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authorChristoffer Dall <christoffer.dall@linaro.org>2016-12-22 22:39:10 +0300
committerMarc Zyngier <marc.zyngier@arm.com>2018-03-19 13:53:20 +0300
commit75174ba6ca9dcfddda88aa420da4d7aa2b279fdf (patch)
treec5d1dc7a6af9db67e6fb8fdd36dfce9ddb9844ee /virt/kvm
parentbb5ed7035918d265189e2623d71c8f458713d3e9 (diff)
downloadlinux-75174ba6ca9dcfddda88aa420da4d7aa2b279fdf.tar.xz
KVM: arm/arm64: Handle VGICv2 save/restore from the main VGIC code
We can program the GICv2 hypervisor control interface logic directly from the core vgic code and can instead do the save/restore directly from the flush/sync functions, which can lead to a number of future optimizations. Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'virt/kvm')
-rw-r--r--virt/kvm/arm/hyp/vgic-v2-sr.c65
-rw-r--r--virt/kvm/arm/vgic/vgic-v2.c63
-rw-r--r--virt/kvm/arm/vgic/vgic.c19
-rw-r--r--virt/kvm/arm/vgic/vgic.h3
4 files changed, 84 insertions, 66 deletions
diff --git a/virt/kvm/arm/hyp/vgic-v2-sr.c b/virt/kvm/arm/hyp/vgic-v2-sr.c
index a91b0d2b9249..0bbafdfd4adb 100644
--- a/virt/kvm/arm/hyp/vgic-v2-sr.c
+++ b/virt/kvm/arm/hyp/vgic-v2-sr.c
@@ -23,71 +23,6 @@
#include <asm/kvm_hyp.h>
#include <asm/kvm_mmu.h>
-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;
- u64 used_lrs = vcpu->arch.vgic_cpu.used_lrs;
- u64 elrsr;
- int i;
-
- elrsr = readl_relaxed(base + GICH_ELRSR0);
- if (unlikely(used_lrs > 32))
- elrsr |= ((u64)readl_relaxed(base + GICH_ELRSR1)) << 32;
-
- for (i = 0; i < used_lrs; i++) {
- if (elrsr & (1UL << i))
- cpu_if->vgic_lr[i] &= ~GICH_LR_STATE;
- else
- cpu_if->vgic_lr[i] = readl_relaxed(base + GICH_LR0 + (i * 4));
-
- writel_relaxed(0, base + GICH_LR0 + (i * 4));
- }
-}
-
-/* vcpu is already in the HYP VA space */
-void __hyp_text __vgic_v2_save_state(struct kvm_vcpu *vcpu)
-{
- struct kvm *kvm = kern_hyp_va(vcpu->kvm);
- 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 (used_lrs) {
- cpu_if->vgic_apr = readl_relaxed(base + GICH_APR);
- save_lrs(vcpu, base);
- writel_relaxed(0, base + GICH_HCR);
- } else {
- cpu_if->vgic_apr = 0;
- }
-}
-
-/* vcpu is already in the HYP VA space */
-void __hyp_text __vgic_v2_restore_state(struct kvm_vcpu *vcpu)
-{
- struct kvm *kvm = kern_hyp_va(vcpu->kvm);
- 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 i;
- u64 used_lrs = vcpu->arch.vgic_cpu.used_lrs;
-
- if (!base)
- return;
-
- 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 < used_lrs; i++) {
- writel_relaxed(cpu_if->vgic_lr[i],
- base + GICH_LR0 + (i * 4));
- }
- }
-}
-
#ifdef CONFIG_ARM64
/*
* __vgic_v2_perform_cpuif_access -- perform a GICV access on behalf of the
diff --git a/virt/kvm/arm/vgic/vgic-v2.c b/virt/kvm/arm/vgic/vgic-v2.c
index bb305d49cfdd..1e5f3eb6973d 100644
--- a/virt/kvm/arm/vgic/vgic-v2.c
+++ b/virt/kvm/arm/vgic/vgic-v2.c
@@ -421,6 +421,69 @@ out:
return ret;
}
+static void save_lrs(struct kvm_vcpu *vcpu, void __iomem *base)
+{
+ struct vgic_v2_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v2;
+ u64 used_lrs = vcpu->arch.vgic_cpu.used_lrs;
+ u64 elrsr;
+ int i;
+
+ elrsr = readl_relaxed(base + GICH_ELRSR0);
+ if (unlikely(used_lrs > 32))
+ elrsr |= ((u64)readl_relaxed(base + GICH_ELRSR1)) << 32;
+
+ for (i = 0; i < used_lrs; i++) {
+ if (elrsr & (1UL << i))
+ cpu_if->vgic_lr[i] &= ~GICH_LR_STATE;
+ else
+ cpu_if->vgic_lr[i] = readl_relaxed(base + GICH_LR0 + (i * 4));
+
+ writel_relaxed(0, base + GICH_LR0 + (i * 4));
+ }
+}
+
+void vgic_v2_save_state(struct kvm_vcpu *vcpu)
+{
+ struct kvm *kvm = vcpu->kvm;
+ struct vgic_dist *vgic = &kvm->arch.vgic;
+ struct vgic_v2_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v2;
+ void __iomem *base = vgic->vctrl_base;
+ u64 used_lrs = vcpu->arch.vgic_cpu.used_lrs;
+
+ if (!base)
+ return;
+
+ if (used_lrs) {
+ cpu_if->vgic_apr = readl_relaxed(base + GICH_APR);
+ save_lrs(vcpu, base);
+ writel_relaxed(0, base + GICH_HCR);
+ } else {
+ cpu_if->vgic_apr = 0;
+ }
+}
+
+void vgic_v2_restore_state(struct kvm_vcpu *vcpu)
+{
+ struct kvm *kvm = vcpu->kvm;
+ struct vgic_dist *vgic = &kvm->arch.vgic;
+ struct vgic_v2_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v2;
+ void __iomem *base = vgic->vctrl_base;
+ u64 used_lrs = vcpu->arch.vgic_cpu.used_lrs;
+ int i;
+
+ if (!base)
+ return;
+
+ 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 < used_lrs; i++) {
+ writel_relaxed(cpu_if->vgic_lr[i],
+ base + GICH_LR0 + (i * 4));
+ }
+ }
+}
+
void vgic_v2_load(struct kvm_vcpu *vcpu)
{
struct vgic_v2_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v2;
diff --git a/virt/kvm/arm/vgic/vgic.c b/virt/kvm/arm/vgic/vgic.c
index c7c5ef190afa..12e2a28f437e 100644
--- a/virt/kvm/arm/vgic/vgic.c
+++ b/virt/kvm/arm/vgic/vgic.c
@@ -749,11 +749,19 @@ next:
vgic_clear_lr(vcpu, count);
}
+static inline void vgic_save_state(struct kvm_vcpu *vcpu)
+{
+ if (!static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif))
+ vgic_v2_save_state(vcpu);
+}
+
/* Sync back the hardware VGIC state into our emulation after a guest's run. */
void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu)
{
struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+ vgic_save_state(vcpu);
+
WARN_ON(vgic_v4_sync_hwstate(vcpu));
/* An empty ap_list_head implies used_lrs == 0 */
@@ -765,6 +773,12 @@ void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu)
vgic_prune_ap_list(vcpu);
}
+static inline void vgic_restore_state(struct kvm_vcpu *vcpu)
+{
+ if (!static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif))
+ vgic_v2_restore_state(vcpu);
+}
+
/* Flush our emulation state into the GIC hardware before entering the guest. */
void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu)
{
@@ -780,13 +794,16 @@ void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu)
* this.
*/
if (list_empty(&vcpu->arch.vgic_cpu.ap_list_head))
- return;
+ goto out;
DEBUG_SPINLOCK_BUG_ON(!irqs_disabled());
spin_lock(&vcpu->arch.vgic_cpu.ap_list_lock);
vgic_flush_lr_state(vcpu);
spin_unlock(&vcpu->arch.vgic_cpu.ap_list_lock);
+
+out:
+ vgic_restore_state(vcpu);
}
void kvm_vgic_load(struct kvm_vcpu *vcpu)
diff --git a/virt/kvm/arm/vgic/vgic.h b/virt/kvm/arm/vgic/vgic.h
index 12c37b89f7a3..89b9547fba27 100644
--- a/virt/kvm/arm/vgic/vgic.h
+++ b/virt/kvm/arm/vgic/vgic.h
@@ -176,6 +176,9 @@ void vgic_v2_init_lrs(void);
void vgic_v2_load(struct kvm_vcpu *vcpu);
void vgic_v2_put(struct kvm_vcpu *vcpu);
+void vgic_v2_save_state(struct kvm_vcpu *vcpu);
+void vgic_v2_restore_state(struct kvm_vcpu *vcpu);
+
static inline void vgic_get_irq_kref(struct vgic_irq *irq)
{
if (irq->intid < VGIC_MIN_LPI)