linux-kernel - Re: [PATCH 1/2] x86/fred: Always install system interrupt handler into IDT

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Date: Tue, 25 Jun 2024 14:31:08 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: Xin Li <xin@...or.com>, Hou Wenlong <houwenlong.hwl@...group.com>,
 linux-kernel@...r.kernel.org
Cc: Lai Jiangshan <jiangshan.ljs@...group.com>, Ingo Molnar
 <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, Dave Hansen
 <dave.hansen@...ux.intel.com>, x86@...nel.org, "H. Peter Anvin"
 <hpa@...or.com>, Xin Li <xin3.li@...el.com>, Jacob Pan
 <jacob.jun.pan@...ux.intel.com>, Rick Edgecombe
 <rick.p.edgecombe@...el.com>, Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [PATCH 1/2] x86/fred: Always install system interrupt handler
 into IDT

On Tue, Jun 25 2024 at 02:19, Xin Li wrote:
> On 6/21/2024 6:12 AM, Hou Wenlong wrote:
>> diff --git a/arch/x86/include/asm/idtentry.h b/arch/x86/include/asm/idtentry.h
>> index d4f24499b256..daee9f7765bc 100644
>> --- a/arch/x86/include/asm/idtentry.h
>> +++ b/arch/x86/include/asm/idtentry.h
>> @@ -470,8 +470,7 @@ static inline void fred_install_sysvec(unsigned int vector, const idtentry_t fun
>>   #define sysvec_install(vector, function) {				\
>>   	if (cpu_feature_enabled(X86_FEATURE_FRED))			\
>>   		fred_install_sysvec(vector, function);			\
>> -	else								\
>> -		idt_install_sysvec(vector, asm_##function);		\
>
> empty line, it improves readability.
>
> And please put a comment here to explain why this is unconditionally
> done for IDT.

Wait. If we need this during early boot, then why don't we enable FRED
earlier?

Thanks,

        tglx