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virtio-iommu: Revert transient enablement of IOMMU MR in bypass mode 

In 94df5b2180 ("virtio-iommu: Fix 64kB host page size VFIO device
assignment"), in case of bypass mode, we transiently enabled the
IOMMU MR to allow the set_page_size_mask() to be called and pass
information about the page size mask constraint of cold plugged
VFIO devices. Now we do not use the IOMMU MR callback anymore, we
can just get rid of this hack.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Eric Auger 2024-07-01 10:48:59 +02:00 committed by Cédric Le Goater
parent 2457343d05
commit 956b30b9cf
1 changed files with 0 additions and 12 deletions
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12
hw/virtio/virtio-iommu.c
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@ -1430,18 +1430,6 @@ static void virtio_iommu_freeze_granule(Notifier *notifier, void *data)
VirtIOIOMMU *s = container_of(notifier, VirtIOIOMMU, machine_done);
int granule;
if (likely(s->config.bypass)) {
/*
* Transient IOMMU MR enable to collect page_size_mask requirements
* through memory_region_iommu_set_page_size_mask() called by
* VFIO region_add() callback
*/
s->config.bypass = false;
virtio_iommu_switch_address_space_all(s);
/* restore default */
s->config.bypass = true;
virtio_iommu_switch_address_space_all(s);
}
s->granule_frozen = true;
granule = ctz64(s->config.page_size_mask);
trace_virtio_iommu_freeze_granule(BIT_ULL(granule));