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KVM: arm/arm64: vgic: Get rid of live_lrs
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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>
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Christoffer Dall authored and Christoffer Dall committed Apr 9, 2017
1 parent f676958 commit 00dafa0
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Showing 3 changed files with 22 additions and 61 deletions.
2 changes: 0 additions & 2 deletions include/kvm/arm_vgic.h
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Original file line number Diff line number Diff line change
Expand Up @@ -264,8 +264,6 @@ struct vgic_cpu {
*/
struct list_head ap_list_head;

u64 live_lrs;

/*
* Members below are used with GICv3 emulation only and represent
* parts of the redistributor.
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39 changes: 10 additions & 29 deletions virt/kvm/arm/hyp/vgic-v2-sr.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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;
Expand Down Expand Up @@ -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
Expand All @@ -110,20 +103,19 @@ 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);
save_elrsr(vcpu, base);
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;
Expand All @@ -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
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42 changes: 12 additions & 30 deletions virt/kvm/arm/hyp/vgic-v3-sr.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -118,18 +118,16 @@ static void __hyp_text __gic_v3_set_lr(u64 val, int lr)
}
}

static void __hyp_text save_maint_int_state(struct kvm_vcpu *vcpu, int nr_lr)
static void __hyp_text save_maint_int_state(struct kvm_vcpu *vcpu)
{
struct vgic_v3_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v3;
int i;
bool expect_mi;
u64 used_lrs = vcpu->arch.vgic_cpu.used_lrs;

expect_mi = !!(cpu_if->vgic_hcr & ICH_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; i++) {
expect_mi |= (!(cpu_if->vgic_lr[i] & ICH_LR_HW) &&
(cpu_if->vgic_lr[i] & ICH_LR_EOI));
}
Expand All @@ -150,6 +148,7 @@ static void __hyp_text save_maint_int_state(struct kvm_vcpu *vcpu, int nr_lr)
void __hyp_text __vgic_v3_save_state(struct kvm_vcpu *vcpu)
{
struct vgic_v3_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v3;
u64 used_lrs = vcpu->arch.vgic_cpu.used_lrs;
u64 val;

/*
Expand All @@ -159,23 +158,19 @@ void __hyp_text __vgic_v3_save_state(struct kvm_vcpu *vcpu)
if (!cpu_if->vgic_sre)
dsb(st);

if (vcpu->arch.vgic_cpu.live_lrs) {
if (used_lrs) {
int i;
u32 max_lr_idx, nr_pri_bits;
u32 nr_pri_bits;

cpu_if->vgic_elrsr = read_gicreg(ICH_ELSR_EL2);

write_gicreg(0, ICH_HCR_EL2);
val = read_gicreg(ICH_VTR_EL2);
max_lr_idx = vtr_to_max_lr_idx(val);
nr_pri_bits = vtr_to_nr_pri_bits(val);

save_maint_int_state(vcpu, max_lr_idx + 1);

for (i = 0; i <= max_lr_idx; i++) {
if (!(vcpu->arch.vgic_cpu.live_lrs & (1UL << i)))
continue;
save_maint_int_state(vcpu);

for (i = 0; i <= used_lrs; i++) {
if (cpu_if->vgic_elrsr & (1 << i))
cpu_if->vgic_lr[i] &= ~ICH_LR_STATE;
else
Expand Down Expand Up @@ -203,8 +198,6 @@ void __hyp_text __vgic_v3_save_state(struct kvm_vcpu *vcpu)
default:
cpu_if->vgic_ap1r[0] = read_gicreg(ICH_AP1R0_EL2);
}

vcpu->arch.vgic_cpu.live_lrs = 0;
} else {
cpu_if->vgic_misr = 0;
cpu_if->vgic_eisr = 0;
Expand Down Expand Up @@ -232,9 +225,9 @@ void __hyp_text __vgic_v3_save_state(struct kvm_vcpu *vcpu)
void __hyp_text __vgic_v3_restore_state(struct kvm_vcpu *vcpu)
{
struct vgic_v3_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v3;
u64 used_lrs = vcpu->arch.vgic_cpu.used_lrs;
u64 val;
u32 max_lr_idx, nr_pri_bits;
u16 live_lrs = 0;
u32 nr_pri_bits;
int i;

/*
Expand All @@ -251,15 +244,9 @@ void __hyp_text __vgic_v3_restore_state(struct kvm_vcpu *vcpu)
}

val = read_gicreg(ICH_VTR_EL2);
max_lr_idx = vtr_to_max_lr_idx(val);
nr_pri_bits = vtr_to_nr_pri_bits(val);

for (i = 0; i <= max_lr_idx; i++) {
if (cpu_if->vgic_lr[i] & ICH_LR_STATE)
live_lrs |= (1 << i);
}

if (live_lrs) {
if (used_lrs) {
write_gicreg(cpu_if->vgic_hcr, ICH_HCR_EL2);

switch (nr_pri_bits) {
Expand All @@ -282,12 +269,8 @@ void __hyp_text __vgic_v3_restore_state(struct kvm_vcpu *vcpu)
write_gicreg(cpu_if->vgic_ap1r[0], ICH_AP1R0_EL2);
}

for (i = 0; i <= max_lr_idx; i++) {
if (!(live_lrs & (1 << i)))
continue;

for (i = 0; i < used_lrs; i++)
__gic_v3_set_lr(cpu_if->vgic_lr[i], i);
}
}

/*
Expand All @@ -299,7 +282,6 @@ void __hyp_text __vgic_v3_restore_state(struct kvm_vcpu *vcpu)
isb();
dsb(sy);
}
vcpu->arch.vgic_cpu.live_lrs = live_lrs;

/*
* Prevent the guest from touching the GIC system registers if
Expand Down

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