh.ksingh@...il.com
Subject: Re: [PATCH Part1 RFC v4 05/36] x86/sev: Define the Linux specific
 guest termination reasons



On 8/10/21 6:33 AM, Borislav Petkov wrote:
> On Wed, Jul 07, 2021 at 01:14:35PM -0500, Brijesh Singh wrote:
>> diff --git a/arch/x86/include/asm/sev-common.h b/arch/x86/include/asm/sev-common.h
>> index 23929a3010df..e75e29c05f59 100644
>> --- a/arch/x86/include/asm/sev-common.h
>> +++ b/arch/x86/include/asm/sev-common.h
>> @@ -63,9 +63,17 @@
>>   	(((((u64)reason_set) &  GHCB_MSR_TERM_REASON_SET_MASK) << GHCB_MSR_TERM_REASON_SET_POS) | \
>>   	((((u64)reason_val) & GHCB_MSR_TERM_REASON_MASK) << GHCB_MSR_TERM_REASON_POS))
>>   
>> +/* Error code from reason set 0 */
> 
> ... Error codes...
> 
Noted.

>> +#define SEV_TERM_SET_GEN		0
>>   #define GHCB_SEV_ES_GEN_REQ		0
>>   #define GHCB_SEV_ES_PROT_UNSUPPORTED	1
>>   
>>   #define GHCB_RESP_CODE(v)		((v) & GHCB_MSR_INFO_MASK)
>>   
>> +/* Linux specific reason codes (used with reason set 1) */
> 
> ... Linux-specific ...

Noted.

> 
>> +#define SEV_TERM_SET_LINUX		1
> 
> GHCB doc says:
> 
> "This document defines and owns reason code set 0x0"
> 
> Should it also say, reason code set 1 is allocated for Linux guest use?
> I don't see why not...
>  > Tom?
> 

If Tom is okay with it then maybe in next version of the GHCB doc can 
add this text.