From dcfc08f2fd2de1d5511f3d81b854f34fc8f95319 Mon Sep 17 00:00:00 2001 From: Josh Cartwright Date: Thu, 11 Feb 2016 11:54:01 -0600 Subject: [PATCH 270/323] KVM: arm/arm64: downgrade preempt_disable()d region to migrate_disable() Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patches-5.10.215-rt107.tar.xz 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 --- arch/arm64/kvm/arm.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 4d63fcd7574b2..06fced951e754 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -708,7 +708,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu) * involves poking the GIC, which must be done in a * non-preemptible context. */ - preempt_disable(); + migrate_disable(); kvm_pmu_flush_hwstate(vcpu); @@ -757,7 +757,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu) kvm_timer_sync_user(vcpu); kvm_vgic_sync_hwstate(vcpu); local_irq_enable(); - preempt_enable(); + migrate_enable(); continue; } @@ -829,7 +829,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu) /* Exit types that need handling before we can be preempted */ handle_exit_early(vcpu, ret); - preempt_enable(); + migrate_enable(); /* * The ARMv8 architecture doesn't give the hypervisor -- 2.44.0