From mboxrd@z Thu Jan 1 00:00:00 1970 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 From: Jason Wang 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> Subject: [Qemu-devel] [RFC PATCH 4/8] exec: introduce address_space_get_iotlb_entry() List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: mst@redhat.com, qemu-devel@nongnu.org Cc: Peter Crosthwaite , Jason Wang , peterx@redhat.com, cornelia.huck@de.ibm.com, pbonzini@redhat.com, Richard Henderson 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 -- 2.5.0