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memory: Fix IOMMU replay base address 

Since a788f227 "memory: Allow replay of IOMMU mapping notifications"
when new VFIO listener is added, all existing IOMMU mappings are
replayed. However there is a problem that the base address of
an IOMMU memory region (IOMMU MR) is ignored which is not a problem
for the existing user (which is pseries) with its default 32bit DMA
window starting at 0 but it is if there is another DMA window.

This stores the IOMMU's offset_within_address_space and adjusts
the IOVA before calling vfio_dma_map/vfio_dma_unmap.

As the IOMMU notifier expects IOVA offset rather than the absolute
address, this also adjusts IOVA in sPAPR H_PUT_TCE handler before
calling notifier(s).

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Alexey Kardashevskiy 2016-05-26 09:43:23 -06:00 committed by Alex Williamson
parent 7a057b4fb9
commit d78c19b5cf
3 changed files with 10 additions and 7 deletions
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2
hw/ppc/spapr_iommu.c
View File

@ -278,7 +278,7 @@ static target_ulong put_tce_emu(sPAPRTCETable *tcet, target_ulong ioba,
tcet->table[index] = tce;
entry.target_as = &address_space_memory,
entry.iova = ioba & page_mask;
entry.iova = (ioba - tcet->bus_offset) & page_mask;
entry.translated_addr = tce & page_mask;
entry.addr_mask = ~page_mask;
entry.perm = spapr_tce_iommu_access_flags(tce);

14
hw/vfio/common.c
View File

@ -260,14 +260,14 @@ static void vfio_iommu_map_notify(Notifier *n, void *data)
VFIOGuestIOMMU *giommu = container_of(n, VFIOGuestIOMMU, n);
VFIOContainer *container = giommu->container;
IOMMUTLBEntry *iotlb = data;
hwaddr iova = iotlb->iova + giommu->iommu_offset;
MemoryRegion *mr;
hwaddr xlat;
hwaddr len = iotlb->addr_mask + 1;
void *vaddr;
int ret;
trace_vfio_iommu_map_notify(iotlb->iova,
iotlb->iova + iotlb->addr_mask);
trace_vfio_iommu_map_notify(iova, iova + iotlb->addr_mask);
/*
* The IOMMU TLB entry we have just covers translation through
@ -294,21 +294,21 @@ static void vfio_iommu_map_notify(Notifier *n, void *data)
if ((iotlb->perm & IOMMU_RW) != IOMMU_NONE) {
vaddr = memory_region_get_ram_ptr(mr) + xlat;
ret = vfio_dma_map(container, iotlb->iova,
ret = vfio_dma_map(container, iova,
iotlb->addr_mask + 1, vaddr,
!(iotlb->perm & IOMMU_WO) || mr->readonly);
if (ret) {
error_report("vfio_dma_map(%p, 0x%"HWADDR_PRIx", "
"0x%"HWADDR_PRIx", %p) = %d (%m)",
container, iotlb->iova,
container, iova,
iotlb->addr_mask + 1, vaddr, ret);
}
} else {
ret = vfio_dma_unmap(container, iotlb->iova, iotlb->addr_mask + 1);
ret = vfio_dma_unmap(container, iova, iotlb->addr_mask + 1);
if (ret) {
error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", "
"0x%"HWADDR_PRIx") = %d (%m)",
container, iotlb->iova,
container, iova,
iotlb->addr_mask + 1, ret);
}
}
@ -380,6 +380,8 @@ static void vfio_listener_region_add(MemoryListener *listener,
*/
giommu = g_malloc0(sizeof(*giommu));
giommu->iommu = section->mr;
giommu->iommu_offset = section->offset_within_address_space -
section->offset_within_region;
giommu->container = container;
giommu->n.notify = vfio_iommu_map_notify;
QLIST_INSERT_HEAD(&container->giommu_list, giommu, giommu_next);

1
include/hw/vfio/vfio-common.h
View File

@ -90,6 +90,7 @@ typedef struct VFIOContainer {
typedef struct VFIOGuestIOMMU {
VFIOContainer *container;
MemoryRegion *iommu;
hwaddr iommu_offset;
Notifier n;
QLIST_ENTRY(VFIOGuestIOMMU) giommu_next;
} VFIOGuestIOMMU;