From: David Gibson <da...@gibson.dropbear.id.au> This patch adds a NotifierList to MemoryRegions which represent IOMMUs allowing other parts of the code to register interest in mappings or unmappings from the IOMMU. All IOMMU implementations will need to call memory_region_notify_iommu() to inform those waiting on the notifier list, whenever an IOMMU mapping is made or removed.
Signed-off-by: David Gibson <da...@gibson.dropbear.id.au> --- include/exec/memory.h | 7 +++++++ memory.c | 18 ++++++++++++++++++ 2 files changed, 25 insertions(+) diff --git a/include/exec/memory.h b/include/exec/memory.h index e5cad03..05b9bb2 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -25,6 +25,7 @@ #include "exec/iorange.h" #include "exec/ioport.h" #include "qemu/int128.h" +#include "qemu/notify.h" #define MAX_PHYS_ADDR_SPACE_BITS 62 #define MAX_PHYS_ADDR (((hwaddr)1 << MAX_PHYS_ADDR_SPACE_BITS) - 1) @@ -172,6 +173,7 @@ struct MemoryRegion { unsigned ioeventfd_nb; MemoryRegionIoeventfd *ioeventfds; struct AddressSpace *iommu_target_as; + NotifierList iommu_notify; }; struct MemoryRegionPortio { @@ -423,6 +425,11 @@ static inline bool memory_region_is_romd(MemoryRegion *mr) */ bool memory_region_is_iommu(MemoryRegion *mr); +void memory_region_notify_iommu(MemoryRegion *mr, + IOMMUTLBEntry entry); +void memory_region_register_iommu_notifier(MemoryRegion *mr, Notifier *n); +void memory_region_unregister_iommu_notifier(Notifier *n); + /** * memory_region_name: get a memory region's name * diff --git a/memory.c b/memory.c index b25d21d..e3970bf 100644 --- a/memory.c +++ b/memory.c @@ -991,6 +991,7 @@ void memory_region_init_iommu(MemoryRegion *mr, mr->terminates = true; /* then re-forwards */ mr->destructor = memory_region_destructor_none; mr->iommu_target_as = target_as; + notifier_list_init(&mr->iommu_notify); } static uint64_t invalid_read(void *opaque, hwaddr addr, @@ -1072,6 +1073,23 @@ bool memory_region_is_iommu(MemoryRegion *mr) return mr->iommu_ops; } +void memory_region_register_iommu_notifier(MemoryRegion *mr, Notifier *n) +{ + notifier_list_add(&mr->iommu_notify, n); +} + +void memory_region_unregister_iommu_notifier(Notifier *n) +{ + notifier_remove(n); +} + +void memory_region_notify_iommu(MemoryRegion *mr, + IOMMUTLBEntry entry) +{ + assert(memory_region_is_iommu(mr)); + notifier_list_notify(&mr->iommu_notify, &entry); +} + void memory_region_set_log(MemoryRegion *mr, bool log, unsigned client) { uint8_t mask = 1 << client; -- 1.8.1.4