From patchwork Tue Aug 30 03:06:53 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jason Wang X-Patchwork-Id: 663982 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3sNYW71GH8z9s5l for ; Tue, 30 Aug 2016 13:13:23 +1000 (AEST) Received: from localhost ([::1]:46699 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1beZUG-0006ys-QJ for incoming@patchwork.ozlabs.org; Mon, 29 Aug 2016 23:13:20 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:39448) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1beZOd-0001KP-5S for qemu-devel@nongnu.org; Mon, 29 Aug 2016 23:07:36 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1beZOa-00068y-Kv for qemu-devel@nongnu.org; Mon, 29 Aug 2016 23:07:29 -0400 Received: from mx1.redhat.com ([209.132.183.28]:51544) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1beZOa-00068u-DP for qemu-devel@nongnu.org; Mon, 29 Aug 2016 23:07:28 -0400 Received: from int-mx09.intmail.prod.int.phx2.redhat.com (int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 169C161E46; Tue, 30 Aug 2016 03:07:28 +0000 (UTC) Received: from jason-ThinkPad-T450s.redhat.com (vpn1-6-61.pek2.redhat.com [10.72.6.61]) by int-mx09.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u7U370dm027913; Mon, 29 Aug 2016 23:07:23 -0400 From: Jason Wang To: mst@redhat.com, qemu-devel@nongnu.org Date: Tue, 30 Aug 2016 11:06:53 +0800 Message-Id: <1472526419-5900-6-git-send-email-jasowang@redhat.com> In-Reply-To: <1472526419-5900-1-git-send-email-jasowang@redhat.com> References: <1472526419-5900-1-git-send-email-jasowang@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.39]); Tue, 30 Aug 2016 03:07:28 +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 for 2.8 05/11] exec: introduce address_space_get_iotlb_entry() 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: Peter Crosthwaite , Jason Wang , peterx@redhat.com, vkaplans@redhat.com, wexu@redhat.com, cornelia.huck@de.ibm.com, pbonzini@redhat.com, Richard Henderson Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" 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 | 33 +++++++++++++++++++++++++++++++++ include/exec/memory.h | 6 ++++++ 2 files changed, 39 insertions(+) diff --git a/exec.c b/exec.c index 8ffde75..a1a8489 100644 --- a/exec.c +++ b/exec.c @@ -417,6 +417,39 @@ 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); + addr = ((iotlb.translated_addr & ~iotlb.addr_mask) + | (addr & iotlb.addr_mask)); + plen = MIN(plen, (addr | iotlb.addr_mask) - addr + 1); + 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 3e4d416..8e4513d 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -1355,6 +1355,12 @@ void address_space_stq_le(AddressSpace *as, hwaddr addr, uint64_t val, void address_space_stq_be(AddressSpace *as, hwaddr addr, uint64_t val, MemTxAttrs attrs, MemTxResult *result); +/* 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