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author | Andre Przywara <andre.przywara@arm.com> | 2018-05-11 17:20:14 +0300 |
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committer | Paolo Bonzini <pbonzini@redhat.com> | 2018-05-15 14:36:49 +0300 |
commit | bf308242ab98b5d1648c3663e753556bef9bec01 (patch) | |
tree | e01104e8d59a2199b011772e943c32f029a21982 /virt/kvm/arm/aarch32.c | |
parent | 9c4188762f7fee032abf8451fd9865a9abfc5516 (diff) | |
download | linux-bf308242ab98b5d1648c3663e753556bef9bec01.tar.xz |
KVM: arm/arm64: VGIC/ITS: protect kvm_read_guest() calls with SRCU lock
kvm_read_guest() will eventually look up in kvm_memslots(), which requires
either to hold the kvm->slots_lock or to be inside a kvm->srcu critical
section.
In contrast to x86 and s390 we don't take the SRCU lock on every guest
exit, so we have to do it individually for each kvm_read_guest() call.
Provide a wrapper which does that and use that everywhere.
Note that ending the SRCU critical section before returning from the
kvm_read_guest() wrapper is safe, because the data has been *copied*, so
we don't need to rely on valid references to the memslot anymore.
Cc: Stable <stable@vger.kernel.org> # 4.8+
Reported-by: Jan Glauber <jan.glauber@caviumnetworks.com>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Christoffer Dall <christoffer.dall@arm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt/kvm/arm/aarch32.c')
0 files changed, 0 insertions, 0 deletions