[RFC 27/55] KVM: arm/arm64: Emulate GICH interface on GICv2

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Emulate GICH interface accesses from the guest hypervisor.

Signed-off-by: Jintack Lim <jintack@xxxxxxxxxxxxxxx>
Signed-off-by: Shih-Wei Li <shihwei@xxxxxxxxxxxxxxx>
Signed-off-by: Christoffer Dall <christoffer.dall@xxxxxxxxxx>
---
 arch/arm64/kvm/Makefile            |   1 +
 virt/kvm/arm/vgic/vgic-v2-nested.c | 207 +++++++++++++++++++++++++++++++++++++
 2 files changed, 208 insertions(+)
 create mode 100644 virt/kvm/arm/vgic/vgic-v2-nested.c

diff --git a/arch/arm64/kvm/Makefile b/arch/arm64/kvm/Makefile
index 9c35e9a..8573faf 100644
--- a/arch/arm64/kvm/Makefile
+++ b/arch/arm64/kvm/Makefile
@@ -37,3 +37,4 @@ kvm-$(CONFIG_KVM_ARM_PMU) += $(KVM)/arm/pmu.o
 
 kvm-$(CONFIG_KVM_ARM_NESTED_HYP) += handle_exit_nested.o
 kvm-$(CONFIG_KVM_ARM_NESTED_HYP) += emulate-nested.o
+kvm-$(CONFIG_KVM_ARM_NESTED_HYP) += $(KVM)/arm/vgic/vgic-v2-nested.o
diff --git a/virt/kvm/arm/vgic/vgic-v2-nested.c b/virt/kvm/arm/vgic/vgic-v2-nested.c
new file mode 100644
index 0000000..b13128e
--- /dev/null
+++ b/virt/kvm/arm/vgic/vgic-v2-nested.c
@@ -0,0 +1,207 @@
+#include <linux/cpu.h>
+#include <linux/kvm.h>
+#include <linux/kvm_host.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>
+
+#include <linux/irqchip/arm-gic.h>
+
+#include <asm/kvm_emulate.h>
+#include <asm/kvm_arm.h>
+#include <asm/kvm_mmu.h>
+#include <kvm/arm_vgic.h>
+
+#include "vgic.h"
+#include "vgic-mmio.h"
+
+static inline struct vgic_v2_cpu_if *vcpu_nested_if(struct kvm_vcpu *vcpu)
+{
+	return &vcpu->arch.vgic_cpu.nested_vgic_v2;
+}
+
+static inline struct vgic_v2_cpu_if *vcpu_shadow_if(struct kvm_vcpu *vcpu)
+{
+	return &vcpu->arch.vgic_cpu.shadow_vgic_v2;
+}
+
+static unsigned long vgic_mmio_read_v2_vtr(struct kvm_vcpu *vcpu,
+					   gpa_t addr, unsigned int len)
+{
+	u32 reg;
+
+	reg = kvm_vgic_global_state.nr_lr - 1;
+	reg |= 0b100 << 26;
+	reg |= 0b100 << 29;
+
+	return reg;
+}
+
+static inline bool lr_triggers_eoi(u32 lr)
+{
+	return !(lr & (GICH_LR_STATE | GICH_LR_HW)) && (lr & GICH_LR_EOI);
+}
+
+static unsigned long get_eisr(struct kvm_vcpu *vcpu, bool upper_reg)
+{
+	struct vgic_v2_cpu_if *cpu_if = vcpu_nested_if(vcpu);
+	int max_lr = upper_reg ? 64 : 32;
+	int min_lr = upper_reg ? 32 : 0;
+	int nr_lr = min(kvm_vgic_global_state.nr_lr, max_lr);
+	int i;
+	u32 reg = 0;
+
+	for (i = min_lr; i < nr_lr; i++) {
+		if (lr_triggers_eoi(cpu_if->vgic_lr[i]))
+			reg |= BIT(i - min_lr);
+	}
+
+	return reg;
+}
+
+static unsigned long vgic_mmio_read_v2_eisr0(struct kvm_vcpu *vcpu,
+					     gpa_t addr, unsigned int len)
+{
+	return get_eisr(vcpu, false);
+}
+
+static unsigned long vgic_mmio_read_v2_eisr1(struct kvm_vcpu *vcpu,
+					     gpa_t addr, unsigned int len)
+{
+	return get_eisr(vcpu, true);
+}
+
+static u32 get_elrsr(struct kvm_vcpu *vcpu, bool upper_reg)
+{
+	struct vgic_v2_cpu_if *cpu_if = vcpu_nested_if(vcpu);
+	int max_lr = upper_reg ? 64 : 32;
+	int min_lr = upper_reg ? 32 : 0;
+	int nr_lr = min(kvm_vgic_global_state.nr_lr, max_lr);
+	u32 reg = 0;
+	int i;
+
+	for (i = min_lr; i < nr_lr; i++) {
+		if (!(cpu_if->vgic_lr[i] & GICH_LR_STATE))
+			reg |= BIT(i - min_lr);
+	}
+
+	return reg;
+}
+
+static unsigned long vgic_mmio_read_v2_elrsr0(struct kvm_vcpu *vcpu,
+					      gpa_t addr, unsigned int len)
+{
+	return get_elrsr(vcpu, false);
+}
+
+static unsigned long vgic_mmio_read_v2_elrsr1(struct kvm_vcpu *vcpu,
+					      gpa_t addr, unsigned int len)
+{
+	return get_elrsr(vcpu, true);
+}
+
+static unsigned long vgic_mmio_read_v2_misr(struct kvm_vcpu *vcpu,
+					    gpa_t addr, unsigned int len)
+{
+	struct vgic_v2_cpu_if *cpu_if = vcpu_nested_if(vcpu);
+	int nr_lr = kvm_vgic_global_state.nr_lr;
+	u32 reg = 0;
+
+	if (vgic_mmio_read_v2_eisr0(vcpu, addr, len) ||
+			vgic_mmio_read_v2_eisr1(vcpu, addr, len))
+		reg |= GICH_MISR_EOI;
+
+	if (cpu_if->vgic_hcr & GICH_HCR_UIE) {
+		u32 elrsr0 = vgic_mmio_read_v2_elrsr0(vcpu, addr, len);
+		u32 elrsr1 = vgic_mmio_read_v2_elrsr1(vcpu, addr, len);
+		int used_lrs;
+
+		used_lrs = nr_lr - (hweight32(elrsr0) + hweight32(elrsr1));
+		if (used_lrs <= 1)
+			reg |= GICH_MISR_U;
+	}
+
+	/* TODO: Support remaining bits in this register */
+	return reg;
+}
+
+static unsigned long vgic_mmio_read_v2_gich(struct kvm_vcpu *vcpu,
+					    gpa_t addr, unsigned int len)
+{
+	struct vgic_v2_cpu_if *cpu_if = vcpu_nested_if(vcpu);
+	u32 value;
+
+	switch (addr & 0xfff) {
+	case GICH_HCR:
+		value = cpu_if->vgic_hcr;
+		break;
+	case GICH_VMCR:
+		value = cpu_if->vgic_vmcr;
+		break;
+	case GICH_APR:
+		value = cpu_if->vgic_apr;
+		break;
+	case GICH_LR0 ... (GICH_LR0 + 4 * (VGIC_V2_MAX_LRS - 1)):
+		value = cpu_if->vgic_lr[(addr & 0xff) >> 2];
+		break;
+	default:
+		return 0;
+	}
+
+	return value;
+}
+
+static void vgic_mmio_write_v2_gich(struct kvm_vcpu *vcpu,
+				    gpa_t addr, unsigned int len,
+				    unsigned long val)
+{
+	struct vgic_v2_cpu_if *cpu_if = vcpu_nested_if(vcpu);
+
+	switch (addr & 0xfff) {
+	case GICH_HCR:
+		cpu_if->vgic_hcr = val;
+		break;
+	case GICH_VMCR:
+		cpu_if->vgic_vmcr = val;
+		break;
+	case GICH_APR:
+		cpu_if->vgic_apr = val;
+		break;
+	case GICH_LR0 ... (GICH_LR0 + 4 * (VGIC_V2_MAX_LRS - 1)):
+		cpu_if->vgic_lr[(addr & 0xff) >> 2] = val;
+		break;
+	}
+}
+
+static const struct vgic_register_region vgic_v2_gich_registers[] = {
+	REGISTER_DESC_WITH_LENGTH(GICH_HCR,
+		vgic_mmio_read_v2_gich, vgic_mmio_write_v2_gich, 4,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_LENGTH(GICH_VTR,
+		vgic_mmio_read_v2_vtr, vgic_mmio_write_wi, 4,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_LENGTH(GICH_VMCR,
+		vgic_mmio_read_v2_gich, vgic_mmio_write_v2_gich, 4,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_LENGTH(GICH_MISR,
+		vgic_mmio_read_v2_misr, vgic_mmio_write_wi, 4,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_LENGTH(GICH_EISR0,
+		vgic_mmio_read_v2_eisr0, vgic_mmio_write_wi, 4,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_LENGTH(GICH_EISR1,
+		vgic_mmio_read_v2_eisr1, vgic_mmio_write_wi, 4,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_LENGTH(GICH_ELRSR0,
+		vgic_mmio_read_v2_elrsr0, vgic_mmio_write_wi, 4,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_LENGTH(GICH_ELRSR1,
+		vgic_mmio_read_v2_elrsr1, vgic_mmio_write_wi, 4,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_LENGTH(GICH_APR,
+		vgic_mmio_read_v2_gich, vgic_mmio_write_v2_gich, 4,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_LENGTH(GICH_LR0,
+		vgic_mmio_read_v2_gich, vgic_mmio_write_v2_gich,
+		4 * VGIC_V2_MAX_LRS, VGIC_ACCESS_32bit),
+};
-- 
1.9.1


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