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a="185278595" X-IronPort-AV: E=Sophos;i="5.83,259,1616482800"; d="scan'208";a="185278595" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Jun 2021 11:15:26 -0700 IronPort-SDR: ggbw/1coGDq1tkQBJ0zHUZoR3r/iDHTweQ4qKJGKPXJgLh7pLu5/gq4Qox/wMpMjdftzG+6kXG +9QpbCj4coww== X-IronPort-AV: E=Sophos;i="5.83,259,1616482800"; d="scan'208";a="637725608" Received: from ciball-mobl1.amr.corp.intel.com (HELO [10.252.140.48]) ([10.252.140.48]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Jun 2021 11:15:26 -0700 Subject: Re: [RFC v2 08/32] x86/traps: Add #VE support for TDX guest To: Andi Kleen , Sean Christopherson Cc: Kuppuswamy Sathyanarayanan , Peter Zijlstra , Andy Lutomirski , Dan Williams , Tony Luck , Kirill Shutemov , Kuppuswamy Sathyanarayanan , Raj Ashok , linux-kernel@vger.kernel.org References: <8a1d6930f784cb57c957cf20cea870947db91e05.1619458733.git.sathyanarayanan.kuppuswamy@linux.intel.com> <42f6b603-7c21-28fa-b6ec-e53268aa6ff7@intel.com> <3afaebee-77dc-83ff-c397-aa64991c52be@linux.intel.com> From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <3afaebee-77dc-83ff-c397-aa64991c52be@linux.intel.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 6/8/21 11:12 AM, Andi Kleen wrote: > I believe neither does mmio/msr normally (except maybe > ftrace+tp_printk, but that will likely work because it shouldn't > recurse more than once due to ftrace's reentry protection) Can it do MMIO: > +DEFINE_IDTENTRY(exc_virtualization_exception) > +{ =======> HERE > + ret = tdg_get_ve_info(&ve); Recursion isn't the problem. It would double-fault there, right?