arm64: KVM: Move vgic-v3 save/restore to virt/kvm/arm/hyp

So we can reuse the code under arch/arm

Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>

2 files changed, 1 insertions, 329 deletions

diff --git a/arch/arm64/kvm/hyp/Makefile b/arch/arm64/kvm/hyp/Makefile
index 0c85febcc1eb..aaf42ae8d8c3 100644
--- a/arch/arm64/kvm/hyp/Makefile
+++ b/arch/arm64/kvm/hyp/Makefile
@@ -5,9 +5,9 @@
 KVM=../../../../virt/kvm
 
 obj-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/hyp/vgic-v2-sr.o
+obj-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/hyp/vgic-v3-sr.o
 obj-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/hyp/timer-sr.o
 
-obj-$(CONFIG_KVM_ARM_HOST) += vgic-v3-sr.o
 obj-$(CONFIG_KVM_ARM_HOST) += sysreg-sr.o
 obj-$(CONFIG_KVM_ARM_HOST) += debug-sr.o
 obj-$(CONFIG_KVM_ARM_HOST) += entry.o
diff --git a/arch/arm64/kvm/hyp/vgic-v3-sr.c b/arch/arm64/kvm/hyp/vgic-v3-sr.c
deleted file mode 100644
index 3947095cc0a1..000000000000
--- a/arch/arm64/kvm/hyp/vgic-v3-sr.c
+++ /dev/null
@@ -1,328 +0,0 @@
-/*
- * Copyright (C) 2012-2015 - ARM Ltd
- * Author: Marc Zyngier <marc.zyngier@arm.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-#include <linux/compiler.h>
-#include <linux/irqchip/arm-gic-v3.h>
-#include <linux/kvm_host.h>
-
-#include <asm/kvm_hyp.h>
-
-#define vtr_to_max_lr_idx(v)		((v) & 0xf)
-#define vtr_to_nr_pri_bits(v)		(((u32)(v) >> 29) + 1)
-
-static u64 __hyp_text __gic_v3_get_lr(unsigned int lr)
-{
-	switch (lr & 0xf) {
-	case 0:
-		return read_gicreg(ICH_LR0_EL2);
-	case 1:
-		return read_gicreg(ICH_LR1_EL2);
-	case 2:
-		return read_gicreg(ICH_LR2_EL2);
-	case 3:
-		return read_gicreg(ICH_LR3_EL2);
-	case 4:
-		return read_gicreg(ICH_LR4_EL2);
-	case 5:
-		return read_gicreg(ICH_LR5_EL2);
-	case 6:
-		return read_gicreg(ICH_LR6_EL2);
-	case 7:
-		return read_gicreg(ICH_LR7_EL2);
-	case 8:
-		return read_gicreg(ICH_LR8_EL2);
-	case 9:
-		return read_gicreg(ICH_LR9_EL2);
-	case 10:
-		return read_gicreg(ICH_LR10_EL2);
-	case 11:
-		return read_gicreg(ICH_LR11_EL2);
-	case 12:
-		return read_gicreg(ICH_LR12_EL2);
-	case 13:
-		return read_gicreg(ICH_LR13_EL2);
-	case 14:
-		return read_gicreg(ICH_LR14_EL2);
-	case 15:
-		return read_gicreg(ICH_LR15_EL2);
-	}
-
-	unreachable();
-}
-
-static void __hyp_text __gic_v3_set_lr(u64 val, int lr)
-{
-	switch (lr & 0xf) {
-	case 0:
-		write_gicreg(val, ICH_LR0_EL2);
-		break;
-	case 1:
-		write_gicreg(val, ICH_LR1_EL2);
-		break;
-	case 2:
-		write_gicreg(val, ICH_LR2_EL2);
-		break;
-	case 3:
-		write_gicreg(val, ICH_LR3_EL2);
-		break;
-	case 4:
-		write_gicreg(val, ICH_LR4_EL2);
-		break;
-	case 5:
-		write_gicreg(val, ICH_LR5_EL2);
-		break;
-	case 6:
-		write_gicreg(val, ICH_LR6_EL2);
-		break;
-	case 7:
-		write_gicreg(val, ICH_LR7_EL2);
-		break;
-	case 8:
-		write_gicreg(val, ICH_LR8_EL2);
-		break;
-	case 9:
-		write_gicreg(val, ICH_LR9_EL2);
-		break;
-	case 10:
-		write_gicreg(val, ICH_LR10_EL2);
-		break;
-	case 11:
-		write_gicreg(val, ICH_LR11_EL2);
-		break;
-	case 12:
-		write_gicreg(val, ICH_LR12_EL2);
-		break;
-	case 13:
-		write_gicreg(val, ICH_LR13_EL2);
-		break;
-	case 14:
-		write_gicreg(val, ICH_LR14_EL2);
-		break;
-	case 15:
-		write_gicreg(val, ICH_LR15_EL2);
-		break;
-	}
-}
-
-static void __hyp_text save_maint_int_state(struct kvm_vcpu *vcpu, int nr_lr)
-{
-	struct vgic_v3_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v3;
-	int i;
-	bool expect_mi;
-
-	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;
-
-		expect_mi |= (!(cpu_if->vgic_lr[i] & ICH_LR_HW) &&
-			      (cpu_if->vgic_lr[i] & ICH_LR_EOI));
-	}
-
-	if (expect_mi) {
-		cpu_if->vgic_misr  = read_gicreg(ICH_MISR_EL2);
-
-		if (cpu_if->vgic_misr & ICH_MISR_EOI)
-			cpu_if->vgic_eisr = read_gicreg(ICH_EISR_EL2);
-		else
-			cpu_if->vgic_eisr = 0;
-	} else {
-		cpu_if->vgic_misr = 0;
-		cpu_if->vgic_eisr = 0;
-	}
-}
-
-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 val;
-
-	/*
-	 * Make sure stores to the GIC via the memory mapped interface
-	 * are now visible to the system register interface.
-	 */
-	if (!cpu_if->vgic_sre)
-		dsb(st);
-
-	cpu_if->vgic_vmcr  = read_gicreg(ICH_VMCR_EL2);
-
-	if (vcpu->arch.vgic_cpu.live_lrs) {
-		int i;
-		u32 max_lr_idx, 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;
-
-			if (cpu_if->vgic_elrsr & (1 << i))
-				cpu_if->vgic_lr[i] &= ~ICH_LR_STATE;
-			else
-				cpu_if->vgic_lr[i] = __gic_v3_get_lr(i);
-
-			__gic_v3_set_lr(0, i);
-		}
-
-		switch (nr_pri_bits) {
-		case 7:
-			cpu_if->vgic_ap0r[3] = read_gicreg(ICH_AP0R3_EL2);
-			cpu_if->vgic_ap0r[2] = read_gicreg(ICH_AP0R2_EL2);
-		case 6:
-			cpu_if->vgic_ap0r[1] = read_gicreg(ICH_AP0R1_EL2);
-		default:
-			cpu_if->vgic_ap0r[0] = read_gicreg(ICH_AP0R0_EL2);
-		}
-
-		switch (nr_pri_bits) {
-		case 7:
-			cpu_if->vgic_ap1r[3] = read_gicreg(ICH_AP1R3_EL2);
-			cpu_if->vgic_ap1r[2] = read_gicreg(ICH_AP1R2_EL2);
-		case 6:
-			cpu_if->vgic_ap1r[1] = read_gicreg(ICH_AP1R1_EL2);
-		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;
-		cpu_if->vgic_elrsr = 0xffff;
-		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);
-	write_gicreg(val | ICC_SRE_EL2_ENABLE, ICC_SRE_EL2);
-
-	if (!cpu_if->vgic_sre) {
-		/* Make sure ENABLE is set at EL2 before setting SRE at EL1 */
-		isb();
-		write_gicreg(1, ICC_SRE_EL1);
-	}
-}
-
-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 val;
-	u32 max_lr_idx, nr_pri_bits;
-	u16 live_lrs = 0;
-	int i;
-
-	/*
-	 * VFIQEn is RES1 if ICC_SRE_EL1.SRE is 1. This causes a
-	 * Group0 interrupt (as generated in GICv2 mode) to be
-	 * delivered as a FIQ to the guest, with potentially fatal
-	 * consequences. So we must make sure that ICC_SRE_EL1 has
-	 * been actually programmed with the value we want before
-	 * starting to mess with the rest of the GIC.
-	 */
-	if (!cpu_if->vgic_sre) {
-		write_gicreg(0, ICC_SRE_EL1);
-		isb();
-	}
-
-	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);
-	}
-
-	write_gicreg(cpu_if->vgic_vmcr, ICH_VMCR_EL2);
-
-	if (live_lrs) {
-		write_gicreg(cpu_if->vgic_hcr, ICH_HCR_EL2);
-
-		switch (nr_pri_bits) {
-		case 7:
-			write_gicreg(cpu_if->vgic_ap0r[3], ICH_AP0R3_EL2);
-			write_gicreg(cpu_if->vgic_ap0r[2], ICH_AP0R2_EL2);
-		case 6:
-			write_gicreg(cpu_if->vgic_ap0r[1], ICH_AP0R1_EL2);
-		default:
-			write_gicreg(cpu_if->vgic_ap0r[0], ICH_AP0R0_EL2);
-		}
-
-		switch (nr_pri_bits) {
-		case 7:
-			write_gicreg(cpu_if->vgic_ap1r[3], ICH_AP1R3_EL2);
-			write_gicreg(cpu_if->vgic_ap1r[2], ICH_AP1R2_EL2);
-		case 6:
-			write_gicreg(cpu_if->vgic_ap1r[1], ICH_AP1R1_EL2);
-		default:
-			write_gicreg(cpu_if->vgic_ap1r[0], ICH_AP1R0_EL2);
-		}
-
-		for (i = 0; i <= max_lr_idx; i++) {
-			if (!(live_lrs & (1 << i)))
-				continue;
-
-			__gic_v3_set_lr(cpu_if->vgic_lr[i], i);
-		}
-	}
-
-	/*
-	 * Ensures that the above will have reached the
-	 * (re)distributors. This ensure the guest will read the
-	 * correct values from the memory-mapped interface.
-	 */
-	if (!cpu_if->vgic_sre) {
-		isb();
-		dsb(sy);
-	}
-	vcpu->arch.vgic_cpu.live_lrs = live_lrs;
-
-	/*
-	 * Prevent the guest from touching the GIC system registers if
-	 * SRE isn't enabled for GICv3 emulation.
-	 */
-	write_gicreg(read_gicreg(ICC_SRE_EL2) & ~ICC_SRE_EL2_ENABLE,
-		     ICC_SRE_EL2);
-}
-
-void __hyp_text __vgic_v3_init_lrs(void)
-{
-	int max_lr_idx = vtr_to_max_lr_idx(read_gicreg(ICH_VTR_EL2));
-	int i;
-
-	for (i = 0; i <= max_lr_idx; i++)
-		__gic_v3_set_lr(0, i);
-}
-
-u64 __hyp_text __vgic_v3_get_ich_vtr_el2(void)
-{
-	return read_gicreg(ICH_VTR_EL2);
-}