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Commit 06282fd2 authored by Marc Zyngier's avatar Marc Zyngier
Browse files

arm64: KVM: Implement vgic-v2 save/restore 



Implement the vgic-v2 save restore (mostly) as a direct translation
of the assembly code version.

Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
parent c76a0a66

arch/arm64/kvm/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ KVM=../../../virt/kvm 
ARM=../../../arch/arm/kvm



obj-$(CONFIG_KVM_ARM_HOST) += kvm.o

obj-$(CONFIG_KVM_ARM_HOST) += hyp/



kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o $(KVM)/eventfd.o $(KVM)/vfio.o

kvm-$(CONFIG_KVM_ARM_HOST) += $(ARM)/arm.o $(ARM)/mmu.o $(ARM)/mmio.o

arch/arm64/kvm/hyp/Makefile

0 → 100644
+5 −0
Original line number Diff line number Diff line 
#

# Makefile for Kernel-based Virtual Machine module, HYP part

#



obj-$(CONFIG_KVM_ARM_HOST) += vgic-v2-sr.o

arch/arm64/kvm/hyp/hyp.h

+3 −0
Original line number Diff line number Diff line
@@ -29,5 +29,8 @@ 
#define hyp_kern_va(v) (typeof(v))((unsigned long)(v) - HYP_PAGE_OFFSET \

						      + PAGE_OFFSET)



void __vgic_v2_save_state(struct kvm_vcpu *vcpu);

void __vgic_v2_restore_state(struct kvm_vcpu *vcpu);



#endif /* __ARM64_KVM_HYP_H__ */

arch/arm64/kvm/hyp/vgic-v2-sr.c

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+84 −0
Original line number Diff line number Diff line 
/*

 * 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.h>

#include <linux/kvm_host.h>



#include <asm/kvm_mmu.h>



#include "hyp.h"



/* 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);

	u32 eisr0, eisr1, elrsr0, elrsr1;

	int i, nr_lr;



	if (!base)

		return;



	nr_lr = vcpu->arch.vgic_cpu.nr_lr;

	cpu_if->vgic_vmcr = readl_relaxed(base + GICH_VMCR);

	cpu_if->vgic_misr = readl_relaxed(base + GICH_MISR);

	eisr0  = readl_relaxed(base + GICH_EISR0);

	elrsr0 = readl_relaxed(base + GICH_ELRSR0);

	if (unlikely(nr_lr > 32)) {

		eisr1  = readl_relaxed(base + GICH_EISR1);

		elrsr1 = readl_relaxed(base + GICH_ELRSR1);

	} else {

		eisr1 = elrsr1 = 0;

	}

#ifdef CONFIG_CPU_BIG_ENDIAN

	cpu_if->vgic_eisr  = ((u64)eisr0 << 32) | eisr1;

	cpu_if->vgic_elrsr = ((u64)elrsr0 << 32) | elrsr1;

#else

	cpu_if->vgic_eisr  = ((u64)eisr1 << 32) | eisr0;

	cpu_if->vgic_elrsr = ((u64)elrsr1 << 32) | elrsr0;

#endif

	cpu_if->vgic_apr    = readl_relaxed(base + GICH_APR);



	writel_relaxed(0, base + GICH_HCR);



	for (i = 0; i < nr_lr; i++)

		cpu_if->vgic_lr[i] = readl_relaxed(base + GICH_LR0 + (i * 4));

}



/* 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, nr_lr;



	if (!base)

		return;



	writel_relaxed(cpu_if->vgic_hcr, base + GICH_HCR);

	writel_relaxed(cpu_if->vgic_vmcr, base + GICH_VMCR);

	writel_relaxed(cpu_if->vgic_apr, base + GICH_APR);



	nr_lr = vcpu->arch.vgic_cpu.nr_lr;

	for (i = 0; i < nr_lr; i++)

		writel_relaxed(cpu_if->vgic_lr[i], base + GICH_LR0 + (i * 4));

}