virt/kvm/arm/hyp/vgic-v3-sr.c - SHIFTPHONES/mainline/linux - Gitiles

 /*
  * 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)
 {
 	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 < used_lrs; i++) {
 		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 used_lrs = vcpu->arch.vgic_cpu.used_lrs;
 	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);

 	if (used_lrs) {
 		int i;
 		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);
 		nr_pri_bits = vtr_to_nr_pri_bits(val);

 		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
 				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);
 		}
 	} 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 used_lrs = vcpu->arch.vgic_cpu.used_lrs;
 	u64 val;
 	u32 nr_pri_bits;
 	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);
 	nr_pri_bits = vtr_to_nr_pri_bits(val);

 	if (used_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 < used_lrs; i++)
 			__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);
 	}

 	/*
 	 * 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);
 }

 u64 __hyp_text __vgic_v3_read_vmcr(void)
 {
 	return read_gicreg(ICH_VMCR_EL2);
 }

 void __hyp_text __vgic_v3_write_vmcr(u32 vmcr)
 {
 	write_gicreg(vmcr, ICH_VMCR_EL2);
 }
	/*
	* 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)
	{
	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 < used_lrs; i++) {
	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 used_lrs = vcpu->arch.vgic_cpu.used_lrs;
	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);

	if (used_lrs) {
	int i;
	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);
	nr_pri_bits = vtr_to_nr_pri_bits(val);

	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
	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);
	}
	} 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 used_lrs = vcpu->arch.vgic_cpu.used_lrs;
	u64 val;
	u32 nr_pri_bits;
	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);
	nr_pri_bits = vtr_to_nr_pri_bits(val);

	if (used_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 < used_lrs; i++)
	__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);
	}

	/*
	* 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);
	}

	u64 __hyp_text __vgic_v3_read_vmcr(void)
	{
	return read_gicreg(ICH_VMCR_EL2);
	}

	void __hyp_text __vgic_v3_write_vmcr(u32 vmcr)
	{
	write_gicreg(vmcr, ICH_VMCR_EL2);
	}