[PATCH v2 35/36] KVM: arm/arm64: Move VGIC APR save/restore to vgic put/load
Christoffer Dall
christoffer.dall at linaro.org
Thu Dec 7 09:06:29 PST 2017
The APRs can only have bits set when the guest acknowledges an interrupt
in the LR and can only have a bit cleared when the guest EOIs an
interrupt in the LR. Therefore, if we have no LRs with any
pending/active interrupts, the APR cannot change value and there is no
need to clear it on every exit from the VM (hint: it will have already
been cleared when we exited the guest the last time with the LRs all
EOIed).
The only case we need to take care of is when we migrate the VCPU away
from a CPU or migrate a new VCPU onto a CPU, or when we return to
userspace to capture the state of the VCPU for migration. To make sure
this works, factor out the APR save/restore functionality into separate
functions called from the VCPU (and by extension VGIC) put/load hooks.
Signed-off-by: Christoffer Dall <christoffer.dall at linaro.org>
---
arch/arm/include/asm/kvm_hyp.h | 2 +
arch/arm64/include/asm/kvm_hyp.h | 2 +
virt/kvm/arm/hyp/vgic-v3-sr.c | 123 +++++++++++++++++++++------------------
virt/kvm/arm/vgic/vgic-v2.c | 7 +--
virt/kvm/arm/vgic/vgic-v3.c | 5 ++
5 files changed, 77 insertions(+), 62 deletions(-)
diff --git a/arch/arm/include/asm/kvm_hyp.h b/arch/arm/include/asm/kvm_hyp.h
index ab20ffa8b9e7..b3dd4f4304f5 100644
--- a/arch/arm/include/asm/kvm_hyp.h
+++ b/arch/arm/include/asm/kvm_hyp.h
@@ -109,6 +109,8 @@ void __sysreg_restore_state(struct kvm_cpu_context *ctxt);
void __vgic_v3_save_state(struct kvm_vcpu *vcpu);
void __vgic_v3_restore_state(struct kvm_vcpu *vcpu);
+void __vgic_v3_save_aprs(struct kvm_vcpu *vcpu);
+void __vgic_v3_restore_aprs(struct kvm_vcpu *vcpu);
asmlinkage void __vfp_save_state(struct vfp_hard_struct *vfp);
asmlinkage void __vfp_restore_state(struct vfp_hard_struct *vfp);
diff --git a/arch/arm64/include/asm/kvm_hyp.h b/arch/arm64/include/asm/kvm_hyp.h
index bd3fe6446728..62872ceefa33 100644
--- a/arch/arm64/include/asm/kvm_hyp.h
+++ b/arch/arm64/include/asm/kvm_hyp.h
@@ -125,6 +125,8 @@ int __vgic_v2_perform_cpuif_access(struct kvm_vcpu *vcpu);
void __vgic_v3_save_state(struct kvm_vcpu *vcpu);
void __vgic_v3_restore_state(struct kvm_vcpu *vcpu);
+void __vgic_v3_save_aprs(struct kvm_vcpu *vcpu);
+void __vgic_v3_restore_aprs(struct kvm_vcpu *vcpu);
int __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu);
void __timer_enable_traps(struct kvm_vcpu *vcpu);
diff --git a/virt/kvm/arm/hyp/vgic-v3-sr.c b/virt/kvm/arm/hyp/vgic-v3-sr.c
index 9abf2f3c12b5..811b42c8441d 100644
--- a/virt/kvm/arm/hyp/vgic-v3-sr.c
+++ b/virt/kvm/arm/hyp/vgic-v3-sr.c
@@ -221,14 +221,11 @@ void __hyp_text __vgic_v3_save_state(struct kvm_vcpu *vcpu)
if (used_lrs) {
int i;
- u32 nr_pre_bits;
u32 elrsr;
elrsr = read_gicreg(ICH_ELSR_EL2);
write_gicreg(0, ICH_HCR_EL2);
- val = read_gicreg(ICH_VTR_EL2);
- nr_pre_bits = vtr_to_nr_pre_bits(val);
for (i = 0; i < used_lrs; i++) {
if (elrsr & (1 << i))
@@ -238,39 +235,10 @@ void __hyp_text __vgic_v3_save_state(struct kvm_vcpu *vcpu)
__gic_v3_set_lr(0, i);
}
-
- switch (nr_pre_bits) {
- case 7:
- cpu_if->vgic_ap0r[3] = __vgic_v3_read_ap0rn(3);
- cpu_if->vgic_ap0r[2] = __vgic_v3_read_ap0rn(2);
- case 6:
- cpu_if->vgic_ap0r[1] = __vgic_v3_read_ap0rn(1);
- default:
- cpu_if->vgic_ap0r[0] = __vgic_v3_read_ap0rn(0);
- }
-
- switch (nr_pre_bits) {
- case 7:
- cpu_if->vgic_ap1r[3] = __vgic_v3_read_ap1rn(3);
- cpu_if->vgic_ap1r[2] = __vgic_v3_read_ap1rn(2);
- case 6:
- cpu_if->vgic_ap1r[1] = __vgic_v3_read_ap1rn(1);
- default:
- cpu_if->vgic_ap1r[0] = __vgic_v3_read_ap1rn(0);
- }
} else {
if (static_branch_unlikely(&vgic_v3_cpuif_trap) ||
cpu_if->its_vpe.its_vm)
write_gicreg(0, ICH_HCR_EL2);
-
- cpu_if->vgic_ap0r[0] = 0;
- cpu_if->vgic_ap0r[1] = 0;
- cpu_if->vgic_ap0r[2] = 0;
- cpu_if->vgic_ap0r[3] = 0;
- cpu_if->vgic_ap1r[0] = 0;
- cpu_if->vgic_ap1r[1] = 0;
- cpu_if->vgic_ap1r[2] = 0;
- cpu_if->vgic_ap1r[3] = 0;
}
val = read_gicreg(ICC_SRE_EL2);
@@ -287,8 +255,6 @@ 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 nr_pre_bits;
int i;
/*
@@ -306,32 +272,9 @@ void __hyp_text __vgic_v3_restore_state(struct kvm_vcpu *vcpu)
write_gicreg(cpu_if->vgic_vmcr, ICH_VMCR_EL2);
}
- val = read_gicreg(ICH_VTR_EL2);
- nr_pre_bits = vtr_to_nr_pre_bits(val);
-
if (used_lrs) {
write_gicreg(cpu_if->vgic_hcr, ICH_HCR_EL2);
- switch (nr_pre_bits) {
- case 7:
- __vgic_v3_write_ap0rn(cpu_if->vgic_ap0r[3], 3);
- __vgic_v3_write_ap0rn(cpu_if->vgic_ap0r[2], 2);
- case 6:
- __vgic_v3_write_ap0rn(cpu_if->vgic_ap0r[1], 1);
- default:
- __vgic_v3_write_ap0rn(cpu_if->vgic_ap0r[0], 0);
- }
-
- switch (nr_pre_bits) {
- case 7:
- __vgic_v3_write_ap1rn(cpu_if->vgic_ap1r[3], 3);
- __vgic_v3_write_ap1rn(cpu_if->vgic_ap1r[2], 2);
- case 6:
- __vgic_v3_write_ap1rn(cpu_if->vgic_ap1r[1], 1);
- default:
- __vgic_v3_write_ap1rn(cpu_if->vgic_ap1r[0], 0);
- }
-
for (i = 0; i < used_lrs; i++)
__gic_v3_set_lr(cpu_if->vgic_lr[i], i);
} else {
@@ -364,6 +307,72 @@ void __hyp_text __vgic_v3_restore_state(struct kvm_vcpu *vcpu)
ICC_SRE_EL2);
}
+void __hyp_text __vgic_v3_save_aprs(struct kvm_vcpu *vcpu)
+{
+ struct vgic_v3_cpu_if *cpu_if;
+ u64 val;
+ u32 nr_pre_bits;
+
+ vcpu = kern_hyp_va(vcpu);
+ cpu_if = &vcpu->arch.vgic_cpu.vgic_v3;
+
+ val = read_gicreg(ICH_VTR_EL2);
+ nr_pre_bits = vtr_to_nr_pre_bits(val);
+
+ switch (nr_pre_bits) {
+ case 7:
+ cpu_if->vgic_ap0r[3] = __vgic_v3_read_ap0rn(3);
+ cpu_if->vgic_ap0r[2] = __vgic_v3_read_ap0rn(2);
+ case 6:
+ cpu_if->vgic_ap0r[1] = __vgic_v3_read_ap0rn(1);
+ default:
+ cpu_if->vgic_ap0r[0] = __vgic_v3_read_ap0rn(0);
+ }
+
+ switch (nr_pre_bits) {
+ case 7:
+ cpu_if->vgic_ap1r[3] = __vgic_v3_read_ap1rn(3);
+ cpu_if->vgic_ap1r[2] = __vgic_v3_read_ap1rn(2);
+ case 6:
+ cpu_if->vgic_ap1r[1] = __vgic_v3_read_ap1rn(1);
+ default:
+ cpu_if->vgic_ap1r[0] = __vgic_v3_read_ap1rn(0);
+ }
+}
+
+void __hyp_text __vgic_v3_restore_aprs(struct kvm_vcpu *vcpu)
+{
+ struct vgic_v3_cpu_if *cpu_if;
+ u64 val;
+ u32 nr_pre_bits;
+
+ vcpu = kern_hyp_va(vcpu);
+ cpu_if = &vcpu->arch.vgic_cpu.vgic_v3;
+
+ val = read_gicreg(ICH_VTR_EL2);
+ nr_pre_bits = vtr_to_nr_pre_bits(val);
+
+ switch (nr_pre_bits) {
+ case 7:
+ __vgic_v3_write_ap0rn(cpu_if->vgic_ap0r[3], 3);
+ __vgic_v3_write_ap0rn(cpu_if->vgic_ap0r[2], 2);
+ case 6:
+ __vgic_v3_write_ap0rn(cpu_if->vgic_ap0r[1], 1);
+ default:
+ __vgic_v3_write_ap0rn(cpu_if->vgic_ap0r[0], 0);
+ }
+
+ switch (nr_pre_bits) {
+ case 7:
+ __vgic_v3_write_ap1rn(cpu_if->vgic_ap1r[3], 3);
+ __vgic_v3_write_ap1rn(cpu_if->vgic_ap1r[2], 2);
+ case 6:
+ __vgic_v3_write_ap1rn(cpu_if->vgic_ap1r[1], 1);
+ default:
+ __vgic_v3_write_ap1rn(cpu_if->vgic_ap1r[0], 0);
+ }
+}
+
void __hyp_text __vgic_v3_init_lrs(void)
{
int max_lr_idx = vtr_to_max_lr_idx(read_gicreg(ICH_VTR_EL2));
diff --git a/virt/kvm/arm/vgic/vgic-v2.c b/virt/kvm/arm/vgic/vgic-v2.c
index 1e5f3eb6973d..ca7cfee9f353 100644
--- a/virt/kvm/arm/vgic/vgic-v2.c
+++ b/virt/kvm/arm/vgic/vgic-v2.c
@@ -446,7 +446,6 @@ 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;
@@ -454,11 +453,8 @@ void vgic_v2_save_state(struct kvm_vcpu *vcpu)
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;
}
}
@@ -476,7 +472,6 @@ void vgic_v2_restore_state(struct kvm_vcpu *vcpu)
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));
@@ -490,6 +485,7 @@ void vgic_v2_load(struct kvm_vcpu *vcpu)
struct vgic_dist *vgic = &vcpu->kvm->arch.vgic;
writel_relaxed(cpu_if->vgic_vmcr, vgic->vctrl_base + GICH_VMCR);
+ writel_relaxed(cpu_if->vgic_apr, vgic->vctrl_base + GICH_APR);
}
void vgic_v2_put(struct kvm_vcpu *vcpu)
@@ -498,4 +494,5 @@ void vgic_v2_put(struct kvm_vcpu *vcpu)
struct vgic_dist *vgic = &vcpu->kvm->arch.vgic;
cpu_if->vgic_vmcr = readl_relaxed(vgic->vctrl_base + GICH_VMCR);
+ cpu_if->vgic_apr = readl_relaxed(vgic->vctrl_base + GICH_APR);
}
diff --git a/virt/kvm/arm/vgic/vgic-v3.c b/virt/kvm/arm/vgic/vgic-v3.c
index b76e21f3e6bd..4bafcd1e6bb8 100644
--- a/virt/kvm/arm/vgic/vgic-v3.c
+++ b/virt/kvm/arm/vgic/vgic-v3.c
@@ -16,6 +16,7 @@
#include <linux/kvm.h>
#include <linux/kvm_host.h>
#include <kvm/arm_vgic.h>
+#include <asm/kvm_hyp.h>
#include <asm/kvm_mmu.h>
#include <asm/kvm_asm.h>
@@ -587,6 +588,8 @@ void vgic_v3_load(struct kvm_vcpu *vcpu)
*/
if (likely(cpu_if->vgic_sre))
kvm_call_hyp(__vgic_v3_write_vmcr, cpu_if->vgic_vmcr);
+
+ kvm_call_hyp(__vgic_v3_restore_aprs, vcpu);
}
void vgic_v3_put(struct kvm_vcpu *vcpu)
@@ -595,4 +598,6 @@ void vgic_v3_put(struct kvm_vcpu *vcpu)
if (likely(cpu_if->vgic_sre))
cpu_if->vgic_vmcr = kvm_call_hyp(__vgic_v3_read_vmcr);
+
+ kvm_call_hyp(__vgic_v3_save_aprs, vcpu);
}
--
2.14.2
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