Merge tag 'kvmarm-6.5' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm...

[platform/kernel/linux-starfive.git] / arch / arm64 / kvm / hyp / vhe / switch.c

diff --git a/arch/arm64/kvm/hyp/vhe/switch.c b/arch/arm64/kvm/hyp/vhe/switch.c
index 034777a..6537f58 100644 (file)
--- a/arch/arm64/kvm/hyp/vhe/switch.c
+++ b/arch/arm64/kvm/hyp/vhe/switch.c
@@ -92,14 +92,28 @@ static void __deactivate_traps(struct kvm_vcpu *vcpu)
 }
 NOKPROBE_SYMBOL(__deactivate_traps);
 
+/*
+ * Disable IRQs in {activate,deactivate}_traps_vhe_{load,put}() to
+ * prevent a race condition between context switching of PMUSERENR_EL0
+ * in __{activate,deactivate}_traps_common() and IPIs that attempts to
+ * update PMUSERENR_EL0. See also kvm_set_pmuserenr().
+ */
 void activate_traps_vhe_load(struct kvm_vcpu *vcpu)
 {
+       unsigned long flags;
+
+       local_irq_save(flags);
        __activate_traps_common(vcpu);
+       local_irq_restore(flags);
 }
 
 void deactivate_traps_vhe_put(struct kvm_vcpu *vcpu)
 {
+       unsigned long flags;
+
+       local_irq_save(flags);
        __deactivate_traps_common(vcpu);
+       local_irq_restore(flags);
 }
 
 static const exit_handler_fn hyp_exit_handlers[] = {
@@ -110,6 +124,7 @@ static const exit_handler_fn hyp_exit_handlers[] = {
        [ESR_ELx_EC_FP_ASIMD]           = kvm_hyp_handle_fpsimd,
        [ESR_ELx_EC_IABT_LOW]           = kvm_hyp_handle_iabt_low,
        [ESR_ELx_EC_DABT_LOW]           = kvm_hyp_handle_dabt_low,
+       [ESR_ELx_EC_WATCHPT_LOW]        = kvm_hyp_handle_watchpt_low,
        [ESR_ELx_EC_PAC]                = kvm_hyp_handle_ptrauth,
 };