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lines changed Original file line number Diff line number Diff line change @@ -1213,13 +1213,13 @@ static void vmx_vcpu_pi_load(struct kvm_vcpu *vcpu, int cpu)
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new .control ) != old .control );
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/*
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- * Clear SN before reading the bitmap; this ensures that any
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- * interrupt that comes after the bitmap is read sets ON. The
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- * VT-d firmware * writes the bitmap and reads SN atomically (5.2.3
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- * in the spec), so it doesn't really have a memory barrier that
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- * pairs with this. However, we cannot do that and we need one.
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+ * Clear SN before reading the bitmap. The VT-d firmware
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+ * writes the bitmap and reads SN atomically (5.2.3 in the
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+ * spec), so it doesn't really have a memory barrier that
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+ * pairs with this, but we cannot do that and we need one.
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*/
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smp_mb__after_atomic ();
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+
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if (!bitmap_empty ((unsigned long * )pi_desc -> pir , NR_VECTORS ))
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pi_set_on (pi_desc );
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}
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