From: Marc Zyngier Date: Wed, 16 Sep 2015 15:18:59 +0000 (+0100) Subject: arm64: KVM: Disable virtual timer even if the guest is not using it X-Git-Tag: v4.3-rc2~11^2~1^2~3 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=c4cbba9fa078f55d9f6d081dbb4aec7cf969e7c7;p=platform%2Fkernel%2Flinux-exynos.git arm64: KVM: Disable virtual timer even if the guest is not using it When running a guest with the architected timer disabled (with QEMU and the kernel_irqchip=off option, for example), it is important to make sure the timer gets turned off. Otherwise, the guest may try to enable it anyway, leading to a screaming HW interrupt. The fix is to unconditionally turn off the virtual timer on guest exit. Cc: stable@vger.kernel.org Reviewed-by: Christoffer Dall Signed-off-by: Marc Zyngier --- diff --git a/arch/arm64/kvm/hyp.S b/arch/arm64/kvm/hyp.S index 39aa322..60a83e2 100644 --- a/arch/arm64/kvm/hyp.S +++ b/arch/arm64/kvm/hyp.S @@ -562,8 +562,6 @@ mrs x3, cntv_ctl_el0 and x3, x3, #3 str w3, [x0, #VCPU_TIMER_CNTV_CTL] - bic x3, x3, #1 // Clear Enable - msr cntv_ctl_el0, x3 isb @@ -571,6 +569,9 @@ str x3, [x0, #VCPU_TIMER_CNTV_CVAL] 1: + // Disable the virtual timer + msr cntv_ctl_el0, xzr + // Allow physical timer/counter access for the host mrs x2, cnthctl_el2 orr x2, x2, #3