arch/loongarch/kvm/vm.c

Source file repositories/reference/linux-study-clean/arch/loongarch/kvm/vm.c

File Facts

System
Linux kernel
Corpus path
arch/loongarch/kvm/vm.c
Extension
.c
Size
5592 bytes
Lines
213
Domain
Architecture Layer
Bucket
arch/loongarch
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
 */

#include <linux/kvm_host.h>
#include <asm/kvm_mmu.h>
#include <asm/kvm_vcpu.h>
#include <asm/kvm_csr.h>
#include <asm/kvm_eiointc.h>
#include <asm/kvm_pch_pic.h>

const struct kvm_stats_desc kvm_vm_stats_desc[] = {
	KVM_GENERIC_VM_STATS(),
	STATS_DESC_ICOUNTER(VM, pages),
	STATS_DESC_ICOUNTER(VM, hugepages),
};

const struct kvm_stats_header kvm_vm_stats_header = {
	.name_size = KVM_STATS_NAME_SIZE,
	.num_desc = ARRAY_SIZE(kvm_vm_stats_desc),
	.id_offset =  sizeof(struct kvm_stats_header),
	.desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE,
	.data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE +
					sizeof(kvm_vm_stats_desc),
};

static void kvm_vm_init_features(struct kvm *kvm)
{
	unsigned long val;

	if (cpu_has_lsx)
		kvm->arch.kvm_features |= BIT(KVM_LOONGARCH_VM_FEAT_LSX);
	if (cpu_has_lasx)
		kvm->arch.kvm_features |= BIT(KVM_LOONGARCH_VM_FEAT_LASX);
	if (cpu_has_lbt_x86)
		kvm->arch.kvm_features |= BIT(KVM_LOONGARCH_VM_FEAT_X86BT);
	if (cpu_has_lbt_arm)
		kvm->arch.kvm_features |= BIT(KVM_LOONGARCH_VM_FEAT_ARMBT);
	if (cpu_has_lbt_mips)
		kvm->arch.kvm_features |= BIT(KVM_LOONGARCH_VM_FEAT_MIPSBT);
	if (cpu_has_ptw)
		kvm->arch.kvm_features |= BIT(KVM_LOONGARCH_VM_FEAT_PTW);
	if (cpu_has_msgint)
		kvm->arch.kvm_features |= BIT(KVM_LOONGARCH_VM_FEAT_MSGINT);

	val = read_csr_gcfg();
	if (val & CSR_GCFG_GPMP)
		kvm->arch.kvm_features |= BIT(KVM_LOONGARCH_VM_FEAT_PMU);

	/* Enable all PV features by default */
	kvm->arch.pv_features |= BIT(KVM_FEATURE_IPI);
	kvm->arch.kvm_features |= BIT(KVM_LOONGARCH_VM_FEAT_PV_IPI);
	if (kvm_pvtime_supported()) {
		kvm->arch.pv_features |= BIT(KVM_FEATURE_PREEMPT);
		kvm->arch.pv_features |= BIT(KVM_FEATURE_STEAL_TIME);
		kvm->arch.kvm_features |= BIT(KVM_LOONGARCH_VM_FEAT_PV_PREEMPT);
		kvm->arch.kvm_features |= BIT(KVM_LOONGARCH_VM_FEAT_PV_STEALTIME);
	}
}

int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
{
	int i;

	/* Allocate page table to map GPA -> RPA */
	kvm->arch.pgd = kvm_pgd_alloc();
	if (!kvm->arch.pgd)
		return -ENOMEM;

	kvm->arch.phyid_map = kvzalloc_obj(struct kvm_phyid_map,
					   GFP_KERNEL_ACCOUNT);
	if (!kvm->arch.phyid_map) {
		free_page((unsigned long)kvm->arch.pgd);
		kvm->arch.pgd = NULL;
		return -ENOMEM;
	}
	spin_lock_init(&kvm->arch.phyid_map_lock);

	kvm_init_vmcs(kvm);
	kvm_vm_init_features(kvm);

	/*
	 * cpu_vabits means user address space only (a half of total).
	 * GPA size of VM is the same with the size of user address space.
	 */
	kvm->arch.gpa_size = BIT(cpu_vabits);
	kvm->arch.root_level = CONFIG_PGTABLE_LEVELS - 1;
	kvm->arch.invalid_ptes[0] = 0;
	kvm->arch.invalid_ptes[1] = (unsigned long)invalid_pte_table;

Annotation

Implementation Notes