From: Reiji Watanabe Date: Wed, 19 Apr 2023 02:18:52 +0000 (-0700) Subject: KVM: arm64: Have kvm_psci_vcpu_on() use WRITE_ONCE() to update mp_state X-Git-Tag: v6.4-rc1~60^2~7^2~5^2 X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=a189884bdc9238aeba941c50f02e25eb584fafed;p=linux-block.git KVM: arm64: Have kvm_psci_vcpu_on() use WRITE_ONCE() to update mp_state All accessors of kvm_vcpu_arch::mp_state should be {READ,WRITE}_ONCE(), since readers of the mp_state don't acquire the mp_state_lock. Nonetheless, kvm_psci_vcpu_on() updates the mp_state without using WRITE_ONCE(). So, fix the code to update the mp_state using WRITE_ONCE. Signed-off-by: Reiji Watanabe Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20230419021852.2981107-3-reijiw@google.com --- diff --git a/arch/arm64/kvm/psci.c b/arch/arm64/kvm/psci.c index 5767e6baa61a..d046e82e3723 100644 --- a/arch/arm64/kvm/psci.c +++ b/arch/arm64/kvm/psci.c @@ -110,7 +110,7 @@ static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu) */ smp_wmb(); - vcpu->arch.mp_state.mp_state = KVM_MP_STATE_RUNNABLE; + WRITE_ONCE(vcpu->arch.mp_state.mp_state, KVM_MP_STATE_RUNNABLE); kvm_vcpu_wake_up(vcpu); out_unlock: