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ARM: KVM: Enable in-kernel timers with user space gic

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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 <agraf@suse.de>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Message-id: 1498577737-130264-1-git-send-email-agraf@suse.de
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Alexander Graf 2017-07-11 11:21:26 +01:00 • committed by Peter Maydell
parent f986ee1d43
commit 5d721b785f
6 changed files with 82 additions and 0 deletions
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11
include/sysemu/kvm.h
View file

@ -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"