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From: Miguel Ojeda <ojeda@kernel.org>
To: gregkh@linuxfoundation.org,
	Tianrui Zhao <zhaotianrui@loongson.cn>,
	Bibo Mao <maobibo@loongson.cn>,
	Huacai Chen <chenhuacai@kernel.org>
Cc: kvm@vger.kernel.org,
	loongarch@lists.linux.dev,
	Sean Christopherson <seanjc@google.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	chenhuacai@loongson.cn,
	lixianglai@loongson.cn,
	patches@lists.linux.dev,
	stable@vger.kernel.org
Subject: Re: [PATCH 6.18 091/270] LoongArch: KVM: Compile switch.S directly into the kernel
Date: Tue, 12 May 2026 22:52:50 +0200
Message-ID: <20260512205250.313933-1-ojeda@kernel.org>
In-Reply-To: <20260512173940.376401154@linuxfoundation.org>
References: <20260512173940.376401154@linuxfoundation.org>
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On Tue, 12 May 2026 19:38:12 +0200 Greg Kroah-Hartman <gregkh@linuxfoundation.org> wrote:
>
> 6.18-stable review patch.  If anyone has any objections, please let me know.
>
> ------------------
>
> From: Xianglai Li <lixianglai@loongson.cn>
>
> commit 5203012fa6045aac4b69d4e7c212e16dcf38ef10 upstream.
>
> If we directly compile the switch.S file into the kernel, the address of
> the kvm_exc_entry function will definitely be within the DMW memory area.
> Therefore, we will no longer need to perform a copy relocation of the
> kvm_exc_entry.
>
> So this patch compiles switch.S directly into the kernel, and then remove
> the copy relocation execution logic for the kvm_exc_entry function.
>
> Cc: stable@vger.kernel.org
> Signed-off-by: Xianglai Li <lixianglai@loongson.cn>
> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

For loongarch64, I am seeing a bunch of errors like:

    arch/loongarch/kvm/switch.S:201:1: error: unrecognized instruction mnemonic
    EXPORT_SYMBOL_FOR_KVM(kvm_exc_entry)
    ^

`EXPORT_SYMBOL_FOR_KVM` does not exist in 6.18. Does this need a subset
of commit 6276c67f2bc4 ("x86: Restrict KVM-induced symbol exports to KVM
modules where obvious/possible")?

Cc'ing a few folks...

Thanks!

Cheers,
Miguel