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virtio-iommu: Handle non power of 2 range invalidations 

Unmap notifiers work with an address mask assuming an
invalidation range of a power of 2. Nothing mandates this
in the VIRTIO-IOMMU spec.

So in case the range is not a power of 2, split it into
several invalidations.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Message-id: 20210309102742.30442-4-eric.auger@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Eric Auger 2021-03-09 11:27:38 +01:00 committed by Peter Maydell
parent f14fb6c2db
commit dde3f08b5c
1 changed files with 16 additions and 3 deletions
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19
hw/virtio/virtio-iommu.c
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@ -155,6 +155,7 @@ static void virtio_iommu_notify_unmap(IOMMUMemoryRegion *mr, hwaddr virt_start,
hwaddr virt_end)
{
IOMMUTLBEvent event;
uint64_t delta = virt_end - virt_start;
if (!(mr->iommu_notify_flags & IOMMU_NOTIFIER_UNMAP)) {
return;
@ -164,12 +165,24 @@ static void virtio_iommu_notify_unmap(IOMMUMemoryRegion *mr, hwaddr virt_start,
event.type = IOMMU_NOTIFIER_UNMAP;
event.entry.target_as = &address_space_memory;
event.entry.addr_mask = virt_end - virt_start;
event.entry.iova = virt_start;
event.entry.perm = IOMMU_NONE;
event.entry.translated_addr = 0;
event.entry.addr_mask = delta;
event.entry.iova = virt_start;
memory_region_notify_iommu(mr, 0, event);
if (delta == UINT64_MAX) {
memory_region_notify_iommu(mr, 0, event);
}
while (virt_start != virt_end + 1) {
uint64_t mask = dma_aligned_pow2_mask(virt_start, virt_end, 64);
event.entry.addr_mask = mask;
event.entry.iova = virt_start;
memory_region_notify_iommu(mr, 0, event);
virt_start += mask + 1;
}
}
static gboolean virtio_iommu_notify_unmap_cb(gpointer key, gpointer value,