From: Alexander Graf <graf@amazon.com>
VMApple contains an "aes" engine device that it uses to encrypt and
decrypt its nvram. It has trivial hard coded keys it uses for that
purpose.
Add device emulation for this device model.
Signed-off-by: Alexander Graf <graf@amazon.com>
Signed-off-by: Phil Dennis-Jordan <phil@philjordan.eu>
---
v3:
* Rebased on latest upstream and fixed minor breakages.
* Replaced legacy device reset method with Resettable method
v4:
* Improved logging of unimplemented functions and guest errors.
* Better adherence to naming and coding conventions.
* Cleaner error handling and recovery, including using g_autoptr
hw/vmapple/Kconfig | 2 +
hw/vmapple/aes.c | 572 ++++++++++++++++++++++++++++++++++++++++
hw/vmapple/meson.build | 1 +
hw/vmapple/trace-events | 16 ++
include/qemu/cutils.h | 15 ++
util/hexdump.c | 14 +
6 files changed, 620 insertions(+)
create mode 100644 hw/vmapple/aes.c
diff --git a/hw/vmapple/Kconfig b/hw/vmapple/Kconfig
index 8b137891791..a73504d5999 100644
--- a/hw/vmapple/Kconfig
+++ b/hw/vmapple/Kconfig
@@ -1 +1,3 @@
+config VMAPPLE_AES
+ bool
diff --git a/hw/vmapple/aes.c b/hw/vmapple/aes.c
new file mode 100644
index 00000000000..59cdcd65f90
--- /dev/null
+++ b/hw/vmapple/aes.c
@@ -0,0 +1,572 @@
+/*
+ * QEMU Apple AES device emulation
+ *
+ * Copyright © 2023 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "trace.h"
+#include "crypto/hash.h"
+#include "crypto/aes.h"
+#include "crypto/cipher.h"
+#include "hw/irq.h"
+#include "hw/sysbus.h"
+#include "migration/vmstate.h"
+#include "qemu/cutils.h"
+#include "qemu/log.h"
+#include "qemu/module.h"
+#include "sysemu/dma.h"
+
+#define TYPE_AES "apple-aes"
+OBJECT_DECLARE_SIMPLE_TYPE(AESState, AES)
+
+#define MAX_FIFO_SIZE 9
+
+#define CMD_KEY 0x1
+#define CMD_KEY_CONTEXT_SHIFT 27
+#define CMD_KEY_CONTEXT_MASK (0x1 << CMD_KEY_CONTEXT_SHIFT)
+#define CMD_KEY_SELECT_MAX_IDX 0x7
+#define CMD_KEY_SELECT_SHIFT 24
+#define CMD_KEY_SELECT_MASK (CMD_KEY_SELECT_MAX_IDX << CMD_KEY_SELECT_SHIFT)
+#define CMD_KEY_KEY_LEN_NUM 4u
+#define CMD_KEY_KEY_LEN_SHIFT 22
+#define CMD_KEY_KEY_LEN_MASK ((CMD_KEY_KEY_LEN_NUM - 1u) << CMD_KEY_KEY_LEN_SHIFT)
+#define CMD_KEY_ENCRYPT_SHIFT 20
+#define CMD_KEY_ENCRYPT_MASK (0x1 << CMD_KEY_ENCRYPT_SHIFT)
+#define CMD_KEY_BLOCK_MODE_SHIFT 16
+#define CMD_KEY_BLOCK_MODE_MASK (0x3 << CMD_KEY_BLOCK_MODE_SHIFT)
+#define CMD_IV 0x2
+#define CMD_IV_CONTEXT_SHIFT 26
+#define CMD_IV_CONTEXT_MASK (0x3 << CMD_KEY_CONTEXT_SHIFT)
+#define CMD_DSB 0x3
+#define CMD_SKG 0x4
+#define CMD_DATA 0x5
+#define CMD_DATA_KEY_CTX_SHIFT 27
+#define CMD_DATA_KEY_CTX_MASK (0x1 << CMD_DATA_KEY_CTX_SHIFT)
+#define CMD_DATA_IV_CTX_SHIFT 25
+#define CMD_DATA_IV_CTX_MASK (0x3 << CMD_DATA_IV_CTX_SHIFT)
+#define CMD_DATA_LEN_MASK 0xffffff
+#define CMD_STORE_IV 0x6
+#define CMD_STORE_IV_ADDR_MASK 0xffffff
+#define CMD_WRITE_REG 0x7
+#define CMD_FLAG 0x8
+#define CMD_FLAG_STOP_MASK BIT(26)
+#define CMD_FLAG_RAISE_IRQ_MASK BIT(27)
+#define CMD_FLAG_INFO_MASK 0xff
+#define CMD_MAX 0x10
+
+#define CMD_SHIFT 28
+
+#define REG_STATUS 0xc
+#define REG_STATUS_DMA_READ_RUNNING BIT(0)
+#define REG_STATUS_DMA_READ_PENDING BIT(1)
+#define REG_STATUS_DMA_WRITE_RUNNING BIT(2)
+#define REG_STATUS_DMA_WRITE_PENDING BIT(3)
+#define REG_STATUS_BUSY BIT(4)
+#define REG_STATUS_EXECUTING BIT(5)
+#define REG_STATUS_READY BIT(6)
+#define REG_STATUS_TEXT_DPA_SEEDED BIT(7)
+#define REG_STATUS_UNWRAP_DPA_SEEDED BIT(8)
+
+#define REG_IRQ_STATUS 0x18
+#define REG_IRQ_STATUS_INVALID_CMD BIT(2)
+#define REG_IRQ_STATUS_FLAG BIT(5)
+#define REG_IRQ_ENABLE 0x1c
+#define REG_WATERMARK 0x20
+#define REG_Q_STATUS 0x24
+#define REG_FLAG_INFO 0x30
+#define REG_FIFO 0x200
+
+static const uint32_t key_lens[CMD_KEY_KEY_LEN_NUM] = {
+ [0] = 16,
+ [1] = 24,
+ [2] = 32,
+ [3] = 64,
+};
+
+typedef struct Key {
+ uint32_t key_len;
+ uint8_t key[32];
+} Key;
+
+typedef struct IV {
+ uint32_t iv[4];
+} IV;
+
+static Key builtin_keys[CMD_KEY_SELECT_MAX_IDX + 1] = {
+ [1] = {
+ .key_len = 32,
+ .key = { 0x1 },
+ },
+ [2] = {
+ .key_len = 32,
+ .key = { 0x2 },
+ },
+ [3] = {
+ .key_len = 32,
+ .key = { 0x3 },
+ }
+};
+
+struct AESState {
+ SysBusDevice parent_obj;
+
+ qemu_irq irq;
+ MemoryRegion iomem1;
+ MemoryRegion iomem2;
+ AddressSpace *as;
+
+ uint32_t status;
+ uint32_t q_status;
+ uint32_t irq_status;
+ uint32_t irq_enable;
+ uint32_t watermark;
+ uint32_t flag_info;
+ uint32_t fifo[MAX_FIFO_SIZE];
+ uint32_t fifo_idx;
+ Key key[2];
+ IV iv[4];
+ bool is_encrypt;
+ QCryptoCipherMode block_mode;
+};
+
+static void aes_update_irq(AESState *s)
+{
+ qemu_set_irq(s->irq, !!(s->irq_status & s->irq_enable));
+}
+
+static uint64_t aes1_read(void *opaque, hwaddr offset, unsigned size)
+{
+ AESState *s = opaque;
+ uint64_t res = 0;
+
+ switch (offset) {
+ case REG_STATUS:
+ res = s->status;
+ break;
+ case REG_IRQ_STATUS:
+ res = s->irq_status;
+ break;
+ case REG_IRQ_ENABLE:
+ res = s->irq_enable;
+ break;
+ case REG_WATERMARK:
+ res = s->watermark;
+ break;
+ case REG_Q_STATUS:
+ res = s->q_status;
+ break;
+ case REG_FLAG_INFO:
+ res = s->flag_info;
+ break;
+
+ default:
+ qemu_log_mask(LOG_UNIMP, "%s: Unknown AES MMIO offset %" PRIx64 "\n",
+ __func__, offset);
+ break;
+ }
+
+ trace_aes_read(offset, res);
+
+ return res;
+}
+
+static void fifo_append(AESState *s, uint64_t val)
+{
+ if (s->fifo_idx == MAX_FIFO_SIZE) {
+ /* Exceeded the FIFO. Bail out */
+ return;
+ }
+
+ s->fifo[s->fifo_idx++] = val;
+}
+
+static bool has_payload(AESState *s, uint32_t elems)
+{
+ return s->fifo_idx >= (elems + 1);
+}
+
+static bool cmd_key(AESState *s)
+{
+ uint32_t cmd = s->fifo[0];
+ uint32_t key_select = (cmd & CMD_KEY_SELECT_MASK) >> CMD_KEY_SELECT_SHIFT;
+ uint32_t ctxt = (cmd & CMD_KEY_CONTEXT_MASK) >> CMD_KEY_CONTEXT_SHIFT;
+ uint32_t key_len;
+
+ switch ((cmd & CMD_KEY_BLOCK_MODE_MASK) >> CMD_KEY_BLOCK_MODE_SHIFT) {
+ case 0:
+ s->block_mode = QCRYPTO_CIPHER_MODE_ECB;
+ break;
+ case 1:
+ s->block_mode = QCRYPTO_CIPHER_MODE_CBC;
+ break;
+ default:
+ return false;
+ }
+
+ s->is_encrypt = cmd & CMD_KEY_ENCRYPT_MASK;
+ key_len = key_lens[((cmd & CMD_KEY_KEY_LEN_MASK) >> CMD_KEY_KEY_LEN_SHIFT)];
+
+ if (key_select) {
+ trace_aes_cmd_key_select_builtin(ctxt, key_select,
+ s->is_encrypt ? "en" : "de",
+ QCryptoCipherMode_str(s->block_mode));
+ s->key[ctxt] = builtin_keys[key_select];
+ } else {
+ trace_aes_cmd_key_select_new(ctxt, key_len,
+ s->is_encrypt ? "en" : "de",
+ QCryptoCipherMode_str(s->block_mode));
+ if (key_len > sizeof(s->key[ctxt].key)) {
+ return false;
+ }
+ if (!has_payload(s, key_len / sizeof(uint32_t))) {
+ /* wait for payload */
+ qemu_log_mask(LOG_GUEST_ERROR, "%s: No payload\n", __func__);
+ return false;
+ }
+ memcpy(&s->key[ctxt].key, &s->fifo[1], key_len);
+ s->key[ctxt].key_len = key_len;
+ }
+
+ return true;
+}
+
+static bool cmd_iv(AESState *s)
+{
+ uint32_t cmd = s->fifo[0];
+ uint32_t ctxt = (cmd & CMD_IV_CONTEXT_MASK) >> CMD_IV_CONTEXT_SHIFT;
+
+ if (!has_payload(s, 4)) {
+ /* wait for payload */
+ return false;
+ }
+ memcpy(&s->iv[ctxt].iv, &s->fifo[1], sizeof(s->iv[ctxt].iv));
+ trace_aes_cmd_iv(ctxt, s->fifo[1], s->fifo[2], s->fifo[3], s->fifo[4]);
+
+ return true;
+}
+
+static void dump_data(const char *desc, const void *p, size_t len)
+{
+ static const size_t MAX_LEN = 0x1000;
+ char hex[MAX_LEN * 2 + 1] = "";
+
+ if (len > MAX_LEN) {
+ return;
+ }
+
+ qemu_hexdump_to_buffer(hex, sizeof(hex), p, len);
+ trace_aes_dump_data(desc, hex);
+}
+
+static bool cmd_data(AESState *s)
+{
+ uint32_t cmd = s->fifo[0];
+ uint32_t ctxt_iv = 0;
+ uint32_t ctxt_key = (cmd & CMD_DATA_KEY_CTX_MASK) >> CMD_DATA_KEY_CTX_SHIFT;
+ uint32_t len = cmd & CMD_DATA_LEN_MASK;
+ uint64_t src_addr = s->fifo[2];
+ uint64_t dst_addr = s->fifo[3];
+ QCryptoCipherAlgo alg;
+ g_autoptr(QCryptoCipher) cipher = NULL;
+ g_autoptr(GByteArray) src = NULL;
+ g_autoptr(GByteArray) dst = NULL;
+ MemTxResult r;
+
+ src_addr |= ((uint64_t)s->fifo[1] << 16) & 0xffff00000000ULL;
+ dst_addr |= ((uint64_t)s->fifo[1] << 32) & 0xffff00000000ULL;
+
+ trace_aes_cmd_data(ctxt_key, ctxt_iv, src_addr, dst_addr, len);
+
+ if (!has_payload(s, 3)) {
+ /* wait for payload */
+ qemu_log_mask(LOG_GUEST_ERROR, "%s: No payload\n", __func__);
+ return false;
+ }
+
+ if (ctxt_key >= ARRAY_SIZE(s->key) ||
+ ctxt_iv >= ARRAY_SIZE(s->iv)) {
+ /* Invalid input */
+ qemu_log_mask(LOG_GUEST_ERROR, "%s: Invalid key or iv\n", __func__);
+ return false;
+ }
+
+ src = g_byte_array_sized_new(len);
+ g_byte_array_set_size(src, len);
+ dst = g_byte_array_sized_new(len);
+ g_byte_array_set_size(dst, len);
+
+ r = dma_memory_read(s->as, src_addr, src->data, len, MEMTXATTRS_UNSPECIFIED);
+ if (r != MEMTX_OK) {
+ qemu_log_mask(LOG_GUEST_ERROR, "%s: DMA read of %"PRIu32" bytes "
+ "from 0x%"PRIx64" failed. (r=%d)\n",
+ __func__, len, src_addr, r);
+ return false;
+ }
+
+ dump_data("cmd_data(): src_data=", src->data, len);
+
+ switch (s->key[ctxt_key].key_len) {
+ case 128 / 8:
+ alg = QCRYPTO_CIPHER_ALGO_AES_128;
+ break;
+ case 192 / 8:
+ alg = QCRYPTO_CIPHER_ALGO_AES_192;
+ break;
+ case 256 / 8:
+ alg = QCRYPTO_CIPHER_ALGO_AES_256;
+ break;
+ default:
+ qemu_log_mask(LOG_GUEST_ERROR, "%s: Invalid key length\n", __func__);
+ return false;
+ }
+ cipher = qcrypto_cipher_new(alg, s->block_mode,
+ s->key[ctxt_key].key,
+ s->key[ctxt_key].key_len, NULL);
+ if (!cipher) {
+ qemu_log_mask(LOG_GUEST_ERROR, "%s: Failed to create cipher object\n",
+ __func__);
+ return false;
+ }
+ if (s->block_mode != QCRYPTO_CIPHER_MODE_ECB) {
+ if (qcrypto_cipher_setiv(cipher, (void *)s->iv[ctxt_iv].iv,
+ sizeof(s->iv[ctxt_iv].iv), NULL) != 0) {
+ qemu_log_mask(LOG_GUEST_ERROR, "%s: Failed to set IV\n", __func__);
+ return false;
+ }
+ }
+ if (s->is_encrypt) {
+ if (qcrypto_cipher_encrypt(cipher, src->data, dst->data, len, NULL) != 0) {
+ qemu_log_mask(LOG_GUEST_ERROR, "%s: Encryption failed\n", __func__);
+ return false;
+ }
+ } else {
+ if (qcrypto_cipher_decrypt(cipher, src->data, dst->data, len, NULL) != 0) {
+ qemu_log_mask(LOG_GUEST_ERROR, "%s: Decryption failed\n", __func__);
+ return false;
+ }
+ }
+
+ dump_data("cmd_data(): dst_data=", dst->data, len);
+ r = dma_memory_write(s->as, dst_addr, dst->data, len, MEMTXATTRS_UNSPECIFIED);
+ if (r != MEMTX_OK) {
+ qemu_log_mask(LOG_GUEST_ERROR, "%s: DMA write of %"PRIu32" bytes "
+ "to 0x%"PRIx64" failed. (r=%d)\n",
+ __func__, len, src_addr, r);
+ return false;
+ }
+
+ return true;
+}
+
+static bool cmd_store_iv(AESState *s)
+{
+ uint32_t cmd = s->fifo[0];
+ uint32_t ctxt = (cmd & CMD_IV_CONTEXT_MASK) >> CMD_IV_CONTEXT_SHIFT;
+ uint64_t addr = s->fifo[1];
+
+ if (!has_payload(s, 1)) {
+ /* wait for payload */
+ qemu_log_mask(LOG_GUEST_ERROR, "%s: No payload\n", __func__);
+ return false;
+ }
+
+ if (ctxt >= ARRAY_SIZE(s->iv)) {
+ /* Invalid context selected */
+ return false;
+ }
+
+ addr |= ((uint64_t)cmd << 32) & 0xff00000000ULL;
+ cpu_physical_memory_write(addr, &s->iv[ctxt].iv, sizeof(s->iv[ctxt].iv));
+
+ trace_aes_cmd_store_iv(ctxt, addr, s->iv[ctxt].iv[0], s->iv[ctxt].iv[1],
+ s->iv[ctxt].iv[2], s->iv[ctxt].iv[3]);
+
+ return true;
+}
+
+static bool cmd_flag(AESState *s)
+{
+ uint32_t cmd = s->fifo[0];
+ uint32_t raise_irq = cmd & CMD_FLAG_RAISE_IRQ_MASK;
+
+ /* We always process data when it's coming in, so fire an IRQ immediately */
+ if (raise_irq) {
+ s->irq_status |= REG_IRQ_STATUS_FLAG;
+ }
+
+ s->flag_info = cmd & CMD_FLAG_INFO_MASK;
+
+ trace_aes_cmd_flag(!!raise_irq, s->flag_info);
+
+ return true;
+}
+
+static void fifo_process(AESState *s)
+{
+ uint32_t cmd = s->fifo[0] >> CMD_SHIFT;
+ bool success = false;
+
+ if (!s->fifo_idx) {
+ return;
+ }
+
+ switch (cmd) {
+ case CMD_KEY:
+ success = cmd_key(s);
+ break;
+ case CMD_IV:
+ success = cmd_iv(s);
+ break;
+ case CMD_DATA:
+ success = cmd_data(s);
+ break;
+ case CMD_STORE_IV:
+ success = cmd_store_iv(s);
+ break;
+ case CMD_FLAG:
+ success = cmd_flag(s);
+ break;
+ default:
+ s->irq_status |= REG_IRQ_STATUS_INVALID_CMD;
+ break;
+ }
+
+ if (success) {
+ s->fifo_idx = 0;
+ }
+
+ trace_aes_fifo_process(cmd, success ? 1 : 0);
+}
+
+static void aes1_write(void *opaque, hwaddr offset, uint64_t val, unsigned size)
+{
+ AESState *s = opaque;
+
+ trace_aes_write(offset, val);
+
+ switch (offset) {
+ case REG_IRQ_STATUS:
+ s->irq_status &= ~val;
+ break;
+ case REG_IRQ_ENABLE:
+ s->irq_enable = val;
+ break;
+ case REG_FIFO:
+ fifo_append(s, val);
+ fifo_process(s);
+ break;
+ default:
+ qemu_log_mask(LOG_UNIMP,
+ "%s: Unknown AES MMIO offset %"PRIx64", data %"PRIx64"\n",
+ __func__, offset, val);
+ return;
+ }
+
+ aes_update_irq(s);
+}
+
+static const MemoryRegionOps aes1_ops = {
+ .read = aes1_read,
+ .write = aes1_write,
+ .endianness = DEVICE_NATIVE_ENDIAN,
+ .valid = {
+ .min_access_size = 4,
+ .max_access_size = 8,
+ },
+ .impl = {
+ .min_access_size = 4,
+ .max_access_size = 4,
+ },
+};
+
+static uint64_t aes2_read(void *opaque, hwaddr offset, unsigned size)
+{
+ uint64_t res = 0;
+
+ switch (offset) {
+ case 0:
+ res = 0;
+ break;
+ default:
+ trace_aes_2_read_unknown(offset);
+ break;
+ }
+
+ trace_aes_2_read(offset, res);
+
+ return res;
+}
+
+static void aes2_write(void *opaque, hwaddr offset, uint64_t val, unsigned size)
+{
+ trace_aes_2_write(offset, val);
+
+ switch (offset) {
+ default:
+ trace_aes_2_write_unknown(offset);
+ return;
+ }
+}
+
+static const MemoryRegionOps aes2_ops = {
+ .read = aes2_read,
+ .write = aes2_write,
+ .endianness = DEVICE_NATIVE_ENDIAN,
+ .valid = {
+ .min_access_size = 4,
+ .max_access_size = 8,
+ },
+ .impl = {
+ .min_access_size = 4,
+ .max_access_size = 4,
+ },
+};
+
+static void aes_reset(Object *obj, ResetType type)
+{
+ AESState *s = AES(obj);
+
+ s->status = 0x3f80;
+ s->q_status = 2;
+ s->irq_status = 0;
+ s->irq_enable = 0;
+ s->watermark = 0;
+}
+
+static void aes_init(Object *obj)
+{
+ AESState *s = AES(obj);
+
+ memory_region_init_io(&s->iomem1, obj, &aes1_ops, s, TYPE_AES, 0x4000);
+ memory_region_init_io(&s->iomem2, obj, &aes2_ops, s, TYPE_AES, 0x4000);
+ sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->iomem1);
+ sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->iomem2);
+ sysbus_init_irq(SYS_BUS_DEVICE(s), &s->irq);
+ s->as = &address_space_memory;
+}
+
+static void aes_class_init(ObjectClass *klass, void *data)
+{
+ ResettableClass *rc = RESETTABLE_CLASS(klass);
+
+ rc->phases.hold = aes_reset;
+}
+
+static const TypeInfo aes_info = {
+ .name = TYPE_AES,
+ .parent = TYPE_SYS_BUS_DEVICE,
+ .instance_size = sizeof(AESState),
+ .class_init = aes_class_init,
+ .instance_init = aes_init,
+};
+
+static void aes_register_types(void)
+{
+ type_register_static(&aes_info);
+}
+
+type_init(aes_register_types)
diff --git a/hw/vmapple/meson.build b/hw/vmapple/meson.build
index e69de29bb2d..bcd4dcb28d2 100644
--- a/hw/vmapple/meson.build
+++ b/hw/vmapple/meson.build
@@ -0,0 +1 @@
+system_ss.add(when: 'CONFIG_VMAPPLE_AES', if_true: files('aes.c'))
diff --git a/hw/vmapple/trace-events b/hw/vmapple/trace-events
index 9ccc5790487..12757bc0852 100644
--- a/hw/vmapple/trace-events
+++ b/hw/vmapple/trace-events
@@ -1,2 +1,18 @@
# See docs/devel/tracing.rst for syntax documentation.
+# aes.c
+aes_read(uint64_t offset, uint64_t res) "offset=0x%"PRIx64" res=0x%"PRIx64
+aes_cmd_key_select_builtin(uint32_t ctx, uint32_t key_id, const char *direction, const char *cipher) "[%d] Selecting builtin key %d to %scrypt with %s"
+aes_cmd_key_select_new(uint32_t ctx, uint32_t key_len, const char *direction, const char *cipher) "[%d] Selecting new key size=%d to %scrypt with %s"
+aes_cmd_iv(uint32_t ctx, uint32_t iv0, uint32_t iv1, uint32_t iv2, uint32_t iv3) "[%d] 0x%08x 0x%08x 0x%08x 0x%08x"
+aes_cmd_data(uint32_t key, uint32_t iv, uint64_t src, uint64_t dst, uint32_t len) "[key=%d iv=%d] src=0x%"PRIx64" dst=0x%"PRIx64" len=0x%x"
+aes_cmd_store_iv(uint32_t ctx, uint64_t addr, uint32_t iv0, uint32_t iv1, uint32_t iv2, uint32_t iv3) "[%d] addr=0x%"PRIx64"x -> 0x%08x 0x%08x 0x%08x 0x%08x"
+aes_cmd_flag(uint32_t raise, uint32_t flag_info) "raise=%d flag_info=0x%x"
+aes_fifo_process(uint32_t cmd, uint32_t success) "cmd=%d success=%d"
+aes_write(uint64_t offset, uint64_t val) "offset=0x%"PRIx64" val=0x%"PRIx64
+aes_2_read_unknown(uint64_t offset) "offset=0x%"PRIx64
+aes_2_read(uint64_t offset, uint64_t res) "offset=0x%"PRIx64" res=0x%"PRIx64
+aes_2_write_unknown(uint64_t offset) "offset=0x%"PRIx64
+aes_2_write(uint64_t offset, uint64_t val) "offset=0x%"PRIx64" val=0x%"PRIx64
+aes_dump_data(const char *desc, const char *hex) "%s%s"
+
diff --git a/include/qemu/cutils.h b/include/qemu/cutils.h
index 34a9b9b2204..36c68ce86c5 100644
--- a/include/qemu/cutils.h
+++ b/include/qemu/cutils.h
@@ -302,4 +302,19 @@ GString *qemu_hexdump_line(GString *str, const void *buf, size_t len,
void qemu_hexdump(FILE *fp, const char *prefix,
const void *bufptr, size_t size);
+/**
+ * qemu_hexdump_to_buffer:
+ * @buffer: output string buffer
+ * @buffer_size: amount of available space in buffer. Must be at least
+ * data_size*2+1.
+ * @data: input bytes
+ * @data_size: number of bytes in data
+ *
+ * Converts the @data_size bytes in @data into hex digit pairs, writing them to
+ * @buffer. Finally, a nul terminating character is written; @buffer therefore
+ * needs space for (data_size*2+1) chars.
+ */
+void qemu_hexdump_to_buffer(char *restrict buffer, size_t buffer_size,
+ const uint8_t *restrict data, size_t data_size);
+
#endif
diff --git a/util/hexdump.c b/util/hexdump.c
index ae0d4992dcf..86345db20a8 100644
--- a/util/hexdump.c
+++ b/util/hexdump.c
@@ -97,3 +97,17 @@ void qemu_hexdump(FILE *fp, const char *prefix,
}
}
+
+void qemu_hexdump_to_buffer(char *restrict buffer, size_t buffer_size,
+ const uint8_t *restrict data, size_t data_size)
+{
+ size_t i;
+
+ assert(buffer_size >= data_size * 2 + 1 && buffer_size > data_size);
+ for (i = 0; i < data_size; i++) {
+ uint8_t val = data[i];
+ *(buffer++) = hexdump_nibble(val >> 4);
+ *(buffer++) = hexdump_nibble(val & 0xf);
+ }
+ *buffer = '\0';
+}
--
2.39.3 (Apple Git-145)
On 2024/10/24 19:28, Phil Dennis-Jordan wrote:
> From: Alexander Graf <graf@amazon.com>
>
> VMApple contains an "aes" engine device that it uses to encrypt and
> decrypt its nvram. It has trivial hard coded keys it uses for that
> purpose.
>
> Add device emulation for this device model.
>
> Signed-off-by: Alexander Graf <graf@amazon.com>
> Signed-off-by: Phil Dennis-Jordan <phil@philjordan.eu>
> ---
> v3:
>
> * Rebased on latest upstream and fixed minor breakages.
> * Replaced legacy device reset method with Resettable method
>
> v4:
>
> * Improved logging of unimplemented functions and guest errors.
> * Better adherence to naming and coding conventions.
> * Cleaner error handling and recovery, including using g_autoptr
>
> hw/vmapple/Kconfig | 2 +
> hw/vmapple/aes.c | 572 ++++++++++++++++++++++++++++++++++++++++
> hw/vmapple/meson.build | 1 +
> hw/vmapple/trace-events | 16 ++
> include/qemu/cutils.h | 15 ++
> util/hexdump.c | 14 +
> 6 files changed, 620 insertions(+)
> create mode 100644 hw/vmapple/aes.c
>
> diff --git a/hw/vmapple/Kconfig b/hw/vmapple/Kconfig
> index 8b137891791..a73504d5999 100644
> --- a/hw/vmapple/Kconfig
> +++ b/hw/vmapple/Kconfig
> @@ -1 +1,3 @@
> +config VMAPPLE_AES
> + bool
>
> diff --git a/hw/vmapple/aes.c b/hw/vmapple/aes.c
> new file mode 100644
> index 00000000000..59cdcd65f90
> --- /dev/null
> +++ b/hw/vmapple/aes.c
> @@ -0,0 +1,572 @@
> +/*
> + * QEMU Apple AES device emulation
> + *
> + * Copyright © 2023 Amazon.com, Inc. or its affiliates. All Rights Reserved.
> + *
> + * This work is licensed under the terms of the GNU GPL, version 2 or later.
> + * See the COPYING file in the top-level directory.
> + */
> +
> +#include "qemu/osdep.h"
> +#include "trace.h"
> +#include "crypto/hash.h"
> +#include "crypto/aes.h"
> +#include "crypto/cipher.h"
> +#include "hw/irq.h"
> +#include "hw/sysbus.h"
> +#include "migration/vmstate.h"
> +#include "qemu/cutils.h"
> +#include "qemu/log.h"
> +#include "qemu/module.h"
> +#include "sysemu/dma.h"
> +
> +#define TYPE_AES "apple-aes"
> +OBJECT_DECLARE_SIMPLE_TYPE(AESState, AES)
> +
> +#define MAX_FIFO_SIZE 9
> +
> +#define CMD_KEY 0x1
> +#define CMD_KEY_CONTEXT_SHIFT 27
> +#define CMD_KEY_CONTEXT_MASK (0x1 << CMD_KEY_CONTEXT_SHIFT)
> +#define CMD_KEY_SELECT_MAX_IDX 0x7
> +#define CMD_KEY_SELECT_SHIFT 24
> +#define CMD_KEY_SELECT_MASK (CMD_KEY_SELECT_MAX_IDX << CMD_KEY_SELECT_SHIFT)
> +#define CMD_KEY_KEY_LEN_NUM 4u
> +#define CMD_KEY_KEY_LEN_SHIFT 22
> +#define CMD_KEY_KEY_LEN_MASK ((CMD_KEY_KEY_LEN_NUM - 1u) << CMD_KEY_KEY_LEN_SHIFT)
> +#define CMD_KEY_ENCRYPT_SHIFT 20
> +#define CMD_KEY_ENCRYPT_MASK (0x1 << CMD_KEY_ENCRYPT_SHIFT)
> +#define CMD_KEY_BLOCK_MODE_SHIFT 16
> +#define CMD_KEY_BLOCK_MODE_MASK (0x3 << CMD_KEY_BLOCK_MODE_SHIFT)
> +#define CMD_IV 0x2
> +#define CMD_IV_CONTEXT_SHIFT 26
> +#define CMD_IV_CONTEXT_MASK (0x3 << CMD_KEY_CONTEXT_SHIFT)
> +#define CMD_DSB 0x3
> +#define CMD_SKG 0x4
> +#define CMD_DATA 0x5
> +#define CMD_DATA_KEY_CTX_SHIFT 27
> +#define CMD_DATA_KEY_CTX_MASK (0x1 << CMD_DATA_KEY_CTX_SHIFT)
> +#define CMD_DATA_IV_CTX_SHIFT 25
> +#define CMD_DATA_IV_CTX_MASK (0x3 << CMD_DATA_IV_CTX_SHIFT)
> +#define CMD_DATA_LEN_MASK 0xffffff
> +#define CMD_STORE_IV 0x6
> +#define CMD_STORE_IV_ADDR_MASK 0xffffff
> +#define CMD_WRITE_REG 0x7
> +#define CMD_FLAG 0x8
> +#define CMD_FLAG_STOP_MASK BIT(26)
> +#define CMD_FLAG_RAISE_IRQ_MASK BIT(27)
> +#define CMD_FLAG_INFO_MASK 0xff
> +#define CMD_MAX 0x10
> +
> +#define CMD_SHIFT 28
> +
> +#define REG_STATUS 0xc
> +#define REG_STATUS_DMA_READ_RUNNING BIT(0)
> +#define REG_STATUS_DMA_READ_PENDING BIT(1)
> +#define REG_STATUS_DMA_WRITE_RUNNING BIT(2)
> +#define REG_STATUS_DMA_WRITE_PENDING BIT(3)
> +#define REG_STATUS_BUSY BIT(4)
> +#define REG_STATUS_EXECUTING BIT(5)
> +#define REG_STATUS_READY BIT(6)
> +#define REG_STATUS_TEXT_DPA_SEEDED BIT(7)
> +#define REG_STATUS_UNWRAP_DPA_SEEDED BIT(8)
> +
> +#define REG_IRQ_STATUS 0x18
> +#define REG_IRQ_STATUS_INVALID_CMD BIT(2)
> +#define REG_IRQ_STATUS_FLAG BIT(5)
> +#define REG_IRQ_ENABLE 0x1c
> +#define REG_WATERMARK 0x20
> +#define REG_Q_STATUS 0x24
> +#define REG_FLAG_INFO 0x30
> +#define REG_FIFO 0x200
> +
> +static const uint32_t key_lens[CMD_KEY_KEY_LEN_NUM] = {
> + [0] = 16,
> + [1] = 24,
> + [2] = 32,
> + [3] = 64,
> +};
> +
> +typedef struct Key {
> + uint32_t key_len;
> + uint8_t key[32];
> +} Key;
> +
> +typedef struct IV {
> + uint32_t iv[4];
> +} IV;
> +
> +static Key builtin_keys[CMD_KEY_SELECT_MAX_IDX + 1] = {
> + [1] = {
> + .key_len = 32,
> + .key = { 0x1 },
> + },
> + [2] = {
> + .key_len = 32,
> + .key = { 0x2 },
> + },
> + [3] = {
> + .key_len = 32,
> + .key = { 0x3 },
> + }
> +};
> +
> +struct AESState {
> + SysBusDevice parent_obj;
> +
> + qemu_irq irq;
> + MemoryRegion iomem1;
> + MemoryRegion iomem2;
> + AddressSpace *as;
> +
> + uint32_t status;
> + uint32_t q_status;
> + uint32_t irq_status;
> + uint32_t irq_enable;
> + uint32_t watermark;
> + uint32_t flag_info;
> + uint32_t fifo[MAX_FIFO_SIZE];
> + uint32_t fifo_idx;
> + Key key[2];
> + IV iv[4];
> + bool is_encrypt;
> + QCryptoCipherMode block_mode;
> +};
> +
> +static void aes_update_irq(AESState *s)
> +{
> + qemu_set_irq(s->irq, !!(s->irq_status & s->irq_enable));
> +}
> +
> +static uint64_t aes1_read(void *opaque, hwaddr offset, unsigned size)
> +{
> + AESState *s = opaque;
> + uint64_t res = 0;
> +
> + switch (offset) {
> + case REG_STATUS:
> + res = s->status;
> + break;
> + case REG_IRQ_STATUS:
> + res = s->irq_status;
> + break;
> + case REG_IRQ_ENABLE:
> + res = s->irq_enable;
> + break;
> + case REG_WATERMARK:
> + res = s->watermark;
> + break;
> + case REG_Q_STATUS:
> + res = s->q_status;
> + break;
> + case REG_FLAG_INFO:
> + res = s->flag_info;
> + break;
> +
> + default:
> + qemu_log_mask(LOG_UNIMP, "%s: Unknown AES MMIO offset %" PRIx64 "\n",
> + __func__, offset);
> + break;
> + }
> +
> + trace_aes_read(offset, res);
> +
> + return res;
> +}
> +
> +static void fifo_append(AESState *s, uint64_t val)
> +{
> + if (s->fifo_idx == MAX_FIFO_SIZE) {
> + /* Exceeded the FIFO. Bail out */
> + return;
> + }
> +
> + s->fifo[s->fifo_idx++] = val;
> +}
> +
> +static bool has_payload(AESState *s, uint32_t elems)
> +{
> + return s->fifo_idx >= (elems + 1);
> +}
> +
> +static bool cmd_key(AESState *s)
> +{
> + uint32_t cmd = s->fifo[0];
> + uint32_t key_select = (cmd & CMD_KEY_SELECT_MASK) >> CMD_KEY_SELECT_SHIFT;
> + uint32_t ctxt = (cmd & CMD_KEY_CONTEXT_MASK) >> CMD_KEY_CONTEXT_SHIFT;
> + uint32_t key_len;
> +
> + switch ((cmd & CMD_KEY_BLOCK_MODE_MASK) >> CMD_KEY_BLOCK_MODE_SHIFT) {
> + case 0:
> + s->block_mode = QCRYPTO_CIPHER_MODE_ECB;
> + break;
> + case 1:
> + s->block_mode = QCRYPTO_CIPHER_MODE_CBC;
> + break;
> + default:
> + return false;
> + }
> +
> + s->is_encrypt = cmd & CMD_KEY_ENCRYPT_MASK;
> + key_len = key_lens[((cmd & CMD_KEY_KEY_LEN_MASK) >> CMD_KEY_KEY_LEN_SHIFT)];
> +
> + if (key_select) {
> + trace_aes_cmd_key_select_builtin(ctxt, key_select,
> + s->is_encrypt ? "en" : "de",
> + QCryptoCipherMode_str(s->block_mode));
> + s->key[ctxt] = builtin_keys[key_select];
> + } else {
> + trace_aes_cmd_key_select_new(ctxt, key_len,
> + s->is_encrypt ? "en" : "de",
> + QCryptoCipherMode_str(s->block_mode));
> + if (key_len > sizeof(s->key[ctxt].key)) {
> + return false;
> + }
> + if (!has_payload(s, key_len / sizeof(uint32_t))) {
> + /* wait for payload */
> + qemu_log_mask(LOG_GUEST_ERROR, "%s: No payload\n", __func__);
> + return false;
> + }
> + memcpy(&s->key[ctxt].key, &s->fifo[1], key_len);
> + s->key[ctxt].key_len = key_len;
> + }
> +
> + return true;
> +}
> +
> +static bool cmd_iv(AESState *s)
> +{
> + uint32_t cmd = s->fifo[0];
> + uint32_t ctxt = (cmd & CMD_IV_CONTEXT_MASK) >> CMD_IV_CONTEXT_SHIFT;
> +
> + if (!has_payload(s, 4)) {
> + /* wait for payload */
> + return false;
> + }
> + memcpy(&s->iv[ctxt].iv, &s->fifo[1], sizeof(s->iv[ctxt].iv));
> + trace_aes_cmd_iv(ctxt, s->fifo[1], s->fifo[2], s->fifo[3], s->fifo[4]);
> +
> + return true;
> +}
> +
> +static void dump_data(const char *desc, const void *p, size_t len)
> +{
> + static const size_t MAX_LEN = 0x1000;
> + char hex[MAX_LEN * 2 + 1] = "";
> +
> + if (len > MAX_LEN) {
> + return;
> + }
> +
> + qemu_hexdump_to_buffer(hex, sizeof(hex), p, len);
> + trace_aes_dump_data(desc, hex);
> +}
> +
> +static bool cmd_data(AESState *s)
> +{
> + uint32_t cmd = s->fifo[0];
> + uint32_t ctxt_iv = 0;
> + uint32_t ctxt_key = (cmd & CMD_DATA_KEY_CTX_MASK) >> CMD_DATA_KEY_CTX_SHIFT;
> + uint32_t len = cmd & CMD_DATA_LEN_MASK;
> + uint64_t src_addr = s->fifo[2];
> + uint64_t dst_addr = s->fifo[3];
> + QCryptoCipherAlgo alg;
> + g_autoptr(QCryptoCipher) cipher = NULL;
> + g_autoptr(GByteArray) src = NULL;
> + g_autoptr(GByteArray) dst = NULL;
> + MemTxResult r;
> +
> + src_addr |= ((uint64_t)s->fifo[1] << 16) & 0xffff00000000ULL;
> + dst_addr |= ((uint64_t)s->fifo[1] << 32) & 0xffff00000000ULL;
> +
> + trace_aes_cmd_data(ctxt_key, ctxt_iv, src_addr, dst_addr, len);
> +
> + if (!has_payload(s, 3)) {
> + /* wait for payload */
> + qemu_log_mask(LOG_GUEST_ERROR, "%s: No payload\n", __func__);
> + return false;
> + }
> +
> + if (ctxt_key >= ARRAY_SIZE(s->key) ||
> + ctxt_iv >= ARRAY_SIZE(s->iv)) {
> + /* Invalid input */
> + qemu_log_mask(LOG_GUEST_ERROR, "%s: Invalid key or iv\n", __func__);
> + return false;
> + }
> +
> + src = g_byte_array_sized_new(len);
> + g_byte_array_set_size(src, len);
> + dst = g_byte_array_sized_new(len);
> + g_byte_array_set_size(dst, len);
> +
> + r = dma_memory_read(s->as, src_addr, src->data, len, MEMTXATTRS_UNSPECIFIED);
> + if (r != MEMTX_OK) {
> + qemu_log_mask(LOG_GUEST_ERROR, "%s: DMA read of %"PRIu32" bytes "
> + "from 0x%"PRIx64" failed. (r=%d)\n",
> + __func__, len, src_addr, r);
> + return false;
> + }
> +
> + dump_data("cmd_data(): src_data=", src->data, len);
> +
> + switch (s->key[ctxt_key].key_len) {
> + case 128 / 8:
> + alg = QCRYPTO_CIPHER_ALGO_AES_128;
> + break;
> + case 192 / 8:
> + alg = QCRYPTO_CIPHER_ALGO_AES_192;
> + break;
> + case 256 / 8:
> + alg = QCRYPTO_CIPHER_ALGO_AES_256;
> + break;
> + default:
> + qemu_log_mask(LOG_GUEST_ERROR, "%s: Invalid key length\n", __func__);
> + return false;
> + }
> + cipher = qcrypto_cipher_new(alg, s->block_mode,
> + s->key[ctxt_key].key,
> + s->key[ctxt_key].key_len, NULL);
> + if (!cipher) {
> + qemu_log_mask(LOG_GUEST_ERROR, "%s: Failed to create cipher object\n",
> + __func__);
> + return false;
> + }
> + if (s->block_mode != QCRYPTO_CIPHER_MODE_ECB) {
> + if (qcrypto_cipher_setiv(cipher, (void *)s->iv[ctxt_iv].iv,
> + sizeof(s->iv[ctxt_iv].iv), NULL) != 0) {
> + qemu_log_mask(LOG_GUEST_ERROR, "%s: Failed to set IV\n", __func__);
> + return false;
> + }
> + }
> + if (s->is_encrypt) {
> + if (qcrypto_cipher_encrypt(cipher, src->data, dst->data, len, NULL) != 0) {
> + qemu_log_mask(LOG_GUEST_ERROR, "%s: Encryption failed\n", __func__);
> + return false;
> + }
> + } else {
> + if (qcrypto_cipher_decrypt(cipher, src->data, dst->data, len, NULL) != 0) {
> + qemu_log_mask(LOG_GUEST_ERROR, "%s: Decryption failed\n", __func__);
> + return false;
> + }
> + }
> +
> + dump_data("cmd_data(): dst_data=", dst->data, len);
> + r = dma_memory_write(s->as, dst_addr, dst->data, len, MEMTXATTRS_UNSPECIFIED);
> + if (r != MEMTX_OK) {
> + qemu_log_mask(LOG_GUEST_ERROR, "%s: DMA write of %"PRIu32" bytes "
> + "to 0x%"PRIx64" failed. (r=%d)\n",
> + __func__, len, src_addr, r);
> + return false;
> + }
> +
> + return true;
> +}
> +
> +static bool cmd_store_iv(AESState *s)
> +{
> + uint32_t cmd = s->fifo[0];
> + uint32_t ctxt = (cmd & CMD_IV_CONTEXT_MASK) >> CMD_IV_CONTEXT_SHIFT;
> + uint64_t addr = s->fifo[1];
> +
> + if (!has_payload(s, 1)) {
> + /* wait for payload */
> + qemu_log_mask(LOG_GUEST_ERROR, "%s: No payload\n", __func__);
> + return false;
> + }
> +
> + if (ctxt >= ARRAY_SIZE(s->iv)) {
> + /* Invalid context selected */
> + return false;
> + }
> +
> + addr |= ((uint64_t)cmd << 32) & 0xff00000000ULL;
> + cpu_physical_memory_write(addr, &s->iv[ctxt].iv, sizeof(s->iv[ctxt].iv));
> +
> + trace_aes_cmd_store_iv(ctxt, addr, s->iv[ctxt].iv[0], s->iv[ctxt].iv[1],
> + s->iv[ctxt].iv[2], s->iv[ctxt].iv[3]);
> +
> + return true;
> +}
> +
> +static bool cmd_flag(AESState *s)
> +{
> + uint32_t cmd = s->fifo[0];
> + uint32_t raise_irq = cmd & CMD_FLAG_RAISE_IRQ_MASK;
> +
> + /* We always process data when it's coming in, so fire an IRQ immediately */
> + if (raise_irq) {
> + s->irq_status |= REG_IRQ_STATUS_FLAG;
> + }
> +
> + s->flag_info = cmd & CMD_FLAG_INFO_MASK;
> +
> + trace_aes_cmd_flag(!!raise_irq, s->flag_info);
> +
> + return true;
> +}
> +
> +static void fifo_process(AESState *s)
> +{
> + uint32_t cmd = s->fifo[0] >> CMD_SHIFT;
> + bool success = false;
> +
> + if (!s->fifo_idx) {
> + return;
> + }
> +
> + switch (cmd) {
> + case CMD_KEY:
> + success = cmd_key(s);
> + break;
> + case CMD_IV:
> + success = cmd_iv(s);
> + break;
> + case CMD_DATA:
> + success = cmd_data(s);
> + break;
> + case CMD_STORE_IV:
> + success = cmd_store_iv(s);
> + break;
> + case CMD_FLAG:
> + success = cmd_flag(s);
> + break;
> + default:
> + s->irq_status |= REG_IRQ_STATUS_INVALID_CMD;
> + break;
> + }
> +
> + if (success) {
> + s->fifo_idx = 0;
> + }
> +
> + trace_aes_fifo_process(cmd, success ? 1 : 0);
> +}
> +
> +static void aes1_write(void *opaque, hwaddr offset, uint64_t val, unsigned size)
> +{
> + AESState *s = opaque;
> +
> + trace_aes_write(offset, val);
> +
> + switch (offset) {
> + case REG_IRQ_STATUS:
> + s->irq_status &= ~val;
> + break;
> + case REG_IRQ_ENABLE:
> + s->irq_enable = val;
> + break;
> + case REG_FIFO:
> + fifo_append(s, val);
> + fifo_process(s);
> + break;
> + default:
> + qemu_log_mask(LOG_UNIMP,
> + "%s: Unknown AES MMIO offset %"PRIx64", data %"PRIx64"\n",
> + __func__, offset, val);
> + return;
> + }
> +
> + aes_update_irq(s);
> +}
> +
> +static const MemoryRegionOps aes1_ops = {
> + .read = aes1_read,
> + .write = aes1_write,
> + .endianness = DEVICE_NATIVE_ENDIAN,
> + .valid = {
> + .min_access_size = 4,
> + .max_access_size = 8,
> + },
> + .impl = {
> + .min_access_size = 4,
> + .max_access_size = 4,
> + },
> +};
> +
> +static uint64_t aes2_read(void *opaque, hwaddr offset, unsigned size)
> +{
> + uint64_t res = 0;
> +
> + switch (offset) {
> + case 0:
> + res = 0;
> + break;
> + default:
> + trace_aes_2_read_unknown(offset);
aes1_read uses LOG_UNIMP. Let's keep them consistent.
> + break;
> + }
> +
> + trace_aes_2_read(offset, res);
> +
> + return res;
> +}
> +
> +static void aes2_write(void *opaque, hwaddr offset, uint64_t val, unsigned size)
> +{
> + trace_aes_2_write(offset, val);
> +
> + switch (offset) {
> + default:
> + trace_aes_2_write_unknown(offset);
> + return;
> + }
> +}
> +
> +static const MemoryRegionOps aes2_ops = {
> + .read = aes2_read,
> + .write = aes2_write,
> + .endianness = DEVICE_NATIVE_ENDIAN,
> + .valid = {
> + .min_access_size = 4,
> + .max_access_size = 8,
> + },
> + .impl = {
> + .min_access_size = 4,
> + .max_access_size = 4,
> + },
> +};
> +
> +static void aes_reset(Object *obj, ResetType type)
> +{
> + AESState *s = AES(obj);
> +
> + s->status = 0x3f80;
> + s->q_status = 2;
> + s->irq_status = 0;
> + s->irq_enable = 0;
> + s->watermark = 0;
> +}
> +
> +static void aes_init(Object *obj)
> +{
> + AESState *s = AES(obj);
> +
> + memory_region_init_io(&s->iomem1, obj, &aes1_ops, s, TYPE_AES, 0x4000);
> + memory_region_init_io(&s->iomem2, obj, &aes2_ops, s, TYPE_AES, 0x4000);
> + sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->iomem1);
> + sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->iomem2);
> + sysbus_init_irq(SYS_BUS_DEVICE(s), &s->irq);
> + s->as = &address_space_memory;
> +}
> +
> +static void aes_class_init(ObjectClass *klass, void *data)
> +{
> + ResettableClass *rc = RESETTABLE_CLASS(klass);
> +
> + rc->phases.hold = aes_reset;
> +}
> +
> +static const TypeInfo aes_info = {
> + .name = TYPE_AES,
> + .parent = TYPE_SYS_BUS_DEVICE,
> + .instance_size = sizeof(AESState),
> + .class_init = aes_class_init,
> + .instance_init = aes_init,
> +};
> +
> +static void aes_register_types(void)
> +{
> + type_register_static(&aes_info);
> +}
> +
> +type_init(aes_register_types)
> diff --git a/hw/vmapple/meson.build b/hw/vmapple/meson.build
> index e69de29bb2d..bcd4dcb28d2 100644
> --- a/hw/vmapple/meson.build
> +++ b/hw/vmapple/meson.build
> @@ -0,0 +1 @@
> +system_ss.add(when: 'CONFIG_VMAPPLE_AES', if_true: files('aes.c'))
> diff --git a/hw/vmapple/trace-events b/hw/vmapple/trace-events
> index 9ccc5790487..12757bc0852 100644
> --- a/hw/vmapple/trace-events
> +++ b/hw/vmapple/trace-events
> @@ -1,2 +1,18 @@
> # See docs/devel/tracing.rst for syntax documentation.
>
> +# aes.c
> +aes_read(uint64_t offset, uint64_t res) "offset=0x%"PRIx64" res=0x%"PRIx64
> +aes_cmd_key_select_builtin(uint32_t ctx, uint32_t key_id, const char *direction, const char *cipher) "[%d] Selecting builtin key %d to %scrypt with %s"
> +aes_cmd_key_select_new(uint32_t ctx, uint32_t key_len, const char *direction, const char *cipher) "[%d] Selecting new key size=%d to %scrypt with %s"
> +aes_cmd_iv(uint32_t ctx, uint32_t iv0, uint32_t iv1, uint32_t iv2, uint32_t iv3) "[%d] 0x%08x 0x%08x 0x%08x 0x%08x"
> +aes_cmd_data(uint32_t key, uint32_t iv, uint64_t src, uint64_t dst, uint32_t len) "[key=%d iv=%d] src=0x%"PRIx64" dst=0x%"PRIx64" len=0x%x"
> +aes_cmd_store_iv(uint32_t ctx, uint64_t addr, uint32_t iv0, uint32_t iv1, uint32_t iv2, uint32_t iv3) "[%d] addr=0x%"PRIx64"x -> 0x%08x 0x%08x 0x%08x 0x%08x"
> +aes_cmd_flag(uint32_t raise, uint32_t flag_info) "raise=%d flag_info=0x%x"
> +aes_fifo_process(uint32_t cmd, uint32_t success) "cmd=%d success=%d"
> +aes_write(uint64_t offset, uint64_t val) "offset=0x%"PRIx64" val=0x%"PRIx64
> +aes_2_read_unknown(uint64_t offset) "offset=0x%"PRIx64
> +aes_2_read(uint64_t offset, uint64_t res) "offset=0x%"PRIx64" res=0x%"PRIx64
> +aes_2_write_unknown(uint64_t offset) "offset=0x%"PRIx64
> +aes_2_write(uint64_t offset, uint64_t val) "offset=0x%"PRIx64" val=0x%"PRIx64
> +aes_dump_data(const char *desc, const char *hex) "%s%s"
> +
> diff --git a/include/qemu/cutils.h b/include/qemu/cutils.h
> index 34a9b9b2204..36c68ce86c5 100644
> --- a/include/qemu/cutils.h
> +++ b/include/qemu/cutils.h
> @@ -302,4 +302,19 @@ GString *qemu_hexdump_line(GString *str, const void *buf, size_t len,
> void qemu_hexdump(FILE *fp, const char *prefix,
> const void *bufptr, size_t size);
>
> +/**
> + * qemu_hexdump_to_buffer:
> + * @buffer: output string buffer
> + * @buffer_size: amount of available space in buffer. Must be at least
> + * data_size*2+1.
> + * @data: input bytes
> + * @data_size: number of bytes in data
> + *
> + * Converts the @data_size bytes in @data into hex digit pairs, writing them to
> + * @buffer. Finally, a nul terminating character is written; @buffer therefore
> + * needs space for (data_size*2+1) chars.
> + */
> +void qemu_hexdump_to_buffer(char *restrict buffer, size_t buffer_size,
> + const uint8_t *restrict data, size_t data_size);
> +
> #endif
> diff --git a/util/hexdump.c b/util/hexdump.c
> index ae0d4992dcf..86345db20a8 100644
> --- a/util/hexdump.c
> +++ b/util/hexdump.c
> @@ -97,3 +97,17 @@ void qemu_hexdump(FILE *fp, const char *prefix,
> }
>
> }
> +
> +void qemu_hexdump_to_buffer(char *restrict buffer, size_t buffer_size,
> + const uint8_t *restrict data, size_t data_size)
> +{
> + size_t i;
> +
> + assert(buffer_size >= data_size * 2 + 1 && buffer_size > data_size);
I suspect the latter condition is to catch the case where
data_size * 2 + 1 overflows, but it is insufficient, strictly speaking.
It will pass if buffer_size == ((size_t)1 << 63) + 1 && data_size ==
((size_t)1 << 63).
> + for (i = 0; i < data_size; i++) {
> + uint8_t val = data[i];
> + *(buffer++) = hexdump_nibble(val >> 4);
> + *(buffer++) = hexdump_nibble(val & 0xf);
> + }
> + *buffer = '\0';
> +}
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