From nobody Sun Feb 8 20:12:49 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; 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 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1499845121956242.16926101096465; Wed, 12 Jul 2017 00:38:41 -0700 (PDT) Received: from localhost ([::1]:50837 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dVCEK-0002Mk-AF for importer@patchew.org; Wed, 12 Jul 2017 03:38:40 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:41660) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dVCCN-0001D4-En for qemu-devel@nongnu.org; Wed, 12 Jul 2017 03:36:40 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dVCCM-0002A6-Bi for qemu-devel@nongnu.org; Wed, 12 Jul 2017 03:36:39 -0400 Received: from mx1.redhat.com ([209.132.183.28]:33668) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dVCCM-00029K-29 for qemu-devel@nongnu.org; Wed, 12 Jul 2017 03:36:38 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 084D980C0F for ; Wed, 12 Jul 2017 07:36:37 +0000 (UTC) Received: from pxdev.xzpeter.org.com (dhcp-14-238.nay.redhat.com [10.66.14.238]) by smtp.corp.redhat.com (Postfix) with ESMTP id 79A6817278; Wed, 12 Jul 2017 07:36:35 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 084D980C0F Authentication-Results: ext-mx02.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx02.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=peterx@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com 084D980C0F From: Peter Xu To: qemu-devel@nongnu.org Date: Wed, 12 Jul 2017 15:36:20 +0800 Message-Id: <1499844982-5738-3-git-send-email-peterx@redhat.com> In-Reply-To: <1499844982-5738-1-git-send-email-peterx@redhat.com> References: <1499844982-5738-1-git-send-email-peterx@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.26]); Wed, 12 Jul 2017 07:36:37 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v2 2/4] intel_iommu: let iotlb size tunable 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: Jason Wang , peterx@redhat.com, "Michael S . Tsirkin" Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" We were having static IOTLB size as 1024. Let it be a tunable. We can also turns IOTLB off if we want, by specify the size as zero. The tunable is named as "x-iotlb-size" since that should not really be something used by user yet, but mostly for debugging purpose now. Signed-off-by: Peter Xu --- hw/i386/intel_iommu.c | 11 ++++++++++- hw/i386/intel_iommu_internal.h | 1 - include/hw/i386/intel_iommu.h | 1 + 3 files changed, 11 insertions(+), 2 deletions(-) diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c index 392da45..9c36866 100644 --- a/hw/i386/intel_iommu.c +++ b/hw/i386/intel_iommu.c @@ -222,6 +222,10 @@ static VTDIOTLBEntry *vtd_lookup_iotlb(IntelIOMMUState= *s, uint16_t source_id, uint64_t key; int level; =20 + if (s->iotlb_size =3D=3D 0) { + return NULL; + } + for (level =3D VTD_SL_PT_LEVEL; level < VTD_SL_PML4_LEVEL; level++) { key =3D vtd_get_iotlb_key(vtd_get_iotlb_gfn(addr, level), source_id, level); @@ -244,8 +248,12 @@ static void vtd_update_iotlb(IntelIOMMUState *s, uint1= 6_t source_id, uint64_t *key =3D g_malloc(sizeof(*key)); uint64_t gfn =3D vtd_get_iotlb_gfn(addr, level); =20 + if (s->iotlb_size =3D=3D 0) { + return; + } + trace_vtd_iotlb_page_update(source_id, addr, slpte, domain_id); - if (g_hash_table_size(s->iotlb) >=3D VTD_IOTLB_MAX_SIZE) { + if (g_hash_table_size(s->iotlb) >=3D s->iotlb_size) { trace_vtd_iotlb_reset("iotlb exceeds size limit"); vtd_reset_iotlb(s); } @@ -2397,6 +2405,7 @@ static Property vtd_properties[] =3D { ON_OFF_AUTO_AUTO), DEFINE_PROP_BOOL("x-buggy-eim", IntelIOMMUState, buggy_eim, false), DEFINE_PROP_BOOL("caching-mode", IntelIOMMUState, caching_mode, FALSE), + DEFINE_PROP_UINT16("x-iotlb-size", IntelIOMMUState, iotlb_size, 1024), DEFINE_PROP_END_OF_LIST(), }; =20 diff --git a/hw/i386/intel_iommu_internal.h b/hw/i386/intel_iommu_internal.h index d1d6290..dc0257c 100644 --- a/hw/i386/intel_iommu_internal.h +++ b/hw/i386/intel_iommu_internal.h @@ -116,7 +116,6 @@ /* The shift of source_id in the key of IOTLB hash table */ #define VTD_IOTLB_SID_SHIFT 36 #define VTD_IOTLB_LVL_SHIFT 52 -#define VTD_IOTLB_MAX_SIZE 1024 /* Max size of the hash table = */ =20 /* IOTLB_REG */ #define VTD_TLB_GLOBAL_FLUSH (1ULL << 60) /* Global invalidation */ diff --git a/include/hw/i386/intel_iommu.h b/include/hw/i386/intel_iommu.h index 3e51876..a57f419 100644 --- a/include/hw/i386/intel_iommu.h +++ b/include/hw/i386/intel_iommu.h @@ -288,6 +288,7 @@ struct IntelIOMMUState { =20 uint32_t context_cache_gen; /* Should be in [1,MAX] */ GHashTable *iotlb; /* IOTLB */ + uint16_t iotlb_size; /* IOTLB max cache entries */ =20 MemoryRegionIOMMUOps iommu_ops; GHashTable *vtd_as_by_busptr; /* VTDBus objects indexed by PCIBus* r= eference */ --=20 2.7.4