From patchwork Fri Mar 25 02:13:25 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jason Wang X-Patchwork-Id: 601889 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3qWRh85tm5z9sC3 for ; Fri, 25 Mar 2016 13:14:32 +1100 (AEDT) Received: from localhost ([::1]:53712 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ajHGg-0006Mq-SO for incoming@patchwork.ozlabs.org; Thu, 24 Mar 2016 22:14:30 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:50445) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ajHFz-0005Fp-6B for qemu-devel@nongnu.org; Thu, 24 Mar 2016 22:13:48 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ajHFx-0008Cm-Kh for qemu-devel@nongnu.org; Thu, 24 Mar 2016 22:13:47 -0400 Received: from mx1.redhat.com ([209.132.183.28]:58666) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ajHFx-0008Ce-AO for qemu-devel@nongnu.org; Thu, 24 Mar 2016 22:13:45 -0400 Received: from int-mx13.intmail.prod.int.phx2.redhat.com (int-mx13.intmail.prod.int.phx2.redhat.com [10.5.11.26]) by mx1.redhat.com (Postfix) with ESMTPS id F0D9946213; Fri, 25 Mar 2016 02:13:44 +0000 (UTC) Received: from jason-ThinkPad-T430s.redhat.com (vpn1-7-152.pek2.redhat.com [10.72.7.152]) by int-mx13.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u2P2DUX3032064; Thu, 24 Mar 2016 22:13:42 -0400 From: Jason Wang To: mst@redhat.com, qemu-devel@nongnu.org Date: Fri, 25 Mar 2016 10:13:25 +0800 Message-Id: <1458872009-13342-5-git-send-email-jasowang@redhat.com> In-Reply-To: <1458872009-13342-1-git-send-email-jasowang@redhat.com> References: <1458872009-13342-1-git-send-email-jasowang@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.26 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 209.132.183.28 Cc: Peter Crosthwaite , Jason Wang , peterx@redhat.com, cornelia.huck@de.ibm.com, pbonzini@redhat.com, Richard Henderson Subject: [Qemu-devel] [RFC PATCH 4/8] exec: introduce address_space_get_iotlb_entry() X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org This patch introduces a helper to query the iotlb entry for a possible iova. This will be used by later device IOTLB API to enable the capability for a dataplane (e.g vhost) to query the IOTLB. Cc: Paolo Bonzini Cc: Peter Crosthwaite Cc: Richard Henderson Signed-off-by: Jason Wang --- exec.c | 30 ++++++++++++++++++++++++++++++ include/exec/memory.h | 7 +++++++ 2 files changed, 37 insertions(+) diff --git a/exec.c b/exec.c index f398d21..31fac9f 100644 --- a/exec.c +++ b/exec.c @@ -411,6 +411,36 @@ address_space_translate_internal(AddressSpaceDispatch *d, hwaddr addr, hwaddr *x } /* Called from RCU critical section */ +IOMMUTLBEntry address_space_get_iotlb_entry(AddressSpace *as, hwaddr addr, + bool is_write) +{ + IOMMUTLBEntry iotlb = {0}; + MemoryRegionSection *section; + MemoryRegion *mr; + hwaddr plen; + + for (;;) { + AddressSpaceDispatch *d = atomic_rcu_read(&as->dispatch); + section = address_space_translate_internal(d, addr, &addr, &plen, true); + mr = section->mr; + + if (!mr->iommu_ops) { + break; + } + + iotlb = mr->iommu_ops->translate(mr, addr, is_write); + if (!(iotlb.perm & (1 << is_write))) { + iotlb.target_as = NULL; + break; + } + + as = iotlb.target_as; + } + + return iotlb; +} + +/* Called from RCU critical section */ MemoryRegion *address_space_translate(AddressSpace *as, hwaddr addr, hwaddr *xlat, hwaddr *plen, bool is_write) diff --git a/include/exec/memory.h b/include/exec/memory.h index 2de7898..0411a59 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -1310,6 +1310,13 @@ void address_space_stq(AddressSpace *as, hwaddr addr, uint64_t val, MemTxAttrs attrs, MemTxResult *result); #endif + +/* address_space_get_iotlb_entry: translate an address into an IOTLB + * entry. Should be called from an RCU critical section. + */ +IOMMUTLBEntry address_space_get_iotlb_entry(AddressSpace *as, hwaddr addr, + bool is_write); + /* address_space_translate: translate an address range into an address space * into a MemoryRegion and an address range into that section. Should be * called from an RCU critical section, to avoid that the last reference