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The number of GPA bits supported for a RISC-V Guest/VM is based on the MMU mode used by the G-stage translation. The KVM RISC-V will detect and use the best possible MMU mode for the G-stage in kvm_arch_init(). We add a generic VM capability KVM_CAP_VM_GPA_BITS which can be used by the KVM userspace to get the number of GPA (guest physical address) bits supported for a Guest/VM. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-and-tested-by: Atish Patra <atishp@rivosinc.com>
93 lines
1.9 KiB
C
93 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2019 Western Digital Corporation or its affiliates.
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*
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* Authors:
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* Anup Patel <anup.patel@wdc.com>
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*/
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/uaccess.h>
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#include <linux/kvm_host.h>
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const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
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KVM_GENERIC_VM_STATS()
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};
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static_assert(ARRAY_SIZE(kvm_vm_stats_desc) ==
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sizeof(struct kvm_vm_stat) / sizeof(u64));
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const struct kvm_stats_header kvm_vm_stats_header = {
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.name_size = KVM_STATS_NAME_SIZE,
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.num_desc = ARRAY_SIZE(kvm_vm_stats_desc),
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.id_offset = sizeof(struct kvm_stats_header),
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.desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE,
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.data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE +
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sizeof(kvm_vm_stats_desc),
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};
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int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
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{
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int r;
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r = kvm_riscv_stage2_alloc_pgd(kvm);
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if (r)
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return r;
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r = kvm_riscv_stage2_vmid_init(kvm);
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if (r) {
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kvm_riscv_stage2_free_pgd(kvm);
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return r;
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}
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return kvm_riscv_guest_timer_init(kvm);
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}
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void kvm_arch_destroy_vm(struct kvm *kvm)
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{
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kvm_destroy_vcpus(kvm);
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}
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int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
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{
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int r;
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switch (ext) {
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case KVM_CAP_IOEVENTFD:
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case KVM_CAP_DEVICE_CTRL:
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case KVM_CAP_USER_MEMORY:
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case KVM_CAP_SYNC_MMU:
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case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
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case KVM_CAP_ONE_REG:
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case KVM_CAP_READONLY_MEM:
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case KVM_CAP_MP_STATE:
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case KVM_CAP_IMMEDIATE_EXIT:
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r = 1;
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break;
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case KVM_CAP_NR_VCPUS:
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r = min_t(unsigned int, num_online_cpus(), KVM_MAX_VCPUS);
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break;
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case KVM_CAP_MAX_VCPUS:
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r = KVM_MAX_VCPUS;
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break;
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case KVM_CAP_NR_MEMSLOTS:
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r = KVM_USER_MEM_SLOTS;
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break;
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case KVM_CAP_VM_GPA_BITS:
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r = kvm_riscv_stage2_gpa_bits();
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break;
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default:
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r = 0;
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break;
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}
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return r;
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}
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long kvm_arch_vm_ioctl(struct file *filp,
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unsigned int ioctl, unsigned long arg)
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{
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return -EINVAL;
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}
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