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 84488C433F5 for ; Thu, 17 Mar 2022 22:19:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229514AbiCQWVI (ORCPT ); Thu, 17 Mar 2022 18:21:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56094 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229469AbiCQWVH (ORCPT ); Thu, 17 Mar 2022 18:21:07 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id E78A817B8BB for ; Thu, 17 Mar 2022 15:19:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1647555589; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=hQGIwBER0m+3DWeFVm7NY1/fkMpgtqQj1Lt77v4lZ+w=; b=P0n0AFW0SxxAS4m62EH4G2hinxjlbWFRmAIBbkWw8TVb7Kfnd/Vm8qt5Vt1rFELY+l/sxI +AdS77ZBXQ76VgKgZQFGP2a11yxRq9Tws8nrewq4giwak5uHZLus/l3W0KmEIv02asqAOV IHYWpym1EHaI8F6/4WXfpj0eJxmldaE= Received: from mail-qk1-f197.google.com (mail-qk1-f197.google.com [209.85.222.197]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-608-OwtwWL76M6m7tWuwXEC2AA-1; Thu, 17 Mar 2022 18:19:47 -0400 X-MC-Unique: OwtwWL76M6m7tWuwXEC2AA-1 Received: by mail-qk1-f197.google.com with SMTP id 195-20020a3707cc000000b0067b0c849285so4295166qkh.5 for ; Thu, 17 Mar 2022 15:19:47 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=hQGIwBER0m+3DWeFVm7NY1/fkMpgtqQj1Lt77v4lZ+w=; b=X3+4FTybdJ1Ekrz0FHXHYkTQtDEL61i4pYKA0bcuFPAVndd57m98EuFAgIr5KRCYpz kLdEu1pOmbVGV8HP1qIpiz4INje5LU+uHomH2BJrcDZx/BH6DWVhVCjkZ21WXpZBShHZ gHa8vbZ24exKGDEHx1AFgwo4tFNqbAsMpZhLXK5ic3aKayDYUZa9vNimvx1Q01vG/xNV p1sluiOmhhFkmXOg5ir+873JEBfw4FPU56ZuvkD1SzT4pfmr6oSRjejggN3Ftn/7vX9j RL9lTn0u7l4ZJSHo00LyMSYzDERxh3KQS1ELcHxt0ZdeZJEX0MzcuL1qHZ0EmlYk2idY h86A== X-Gm-Message-State: AOAM531/fUSe3dv++KrxTczYE1eMAgxt8IjQMJcANn6+QyQWmmYByjx2 WA2lG1cLgD/4V+2rmLKdgefM0H6YK7fAZfYQf4LUj3KrHf0RY7zBSBK0JYh1LCBK2rWEDVpUp/8 j70ZDInk3QZCpHilnjvf2EGEB X-Received: by 2002:ac8:7c46:0:b0:2e1:d6c2:2b15 with SMTP id o6-20020ac87c46000000b002e1d6c22b15mr5537939qtv.405.1647555587303; Thu, 17 Mar 2022 15:19:47 -0700 (PDT) X-Google-Smtp-Source: ABdhPJx7ZexznbauwoFGulSphibHkdYv25hNa9G+dJs27LjUY/VCW+59JLVomIg/9lvgrDRIr7gW9w== X-Received: by 2002:ac8:7c46:0:b0:2e1:d6c2:2b15 with SMTP id o6-20020ac87c46000000b002e1d6c22b15mr5537922qtv.405.1647555587028; Thu, 17 Mar 2022 15:19:47 -0700 (PDT) Received: from treble ([2600:1700:6e32:6c00::15]) by smtp.gmail.com with ESMTPSA id p2-20020a05620a15e200b0067d2c0455bcsm2965460qkm.36.2022.03.17.15.19.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 17 Mar 2022 15:19:46 -0700 (PDT) Date: Thu, 17 Mar 2022 15:19:43 -0700 From: Josh Poimboeuf To: Lai Jiangshan Cc: linux-kernel@vger.kernel.org, x86@kernel.org, Lai Jiangshan , Joerg Roedel , Andy Lutomirski , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" Subject: Re: [PATCH] x86/sev: Add ENCODE_FRAME_POINTER after stack changed for #VC Message-ID: <20220317221943.6vhoqx3fdv7py6hi@treble> References: <20220316041612.71357-1-jiangshanlai@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20220316041612.71357-1-jiangshanlai@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Mar 16, 2022 at 12:16:12PM +0800, Lai Jiangshan wrote: > From: Lai Jiangshan > > In idtentry_vc(), the real frame is changed after it switches to new > stack, ENCODE_FRAME_POINTER should be called in case for unwinder. > > Cc: Joerg Roedel > Cc: Josh Poimboeuf > Signed-off-by: Lai Jiangshan > --- > arch/x86/entry/entry_64.S | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S > index e20eabaa56b8..f99f2881ed83 100644 > --- a/arch/x86/entry/entry_64.S > +++ b/arch/x86/entry/entry_64.S > @@ -540,6 +540,7 @@ SYM_CODE_START(\asmsym) > call vc_switch_off_ist > movq %rax, %rsp /* Switch to new stack */ > > + ENCODE_FRAME_POINTER > UNWIND_HINT_REGS > > /* Update pt_regs */ Looks right to me. Any chance you have the ability to test this scenario by unwinding from #VC with CONFIG_FRAME_POINTER? -- Josh