linux-kernel - Re: [RFC][PATCH 6/8] module: Add module specific symbol namespace support

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Message-ID: <20241112091801.GK22801@noisy.programming.kicks-ass.net>
Date: Tue, 12 Nov 2024 10:18:01 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Sean Christopherson <seanjc@...gle.com>
Cc: Christoph Hellwig <hch@...radead.org>, mcgrof@...nel.org,
	x86@...nel.org, hpa@...or.com, petr.pavlu@...e.com,
	samitolvanen@...gle.com, da.gomez@...sung.com, masahiroy@...nel.org,
	nathan@...nel.org, nicolas@...sle.eu, linux-kernel@...r.kernel.org,
	linux-modules@...r.kernel.org, linux-kbuild@...r.kernel.org,
	gregkh@...uxfoundation.org
Subject: Re: [RFC][PATCH 6/8] module: Add module specific symbol namespace
 support

On Mon, Nov 11, 2024 at 10:36:16AM -0800, Sean Christopherson wrote:
> E.g. for x86, something like:
> 
> #if IS_MODULE(CONFIG_KVM_AMD) && IS_MODULE(CONFIG_KVM_INTEL)
> #define KVM_VENDOR_MODULES kvm-amd,kvm-intel
> #elif IS_MODULE(CONFIG_KVM_AMD)
> #define KVM_VENDOR_MODULES kvm-amd
> #elif IS_MODULE(CONFIG_KVM_INTEL)
> #define KVM_VENDOR_MODULES kvm-intel
> #else
> #undef KVM_VENDOR_MODULES
> #endif
> 
> #ifdef KVM_VENDOR_MODULES
> static_assert(IS_MODULE(CONFIG_KVM_X86));
> 
> #define EXPORT_SYMBOL_GPL_FOR_KVM_INTERNAL(symbol) \
> 	EXPORT_SYMBOL_GPL_FOR(symbol, __stringify(KVM_VENDOR_MODULES))
> #define EXPORT_SYMBOL_GPL_FOR_KVM(symbol) \
> 	EXPORT_SYMBOL_GPL_FOR(symbol, "kvm," __stringify(KVM_VENDOR_MODULES))
> #else
> EXPORT_SYMBOL_GPL_FOR_KVM_INTERNAL(symbol)
> EXPORT_SYMBOL_GPL_FOR_KVM(symbol)
> #endif

I see no problem with KVM doing something like this on top of whatever
we end up with.