On Wed, 18 Aug 2021 20:21:29 +0000, Oliver Upton wrote:
> The CPU_ON PSCI call requires careful coordination between vCPUs in KVM,
> as it allows callers to send a payload (pc, context id) to another vCPU
> to start execution. There are a couple of races in the handling of
> CPU_ON:
>
> - KVM uses the kvm->lock to serialize the write-side of a vCPU's reset
> state. However, kvm_vcpu_reset() doesn't take the lock on the
> read-size, meaning the vCPU could be reset with interleaved state
> from two separate CPU_ON calls.
>
> [...]
Applied to next, thanks!
[1/4] KVM: arm64: Fix read-side race on updates to vcpu reset state
commit: 6654f9dfcb88fea3b9affc180dc3c04333d0f306
[2/4] KVM: arm64: Handle PSCI resets before userspace touches vCPU state
commit: 6826c6849b46aaa91300201213701eb861af4ba0
[3/4] KVM: arm64: Enforce reserved bits for PSCI target affinities
commit: e10ecb4d6c0761ca545b3946df1707a41f9f845e
[4/4] selftests: KVM: Introduce psci_cpu_on_test
commit: cb97cf95c44021278b7637731bc0928026bc29ab
Cheers,
M.
--
Without deviation from the norm, progress is not possible.
