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[Qemu-devel] [PATCH V4 04/10] exec: introduce address_space_get_iotlb_en
From: |
Jason Wang |
Subject: |
[Qemu-devel] [PATCH V4 04/10] exec: introduce address_space_get_iotlb_entry() |
Date: |
Fri, 30 Dec 2016 18:09:13 +0800 |
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 <address@hidden>
Cc: Peter Crosthwaite <address@hidden>
Cc: Richard Henderson <address@hidden>
Acked-by: Paolo Bonzini <address@hidden>
Signed-off-by: Jason Wang <address@hidden>
---
exec.c | 33 +++++++++++++++++++++++++++++++++
include/exec/memory.h | 5 +++++
2 files changed, 38 insertions(+)
diff --git a/exec.c b/exec.c
index 8d4bb0e..47835c1 100644
--- a/exec.c
+++ b/exec.c
@@ -449,6 +449,39 @@ 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;
+
+ for (;;) {
+ AddressSpaceDispatch *d = atomic_rcu_read(&as->dispatch);
+ section = address_space_lookup_region(d, addr, false);
+ addr = addr - section->offset_within_address_space
+ + section->offset_within_region;
+ 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;
+ }
+
+ addr = ((iotlb.translated_addr & ~iotlb.addr_mask)
+ | (addr & iotlb.addr_mask));
+ 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 64560f6..358edfb 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -1537,6 +1537,11 @@ void stl_le_phys_cached(MemoryRegionCache *cache, hwaddr
addr, uint32_t val);
void stl_be_phys_cached(MemoryRegionCache *cache, hwaddr addr, uint32_t val);
void stq_le_phys_cached(MemoryRegionCache *cache, hwaddr addr, uint64_t val);
void stq_be_phys_cached(MemoryRegionCache *cache, hwaddr addr, uint64_t val);
+/* 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
--
2.7.4
- [Qemu-devel] [PATCH V4 00/10] vhost device IOTLB support, Jason Wang, 2016/12/30
- [Qemu-devel] [PATCH V4 02/10] intel_iommu: name vtd address space with devfn, Jason Wang, 2016/12/30
- [Qemu-devel] [PATCH V4 01/10] virtio: convert to use DMA api, Jason Wang, 2016/12/30
- [Qemu-devel] [PATCH V4 03/10] intel_iommu: allocate new key when creating new address space, Jason Wang, 2016/12/30
- [Qemu-devel] [PATCH V4 04/10] exec: introduce address_space_get_iotlb_entry(),
Jason Wang <=
- [Qemu-devel] [PATCH V4 05/10] intel_iommu: support device iotlb descriptor, Jason Wang, 2016/12/30
- [Qemu-devel] [PATCH V4 07/10] acpi: add ATSR for q35, Jason Wang, 2016/12/30
- [Qemu-devel] [PATCH V4 06/10] virtio-pci: address space translation service (ATS) support, Jason Wang, 2016/12/30
- [Qemu-devel] [PATCH V4 08/10] memory: handle alias for iommu notifier, Jason Wang, 2016/12/30
- [Qemu-devel] [PATCH V4 09/10] memory: handle alias in memory_region_is_iommu(), Jason Wang, 2016/12/30
- [Qemu-devel] [PATCH V4 10/10] vhost_net: device IOTLB support, Jason Wang, 2016/12/30