linux-kernel - Re: [PATCH 01/11] KVM: x86: use a separate asm-offsets.c file

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Message-ID: <Y2vB96tzh8GqfmFF@google.com>
Date:   Wed, 9 Nov 2022 15:06:31 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        thomas.lendacky@....com, jmattson@...gle.com,
        stable@...r.kernel.org
Subject: Re: [PATCH 01/11] KVM: x86: use a separate asm-offsets.c file

On Wed, Nov 09, 2022, Paolo Bonzini wrote:
> This already removes the ugly #includes from asm-offsets.c, but especially
> it avoids a future error when asm-offsets will try to include svm/svm.h.
> 
> This would not work for kernel/asm-offsets.c, because svm/svm.h
> includes kvm_cache_regs.h which is not in the include path when
> compiling asm-offsets.c.  The problem is not there if the .c file is
> in arch/x86/kvm.
> 
> Suggested-by: Sean Christopherson <seanjc@...gle.com>
> Cc: stable@...r.kernel.org
> Fixes: a149180fbcf3 ("x86: Add magic AMD return-thunk")
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> ---

Reviewed-by: Sean Christopherson <seanjc@...gle.com>

> diff --git a/arch/x86/kvm/vmx/vmenter.S b/arch/x86/kvm/vmx/vmenter.S
> index 8477d8bdd69c..0b5db4de4d09 100644
> --- a/arch/x86/kvm/vmx/vmenter.S
> +++ b/arch/x86/kvm/vmx/vmenter.S
> @@ -1,12 +1,12 @@
>  /* SPDX-License-Identifier: GPL-2.0 */
>  #include <linux/linkage.h>
>  #include <asm/asm.h>
> -#include <asm/asm-offsets.h>
>  #include <asm/bitsperlong.h>
>  #include <asm/kvm_vcpu_regs.h>
>  #include <asm/nospec-branch.h>
>  #include <asm/percpu.h>
>  #include <asm/segment.h>
> +#include "kvm-asm-offsets.h"

Do you have a preference on KVM files using dashes or underscores?  Outside of
kvm-x86-ops.h and kvm-x86-pmu-ops.h, KVM x86 uses underscores.  I actually prefer
dashes because they're slightly easier to type, but when there are only a few
outliers I constantly mistype the names.  If dashes are generally, maybe we could
gradually/opportunistically move in that direction?