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[RFC v7 09/25] hw/pci: introduce pci_device_set/unset_iommu_context()
From: |
Liu Yi L |
Subject: |
[RFC v7 09/25] hw/pci: introduce pci_device_set/unset_iommu_context() |
Date: |
Sat, 4 Jul 2020 04:36:33 -0700 |
For nesting IOMMU translation capable platforms, vIOMMUs running on
such system could be implemented upon physical IOMMU nested paging
(VFIO case). vIOMMU advertises such implementation by "want_nested"
attribute to PCIe devices (e.g. VFIO PCI). Once "want_nested" is
satisfied, device (VFIO case) should set HostIOMMUContext to vIOMMU,
thus vIOMMU could manage stage-1 translation. DMAs out from such
devices would be protected through the stage-1 page tables owned by
guest together with stage-2 page tables owned by host.
This patch adds pci_device_set/unset_iommu_context() to set/unset
HostIOMMUContext for a given PCIe device (VFIO case). Caller of set
should fail if set operation failed.
Cc: Kevin Tian <kevin.tian@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Eric Auger <eric.auger@redhat.com>
Cc: Yi Sun <yi.y.sun@linux.intel.com>
Cc: David Gibson <david@gibson.dropbear.id.au>
Cc: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Liu Yi L <yi.l.liu@intel.com>
---
rfcv5 (v2) -> rfcv6:
*) pci_device_set_iommu_context() returns 0 if callback is not implemented.
---
hw/pci/pci.c | 28 ++++++++++++++++++++++++++++
include/hw/pci/pci.h | 10 ++++++++++
2 files changed, 38 insertions(+)
diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index 3c27805..59864c6 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -2743,6 +2743,34 @@ int pci_device_get_iommu_attr(PCIDevice *dev, IOMMUAttr
attr, void *data)
return -ENOENT;
}
+int pci_device_set_iommu_context(PCIDevice *dev,
+ HostIOMMUContext *iommu_ctx)
+{
+ PCIBus *bus;
+ uint8_t devfn;
+
+ pci_device_get_iommu_bus_devfn(dev, &bus, &devfn);
+ if (bus && bus->iommu_ops &&
+ bus->iommu_ops->set_iommu_context) {
+ return bus->iommu_ops->set_iommu_context(bus,
+ bus->iommu_opaque, devfn, iommu_ctx);
+ }
+ return 0;
+}
+
+void pci_device_unset_iommu_context(PCIDevice *dev)
+{
+ PCIBus *bus;
+ uint8_t devfn;
+
+ pci_device_get_iommu_bus_devfn(dev, &bus, &devfn);
+ if (bus && bus->iommu_ops &&
+ bus->iommu_ops->unset_iommu_context) {
+ bus->iommu_ops->unset_iommu_context(bus,
+ bus->iommu_opaque, devfn);
+ }
+}
+
void pci_setup_iommu(PCIBus *bus, const PCIIOMMUOps *ops, void *opaque)
{
bus->iommu_ops = ops;
diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
index f74161b..0647d64 100644
--- a/include/hw/pci/pci.h
+++ b/include/hw/pci/pci.h
@@ -9,6 +9,8 @@
#include "hw/pci/pcie.h"
+#include "hw/iommu/host_iommu_context.h"
+
extern bool pci_available;
/* PCI bus */
@@ -495,10 +497,18 @@ struct PCIIOMMUOps {
void *opaque, int32_t devfn);
int (*get_iommu_attr)(PCIBus *bus, void *opaque, int32_t devfn,
IOMMUAttr attr, void *data);
+ int (*set_iommu_context)(PCIBus *bus, void *opaque,
+ int32_t devfn,
+ HostIOMMUContext *iommu_ctx);
+ void (*unset_iommu_context)(PCIBus *bus, void *opaque,
+ int32_t devfn);
};
AddressSpace *pci_device_iommu_address_space(PCIDevice *dev);
int pci_device_get_iommu_attr(PCIDevice *dev, IOMMUAttr attr, void *data);
+int pci_device_set_iommu_context(PCIDevice *dev,
+ HostIOMMUContext *iommu_ctx);
+void pci_device_unset_iommu_context(PCIDevice *dev);
void pci_setup_iommu(PCIBus *bus, const PCIIOMMUOps *iommu_ops, void *opaque);
static inline void
--
2.7.4
- [RFC v7 00/25] intel_iommu: expose Shared Virtual Addressing to VMs, Liu Yi L, 2020/07/04
- [RFC v7 01/25] scripts/update-linux-headers: Import iommu.h, Liu Yi L, 2020/07/04
- [RFC v7 04/25] hw/pci: introduce pci_device_get_iommu_attr(), Liu Yi L, 2020/07/04
- [RFC v7 02/25] header file update VFIO/IOMMU vSVA APIs kernel 5.8-rc3, Liu Yi L, 2020/07/04
- [RFC v7 03/25] hw/pci: modify pci_setup_iommu() to set PCIIOMMUOps, Liu Yi L, 2020/07/04
- [RFC v7 05/25] intel_iommu: add get_iommu_attr() callback, Liu Yi L, 2020/07/04
- [RFC v7 06/25] vfio: pass nesting requirement into vfio_get_group(), Liu Yi L, 2020/07/04
- [RFC v7 08/25] hw/iommu: introduce HostIOMMUContext, Liu Yi L, 2020/07/04
- [RFC v7 09/25] hw/pci: introduce pci_device_set/unset_iommu_context(),
Liu Yi L <=
- [RFC v7 07/25] vfio: check VFIO_TYPE1_NESTING_IOMMU support, Liu Yi L, 2020/07/04
- [RFC v7 10/25] intel_iommu: add set/unset_iommu_context callback, Liu Yi L, 2020/07/04
- [RFC v7 11/25] vfio/common: provide PASID alloc/free hooks, Liu Yi L, 2020/07/04
- [RFC v7 12/25] vfio: init HostIOMMUContext per-container, Liu Yi L, 2020/07/04
- [RFC v7 13/25] intel_iommu: add virtual command capability support, Liu Yi L, 2020/07/04
- [RFC v7 14/25] intel_iommu: process PASID cache invalidation, Liu Yi L, 2020/07/04
- [RFC v7 15/25] intel_iommu: add PASID cache management infrastructure, Liu Yi L, 2020/07/04
- [RFC v7 16/25] vfio: add bind stage-1 page table support, Liu Yi L, 2020/07/04
- [RFC v7 17/25] intel_iommu: sync IOMMU nesting cap info for assigned devices, Liu Yi L, 2020/07/04
- [RFC v7 18/25] intel_iommu: bind/unbind guest page table to host, Liu Yi L, 2020/07/04