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acrn-hypervisor/hypervisor/arch/x86/guest/ve820.c

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/*
* Copyright (C) 2019-2022 Intel Corporation.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <asm/e820.h>
#include <asm/mmu.h>
#include <asm/guest/vm.h>
#include <asm/guest/ept.h>
#include <reloc.h>
#include <vacpi.h>
#include <logmsg.h>
#include <asm/rtcm.h>
#include <ptdev.h>
#define ENTRY_GPA_L 2U
#define ENTRY_GPA_HI 8U
static struct e820_entry service_vm_e820[E820_MAX_ENTRIES];
static struct e820_entry pre_vm_e820[PRE_VM_NUM][E820_MAX_ENTRIES];
uint64_t find_space_from_ve820(struct acrn_vm *vm, uint32_t size, uint64_t min_addr, uint64_t max_addr)
{
int32_t i;
uint64_t gpa = INVALID_GPA;
uint64_t round_min_addr = round_page_up(min_addr);
uint64_t round_max_addr = round_page_down(max_addr);
uint32_t round_size = round_page_up(size);
for (i = (int32_t)(vm->e820_entry_num - 1U); i >= 0; i--) {
struct e820_entry *entry = vm->e820_entries + i;
uint64_t start, end, length;
start = round_page_up(entry->baseaddr);
end = round_page_down(entry->baseaddr + entry->length);
length = (end > start) ? (end - start) : 0UL;
if ((entry->type == E820_TYPE_RAM) && (length >= (uint64_t)round_size)
&& (end > round_min_addr) && (start < round_max_addr)) {
if (((start >= min_addr) && ((start + round_size) <= min(end, round_max_addr)))
|| ((start < min_addr) && ((min_addr + round_size) <= min(end, round_max_addr)))) {
gpa = (end > round_max_addr) ? (round_max_addr - round_size) : (end - round_size);
break;
}
}
}
return gpa;
}
/* a sorted VM e820 table is critical for memory allocation or slot location,
* for example, put ramdisk at the end of TOLUD(Top of LOW Usable DRAM) and
* put kernel at its begining so that provide largest load capicity for them.
*/
static void sort_vm_e820(struct acrn_vm *vm)
{
uint32_t i,j;
struct e820_entry tmp_entry;
/* Bubble sort */
for (i = 0U; i < (vm->e820_entry_num - 1U); i++) {
for (j = 0U; j < (vm->e820_entry_num - i - 1U); j++) {
if (vm->e820_entries[j].baseaddr > vm->e820_entries[j + 1U].baseaddr) {
tmp_entry = vm->e820_entries[j];
vm->e820_entries[j] = vm->e820_entries[j + 1U];
vm->e820_entries[j + 1U] = tmp_entry;
}
}
}
}
static void filter_mem_from_service_vm_e820(struct acrn_vm *vm, uint64_t start_pa, uint64_t end_pa)
{
uint32_t i;
uint64_t entry_start;
uint64_t entry_end;
uint32_t entries_count = vm->e820_entry_num;
struct e820_entry *entry, new_entry = {0};
for (i = 0U; i < entries_count; i++) {
entry = &service_vm_e820[i];
entry_start = entry->baseaddr;
entry_end = entry->baseaddr + entry->length;
/* No need handle in these cases*/
if ((entry->type != E820_TYPE_RAM) || (entry_end <= start_pa) || (entry_start >= end_pa)) {
continue;
}
/* filter out the specific memory and adjust length of this entry*/
if ((entry_start < start_pa) && (entry_end <= end_pa)) {
entry->length = start_pa - entry_start;
continue;
}
/* filter out the specific memory and need to create a new entry*/
if ((entry_start < start_pa) && (entry_end > end_pa)) {
entry->length = start_pa - entry_start;
new_entry.baseaddr = end_pa;
new_entry.length = entry_end - end_pa;
new_entry.type = E820_TYPE_RAM;
continue;
}
/* This entry is within the range of specific memory
* change to E820_TYPE_RESERVED
*/
if ((entry_start >= start_pa) && (entry_end <= end_pa)) {
entry->type = E820_TYPE_RESERVED;
continue;
}
if ((entry_start >= start_pa) && (entry_start < end_pa) && (entry_end > end_pa)) {
entry->baseaddr = end_pa;
entry->length = entry_end - end_pa;
continue;
}
}
if (new_entry.length > 0UL) {
entries_count++;
ASSERT(entries_count <= E820_MAX_ENTRIES, "e820 entry overflow");
entry = &service_vm_e820[entries_count - 1U];
entry->baseaddr = new_entry.baseaddr;
entry->length = new_entry.length;
entry->type = new_entry.type;
vm->e820_entry_num = entries_count;
}
}
/**
* before boot Service VM, call it to hide HV and prelaunched VM memory in e820 table from Service VM
*
* @pre vm != NULL
*/
void create_service_vm_e820(struct acrn_vm *vm)
{
uint16_t vm_id;
uint32_t i;
uint64_t hv_start_pa = hva2hpa((void *)(get_hv_image_base()));
uint64_t hv_end_pa = hv_start_pa + get_hv_ram_size();
uint32_t entries_count = get_e820_entries_count();
struct acrn_vm_config *service_vm_config = get_vm_config(vm->vm_id);
(void)memcpy_s((void *)service_vm_e820, entries_count * sizeof(struct e820_entry),
(const void *)get_e820_entry(), entries_count * sizeof(struct e820_entry));
vm->e820_entry_num = entries_count;
vm->e820_entries = service_vm_e820;
/* filter out hv memory from e820 table */
filter_mem_from_service_vm_e820(vm, hv_start_pa, hv_end_pa);
/* filter out prelaunched vm memory from e820 table */
for (vm_id = 0U; vm_id < CONFIG_MAX_VM_NUM; vm_id++) {
struct acrn_vm_config *vm_config = get_vm_config(vm_id);
if (vm_config->load_order == PRE_LAUNCHED_VM) {
for (i = 0; i < vm_config->memory.region_num; i++) {
filter_mem_from_service_vm_e820(vm, vm_config->memory.host_regions[i].start_hpa,
vm_config->memory.host_regions[i].start_hpa
+ vm_config->memory.host_regions[i].size_hpa);
}
}
}
for (i = 0U; i < vm->e820_entry_num; i++) {
struct e820_entry *entry = &service_vm_e820[i];
if (entry->type == E820_TYPE_RAM) {
service_vm_config->memory.size += entry->length;
}
}
sort_vm_e820(vm);
}
static const struct e820_entry pre_ve820_template[E820_MAX_ENTRIES] = {
{ /* usable RAM under 1MB */
.baseaddr = 0x0UL,
.length = 0xA0000UL, /* 640KB */
.type = E820_TYPE_RAM
},
{ /* Video/BIOS extentions */
.baseaddr = 0xA0000UL,
.length = 0x60000UL, /* 384KB */
.type = E820_TYPE_RESERVED
},
{ /* hpa1_low */
.baseaddr = MEM_1M, /* 1MB */
.length = PRE_RTVM_SW_SRAM_BASE_GPA - MEM_1M,
.type = E820_TYPE_RAM
},
{ /* Software SRAM */
.baseaddr = PRE_RTVM_SW_SRAM_BASE_GPA,
.length = PRE_RTVM_SW_SRAM_MAX_SIZE,
.type = E820_TYPE_RESERVED
},
{ /* GPU OpRegion for pre-launched VM */
.baseaddr = GPU_OPREGION_GPA,
.length = GPU_OPREGION_SIZE,
.type = E820_TYPE_RESERVED
},
{ /* ACPI Reclaim */
.baseaddr = VIRT_ACPI_DATA_ADDR,/* consecutive from 0x7fe00000UL */
.length = VIRT_ACPI_DATA_LEN,
.type = E820_TYPE_ACPI_RECLAIM
},
{ /* ACPI NVS */
.baseaddr = VIRT_ACPI_NVS_ADDR, /* consecutive after ACPI Reclaim */
.length = VIRT_ACPI_NVS_LEN,
.type = E820_TYPE_ACPI_NVS
},
{ /* 32bit PCI hole */
.baseaddr = 0x80000000UL, /* 2048MB */
.length = MEM_2G,
.type = E820_TYPE_RESERVED
},
};
static inline uint64_t calculate_memory_size(struct vm_hpa_regions *regions, uint64_t num)
{
uint64_t i;
uint64_t size = 0;
for(i = 0; i < num; i++) {
size += regions[i].size_hpa;
}
return size;
}
/**
* @pre entry != NULL
*/
static inline uint64_t add_ram_entry(struct e820_entry *entry, uint64_t gpa, uint64_t length)
{
entry->baseaddr = gpa;
entry->length = length;
entry->type = E820_TYPE_RAM;
return round_pde_up(entry->baseaddr + entry->length);
}
/**
* @pre vm != NULL
*
* ve820 layout for pre-launched VM:
*
* entry0: usable under 1MB
* entry1: reserved for MP Table/ACPI RSDP from 0xf0000 to 0xfffff
* entry2: hpa1_low
* entry3: reserved, Software SRAM segment, from 0x7f5fb000 to 0x7fdfb000(8M)
* this address is also hard-coded in offline tool to generate guest's RTCT/PTCT table
* entry4: gpu_opregion (0x5000)
* entry5: ACPI Reclaim from 0x7fe00000 to 0x7fefffff (1M)
* entry6: ACPI NVS from 0x7ff00000 to 0x7fffffff (1M)
* Currently this is used by:
* a) first 64k reserved
* if CONFIG_SECURITY_VM_FIXUP enabled,
* b) TPM2 event log region (if platform supports TPM2 eventlog) from 0x7ffb0000 to 0x7fffffff
* c) SMBIOS table in between 64k and 0xb0000
* entry7: reserved for 32bit PCI hole from 0x80000000 to 0xffffffff
* (entry8): usable for
* a) hpa1_hi, if hpa1 > 2GB - PRE_RTVM_SW_SRAM_MAX_SIZE
* b) hpa2, if (hpa1 + hpa2) < 2GB - PRE_RTVM_SW_SRAM_MAX_SIZE
* c) hpa2_lo,
* if hpa1 < 2GB - PRE_RTVM_SW_SRAM_MAX_SIZE and (hpa1 + hpa2) > 2GB - PRE_RTVM_SW_SRAM_MAX_SIZE
* (entry9): usable for
* a) hpa2, if hpa1 > 2GB - PRE_RTVM_SW_SRAM_MAX_SIZE
* b) hpa2_hi,
* if hpa1 < 2GB - PRE_RTVM_SW_SRAM_MAX_SIZE and (hpa1 + hpa2) > 2GB - PRE_RTVM_SW_SRAM_MAX_SIZE
*/
/*
The actual memory mapping under 2G looks like below:
|<--1M-->|
|<-----hpa1_low--->|
|<---Non-mapped hole (if there is)-->|
|<---Software SRAM--->|
|<-----gpu_opregion--->|
|<---(1M + 1M) ACPI NVS/DATA--->|
*/
void create_prelaunched_vm_e820(struct acrn_vm *vm)
{
struct acrn_vm_config *vm_config = get_vm_config(vm->vm_id);
uint64_t gpa_start = 0x100000000UL;
uint64_t gpa_hi_size;
uint64_t lowmem_max_length = MEM_2G - PRE_RTVM_SW_SRAM_MAX_SIZE - GPU_OPREGION_SIZE;
uint32_t entry_idx = ENTRY_GPA_HI;
uint64_t memory_size = calculate_memory_size(vm_config->memory.host_regions, vm_config->memory.region_num);
vm->e820_entries = pre_vm_e820[vm->vm_id];
(void)memcpy_s((void *)vm->e820_entries, E820_MAX_ENTRIES * sizeof(struct e820_entry),
(const void *)pre_ve820_template, E820_MAX_ENTRIES * sizeof(struct e820_entry));
if (memory_size > lowmem_max_length) {
gpa_hi_size = memory_size - lowmem_max_length;
add_ram_entry((vm->e820_entries + entry_idx), gpa_start, gpa_hi_size);
entry_idx++;
} else {
/* need to revise length of hpa1 entry to its actual size, excluding size of used space */
vm->e820_entries[ENTRY_GPA_L].length = memory_size - MEM_1M - VIRT_ACPI_DATA_LEN - VIRT_ACPI_NVS_LEN;
}
vm->e820_entry_num = entry_idx;
sort_vm_e820(vm);
}
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