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The adapter interrupt page containing the indicator bits is currently pinned. That means that a guest with many devices can pin a lot of memory pages in the host. This also complicates the reference tracking which is needed for memory management handling of protected virtual machines. It might also have some strange side effects for madvise MADV_DONTNEED and other things. We can simply try to get the userspace page set the bits and free the page. By storing the userspace address in the irq routing entry instead of the guest address we can actually avoid many lookups and list walks so that this variant is very likely not slower. If userspace messes around with the memory slots the worst thing that can happen is that we write to some other memory within that process. As we get the the page with FOLL_WRITE this can also not be used to write to shared read-only pages. Signed-off-by: Ulrich Weigand <Ulrich.Weigand@de.ibm.com> Acked-by: David Hildenbrand <david@redhat.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> [borntraeger@de.ibm.com: patch simplification] Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> |
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| .. | ||
| arm | ||
| devices | ||
| amd-memory-encryption.rst | ||
| api.rst | ||
| cpuid.rst | ||
| halt-polling.rst | ||
| hypercalls.rst | ||
| index.rst | ||
| locking.rst | ||
| mmu.rst | ||
| msr.rst | ||
| nested-vmx.rst | ||
| ppc-pv.rst | ||
| review-checklist.rst | ||
| s390-diag.rst | ||
| timekeeping.rst | ||
| vcpu-requests.rst | ||