linux-kernel - Re: [RFC PATCH V3 12/16] x86/sev: Add a #HV exception handler

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Message-ID: <7dbc845a-0ada-f97a-ba50-a6b2c31ee9c0@gmail.com>
Date:   Fri, 3 Feb 2023 15:27:11 +0800
From:   Tianyu Lan <ltykernel@...il.com>
To:     "Gupta, Pankaj" <pankaj.gupta@....com>, luto@...nel.org,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
        seanjc@...gle.com, pbonzini@...hat.com, jgross@...e.com,
        tiala@...rosoft.com, kirill@...temov.name,
        jiangshan.ljs@...group.com, peterz@...radead.org,
        ashish.kalra@....com, srutherford@...gle.com,
        akpm@...ux-foundation.org, anshuman.khandual@....com,
        pawan.kumar.gupta@...ux.intel.com, adrian.hunter@...el.com,
        daniel.sneddon@...ux.intel.com, alexander.shishkin@...ux.intel.com,
        sandipan.das@....com, ray.huang@....com, brijesh.singh@....com,
        michael.roth@....com, thomas.lendacky@....com,
        venu.busireddy@...cle.com, sterritt@...gle.com,
        tony.luck@...el.com, samitolvanen@...gle.com, fenghua.yu@...el.com
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        linux-hyperv@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [RFC PATCH V3 12/16] x86/sev: Add a #HV exception handler

On 1/23/2023 3:33 PM, Gupta, Pankaj wrote:
> 
>> + */
>> +.macro idtentry_hv vector asmsym cfunc
>> +SYM_CODE_START(\asmsym)
>> +    UNWIND_HINT_IRET_REGS
>> +    ASM_CLAC
> 
> Did you get a chance to review the new instructions
> added at the start similar to idtentry_vc and comments
> added assuggested here?
> 
> https://lore.kernel.org/lkml/16e50239-39b2-4fb4-5110-18f13ba197fe@amd.com/

Hi Pankaj:
	Thanks for your reminder. Yes, CLD should be add after ASM_CLAC. Will 
fix it.