Re: [PATCH v3] x86/virt/tdx: Do not print error message on non-present feature

[Xiaoyao Li <xiaoyao.li@intel.com>]

On 11/2/2026 2:51 PM, Jiri Slaby (SUSE) wrote:
> Before commit 165e77353831 below, the kernel did not print anything
> during boot if X86_FEATURE_TDX_HOST_PLATFORM was not present, unless TDX
> enablement was explicitly requested via a module parameter.
> 
> After the commit, when attempting to load TDX automatically, this is
> emitted to the log:
>   virt/tdx: TDX not supported by the host platform
> 
> It is emitted with the "error" level, hence it is disturbing. It is not
> an error to run CPUs without the feature.
> 
> Drop this silent-boot-breaking error message for the automatic
> initialization path.
> 
> Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
> Fixes: 165e77353831 ("KVM: x86/tdx: Do VMXON and TDX-Module initialization during subsys init")
> Reviewed-by: Kiryl Shutsemau (Meta) <kas@kernel.org>
> Reviewed-by: Nikolay Borisov <nik.borisov@suse.com>
> Reviewed-by: Sean Christopherson <seanjc@google.com>
> Reviewed-by: Rick Edgecombe <rick.p.edgecombe@intel.com>

Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>

> Cc: Dan Williams <dan.j.williams@intel.com>
> Cc: Chao Gao <chao.gao@intel.com>
> Cc: Dave Hansen <dave.hansen@linux.intel.com>
> 
> ---
> 
> [v3] add reviewed-by tags and resend
> [v2] update the commit message.
> 
> Cc: Thomas Gleixner <tglx@kernel.org>
> Cc: Ingo Molnar <mingo@redhat.com>
> Cc: Borislav Petkov <bp@alien8.de>
> Cc: Dave Hansen <dave.hansen@linux.intel.com>
> Cc: x86@kernel.org
> Cc: "H. Peter Anvin" <hpa@zytor.com>
> Cc: linux-kernel@vger.kernel.org
> Cc: linux-coco@lists.linux.dev
> Cc: kvm@vger.kernel.org
> ---
>  arch/x86/virt/vmx/tdx/tdx.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/arch/x86/virt/vmx/tdx/tdx.c b/arch/x86/virt/vmx/tdx/tdx.c
> index 680e5178a86f..d910a290ac50 100644
> --- a/arch/x86/virt/vmx/tdx/tdx.c
> +++ b/arch/x86/virt/vmx/tdx/tdx.c
> @@ -1276,10 +1276,8 @@ static __init int tdx_enable(void)
>  	enum cpuhp_state state;
>  	int ret;
>  
> -	if (!cpu_feature_enabled(X86_FEATURE_TDX_HOST_PLATFORM)) {
> -		pr_err("TDX not supported by the host platform\n");
> +	if (!cpu_feature_enabled(X86_FEATURE_TDX_HOST_PLATFORM))
>  		return -ENODEV;
> -	}
>  
>  	if (!cpu_feature_enabled(X86_FEATURE_XSAVE)) {
>  		pr_err("XSAVE is required for TDX\n");