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authorChristoffer Dall <christoffer.dall@linaro.org>2015-09-04 17:24:39 +0300
committerMarc Zyngier <marc.zyngier@arm.com>2015-09-04 18:26:56 +0300
commit4ad9e16af36bbe8657aabe494ff912acbc213ce4 (patch)
tree86378d7e90070176a254c4fbb3682eb38cacd759 /virt/kvm/arm
parent04bdfa8ab5bab929cc57f73952c503a88372601d (diff)
downloadlinux-4ad9e16af36bbe8657aabe494ff912acbc213ce4.tar.xz
arm/arm64: KVM: arch timer: Reset CNTV_CTL to 0
Provide a better quality of implementation and be architecture compliant on ARMv7 for the architected timer by resetting the CNTV_CTL to 0 on reset of the timer. This change alone fixes the UEFI reset issue reported by Laszlo back in February. Cc: Laszlo Ersek <lersek@redhat.com> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Drew Jones <drjones@redhat.com> Cc: Wei Huang <wei@redhat.com> Cc: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'virt/kvm/arm')
-rw-r--r--virt/kvm/arm/arch_timer.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/virt/kvm/arm/arch_timer.c b/virt/kvm/arm/arch_timer.c
index 76e38d231e99..48c6e1ac6827 100644
--- a/virt/kvm/arm/arch_timer.c
+++ b/virt/kvm/arm/arch_timer.c
@@ -200,6 +200,14 @@ int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu,
timer->irq = irq;
/*
+ * The bits in CNTV_CTL are architecturally reset to UNKNOWN for ARMv8
+ * and to 0 for ARMv7. We provide an implementation that always
+ * resets the timer to be disabled and unmasked and is compliant with
+ * the ARMv7 architecture.
+ */
+ timer->cntv_ctl = 0;
+
+ /*
* Tell the VGIC that the virtual interrupt is tied to a
* physical interrupt. We do that once per VCPU.
*/