linux-kernel - Re: [RFC PATCH V2 16/18] x86/sev: Initialize #HV doorbell and handle interrupt requests

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Message-ID: <c3123488-1623-831e-783f-dae215b3f457@gmail.com>
Date:   Thu, 8 Dec 2022 22:21:34 +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 V2 16/18] x86/sev: Initialize #HV doorbell and handle
 interrupt requests

On 12/7/2022 10:13 PM, Gupta, Pankaj wrote:
>> +#endif
>> +}
>> +
>>   static __always_inline void native_irq_disable(void)
>>   {
>>       asm volatile("cli": : :"memory");
>> @@ -43,6 +59,9 @@ static __always_inline void native_irq_disable(void)
>>   static __always_inline void native_irq_enable(void)
>>   {
>>       asm volatile("sti": : :"memory");
>> +#ifdef CONFIG_AMD_MEM_ENCRYPT
>> +    check_hv_pending(NULL);
> 
> Just trying to understand when regs will be NULL?

check_hv_pending() will be divided into two functions.

The one handles #hv event in the #HV exception code path.
The other one handles pending irq event in the irq re-enable
code path。 In this version, the "regs = NULL" for check_hv_pending()
is used in the irq re-enable code path.