Searched hist:"9 a4bb8391fda2312803d44664575a662b9be7189" (Results 1 – 1 of 1) sorted by relevance
| /openbmc/qemu/hw/i386/ |
| H A D | intel_iommu.c | diff 9a4bb8391fda2312803d44664575a662b9be7189 Mon Jun 24 04:18:11 CDT 2019 Peter Xu <peterx@redhat.com> intel_iommu: Fix unexpected unmaps during global unmap
This is an replacement work of Yan Zhao's patch:
https://www.mail-archive.com/qemu-devel@nongnu.org/msg625340.html
vtd_address_space_unmap() will do proper page mask alignment to make
sure each IOTLB message will have correct masks for notification
messages (2^N-1), but sometimes it can be expanded to even supercede
the registered range. That could lead to unexpected UNMAP of already
mapped regions in some other notifiers.
Instead of doing mindless expension of the start address and address
mask, we split the range into smaller ones and guarantee that each
small range will have correct masks (2^N-1) and at the same time we
should also try our best to generate as less IOTLB messages as
possible.
Reported-by: Yan Zhao <yan.y.zhao@intel.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Tested-by: Yan Zhao <yan.y.zhao@intel.com>
Message-Id: <20190624091811.30412-3-peterx@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
|