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KVM: PPC: Fix DEC truncation for greater than 0xffff_ffff/1000
kvmppc_emulate_dec() uses dec_nsec of type unsigned long and does below calculation: dec_nsec = vcpu->arch.dec; dec_nsec *= 1000; This will truncate if DEC value "vcpu->arch.dec" is greater than 0xffff_ffff/1000. For example : For tb_ticks_per_usec = 4a, we can not set decrementer more than ~58ms. Signed-off-by: Bharat Bhushan <bharat.bhushan@freescale.com> Acked-by: Liu Yu <yu.liu@freescale.com> Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
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@ -84,6 +84,7 @@ static int kvmppc_dec_enabled(struct kvm_vcpu *vcpu)
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void kvmppc_emulate_dec(struct kvm_vcpu *vcpu)
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void kvmppc_emulate_dec(struct kvm_vcpu *vcpu)
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{
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{
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unsigned long dec_nsec;
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unsigned long dec_nsec;
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unsigned long long dec_time;
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pr_debug("mtDEC: %x\n", vcpu->arch.dec);
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pr_debug("mtDEC: %x\n", vcpu->arch.dec);
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#ifdef CONFIG_PPC_BOOK3S
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#ifdef CONFIG_PPC_BOOK3S
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@ -103,11 +104,12 @@ void kvmppc_emulate_dec(struct kvm_vcpu *vcpu)
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* host ticks. */
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* host ticks. */
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hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
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hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
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dec_nsec = vcpu->arch.dec;
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dec_time = vcpu->arch.dec;
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dec_nsec *= 1000;
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dec_time *= 1000;
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dec_nsec /= tb_ticks_per_usec;
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do_div(dec_time, tb_ticks_per_usec);
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hrtimer_start(&vcpu->arch.dec_timer, ktime_set(0, dec_nsec),
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dec_nsec = do_div(dec_time, NSEC_PER_SEC);
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HRTIMER_MODE_REL);
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hrtimer_start(&vcpu->arch.dec_timer,
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ktime_set(dec_time, dec_nsec), HRTIMER_MODE_REL);
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vcpu->arch.dec_jiffies = get_tb();
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vcpu->arch.dec_jiffies = get_tb();
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} else {
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} else {
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hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
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hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
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