From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.9]) (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 81A892E3397; Tue, 24 Mar 2026 20:14:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.9 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774383253; cv=none; b=gbTbhOA+DwM1BSBsHitlzoCQWRDVfW6w0OErSQkqiDcYY2ox0y2ZRB4VJSpP5MJVBz0Jfdl3lJXApV1d1uO5ZRvq/q3+LCi120ezzrQzyQ7BRIHJWbel3+MIlRTJsDXLgsICgkkzwW5FLTKkdhHsICuXlA4ww+/EVpsbdQu5GlE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774383253; c=relaxed/simple; bh=cFuFU8YE7cEVhEQVQCkzUpXv5UGSTwcmnJReRP9FaAU=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=YFNB10pCo97b3qY/SdufDwEqbxLJ/AxjdcNxO1ZqWljmfTinqxu+XubNA8z/47Obv5r4sif+ofGQAz7ANx9THnh2FXQeXATYKXIR+v38aqNBFoTSKEBZlmWr8dcVvH5v59Vn1UnRoXEPZDAqdwjgcDAokgcRYciyY2H+WzZsu+k= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=pass smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=EHAiURWq; arc=none smtp.client-ip=192.198.163.9 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="EHAiURWq" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1774383252; x=1805919252; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=cFuFU8YE7cEVhEQVQCkzUpXv5UGSTwcmnJReRP9FaAU=; b=EHAiURWqB+3ybVog7RIm7LsHnIT9RZmtDIydQ3m72JoYvxm4TBPZzO+o yn04ZkEyv9+HiG/lxVyuNWcYsolERO33k5BdKvF73MA0+jP1snYNpp1Kq OxDtxicFP4hurIU/WT1EV3ZB/Rr6b0hg79VZz/jh9eiOKLlAGJ8qXF2u2 663HwUnbbO6g+n3ZFvLfk5ZXWFQaKqIGDnIp6ecQBuHrDY/et/I9VA0Vc DZFcpeFzPsoVs8TjDwmOUagww+h8gb4DlFf2nRxqDzmp+hoXIZUp/6Tcz //S/ovEClJSBDP2ETzZ2BJYPynwoqnaKbu5OLnpBhdMNwrnR7lkNbiPPY Q==; X-CSE-ConnectionGUID: usTPGGUcTseB1Tq79WRRtg== X-CSE-MsgGUID: CmLNsXrkR3CjoxA5UeYDQA== X-IronPort-AV: E=McAfee;i="6800,10657,11739"; a="86109686" X-IronPort-AV: E=Sophos;i="6.23,138,1770624000"; d="scan'208";a="86109686" Received: from fmviesa006.fm.intel.com ([10.60.135.146]) by fmvoesa103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Mar 2026 13:14:11 -0700 X-CSE-ConnectionGUID: AXhwVh04RBOwotUDZEP6Kw== X-CSE-MsgGUID: WEL3bLXtQZKCcEqSV3OuxQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.23,138,1770624000"; d="scan'208";a="219588789" Received: from guptapa-desk.jf.intel.com (HELO desk) ([10.165.239.46]) by fmviesa006-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Mar 2026 13:14:10 -0700 Date: Tue, 24 Mar 2026 13:14:04 -0700 From: Pawan Gupta To: Borislav Petkov Cc: Peter Zijlstra , x86@kernel.org, Nikolay Borisov , "H. Peter Anvin" , Josh Poimboeuf , David Kaplan , Sean Christopherson , Dave Hansen , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , KP Singh , Jiri Olsa , "David S. Miller" , David Laight , Andy Lutomirski , Thomas Gleixner , Ingo Molnar , David Ahern , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , Stanislav Fomichev , Hao Luo , Paolo Bonzini , Jonathan Corbet , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Asit Mallick , Tao Zhang , bpf@vger.kernel.org, netdev@vger.kernel.org, linux-doc@vger.kernel.org Subject: Re: [PATCH v7 07/10] x86/vmscape: Use static_call() for predictor flush Message-ID: <20260324201404.pi45c5anflqdrkgm@desk> References: <20260319-vmscape-bhb-v7-0-b76a777a98af@linux.intel.com> <20260319-vmscape-bhb-v7-7-b76a777a98af@linux.intel.com> <20260319205802.GJ3738786@noisy.programming.kicks-ass.net> <20260319213421.br6na4dulrjm6eke@desk> <20260319214409.GL3738786@noisy.programming.kicks-ass.net> <20260320062206.bdrnmnvho6lhmejw@desk> <20260320090340.GN3738786@noisy.programming.kicks-ass.net> <20260320113134.GAab0wFqe-hewZc175@fat_crate.local> <20260320182308.ahynqzuswlv34wf6@desk> <20260324200026.GCacLtWmhGVOmz832E@fat_crate.local> Precedence: bulk X-Mailing-List: netdev@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: <20260324200026.GCacLtWmhGVOmz832E@fat_crate.local> On Tue, Mar 24, 2026 at 09:00:26PM +0100, Borislav Petkov wrote: > On Fri, Mar 20, 2026 at 11:23:08AM -0700, Pawan Gupta wrote: > > I am curious, what problems do you anticipate? There are nearly 50 > > What's easier when you need to change the underlying implementation: unexport > the static key and touch a bunch of places in the process or simply change the > accessor's body and all the callers don't notice a thing? I see. I switched to accessor in v8 I sent today.