From nobody Tue Nov 11 17:33:23 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1564411992; cv=none; d=zoho.com; s=zohoarc; b=JdswYKdEm580YpZHZs7X/X/rLuzDuq2yoXhQdZZgymFYBaoaV4/WHBDz+KTBxKJN+w4RXSEdjmUsuHcyRQcbW/zC5YJ4HNflikyn0fSYqMAnngdxaxZQ74EGeJUueyq/N+1uo9dl1BaOBX1QzoJqOhLzEtpTHiH012QrWv5dQZM= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1564411992; h=Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:Message-ID:References:Sender:Subject:To:ARC-Authentication-Results; bh=c/m1sDgNc3HC/8V4Fux9Xv9u8Gxk8vBiyFZlgQO2OY0=; b=i8xTs4H1Bx4Rzviy96WYl/b9l9Yvc5oQOWLVXzs/jm2c+gnoNQAfouJ6WtA052AtqLjBTNqULu+9HgPWNR9SksXrdd718AzKHFxiT7Wt4Kz5JVF5JKNeYRJbrGABjzwq96WjPEGY0Ijs5IeAcWM4JOmK/vtrdcD1Ps0DN/GF7i4= ARC-Authentication-Results: i=1; mx.zoho.com; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1564411992946913.6278675424028; Mon, 29 Jul 2019 07:53:12 -0700 (PDT) Received: from localhost ([::1]:52802 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hs71T-0000MU-SF for importer@patchew.org; Mon, 29 Jul 2019 10:53:11 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:36390) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hs70w-0007yu-7s for qemu-devel@nongnu.org; Mon, 29 Jul 2019 10:52:39 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hs70v-0000Si-9w for qemu-devel@nongnu.org; Mon, 29 Jul 2019 10:52:38 -0400 Received: from mx1.redhat.com ([209.132.183.28]:60604) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hs70v-0000SP-5A; Mon, 29 Jul 2019 10:52:37 -0400 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 7EBFB308427D; Mon, 29 Jul 2019 14:52:36 +0000 (UTC) Received: from dell-r430-03.lab.eng.brq.redhat.com (dell-r430-03.lab.eng.brq.redhat.com [10.37.153.18]) by smtp.corp.redhat.com (Postfix) with ESMTP id 85F835D9C8; Mon, 29 Jul 2019 14:52:35 +0000 (UTC) From: Igor Mammedov To: qemu-devel@nongnu.org Date: Mon, 29 Jul 2019 10:52:28 -0400 Message-Id: <20190729145229.4333-2-imammedo@redhat.com> In-Reply-To: <20190729145229.4333-1-imammedo@redhat.com> References: <20190729145229.4333-1-imammedo@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.40]); Mon, 29 Jul 2019 14:52:36 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH RFC 1/2] memory: make MemoryRegion alias migratable X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: pbonzini@redhat.com, qemu-s390x@nongnu.org, dgilbert@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" use qemu_ram_alloc_from_ptr() to create aliased RAMBlock to the part of original memory region. Signed-off-by: Igor Mammedov --- exec.c | 7 ++++--- memory.c | 5 +++++ 2 files changed, 9 insertions(+), 3 deletions(-) diff --git a/exec.c b/exec.c index 3e78de3b8f..daef0cd54f 100644 --- a/exec.c +++ b/exec.c @@ -2313,7 +2313,7 @@ static void ram_block_add(RAMBlock *new_block, Error = **errp, bool shared) new_block->used_length, DIRTY_CLIENTS_ALL); =20 - if (new_block->host) { + if (new_block->host && !new_block->mr->alias) { qemu_ram_setup_dump(new_block->host, new_block->max_length); qemu_madvise(new_block->host, new_block->max_length, QEMU_MADV_HUG= EPAGE); /* MADV_DONTFORK is also needed by KVM in absence of synchronous M= MU */ @@ -2671,7 +2671,8 @@ RAMBlock *qemu_ram_block_from_host(void *ptr, bool ro= und_offset, =20 rcu_read_lock(); block =3D atomic_rcu_read(&ram_list.mru_block); - if (block && block->host && host - block->host < block->max_length) { + if (block && !block->mr->alias && block->host && + host - block->host < block->max_length) { goto found; } =20 @@ -2680,7 +2681,7 @@ RAMBlock *qemu_ram_block_from_host(void *ptr, bool ro= und_offset, if (block->host =3D=3D NULL) { continue; } - if (host - block->host < block->max_length) { + if (!block->mr->alias && host - block->host < block->max_length) { goto found; } } diff --git a/memory.c b/memory.c index 5d8c9a9234..d710c17a26 100644 --- a/memory.c +++ b/memory.c @@ -1678,6 +1678,11 @@ void memory_region_init_alias(MemoryRegion *mr, memory_region_init(mr, owner, name, size); mr->alias =3D orig; mr->alias_offset =3D offset; + if (orig->ram_block && size) { + mr->ram_block =3D qemu_ram_alloc_from_ptr(size, + orig->ram_block->host + of= fset, + mr, &error_fatal); + } } =20 void memory_region_init_rom_nomigrate(MemoryRegion *mr, --=20 2.18.1