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arm/arm64: KVM: arch timer: Reset CNTV_CTL to 0

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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>
This commit is contained in:
Christoffer Dall 2015-09-04 16:24:39 +02:00 committed by Marc Zyngier
parent 04bdfa8ab5
commit 4ad9e16af3
1 changed files with 8 additions and 0 deletions
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8
virt/kvm/arm/arch_timer.c
View file

@ -199,6 +199,14 @@ 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.