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| author | Paul Mackerras <paulus@ozlabs.org> | 2018-07-26 15:38:41 +1000 |
|---|---|---|
| committer | Paul Mackerras <paulus@ozlabs.org> | 2018-07-26 15:38:41 +1000 |
| commit | b5c6f7607b908b1445f2556c8d2f3b1ec5fc5aa8 (patch) | |
| tree | 8f2b60ec1b6dc6462210929f2ede6f3a25f9de63 /drivers/char/powernv-op-panel.c | |
| parent | 1ebe6b81ebdba8faf377d1d7d84ad9368e7a0bae (diff) | |
| download | linux-b5c6f7607b908b1445f2556c8d2f3b1ec5fc5aa8.tar.gz | |
KVM: PPC: Book3S HV: Read kvm->arch.emul_smt_mode under kvm->lock
Commit 1e175d2 ("KVM: PPC: Book3S HV: Pack VCORE IDs to access full
VCPU ID space", 2018-07-25) added code that uses kvm->arch.emul_smt_mode
before any VCPUs are created. However, userspace can change
kvm->arch.emul_smt_mode at any time up until the first VCPU is created.
Hence it is (theoretically) possible for the check in
kvmppc_core_vcpu_create_hv() to race with another userspace thread
changing kvm->arch.emul_smt_mode.
This fixes it by moving the test that uses kvm->arch.emul_smt_mode into
the block where kvm->lock is held.
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Diffstat (limited to 'drivers/char/powernv-op-panel.c')
0 files changed, 0 insertions, 0 deletions