[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PULL 07/41] exec: introduce address_space_get_iotlb_entry(
From: |
Michael S. Tsirkin |
Subject: |
[Qemu-devel] [PULL 07/41] exec: introduce address_space_get_iotlb_entry() |
Date: |
Tue, 10 Jan 2017 07:39:38 +0200 |
From: Jason Wang <address@hidden>
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>
Reviewed-by: Michael S. Tsirkin <address@hidden>
Signed-off-by: Michael S. Tsirkin <address@hidden>
---
include/exec/memory.h | 5 +++++
exec.c | 33 +++++++++++++++++++++++++++++++++
2 files changed, 38 insertions(+)
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
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)
--
MST
- [Qemu-devel] [PULL 00/41] virtio, vhost, pc: fixes, features, Michael S. Tsirkin, 2017/01/10
- [Qemu-devel] [PULL 01/41] migration: allow to prioritize save state entries, Michael S. Tsirkin, 2017/01/10
- [Qemu-devel] [PULL 02/41] intel_iommu: allow migration, Michael S. Tsirkin, 2017/01/10
- [Qemu-devel] [PULL 03/41] virtio-crypto: fix possible integer and heap overflow, Michael S. Tsirkin, 2017/01/10
- [Qemu-devel] [PULL 05/41] intel_iommu: name vtd address space with devfn, Michael S. Tsirkin, 2017/01/10
- [Qemu-devel] [PULL 06/41] intel_iommu: allocate new key when creating new address space, Michael S. Tsirkin, 2017/01/10
- [Qemu-devel] [PULL 04/41] virtio: convert to use DMA api, Michael S. Tsirkin, 2017/01/10
- [Qemu-devel] [PULL 07/41] exec: introduce address_space_get_iotlb_entry(),
Michael S. Tsirkin <=
- [Qemu-devel] [PULL 08/41] intel_iommu: support device iotlb descriptor, Michael S. Tsirkin, 2017/01/10
[Qemu-devel] [PULL 09/41] virtio-pci: address space translation service (ATS) support, Michael S. Tsirkin, 2017/01/10
[Qemu-devel] [PULL 10/41] acpi: add ATSR for q35, Michael S. Tsirkin, 2017/01/10
[Qemu-devel] [PULL 11/41] memory: handle alias for iommu notifier, Michael S. Tsirkin, 2017/01/10