From 5d721b785fbe80170fc756e9444cf751d3a47568 Mon Sep 17 00:00:00 2001 From: Alexander Graf Date: Tue, 11 Jul 2017 11:21:26 +0100 Subject: ARM: KVM: Enable in-kernel timers with user space gic When running with KVM enabled, you can choose between emulating the gic in kernel or user space. If the kernel supports in-kernel virtualization of the interrupt controller, it will default to that. If not, if will default to user space emulation. Unfortunately when running in user mode gic emulation, we miss out on interrupt events which are only available from kernel space, such as the timer. This patch leverages the new kernel/user space pending line synchronization for timer events. It does not handle PMU events yet. Signed-off-by: Alexander Graf Reviewed-by: Andrew Jones Message-id: 1498577737-130264-1-git-send-email-agraf@suse.de Signed-off-by: Peter Maydell --- include/sysemu/kvm.h | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'include') diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h index 052e11f621..91fc07ee9a 100644 --- a/include/sysemu/kvm.h +++ b/include/sysemu/kvm.h @@ -220,6 +220,17 @@ int kvm_init_vcpu(CPUState *cpu); int kvm_cpu_exec(CPUState *cpu); int kvm_destroy_vcpu(CPUState *cpu); +/** + * kvm_arm_supports_user_irq + * + * Not all KVM implementations support notifications for kernel generated + * interrupt events to user space. This function indicates whether the current + * KVM implementation does support them. + * + * Returns: true if KVM supports using kernel generated IRQs from user space + */ +bool kvm_arm_supports_user_irq(void); + #ifdef NEED_CPU_H #include "cpu.h" -- cgit v1.2.3-55-g7522