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 8882AC433EF for ; Thu, 17 Mar 2022 14:57:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235562AbiCQO6S (ORCPT ); Thu, 17 Mar 2022 10:58:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47042 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235566AbiCQO6Q (ORCPT ); Thu, 17 Mar 2022 10:58:16 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3D0352042BB for ; Thu, 17 Mar 2022 07:56:54 -0700 (PDT) From: Thomas Gleixner DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1647529012; 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=1SNPcSHU+CM7EhtR1qixOFb9nT6804xY8a1v51dj1a8=; b=C4eat0tGTQhNy4zvdWI7Qb2TCGcQEqEejUT/ppWcGq4OjkpmZ3K1CRIVFtpHslTw3vCrXv az94VXfYuGMYd7dcxLN3VURgFpURUU+/YYHJ+tHP4ictN0N9/5RLZtNm/hASzC/LMkKaN/ Qu1mv8O3Z8n7Rzyk2MOCICmhK/uYGJi6c2b8vPswdkP5BIDNlrAa/8lfJrbHBlXT1SVTIk BmE6i3fJLkZjeWe2OCOY3U4L167dCvvGM10gRmePDEnFhWy4gD3txJ3IJKXzC4zlVoZthl QE84AhB9lV3CPm5rhnXuWgwqSJugMKxloAH1dWdkHSyLOZ7WqJTQv5aR5SbU1w== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1647529012; 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=1SNPcSHU+CM7EhtR1qixOFb9nT6804xY8a1v51dj1a8=; b=ETgmRl64KLtz3mLUlwA1OIgiIyETCdYhpe2ucFfiCA0DRxVX6zUzyTseQ7Uqa63gLZU0JA DppixLKrWP99mYDA== To: "Kirill A. Shutemov" , mingo@redhat.com, bp@alien8.de, dave.hansen@intel.com, luto@kernel.org, peterz@infradead.org Cc: sathyanarayanan.kuppuswamy@linux.intel.com, aarcange@redhat.com, ak@linux.intel.com, dan.j.williams@intel.com, david@redhat.com, hpa@zytor.com, jgross@suse.com, jmattson@google.com, joro@8bytes.org, jpoimboe@redhat.com, knsathya@kernel.org, pbonzini@redhat.com, sdeep@vmware.com, seanjc@google.com, tony.luck@intel.com, vkuznets@redhat.com, wanpengli@tencent.com, thomas.lendacky@amd.com, brijesh.singh@amd.com, x86@kernel.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" Subject: Re: [PATCHv6 26/30] x86/mm/cpa: Add support for TDX shared memory In-Reply-To: <20220316020856.24435-27-kirill.shutemov@linux.intel.com> References: <20220316020856.24435-1-kirill.shutemov@linux.intel.com> <20220316020856.24435-27-kirill.shutemov@linux.intel.com> Date: Thu, 17 Mar 2022 15:56:52 +0100 Message-ID: <87o824d3uz.ffs@tglx> MIME-Version: 1.0 Content-Type: text/plain Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Mar 16 2022 at 05:08, Kirill A. Shutemov wrote: > Intel TDX protects guest memory from VMM access. Any memory that is > required for communication with the VMM must be explicitly shared. > > It is a two-step process: the guest sets the shared bit in the page > table entry and notifies VMM about the change. The notification happens > using MapGPA hypercall. > > Conversion back to private memory requires clearing the shared bit, > notifying VMM with MapGPA hypercall following with accepting the memory > with AcceptPage hypercall. > > Provide a TDX version of x86_platform.guest.* callbacks. It makes > __set_memory_enc_pgtable() work right in TDX guest. > > Signed-off-by: Kirill A. Shutemov Reviewed-by: Thomas Gleixner