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authorAlexander Graf <agraf@suse.de>2017-07-11 11:21:26 +0100
committerPeter Maydell <peter.maydell@linaro.org>2017-07-11 11:21:26 +0100
commit5d721b785fbe80170fc756e9444cf751d3a47568 (patch)
treebfd169dc02c4d5550e1714e436eff3174817a0be /hw/intc
parentf986ee1d43004a336197ee012e901f44bba04785 (diff)
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 <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>
Diffstat (limited to 'hw/intc')
-rw-r--r--hw/intc/arm_gic.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/hw/intc/arm_gic.c b/hw/intc/arm_gic.c
index b305d9032a..5a0e2a3c1a 100644
--- a/hw/intc/arm_gic.c
+++ b/hw/intc/arm_gic.c
@@ -25,6 +25,7 @@
#include "qom/cpu.h"
#include "qemu/log.h"
#include "trace.h"
+#include "sysemu/kvm.h"
/* #define DEBUG_GIC */
@@ -1412,6 +1413,12 @@ static void arm_gic_realize(DeviceState *dev, Error **errp)
return;
}
+ if (kvm_enabled() && !kvm_arm_supports_user_irq()) {
+ error_setg(errp, "KVM with user space irqchip only works when the "
+ "host kernel supports KVM_CAP_ARM_USER_IRQ");
+ return;
+ }
+
/* This creates distributor and main CPU interface (s->cpuiomem[0]) */
gic_init_irqs_and_mmio(s, gic_set_irq, gic_ops);