linux-kernel - Re: [RFC 3/5] powerpc: kvm: drop 32-bit book3s

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Message-Id: <e5b03a9f-332f-4a13-84c6-6b739cd5aa25@app.fastmail.com>
Date: Fri, 13 Dec 2024 11:39:00 +0100
From: "Arnd Bergmann" <arnd@...db.de>
To: "Christophe Leroy" <christophe.leroy@...roup.eu>,
 "Arnd Bergmann" <arnd@...nel.org>, kvm@...r.kernel.org
Cc: "Thomas Bogendoerfer" <tsbogend@...ha.franken.de>,
 "Huacai Chen" <chenhuacai@...nel.org>,
 "Jiaxun Yang" <jiaxun.yang@...goat.com>,
 "Michael Ellerman" <mpe@...erman.id.au>,
 "Nicholas Piggin" <npiggin@...il.com>,
 "Naveen N Rao" <naveen@...nel.org>,
 "Madhavan Srinivasan" <maddy@...ux.ibm.com>,
 "Alexander Graf" <graf@...zon.com>, "Crystal Wood" <crwood@...hat.com>,
 "Anup Patel" <anup@...infault.org>,
 "Atish Patra" <atishp@...shpatra.org>,
 "Paul Walmsley" <paul.walmsley@...ive.com>,
 "Palmer Dabbelt" <palmer@...belt.com>,
 "Albert Ou" <aou@...s.berkeley.edu>,
 "Sean Christopherson" <seanjc@...gle.com>,
 "Paolo Bonzini" <pbonzini@...hat.com>,
 "Thomas Gleixner" <tglx@...utronix.de>, "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>,
 "Vitaly Kuznetsov" <vkuznets@...hat.com>,
 "David Woodhouse" <dwmw2@...radead.org>, "Paul Durrant" <paul@....org>,
 "Marc Zyngier" <maz@...nel.org>, linux-kernel@...r.kernel.org,
 linux-mips@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
 kvm-riscv@...ts.infradead.org, linux-riscv@...ts.infradead.org
Subject: Re: [RFC 3/5] powerpc: kvm: drop 32-bit book3s

On Fri, Dec 13, 2024, at 11:27, Christophe Leroy wrote:
> Le 13/12/2024 à 11:04, Arnd Bergmann a écrit :
>> diff --git a/arch/powerpc/kernel/head_32.h b/arch/powerpc/kernel/head_32.h
>> index 9cba7dbf58dd..24e89dadc74d 100644
>> --- a/arch/powerpc/kernel/head_32.h
>> +++ b/arch/powerpc/kernel/head_32.h
>> @@ -172,7 +172,6 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt)
>>   #define	START_EXCEPTION(n, label)		\
>>   	__HEAD;					\
>>   	. = n;					\
>> -	DO_KVM n;				\
>>   label:
>>   
>>   #else
>
> Then the complete macro should go away because both versions are now 
> identical:
>
> -#ifdef CONFIG_PPC_BOOK3S
> -#define	START_EXCEPTION(n, label)		\
> -	__HEAD;					\
> -	. = n;					\
> -label:
> -
> -#else
>   #define	START_EXCEPTION(n, label)		\
>   	__HEAD;					\
>   	. = n;					\
>   label:
>

Thanks, I've folded that change into my patch now.

      Arnd