From: Josh Cartwright Date: Thu, 11 Feb 2016 11:54:01 -0600 Subject: [PATCH 211/342] KVM: arm/arm64: downgrade preempt_disable()d region to migrate_disable() Origin: https://git.kernel.org/cgit/linux/kernel/git/rt/linux-stable-rt.git/commit?id=3da26421c3fe48964d225679c51bda781c92b5e2 kvm_arch_vcpu_ioctl_run() disables the use of preemption when updating the vgic and timer states to prevent the calling task from migrating to another CPU. It does so to prevent the task from writing to the incorrect per-CPU GIC distributor registers. On -rt kernels, it's possible to maintain the same guarantee with the use of migrate_{disable,enable}(), with the added benefit that the migrate-disabled region is preemptible. Update kvm_arch_vcpu_ioctl_run() to do so. Cc: Christoffer Dall Reported-by: Manish Jaggi Signed-off-by: Josh Cartwright Signed-off-by: Sebastian Andrzej Siewior --- virt/kvm/arm/arm.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c index b943ec5345cb..ddc6db1e8cd2 100644 --- a/virt/kvm/arm/arm.c +++ b/virt/kvm/arm/arm.c @@ -725,7 +725,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) * involves poking the GIC, which must be done in a * non-preemptible context. */ - preempt_disable(); + migrate_disable(); kvm_pmu_flush_hwstate(vcpu); @@ -774,7 +774,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) kvm_timer_sync_hwstate(vcpu); kvm_vgic_sync_hwstate(vcpu); local_irq_enable(); - preempt_enable(); + migrate_enable(); continue; } @@ -852,7 +852,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) /* Exit types that need handling before we can be preempted */ handle_exit_early(vcpu, run, ret); - preempt_enable(); + migrate_enable(); ret = handle_exit(vcpu, run, ret); }