From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0D5224D7964 for ; Fri, 25 Sep 2026 16:17:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790353060; cv=none; b=exuj2a2jYMV/x5K3c06eQLjqLPom9PgqNftbMF8kXJGgNUlBNY1fiyYLZjPufOQS/TO3i/NE2jVVEmpNAkL6Ch431WTA1plH5/ihfs7kfq84exhJSFj0Vx5Sh4aXqCcP0QPHtxHQWgSuMrN5RNG9F6XqzQwFFvemaPC2HVoTSEc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790353060; c=relaxed/simple; bh=n3OaTTQ8bUEFuL4qBBZlEwXO0QWVTkRwwP//HV9Kmr8=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=R/O8OQlm+mDd3mJ0x+IiReH4NzZ6EBrlbLvGHTg5uJkUhZAdwjKb6kEk9b4vAzf2i8u7pXTRngsVjPthD/RL0pjZN9r8eO6uRqO78sh1G7MLksMjwhquqCFp3gCtZv8tRyOCbgp2UQ8oGXq4JVH2ipjKFAKMGOa4UUiP/bb+PiI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=E3VaIlKj; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="E3VaIlKj" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CC8C51F000FF; Fri, 25 Sep 2026 16:17:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790353058; bh=dXF5FonPJsOGWH5zY3O+RL076bJTH/mSCOISs9AU/m8=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=E3VaIlKjwNttguPmdFxO8NkjU5z4yDZ3XYoC+Vj0o1yg2y4hxnbrjoCapJoLS0z2r Jnq798a8ZtMHkX7IKRDrGBpkJYVPCC1Z3Iqdm53NCYG2FBGMHk/8d0/VLexmlT4t28 w35TrObQ+qxnVsZZNsdJxAZfXcVMHQoGe+padk2H7zx5sj5t2mqx7aEesR6ti+mhi2 gtNIFeMEjaQGFqM1TheI6OL4A8SApPHfoyDTse5PUbwXYC/cnykOgM6Fcsmv5OVIrb xd0rYJwUqwY7NH5iw5TpC6VnIqkGlOC8OMU7q5BIW7dhc7X1D2fqJQ+ojZAfoizFJT yP9ARr7oVNVHA== Date: Fri, 25 Sep 2026 21:39:02 +0530 From: Naveen N Rao To: Borislav Petkov Cc: Dave Hansen , linux-kernel@vger.kernel.org, x86@kernel.org, Thomas Gleixner , Ingo Molnar , Bharata B Rao , Manali Shukla , Nikunj A Dadhania , "H. Peter Anvin" Subject: Re: [PATCH RESEND v4 2/3] x86/apic: Introduce a variable to track the number of EILVT registers Message-ID: References: <99275fc7531b5c8708e2be8459251c9169b0ce63.1788425679.git.naveen@kernel.org> <20260922053610.GBarITypxf7zPAB83g@fat_crate.local> <20260925042612.GCarX35LHhl65JavXf@fat_crate.local> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260925042612.GCarX35LHhl65JavXf@fat_crate.local> On Thu, Sep 24, 2026 at 09:26:12PM -0700, Borislav Petkov wrote: > On Thu, Sep 24, 2026 at 05:28:48PM +0530, Naveen N Rao wrote: > > Cause I didn't want to risk changing the current default EILVT register > > count for some ~2 decade old processor that may be advertising > > X86_FEATURE_EXTAPIC but encoding a count of zero in APIC_EFEAT. > > Do you know of such a processor? I don't. > > Because Christian gave you all regs count from K8 onwards and that's what we > support anyway. I don't care about K7 rust and older. Sure, will change to the version you proposed. > > > Right, the split reflects how I viewed the changes, and to hopefully > > simplify the review. Looks like I got the split wrong as it looks to > > have been counter-productive here. > > Right, just keep it simple and do a single patch. Will do. Thanks, Naveen