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authorPavel Fedin <p.fedin@samsung.com>2015-10-27 11:37:29 +0300
committerChristoffer Dall <christoffer.dall@linaro.org>2015-11-04 17:29:49 +0300
commitc4cd4c168b81dad53e659d18cdae653bc0ec2384 (patch)
treefe519309bd917369e61cde515ebc7bc9915d9409 /include/kvm
parent5fdf876d30ce7c9b63045b3db8374912ab9b262c (diff)
downloadlinux-c4cd4c168b81dad53e659d18cdae653bc0ec2384.tar.xz
KVM: arm/arm64: Optimize away redundant LR tracking
Currently we use vgic_irq_lr_map in order to track which LRs hold which IRQs, and lr_used bitmap in order to track which LRs are used or free. vgic_irq_lr_map is actually used only for piggy-back optimization, and can be easily replaced by iteration over lr_used. This is good because in future, when LPI support is introduced, number of IRQs will grow up to at least 16384, while numbers from 1024 to 8192 are never going to be used. This would be a huge memory waste. In its turn, lr_used is also completely redundant since ae705930fca6322600690df9dc1c7d0516145a93 ("arm/arm64: KVM: Keep elrsr/aisr in sync with software model"), because together with lr_used we also update elrsr. This allows to easily replace lr_used with elrsr, inverting all conditions (because in elrsr '1' means 'free'). Signed-off-by: Pavel Fedin <p.fedin@samsung.com> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'include/kvm')
-rw-r--r--include/kvm/arm_vgic.h6
1 files changed, 0 insertions, 6 deletions
diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
index 8065801a1847..3936bf802e1d 100644
--- a/include/kvm/arm_vgic.h
+++ b/include/kvm/arm_vgic.h
@@ -295,9 +295,6 @@ struct vgic_v3_cpu_if {
};
struct vgic_cpu {
- /* per IRQ to LR mapping */
- u8 *vgic_irq_lr_map;
-
/* Pending/active/both interrupts on this VCPU */
DECLARE_BITMAP(pending_percpu, VGIC_NR_PRIVATE_IRQS);
DECLARE_BITMAP(active_percpu, VGIC_NR_PRIVATE_IRQS);
@@ -308,9 +305,6 @@ struct vgic_cpu {
unsigned long *active_shared;
unsigned long *pend_act_shared;
- /* Bitmap of used/free list registers */
- DECLARE_BITMAP(lr_used, VGIC_V2_MAX_LRS);
-
/* Number of list registers on this CPU */
int nr_lr;