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| author | Andrew Jones <drjones@redhat.com> | 2017-04-18 18:59:58 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-05-20 15:27:00 +0300 |
| commit | cbaeca8251bbe77c646954c7655b661f0fef8170 (patch) | |
| tree | 0e4ec183209b45fa4c982f755d05d73556b8f3fa /block | |
| parent | 7b268351860c8f9faee86335659118920d7b853b (diff) | |
| download | linux-cbaeca8251bbe77c646954c7655b661f0fef8170.tar.xz | |
KVM: arm/arm64: fix races in kvm_psci_vcpu_on
commit 6c7a5dce22b3f3cc44be098e2837fa6797edb8b8 upstream.
Fix potential races in kvm_psci_vcpu_on() by taking the kvm->lock
mutex. In general, it's a bad idea to allow more than one PSCI_CPU_ON
to process the same target VCPU at the same time. One such problem
that may arise is that one PSCI_CPU_ON could be resetting the target
vcpu, which fills the entire sys_regs array with a temporary value
including the MPIDR register, while another looks up the VCPU based
on the MPIDR value, resulting in no target VCPU found. Resolves both
races found with the kvm-unit-tests/arm/psci unit test.
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Reviewed-by: Christoffer Dall <cdall@linaro.org>
Reported-by: Levente Kurusa <lkurusa@redhat.com>
Suggested-by: Christoffer Dall <cdall@linaro.org>
Signed-off-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Christoffer Dall <cdall@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'block')
0 files changed, 0 insertions, 0 deletions