From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 17945C7EE24 for ; Tue, 16 May 2023 09:31:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231727AbjEPJa7 (ORCPT ); Tue, 16 May 2023 05:30:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42708 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231515AbjEPJa5 (ORCPT ); Tue, 16 May 2023 05:30:57 -0400 Received: from desiato.infradead.org (desiato.infradead.org [IPv6:2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C147210D0; Tue, 16 May 2023 02:30:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=apBn1EFR3UasmwGfKeh9ooAeyRlPEBSFLy2WBjKEN7E=; b=n48b0d65hHNOhYTlqWwDTWMLKy fGenR9fuC7m+jVG2JDDUsVWEvFksHS4X27aKwlflrZyV1aOBbk86fNoLo6nusuSDKCPsFDGnz6Sj5 czzclcmrgDDvRyz/4LkWH8UG/CwIEV0T1CZjyEyP5QHbR432EhHMx7COCAAAesdUmzlGKi89h5tPe fJDXv0hZ3g88X0pkv7XAYNEOI5d3oLKscmzRkwJP18Kp2z8y4QkLf6UgsEsRmoG/Bby+sJ9gvBTS5 Ra36d5Zmr4kdi/oMmisucT+tsfmnh39yDeFNiAxAU4SSGADjPz26H39+NwWy08CTafV8MzlvKUwd4 6K+g7VYw==; Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.96 #2 (Red Hat Linux)) id 1pyr0X-00C4X3-0P; Tue, 16 May 2023 09:30:16 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id F0ABB3000DC; Tue, 16 May 2023 11:30:10 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id D74BB20118D79; Tue, 16 May 2023 11:30:10 +0200 (CEST) Date: Tue, 16 May 2023 11:30:10 +0200 From: Peter Zijlstra To: Tianyu Lan Cc: luto@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, seanjc@google.com, pbonzini@redhat.com, jgross@suse.com, tiala@microsoft.com, kirill@shutemov.name, jiangshan.ljs@antgroup.com, ashish.kalra@amd.com, srutherford@google.com, akpm@linux-foundation.org, anshuman.khandual@arm.com, pawan.kumar.gupta@linux.intel.com, adrian.hunter@intel.com, daniel.sneddon@linux.intel.com, alexander.shishkin@linux.intel.com, sandipan.das@amd.com, ray.huang@amd.com, brijesh.singh@amd.com, michael.roth@amd.com, thomas.lendacky@amd.com, venu.busireddy@oracle.com, sterritt@google.com, tony.luck@intel.com, samitolvanen@google.com, fenghua.yu@intel.com, pangupta@amd.com, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-arch@vger.kernel.org Subject: Re: [RFC PATCH V6 01/14] x86/sev: Add a #HV exception handler Message-ID: <20230516093010.GC2587705@hirez.programming.kicks-ass.net> References: <20230515165917.1306922-1-ltykernel@gmail.com> <20230515165917.1306922-2-ltykernel@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230515165917.1306922-2-ltykernel@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, May 15, 2023 at 12:59:03PM -0400, Tianyu Lan wrote: > From: Tianyu Lan > > Add a #HV exception handler that uses IST stack. > Urgh.. that is entirely insufficient. Like it doesn't even begin to start to cover things. The whole existing VC IST stack abuse is already a nightmare and you're duplicating that.. without any explanation for why this would be needed and how it is correct. Please try again.