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memory: Add IOMMUTLBEvent

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This way we can tell between regular IOMMUTLBEntry (entry of IOMMU
hardware) and notifications.

In the notifications, we set explicitly if it is a MAPs or an UNMAP,
instead of trusting in entry permissions to differentiate them.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20201116165506.31315-3-eperezma@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Eugenio Pérez 2020-11-16 17:55:03 +01:00 • committed by Michael S. Tsirkin
parent 3b5ebf8532
commit 5039caf3c4
9 changed files with 143 additions and 122 deletions
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27
include/exec/memory.h
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@ -116,6 +116,11 @@ struct IOMMUNotifier {
};
typedef struct IOMMUNotifier IOMMUNotifier;
typedef struct IOMMUTLBEvent {
IOMMUNotifierFlag type;
IOMMUTLBEntry entry;
} IOMMUTLBEvent;
/* RAM is pre-allocated and passed into qemu_ram_alloc_from_ptr */
#define RAM_PREALLOC (1 << 0)
@ -1326,24 +1331,18 @@ uint64_t memory_region_iommu_get_min_page_size(IOMMUMemoryRegion *iommu_mr);
/**
* memory_region_notify_iommu: notify a change in an IOMMU translation entry.
*
* The notification type will be decided by entry.perm bits:
*
* - For UNMAP (cache invalidation) notifies: set entry.perm to IOMMU_NONE.
* - For MAP (newly added entry) notifies: set entry.perm to the
* permission of the page (which is definitely !IOMMU_NONE).
*
* Note: for any IOMMU implementation, an in-place mapping change
* should be notified with an UNMAP followed by a MAP.
*
* @iommu_mr: the memory region that was changed
* @iommu_idx: the IOMMU index for the translation table which has changed
* @entry: the new entry in the IOMMU translation table. The entry
* replaces all old entries for the same virtual I/O address range.
* Deleted entries have .@perm == 0.
* @event: TLB event with the new entry in the IOMMU translation table.
* The entry replaces all old entries for the same virtual I/O address
* range.
*/
void memory_region_notify_iommu(IOMMUMemoryRegion *iommu_mr,
int iommu_idx,
IOMMUTLBEntry entry);
IOMMUTLBEvent event);
/**
* memory_region_notify_iommu_one: notify a change in an IOMMU translation
@ -1353,12 +1352,12 @@ void memory_region_notify_iommu(IOMMUMemoryRegion *iommu_mr,
* notifies a specific notifier, not all of them.
*
* @notifier: the notifier to be notified
* @entry: the new entry in the IOMMU translation table. The entry
* replaces all old entries for the same virtual I/O address range.
* Deleted entries have .@perm == 0.
* @event: TLB event with the new entry in the IOMMU translation table.
* The entry replaces all old entries for the same virtual I/O address
* range.
*/
void memory_region_notify_iommu_one(IOMMUNotifier *notifier,
IOMMUTLBEntry *entry);
IOMMUTLBEvent *event);
/**
* memory_region_register_iommu_notifier: register a notifier for changes to