From patchwork Fri Jul 24 02:57:37 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Gibson X-Patchwork-Id: 11681909 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 5E202722 for ; Fri, 24 Jul 2020 02:57:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D1373206C1 for ; Fri, 24 Jul 2020 02:57:50 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=gibson.dropbear.id.au header.i=@gibson.dropbear.id.au header.b="n+0JQilQ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726667AbgGXC5t (ORCPT ); Thu, 23 Jul 2020 22:57:49 -0400 Received: from ozlabs.org ([203.11.71.1]:53183 "EHLO ozlabs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726381AbgGXC5t (ORCPT ); Thu, 23 Jul 2020 22:57:49 -0400 Received: by ozlabs.org (Postfix, from userid 1007) id 4BCYlv5VC5z9sTC; Fri, 24 Jul 2020 12:57:47 +1000 (AEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gibson.dropbear.id.au; s=201602; t=1595559467; bh=HmcdQhqv6u0WvbSTqY3hEVc0yzPwYsuoT3bUsWyJi1A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=n+0JQilQDIIAqWIav0HdtD8GraIx0bzBq46AppmC0VpVi9JpX1ocIHF453u/sZEj+ KZm03zv0/a5pF6t4mrGFmXShx35yH7G+SO1peo8tUOVUlc0AzoFSC6IgJi18fgSyp1 X4ejxuJxqNWUobrouQrOCxr/nMMaiaqWZ+ITBYz8= From: David Gibson To: dgilbert@redhat.com, frankja@linux.ibm.com, pair@us.ibm.com, qemu-devel@nongnu.org, pbonzini@redhat.com, brijesh.singh@amd.com Cc: ehabkost@redhat.com, marcel.apfelbaum@gmail.com, "Michael S. Tsirkin" , qemu-ppc@nongnu.org, kvm@vger.kernel.org, pasic@linux.ibm.com, qemu-s390x@nongnu.org, David Gibson , David Hildenbrand , Christian Borntraeger , Richard Henderson , =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= , mdroth@linux.vnet.ibm.com, Thomas Huth , Cornelia Huck , Richard Henderson Subject: [for-5.2 v4 03/10] host trust limitation: Move side effect out of machine_set_memory_encryption() Date: Fri, 24 Jul 2020 12:57:37 +1000 Message-Id: <20200724025744.69644-4-david@gibson.dropbear.id.au> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200724025744.69644-1-david@gibson.dropbear.id.au> References: <20200724025744.69644-1-david@gibson.dropbear.id.au> MIME-Version: 1.0 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org When the "memory-encryption" property is set, we also disable KSM merging for the guest, since it won't accomplish anything. We want that, but doing it in the property set function itself is thereoretically incorrect, in the unlikely event of some configuration environment that set the property then cleared it again before constructing the guest. More importantly, it makes some other cleanups we want more difficult. So, instead move this logic to machine_run_board_init() conditional on the final value of the property. Signed-off-by: David Gibson Reviewed-by: Richard Henderson --- hw/core/machine.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) diff --git a/hw/core/machine.c b/hw/core/machine.c index 2f881d6d75..035a1fc631 100644 --- a/hw/core/machine.c +++ b/hw/core/machine.c @@ -432,14 +432,6 @@ static void machine_set_memory_encryption(Object *obj, const char *value, g_free(ms->memory_encryption); ms->memory_encryption = g_strdup(value); - - /* - * With memory encryption, the host can't see the real contents of RAM, - * so there's no point in it trying to merge areas. - */ - if (value) { - machine_set_mem_merge(obj, false, errp); - } } static bool machine_get_nvdimm(Object *obj, Error **errp) @@ -1131,6 +1123,15 @@ void machine_run_board_init(MachineState *machine) } } + if (machine->memory_encryption) { + /* + * With host trust limitation, the host can't see the real + * contents of RAM, so there's no point in it trying to merge + * areas. + */ + machine_set_mem_merge(OBJECT(machine), false, &error_abort); + } + machine_class->init(machine); }