This will allow us to centralize the registration of the cpus.c module accelerator operations (in accel/accel-softmmu.c), and trigger it automatically using object hierarchy lookup from the new accel_init_interfaces() initialization step, depending just on which accelerators are available in the code. Rename all tcg-cpus.c, kvm-cpus.c, etc to tcg-accel-ops.c, kvm-accel-ops.c, etc, matching the object type names. Signed-off-by: Claudio Fontana <cfontana@suse.de> Message-Id: <20210204163931.7358-18-cfontana@suse.de> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
322 lines
11 KiB
C
322 lines
11 KiB
C
/*
|
|
* HAX memory mapping operations
|
|
*
|
|
* Copyright (c) 2015-16 Intel Corporation
|
|
* Copyright 2016 Google, Inc.
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2. See
|
|
* the COPYING file in the top-level directory.
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
#include "cpu.h"
|
|
#include "exec/address-spaces.h"
|
|
#include "qemu/error-report.h"
|
|
|
|
#include "hax-accel-ops.h"
|
|
#include "qemu/queue.h"
|
|
|
|
#define DEBUG_HAX_MEM 0
|
|
|
|
#define DPRINTF(fmt, ...) \
|
|
do { \
|
|
if (DEBUG_HAX_MEM) { \
|
|
fprintf(stdout, fmt, ## __VA_ARGS__); \
|
|
} \
|
|
} while (0)
|
|
|
|
/**
|
|
* HAXMapping: describes a pending guest physical memory mapping
|
|
*
|
|
* @start_pa: a guest physical address marking the start of the region; must be
|
|
* page-aligned
|
|
* @size: a guest physical address marking the end of the region; must be
|
|
* page-aligned
|
|
* @host_va: the host virtual address of the start of the mapping
|
|
* @flags: mapping parameters e.g. HAX_RAM_INFO_ROM or HAX_RAM_INFO_INVALID
|
|
* @entry: additional fields for linking #HAXMapping instances together
|
|
*/
|
|
typedef struct HAXMapping {
|
|
uint64_t start_pa;
|
|
uint32_t size;
|
|
uint64_t host_va;
|
|
int flags;
|
|
QTAILQ_ENTRY(HAXMapping) entry;
|
|
} HAXMapping;
|
|
|
|
/*
|
|
* A doubly-linked list (actually a tail queue) of the pending page mappings
|
|
* for the ongoing memory transaction.
|
|
*
|
|
* It is used to optimize the number of page mapping updates done through the
|
|
* kernel module. For example, it's effective when a driver is digging an MMIO
|
|
* hole inside an existing memory mapping. It will get a deletion of the whole
|
|
* region, then the addition of the 2 remaining RAM areas around the hole and
|
|
* finally the memory transaction commit. During the commit, it will effectively
|
|
* send to the kernel only the removal of the pages from the MMIO hole after
|
|
* having computed locally the result of the deletion and additions.
|
|
*/
|
|
static QTAILQ_HEAD(, HAXMapping) mappings =
|
|
QTAILQ_HEAD_INITIALIZER(mappings);
|
|
|
|
/**
|
|
* hax_mapping_dump_list: dumps @mappings to stdout (for debugging)
|
|
*/
|
|
static void hax_mapping_dump_list(void)
|
|
{
|
|
HAXMapping *entry;
|
|
|
|
DPRINTF("%s updates:\n", __func__);
|
|
QTAILQ_FOREACH(entry, &mappings, entry) {
|
|
DPRINTF("\t%c 0x%016" PRIx64 "->0x%016" PRIx64 " VA 0x%016" PRIx64
|
|
"%s\n", entry->flags & HAX_RAM_INFO_INVALID ? '-' : '+',
|
|
entry->start_pa, entry->start_pa + entry->size, entry->host_va,
|
|
entry->flags & HAX_RAM_INFO_ROM ? " ROM" : "");
|
|
}
|
|
}
|
|
|
|
static void hax_insert_mapping_before(HAXMapping *next, uint64_t start_pa,
|
|
uint32_t size, uint64_t host_va,
|
|
uint8_t flags)
|
|
{
|
|
HAXMapping *entry;
|
|
|
|
entry = g_malloc0(sizeof(*entry));
|
|
entry->start_pa = start_pa;
|
|
entry->size = size;
|
|
entry->host_va = host_va;
|
|
entry->flags = flags;
|
|
if (!next) {
|
|
QTAILQ_INSERT_TAIL(&mappings, entry, entry);
|
|
} else {
|
|
QTAILQ_INSERT_BEFORE(next, entry, entry);
|
|
}
|
|
}
|
|
|
|
static bool hax_mapping_is_opposite(HAXMapping *entry, uint64_t host_va,
|
|
uint8_t flags)
|
|
{
|
|
/* removed then added without change for the read-only flag */
|
|
bool nop_flags = (entry->flags ^ flags) == HAX_RAM_INFO_INVALID;
|
|
|
|
return (entry->host_va == host_va) && nop_flags;
|
|
}
|
|
|
|
static void hax_update_mapping(uint64_t start_pa, uint32_t size,
|
|
uint64_t host_va, uint8_t flags)
|
|
{
|
|
uint64_t end_pa = start_pa + size;
|
|
HAXMapping *entry, *next;
|
|
|
|
QTAILQ_FOREACH_SAFE(entry, &mappings, entry, next) {
|
|
uint32_t chunk_sz;
|
|
if (start_pa >= entry->start_pa + entry->size) {
|
|
continue;
|
|
}
|
|
if (start_pa < entry->start_pa) {
|
|
chunk_sz = end_pa <= entry->start_pa ? size
|
|
: entry->start_pa - start_pa;
|
|
hax_insert_mapping_before(entry, start_pa, chunk_sz,
|
|
host_va, flags);
|
|
start_pa += chunk_sz;
|
|
host_va += chunk_sz;
|
|
size -= chunk_sz;
|
|
} else if (start_pa > entry->start_pa) {
|
|
/* split the existing chunk at start_pa */
|
|
chunk_sz = start_pa - entry->start_pa;
|
|
hax_insert_mapping_before(entry, entry->start_pa, chunk_sz,
|
|
entry->host_va, entry->flags);
|
|
entry->start_pa += chunk_sz;
|
|
entry->host_va += chunk_sz;
|
|
entry->size -= chunk_sz;
|
|
}
|
|
/* now start_pa == entry->start_pa */
|
|
chunk_sz = MIN(size, entry->size);
|
|
if (chunk_sz) {
|
|
bool nop = hax_mapping_is_opposite(entry, host_va, flags);
|
|
bool partial = chunk_sz < entry->size;
|
|
if (partial) {
|
|
/* remove the beginning of the existing chunk */
|
|
entry->start_pa += chunk_sz;
|
|
entry->host_va += chunk_sz;
|
|
entry->size -= chunk_sz;
|
|
if (!nop) {
|
|
hax_insert_mapping_before(entry, start_pa, chunk_sz,
|
|
host_va, flags);
|
|
}
|
|
} else { /* affects the full mapping entry */
|
|
if (nop) { /* no change to this mapping, remove it */
|
|
QTAILQ_REMOVE(&mappings, entry, entry);
|
|
g_free(entry);
|
|
} else { /* update mapping properties */
|
|
entry->host_va = host_va;
|
|
entry->flags = flags;
|
|
}
|
|
}
|
|
start_pa += chunk_sz;
|
|
host_va += chunk_sz;
|
|
size -= chunk_sz;
|
|
}
|
|
if (!size) { /* we are done */
|
|
break;
|
|
}
|
|
}
|
|
if (size) { /* add the leftover */
|
|
hax_insert_mapping_before(NULL, start_pa, size, host_va, flags);
|
|
}
|
|
}
|
|
|
|
static void hax_process_section(MemoryRegionSection *section, uint8_t flags)
|
|
{
|
|
MemoryRegion *mr = section->mr;
|
|
hwaddr start_pa = section->offset_within_address_space;
|
|
ram_addr_t size = int128_get64(section->size);
|
|
unsigned int delta;
|
|
uint64_t host_va;
|
|
uint32_t max_mapping_size;
|
|
|
|
/* We only care about RAM and ROM regions */
|
|
if (!memory_region_is_ram(mr)) {
|
|
if (memory_region_is_romd(mr)) {
|
|
/* HAXM kernel module does not support ROMD yet */
|
|
warn_report("Ignoring ROMD region 0x%016" PRIx64 "->0x%016" PRIx64,
|
|
start_pa, start_pa + size);
|
|
}
|
|
return;
|
|
}
|
|
|
|
/* Adjust start_pa and size so that they are page-aligned. (Cf
|
|
* kvm_set_phys_mem() in kvm-all.c).
|
|
*/
|
|
delta = qemu_real_host_page_size - (start_pa & ~qemu_real_host_page_mask);
|
|
delta &= ~qemu_real_host_page_mask;
|
|
if (delta > size) {
|
|
return;
|
|
}
|
|
start_pa += delta;
|
|
size -= delta;
|
|
size &= qemu_real_host_page_mask;
|
|
if (!size || (start_pa & ~qemu_real_host_page_mask)) {
|
|
return;
|
|
}
|
|
|
|
host_va = (uintptr_t)memory_region_get_ram_ptr(mr)
|
|
+ section->offset_within_region + delta;
|
|
if (memory_region_is_rom(section->mr)) {
|
|
flags |= HAX_RAM_INFO_ROM;
|
|
}
|
|
|
|
/*
|
|
* The kernel module interface uses 32-bit sizes:
|
|
* https://github.com/intel/haxm/blob/master/API.md#hax_vm_ioctl_set_ram
|
|
*
|
|
* If the mapping size is longer than 32 bits, we can't process it in one
|
|
* call into the kernel. Instead, we split the mapping into smaller ones,
|
|
* and call hax_update_mapping() on each.
|
|
*/
|
|
max_mapping_size = UINT32_MAX & qemu_real_host_page_mask;
|
|
while (size > max_mapping_size) {
|
|
hax_update_mapping(start_pa, max_mapping_size, host_va, flags);
|
|
start_pa += max_mapping_size;
|
|
size -= max_mapping_size;
|
|
host_va += max_mapping_size;
|
|
}
|
|
/* Now size <= max_mapping_size */
|
|
hax_update_mapping(start_pa, (uint32_t)size, host_va, flags);
|
|
}
|
|
|
|
static void hax_region_add(MemoryListener *listener,
|
|
MemoryRegionSection *section)
|
|
{
|
|
memory_region_ref(section->mr);
|
|
hax_process_section(section, 0);
|
|
}
|
|
|
|
static void hax_region_del(MemoryListener *listener,
|
|
MemoryRegionSection *section)
|
|
{
|
|
hax_process_section(section, HAX_RAM_INFO_INVALID);
|
|
memory_region_unref(section->mr);
|
|
}
|
|
|
|
static void hax_transaction_begin(MemoryListener *listener)
|
|
{
|
|
g_assert(QTAILQ_EMPTY(&mappings));
|
|
}
|
|
|
|
static void hax_transaction_commit(MemoryListener *listener)
|
|
{
|
|
if (!QTAILQ_EMPTY(&mappings)) {
|
|
HAXMapping *entry, *next;
|
|
|
|
if (DEBUG_HAX_MEM) {
|
|
hax_mapping_dump_list();
|
|
}
|
|
QTAILQ_FOREACH_SAFE(entry, &mappings, entry, next) {
|
|
if (entry->flags & HAX_RAM_INFO_INVALID) {
|
|
/* for unmapping, put the values expected by the kernel */
|
|
entry->flags = HAX_RAM_INFO_INVALID;
|
|
entry->host_va = 0;
|
|
}
|
|
if (hax_set_ram(entry->start_pa, entry->size,
|
|
entry->host_va, entry->flags)) {
|
|
fprintf(stderr, "%s: Failed mapping @0x%016" PRIx64 "+0x%"
|
|
PRIx32 " flags %02x\n", __func__, entry->start_pa,
|
|
entry->size, entry->flags);
|
|
}
|
|
QTAILQ_REMOVE(&mappings, entry, entry);
|
|
g_free(entry);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* currently we fake the dirty bitmap sync, always dirty */
|
|
static void hax_log_sync(MemoryListener *listener,
|
|
MemoryRegionSection *section)
|
|
{
|
|
MemoryRegion *mr = section->mr;
|
|
|
|
if (!memory_region_is_ram(mr)) {
|
|
/* Skip MMIO regions */
|
|
return;
|
|
}
|
|
|
|
memory_region_set_dirty(mr, 0, int128_get64(section->size));
|
|
}
|
|
|
|
static MemoryListener hax_memory_listener = {
|
|
.begin = hax_transaction_begin,
|
|
.commit = hax_transaction_commit,
|
|
.region_add = hax_region_add,
|
|
.region_del = hax_region_del,
|
|
.log_sync = hax_log_sync,
|
|
.priority = 10,
|
|
};
|
|
|
|
static void hax_ram_block_added(RAMBlockNotifier *n, void *host, size_t size)
|
|
{
|
|
/*
|
|
* We must register each RAM block with the HAXM kernel module, or
|
|
* hax_set_ram() will fail for any mapping into the RAM block:
|
|
* https://github.com/intel/haxm/blob/master/API.md#hax_vm_ioctl_alloc_ram
|
|
*
|
|
* Old versions of the HAXM kernel module (< 6.2.0) used to preallocate all
|
|
* host physical pages for the RAM block as part of this registration
|
|
* process, hence the name hax_populate_ram().
|
|
*/
|
|
if (hax_populate_ram((uint64_t)(uintptr_t)host, size) < 0) {
|
|
fprintf(stderr, "HAX failed to populate RAM\n");
|
|
abort();
|
|
}
|
|
}
|
|
|
|
static struct RAMBlockNotifier hax_ram_notifier = {
|
|
.ram_block_added = hax_ram_block_added,
|
|
};
|
|
|
|
void hax_memory_init(void)
|
|
{
|
|
ram_block_notifier_add(&hax_ram_notifier);
|
|
memory_listener_register(&hax_memory_listener, &address_space_memory);
|
|
}
|