KVM: arm/arm64: vgic: Get rid of live_lrs
There is no need to calculate and maintain live_lrs when we always
populate the lowest numbered LRs first on every entry and clear all LRs
on every exit.
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
diff --git a/virt/kvm/arm/hyp/vgic-v2-sr.c b/virt/kvm/arm/hyp/vgic-v2-sr.c
index d3d3b9b..34b37ce 100644
--- a/virt/kvm/arm/hyp/vgic-v2-sr.c
+++ b/virt/kvm/arm/hyp/vgic-v2-sr.c
@@ -26,27 +26,23 @@ static void __hyp_text save_maint_int_state(struct kvm_vcpu *vcpu,
void __iomem *base)
{
struct vgic_v2_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v2;
- int nr_lr = (kern_hyp_va(&kvm_vgic_global_state))->nr_lr;
+ u64 used_lrs = vcpu->arch.vgic_cpu.used_lrs;
u32 eisr0, eisr1;
int i;
bool expect_mi;
expect_mi = !!(cpu_if->vgic_hcr & GICH_HCR_UIE);
- for (i = 0; i < nr_lr; i++) {
- if (!(vcpu->arch.vgic_cpu.live_lrs & (1UL << i)))
- continue;
-
+ for (i = 0; i < used_lrs && !expect_mi; i++)
expect_mi |= (!(cpu_if->vgic_lr[i] & GICH_LR_HW) &&
(cpu_if->vgic_lr[i] & GICH_LR_EOI));
- }
if (expect_mi) {
cpu_if->vgic_misr = readl_relaxed(base + GICH_MISR);
if (cpu_if->vgic_misr & GICH_MISR_EOI) {
eisr0 = readl_relaxed(base + GICH_EISR0);
- if (unlikely(nr_lr > 32))
+ if (unlikely(used_lrs > 32))
eisr1 = readl_relaxed(base + GICH_EISR1);
else
eisr1 = 0;
@@ -87,13 +83,10 @@ static void __hyp_text save_elrsr(struct kvm_vcpu *vcpu, void __iomem *base)
static void __hyp_text save_lrs(struct kvm_vcpu *vcpu, void __iomem *base)
{
struct vgic_v2_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v2;
- int nr_lr = (kern_hyp_va(&kvm_vgic_global_state))->nr_lr;
int i;
+ u64 used_lrs = vcpu->arch.vgic_cpu.used_lrs;
- for (i = 0; i < nr_lr; i++) {
- if (!(vcpu->arch.vgic_cpu.live_lrs & (1UL << i)))
- continue;
-
+ for (i = 0; i < used_lrs; i++) {
if (cpu_if->vgic_elrsr & (1UL << i))
cpu_if->vgic_lr[i] &= ~GICH_LR_STATE;
else
@@ -110,11 +103,12 @@ void __hyp_text __vgic_v2_save_state(struct kvm_vcpu *vcpu)
struct vgic_v2_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v2;
struct vgic_dist *vgic = &kvm->arch.vgic;
void __iomem *base = kern_hyp_va(vgic->vctrl_base);
+ u64 used_lrs = vcpu->arch.vgic_cpu.used_lrs;
if (!base)
return;
- if (vcpu->arch.vgic_cpu.live_lrs) {
+ if (used_lrs) {
cpu_if->vgic_apr = readl_relaxed(base + GICH_APR);
save_maint_int_state(vcpu, base);
@@ -122,8 +116,6 @@ void __hyp_text __vgic_v2_save_state(struct kvm_vcpu *vcpu)
save_lrs(vcpu, base);
writel_relaxed(0, base + GICH_HCR);
-
- vcpu->arch.vgic_cpu.live_lrs = 0;
} else {
cpu_if->vgic_eisr = 0;
cpu_if->vgic_elrsr = ~0UL;
@@ -139,31 +131,20 @@ void __hyp_text __vgic_v2_restore_state(struct kvm_vcpu *vcpu)
struct vgic_v2_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v2;
struct vgic_dist *vgic = &kvm->arch.vgic;
void __iomem *base = kern_hyp_va(vgic->vctrl_base);
- int nr_lr = (kern_hyp_va(&kvm_vgic_global_state))->nr_lr;
int i;
- u64 live_lrs = 0;
+ u64 used_lrs = vcpu->arch.vgic_cpu.used_lrs;
if (!base)
return;
-
- for (i = 0; i < nr_lr; i++)
- if (cpu_if->vgic_lr[i] & GICH_LR_STATE)
- live_lrs |= 1UL << i;
-
- if (live_lrs) {
+ if (used_lrs) {
writel_relaxed(cpu_if->vgic_hcr, base + GICH_HCR);
writel_relaxed(cpu_if->vgic_apr, base + GICH_APR);
- for (i = 0; i < nr_lr; i++) {
- if (!(live_lrs & (1UL << i)))
- continue;
-
+ for (i = 0; i < used_lrs; i++) {
writel_relaxed(cpu_if->vgic_lr[i],
base + GICH_LR0 + (i * 4));
}
}
-
- vcpu->arch.vgic_cpu.live_lrs = live_lrs;
}
#ifdef CONFIG_ARM64