On Mon, Sep 18, 2023 at 01:51:44PM +0200, Niklas Schnelle wrote: > Add ops->flush_iotlb_all operation to enable virtio-iommu for the > dma-iommu deferred flush scheme. This results in a significant increase > in performance in exchange for a window in which devices can still > access previously IOMMU mapped memory when running with > CONFIG_IOMMU_DEFAULT_DMA_LAZY. The previous strict behavior can be > achieved with iommu.strict=1 on the kernel command line or > CONFIG_IOMMU_DEFAULT_DMA_STRICT. > > Link: https://lore.kernel.org/lkml/20230802123612.GA6142@myrica/ > Signed-off-by: Niklas Schnelle <schnelle@xxxxxxxxxxxxx> Reviewed-by: Jean-Philippe Brucker <jean-philippe@xxxxxxxxxx> > --- > drivers/iommu/virtio-iommu.c | 10 ++++++++++ > 1 file changed, 10 insertions(+) > > diff --git a/drivers/iommu/virtio-iommu.c b/drivers/iommu/virtio-iommu.c > index 3649586f0e5c..4dd330fbcbdd 100644 > --- a/drivers/iommu/virtio-iommu.c > +++ b/drivers/iommu/virtio-iommu.c > @@ -926,6 +926,13 @@ static int viommu_iotlb_sync_map(struct iommu_domain *domain, > return viommu_sync_req(vdomain->viommu); > } > > +static void viommu_flush_iotlb_all(struct iommu_domain *domain) > +{ > + struct viommu_domain *vdomain = to_viommu_domain(domain); > + > + viommu_sync_req(vdomain->viommu); > +} > + > static void viommu_get_resv_regions(struct device *dev, struct list_head *head) > { > struct iommu_resv_region *entry, *new_entry, *msi = NULL; > @@ -1051,6 +1058,8 @@ static bool viommu_capable(struct device *dev, enum iommu_cap cap) > switch (cap) { > case IOMMU_CAP_CACHE_COHERENCY: > return true; > + case IOMMU_CAP_DEFERRED_FLUSH: > + return true; > default: > return false; > } > @@ -1071,6 +1080,7 @@ static struct iommu_ops viommu_ops = { > .map_pages = viommu_map_pages, > .unmap_pages = viommu_unmap_pages, > .iova_to_phys = viommu_iova_to_phys, > + .flush_iotlb_all = viommu_flush_iotlb_all, > .iotlb_sync = viommu_iotlb_sync, > .iotlb_sync_map = viommu_iotlb_sync_map, > .free = viommu_domain_free, > > -- > 2.39.2 > _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
