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| author | Paolo Bonzini <pbonzini@redhat.com> | 2021-11-30 11:46:07 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-12-08 11:04:43 +0300 |
| commit | f1a1693ea4e2646280a618e52e8ae33f44e64744 (patch) | |
| tree | b68bb0794aaa451003ff583f9f37e5cc8773567b /virt | |
| parent | 245241821ecf73a80e398f835d5510a9a80f6d31 (diff) | |
| download | linux-f1a1693ea4e2646280a618e52e8ae33f44e64744.tar.xz | |
KVM: fix avic_set_running for preemptable kernels
commit 7cfc5c653b07782e7059527df8dc1e3143a7591e upstream.
avic_set_running() passes the current CPU to avic_vcpu_load(), albeit
via vcpu->cpu rather than smp_processor_id(). If the thread is migrated
while avic_set_running runs, the call to avic_vcpu_load() can use a stale
value for the processor id. Avoid this by blocking preemption over the
entire execution of avic_set_running().
Reported-by: Sean Christopherson <seanjc@google.com>
Fixes: 8221c1370056 ("svm: Manage vcpu load/unload when enable AVIC")
Cc: stable@vger.kernel.org
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'virt')
0 files changed, 0 insertions, 0 deletions