From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="MpSHrWhL" Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.9]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1C710A5; Tue, 5 Dec 2023 13:24:33 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1701811473; x=1733347473; h=message-id:date:mime-version:subject:to:cc:references: from:in-reply-to:content-transfer-encoding; bh=yuu37GSDj8AaEitabvUXj2DsBX2abuuQfqx3Y33N3k4=; b=MpSHrWhLNn/qSJDwtsH0SWvUgapC2fkWTAM0kOQJ9A7lEduZaDgiCcuJ P7Ak1xdAR2Ky7ydBOkrntgYtjNEO/PECR/fql1NgnCM8P6WbKghjj9gX5 UMDsjV+5O3h6XaTDBNTT9V3qoJA5fQAJ6tSpXqmUPD7WgsrS2wpQCHbOZ 7jbSnmZMe72eX20urVDdHpZ7zsl1+3BmsWrUaEt8keQwwu4/scWPe8egz k6A/T72RFSgZJpL2nt3J0E7n8gGJktrKNx1pmCIZJCV1WWuGR3qnmT8QJ aT5B+cAc344iWpNKgwD+cJvsmprhbXe06CDjr5ytC0E4Ki3XbMyZq9r4c w==; X-IronPort-AV: E=McAfee;i="6600,9927,10915"; a="12680176" X-IronPort-AV: E=Sophos;i="6.04,253,1695711600"; d="scan'208";a="12680176" Received: from orsmga003.jf.intel.com ([10.7.209.27]) by orvoesa101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Dec 2023 13:24:32 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10915"; a="720853097" X-IronPort-AV: E=Sophos;i="6.04,253,1695711600"; d="scan'208";a="720853097" Received: from mtvento-mobl1.amr.corp.intel.com (HELO [10.209.56.14]) ([10.209.56.14]) by orsmga003-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Dec 2023 13:24:31 -0800 Message-ID: Date: Tue, 5 Dec 2023 13:24:31 -0800 Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 6/6] x86/vmware: Add TDX hypercall support Content-Language: en-US To: Borislav Petkov , Alexey Makhalov Cc: linux-kernel@vger.kernel.org, virtualization@lists.linux.dev, hpa@zytor.com, dave.hansen@linux.intel.co, bp@alien8.d, mingo@redhat.com, tglx@linutronix.de, x86@kernel.org, netdev@vger.kernel.org, richardcochran@gmail.com, linux-input@vger.kernel.org, dmitry.torokhov@gmail.com, zackr@vmware.com, linux-graphics-maintainer@vmware.com, pv-drivers@vmware.com, namit@vmware.com, timothym@vmware.com, akaher@vmware.com, jsipek@vmware.com, dri-devel@lists.freedesktop.org, daniel@ffwll.ch, airlied@gmail.com, tzimmermann@suse.de, mripard@kernel.org, maarten.lankhorst@linux.intel.com, horms@kernel.org References: <20231122233058.185601-8-amakhalov@vmware.com> <20231201232452.220355-1-amakhalov@vmware.com> <20231201232452.220355-7-amakhalov@vmware.com> <20231204103100.GYZW2qZE9tbGMtuVgY@fat_crate.local> From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 12/4/23 02:31, Borislav Petkov wrote: > On Fri, Dec 01, 2023 at 03:24:52PM -0800, Alexey Makhalov wrote: >> +#ifdef CONFIG_INTEL_TDX_GUEST >> +/* __tdx_hypercall() is not exported. So, export the wrapper */ >> +void vmware_tdx_hypercall_args(struct tdx_module_args *args) >> +{ >> + __tdx_hypercall(args); >> +} >> +EXPORT_SYMBOL_GPL(vmware_tdx_hypercall_args); > Uuuh, lovely. I'd like to see what the TDX folks think about this > export first. I don't really like it much. This does a generic thing (make a TDX hypercall) with a specific name ("vmware_"). If you want to make an argument that a certain chunk of the __tdx_hypercall() space is just for VMWare and you also add a VMWare-specific check and then export *that*, it might be acceptable. But I don't want random modules able to make random, unrestricted TDX hypercalls. That's asking for trouble.