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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2020 - Google LLC
* Author: Quentin Perret <qperret@google.com>
*/
#include <linux/kvm_host.h>
#include <linux/memblock.h>
#include <linux/mutex.h>
#include <linux/sort.h>
#include <asm/kvm_pkvm.h>
#include "hyp_constants.h"
static struct memblock_region *hyp_memory = kvm_nvhe_sym(hyp_memory);
static unsigned int *hyp_memblock_nr_ptr = &kvm_nvhe_sym(hyp_memblock_nr);
phys_addr_t hyp_mem_base;
phys_addr_t hyp_mem_size;
static int cmp_hyp_memblock(const void *p1, const void *p2)
{
const struct memblock_region *r1 = p1;
const struct memblock_region *r2 = p2;
return r1->base < r2->base ? -1 : (r1->base > r2->base);
}
static void __init sort_memblock_regions(void)
{
sort(hyp_memory,
*hyp_memblock_nr_ptr,
sizeof(struct memblock_region),
cmp_hyp_memblock,
NULL);
}
static int __init register_memblock_regions(void)
{
struct memblock_region *reg;
for_each_mem_region(reg) {
if (*hyp_memblock_nr_ptr >= HYP_MEMBLOCK_REGIONS)
return -ENOMEM;
hyp_memory[*hyp_memblock_nr_ptr] = *reg;
(*hyp_memblock_nr_ptr)++;
}
sort_memblock_regions();
return 0;
}
void __init kvm_hyp_reserve(void)
{
u64 hyp_mem_pages = 0;
int ret;
if (!is_hyp_mode_available() || is_kernel_in_hyp_mode())
return;
if (kvm_get_mode() != KVM_MODE_PROTECTED)
return;
ret = register_memblock_regions();
if (ret) {
*hyp_memblock_nr_ptr = 0;
kvm_err("Failed to register hyp memblocks: %d\n", ret);
return;
}
hyp_mem_pages += hyp_s1_pgtable_pages();
hyp_mem_pages += host_s2_pgtable_pages();
hyp_mem_pages += hyp_vm_table_pages();
hyp_mem_pages += hyp_vmemmap_pages(STRUCT_HYP_PAGE_SIZE);
/*
* Try to allocate a PMD-aligned region to reduce TLB pressure once
* this is unmapped from the host stage-2, and fallback to PAGE_SIZE.
*/
hyp_mem_size = hyp_mem_pages << PAGE_SHIFT;
hyp_mem_base = memblock_phys_alloc(ALIGN(hyp_mem_size, PMD_SIZE),
PMD_SIZE);
if (!hyp_mem_base)
hyp_mem_base = memblock_phys_alloc(hyp_mem_size, PAGE_SIZE);
else
hyp_mem_size = ALIGN(hyp_mem_size, PMD_SIZE);
if (!hyp_mem_base) {
kvm_err("Failed to reserve hyp memory\n");
return;
}
kvm_info("Reserved %lld MiB at 0x%llx\n", hyp_mem_size >> 20,
hyp_mem_base);
}
/*
* Allocates and donates memory for hypervisor VM structs at EL2.
*
* Allocates space for the VM state, which includes the hyp vm as well as
* the hyp vcpus.
*
* Stores an opaque handler in the kvm struct for future reference.
*
* Return 0 on success, negative error code on failure.
*/
static int __pkvm_create_hyp_vm(struct kvm *host_kvm)
{
size_t pgd_sz, hyp_vm_sz, hyp_vcpu_sz;
struct kvm_vcpu *host_vcpu;
pkvm_handle_t handle;
void *pgd, *hyp_vm;
unsigned long idx;
int ret;
if (host_kvm->created_vcpus < 1)
return -EINVAL;
pgd_sz = kvm_pgtable_stage2_pgd_size(host_kvm->arch.vtcr);
/*
* The PGD pages will be reclaimed using a hyp_memcache which implies
* page granularity. So, use alloc_pages_exact() to get individual
* refcounts.
*/
pgd = alloc_pages_exact(pgd_sz, GFP_KERNEL_ACCOUNT);
if (!pgd)
return -ENOMEM;
/* Allocate memory to donate to hyp for vm and vcpu pointers. */
hyp_vm_sz = PAGE_ALIGN(size_add(PKVM_HYP_VM_SIZE,
size_mul(sizeof(void *),
host_kvm->created_vcpus)));
hyp_vm = alloc_pages_exact(hyp_vm_sz, GFP_KERNEL_ACCOUNT);
if (!hyp_vm) {
ret = -ENOMEM;
goto free_pgd;
}
/* Donate the VM memory to hyp and let hyp initialize it. */
ret = kvm_call_hyp_nvhe(__pkvm_init_vm, host_kvm, hyp_vm, pgd);
if (ret < 0)
goto free_vm;
handle = ret;
host_kvm->arch.pkvm.handle = handle;
/* Donate memory for the vcpus at hyp and initialize it. */
hyp_vcpu_sz = PAGE_ALIGN(PKVM_HYP_VCPU_SIZE);
kvm_for_each_vcpu(idx, host_vcpu, host_kvm) {
void *hyp_vcpu;
/* Indexing of the vcpus to be sequential starting at 0. */
if (WARN_ON(host_vcpu->vcpu_idx != idx)) {
ret = -EINVAL;
goto destroy_vm;
}
hyp_vcpu = alloc_pages_exact(hyp_vcpu_sz, GFP_KERNEL_ACCOUNT);
if (!hyp_vcpu) {
ret = -ENOMEM;
goto destroy_vm;
}
ret = kvm_call_hyp_nvhe(__pkvm_init_vcpu, handle, host_vcpu,
hyp_vcpu);
if (ret) {
free_pages_exact(hyp_vcpu, hyp_vcpu_sz);
goto destroy_vm;
}
}
return 0;
destroy_vm:
pkvm_destroy_hyp_vm(host_kvm);
return ret;
free_vm:
free_pages_exact(hyp_vm, hyp_vm_sz);
free_pgd:
free_pages_exact(pgd, pgd_sz);
return ret;
}
int pkvm_create_hyp_vm(struct kvm *host_kvm)
{
int ret = 0;
mutex_lock(&host_kvm->lock);
if (!host_kvm->arch.pkvm.handle)
ret = __pkvm_create_hyp_vm(host_kvm);
mutex_unlock(&host_kvm->lock);
return ret;
}
void pkvm_destroy_hyp_vm(struct kvm *host_kvm)
{
if (host_kvm->arch.pkvm.handle) {
WARN_ON(kvm_call_hyp_nvhe(__pkvm_teardown_vm,
host_kvm->arch.pkvm.handle));
}
host_kvm->arch.pkvm.handle = 0;
free_hyp_memcache(&host_kvm->arch.pkvm.teardown_mc);
}
int pkvm_init_host_vm(struct kvm *host_kvm)
{
mutex_init(&host_kvm->lock);
return 0;
}
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