ARM: KVM: vgic: simplify vgic_get_target_reg

vgic_get_target_reg is quite complicated, for no good reason.
Actually, it is fairly easy to write it in a much more efficient
way by using the target CPU array instead of the bitmap.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
(cherry picked from commit 986af8e0789a41ac4844e6eefed4a33e86524918)
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>

diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index 17c5ac7d10ed173753dd96ae4a7b25aa3106998b..a2d478aec046ce1cec7cfc8a3ddc5ed968acdb57 100644 (file)
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -432,19 +432,13 @@ static bool handle_mmio_priority_reg(struct kvm_vcpu *vcpu,
 static u32 vgic_get_target_reg(struct kvm *kvm, int irq)
 {
        struct vgic_dist *dist = &kvm->arch.vgic;
-       struct kvm_vcpu *vcpu;
-       int i, c;
-       unsigned long *bmap;
+       int i;
        u32 val = 0;
 
        irq -= VGIC_NR_PRIVATE_IRQS;
 
-       kvm_for_each_vcpu(c, vcpu, kvm) {
-               bmap = vgic_bitmap_get_shared_map(&dist->irq_spi_target[c]);
-               for (i = 0; i < GICD_IRQS_PER_ITARGETSR; i++)
-                       if (test_bit(irq + i, bmap))
-                               val |= 1 << (c + i * 8);
-       }
+       for (i = 0; i < GICD_IRQS_PER_ITARGETSR; i++)
+               val |= 1 << (dist->irq_spi_cpu[irq + i] + i * 8);
 
        return val;
 }