From nobody Mon Feb 9 13:37:58 2026 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=1555335047; cv=none; d=zoho.com; s=zohoarc; b=YQJA3NfEkJTknLSAuZqR1P1EtjhKaMHgJ0FMiy3xgIM+R0o+r3c8w7mUgJ2kOJVV2WRenTN3rojQOUqI3TIHhDqgFWyK5hIZbupb3LNFecb7lwTWMp4dbF2qx+6qbkJm8N0flnj4GKTXSPozo8aiyMmtIXPC6p5HBz+p/77kWf4= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1555335047; 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=k8P6OVmadiTEbJUb7sj0sNAffreKBqv11nEiE/NMIsM=; b=eK4hprdTFivJ4EjQmyFRoN3AaMYeEGnjTEnDbxzxSHM2v+F0jGuPfpLJjDkNB70wgoWSoZchHm18YLjle4+TNxqQK1vAAHchQp6/MsT8iW8n80Dc189BDe0LUTapRT4wRKgvvzaVpSNw8lRijalF/Y67UtE7+PU4QNIZKr5zfuQ= 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 (209.51.188.17 [209.51.188.17]) by mx.zohomail.com with SMTPS id 1555335047078356.897338328862; Mon, 15 Apr 2019 06:30:47 -0700 (PDT) Received: from localhost ([127.0.0.1]:50304 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hG1h3-00075V-3W for importer@patchew.org; Mon, 15 Apr 2019 09:30:41 -0400 Received: from eggs.gnu.org ([209.51.188.92]:42666) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hG1ds-0004jE-Tp for qemu-devel@nongnu.org; Mon, 15 Apr 2019 09:27:25 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hG1dr-00055i-4r for qemu-devel@nongnu.org; Mon, 15 Apr 2019 09:27:24 -0400 Received: from mx1.redhat.com ([209.132.183.28]:58837) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hG1dq-000557-TN; Mon, 15 Apr 2019 09:27:23 -0400 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id A70FFC04D30D; Mon, 15 Apr 2019 13:27:21 +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 105C61001DDD; Mon, 15 Apr 2019 13:27:18 +0000 (UTC) From: Igor Mammedov To: qemu-devel@nongnu.org Date: Mon, 15 Apr 2019 15:27:21 +0200 Message-Id: <1555334842-195718-5-git-send-email-imammedo@redhat.com> In-Reply-To: <1555334842-195718-1-git-send-email-imammedo@redhat.com> References: <1555334842-195718-1-git-send-email-imammedo@redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.31]); Mon, 15 Apr 2019 13:27:21 +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 v1 4/5] memory: make MemoryRegion alias migratable X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-ppc@nongnu.org, David Hildenbrand , Helge Deller , Cornelia Huck , Mark Cave-Ayland , Halil Pasic , Christian Borntraeger , qemu-s390x@nongnu.org, =?UTF-8?q?Herv=C3=A9=20Poussineau?= , Paolo Bonzini , Richard Henderson , Artyom Tarasenko , David Gibson 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 6ab62f4..0fc10d1 100644 --- a/exec.c +++ b/exec.c @@ -2255,7 +2255,7 @@ 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 */ @@ -2613,7 +2613,8 @@ 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 @@ -2622,7 +2623,7 @@ 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 9fbca52..687a147 100644 --- a/memory.c +++ b/memory.c @@ -1672,6 +1672,11 @@ 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 2.7.4