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// 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>
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),
};
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(sizeof(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);
/* Enable all PV features by default */
kvm->arch.pv_features = BIT(KVM_FEATURE_IPI);
if (kvm_pvtime_supported())
kvm->arch.pv_features |= BIT(KVM_FEATURE_STEAL_TIME);
kvm->arch.gpa_size = BIT(cpu_vabits - 1);
kvm->arch.root_level = CONFIG_PGTABLE_LEVELS - 1;
kvm->arch.invalid_ptes[0] = 0;
kvm->arch.invalid_ptes[1] = (unsigned long)invalid_pte_table;
#if CONFIG_PGTABLE_LEVELS > 2
kvm->arch.invalid_ptes[2] = (unsigned long)invalid_pmd_table;
#endif
#if CONFIG_PGTABLE_LEVELS > 3
kvm->arch.invalid_ptes[3] = (unsigned long)invalid_pud_table;
#endif
for (i = 0; i <= kvm->arch.root_level; i++)
kvm->arch.pte_shifts[i] = PAGE_SHIFT + i * (PAGE_SHIFT - 3);
return 0;
}
void kvm_arch_destroy_vm(struct kvm *kvm)
{
kvm_destroy_vcpus(kvm);
free_page((unsigned long)kvm->arch.pgd);
kvm->arch.pgd = NULL;
kvfree(kvm->arch.phyid_map);
kvm->arch.phyid_map = NULL;
}
int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
{
int r;
switch (ext) {
case KVM_CAP_ONE_REG:
case KVM_CAP_ENABLE_CAP:
case KVM_CAP_READONLY_MEM:
case KVM_CAP_SYNC_MMU:
case KVM_CAP_IMMEDIATE_EXIT:
case KVM_CAP_IOEVENTFD:
case KVM_CAP_MP_STATE:
case KVM_CAP_SET_GUEST_DEBUG:
r = 1;
break;
case KVM_CAP_NR_VCPUS:
r = num_online_cpus();
break;
case KVM_CAP_MAX_VCPUS:
r = KVM_MAX_VCPUS;
break;
case KVM_CAP_MAX_VCPU_ID:
r = KVM_MAX_VCPU_IDS;
break;
case KVM_CAP_NR_MEMSLOTS:
r = KVM_USER_MEM_SLOTS;
break;
default:
r = 0;
break;
}
return r;
}
static int kvm_vm_feature_has_attr(struct kvm *kvm, struct kvm_device_attr *attr)
{
switch (attr->attr) {
case KVM_LOONGARCH_VM_FEAT_LSX:
if (cpu_has_lsx)
return 0;
return -ENXIO;
case KVM_LOONGARCH_VM_FEAT_LASX:
if (cpu_has_lasx)
return 0;
return -ENXIO;
case KVM_LOONGARCH_VM_FEAT_X86BT:
if (cpu_has_lbt_x86)
return 0;
return -ENXIO;
case KVM_LOONGARCH_VM_FEAT_ARMBT:
if (cpu_has_lbt_arm)
return 0;
return -ENXIO;
case KVM_LOONGARCH_VM_FEAT_MIPSBT:
if (cpu_has_lbt_mips)
return 0;
return -ENXIO;
case KVM_LOONGARCH_VM_FEAT_PMU:
if (cpu_has_pmp)
return 0;
return -ENXIO;
case KVM_LOONGARCH_VM_FEAT_PV_IPI:
return 0;
case KVM_LOONGARCH_VM_FEAT_PV_STEALTIME:
if (kvm_pvtime_supported())
return 0;
return -ENXIO;
default:
return -ENXIO;
}
}
static int kvm_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr)
{
switch (attr->group) {
case KVM_LOONGARCH_VM_FEAT_CTRL:
return kvm_vm_feature_has_attr(kvm, attr);
default:
return -ENXIO;
}
}
int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
{
void __user *argp = (void __user *)arg;
struct kvm *kvm = filp->private_data;
struct kvm_device_attr attr;
switch (ioctl) {
case KVM_HAS_DEVICE_ATTR:
if (copy_from_user(&attr, argp, sizeof(attr)))
return -EFAULT;
return kvm_vm_has_attr(kvm, &attr);
default:
return -ENOIOCTLCMD;
}
}
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