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VFIO updates for v5.5-rc1

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- Remove hugepage checks for reserved pfns (Ben Luo)
 
  - Fix irq-bypass unregister ordering (Jiang Yi)
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Merge tag 'vfio-v5.5-rc1' of git://github.com/awilliam/linux-vfio

Pull VFIO updates from Alex Williamson:

 - Remove hugepage checks for reserved pfns (Ben Luo)

 - Fix irq-bypass unregister ordering (Jiang Yi)

* tag 'vfio-v5.5-rc1' of git://github.com/awilliam/linux-vfio:
  vfio/pci: call irq_bypass_unregister_producer() before freeing irq
  vfio/type1: remove hugepage checks in is_invalid_reserved_pfn()
This commit is contained in:
Linus Torvalds 2019-12-07 14:51:04 -08:00
commit 94e89b4023
2 changed files with 5 additions and 23 deletions
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2
drivers/vfio/pci/vfio_pci_intrs.c
View File

@ -294,8 +294,8 @@ static int vfio_msi_set_vector_signal(struct vfio_pci_device *vdev,
irq = pci_irq_vector(pdev, vector);
if (vdev->ctx[vector].trigger) {
free_irq(irq, vdev->ctx[vector].trigger);
irq_bypass_unregister_producer(&vdev->ctx[vector].producer);
free_irq(irq, vdev->ctx[vector].trigger);
kfree(vdev->ctx[vector].name);
eventfd_ctx_put(vdev->ctx[vector].trigger);
vdev->ctx[vector].trigger = NULL;

26
drivers/vfio/vfio_iommu_type1.c
View File

@ -294,31 +294,13 @@ static int vfio_lock_acct(struct vfio_dma *dma, long npage, bool async)
* Some mappings aren't backed by a struct page, for example an mmap'd
* MMIO range for our own or another device. These use a different
* pfn conversion and shouldn't be tracked as locked pages.
* For compound pages, any driver that sets the reserved bit in head
* page needs to set the reserved bit in all subpages to be safe.
*/
static bool is_invalid_reserved_pfn(unsigned long pfn)
{
if (pfn_valid(pfn)) {
bool reserved;
struct page *tail = pfn_to_page(pfn);
struct page *head = compound_head(tail);
reserved = !!(PageReserved(head));
if (head != tail) {
/*
* "head" is not a dangling pointer
* (compound_head takes care of that)
* but the hugepage may have been split
* from under us (and we may not hold a
* reference count on the head page so it can
* be reused before we run PageReferenced), so
* we've to check PageTail before returning
* what we just read.
*/
smp_rmb();
if (PageTail(tail))
return reserved;
}
return PageReserved(tail);
}
if (pfn_valid(pfn))
return PageReserved(pfn_to_page(pfn));
return true;
}