@@ -93,6 +93,9 @@ ppc_ss.add(when: 'CONFIG_AMIGAONE', if_true: files('amigaone.c'))
ppc_ss.add(when: 'CONFIG_PEGASOS', if_true: files('pegasos.c'))
ppc_ss.add(when: 'CONFIG_VOF', if_true: files('vof.c'))
-ppc_ss.add(when: ['CONFIG_VOF', 'CONFIG_PSERIES'], if_true: files('spapr_vof.c'))
+ppc_ss.add(when: ['CONFIG_VOF', 'CONFIG_PSERIES'], if_true: files(
+ 'spapr_vof.c',
+ 'spapr_vof_partition.c',
+))
hw_arch += {'ppc': ppc_ss}
new file mode 100644
@@ -0,0 +1,272 @@
+/*
+ * QEMU PowerPC sPAPR VOF Partition Table Support.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * This implements partition table detection for VOF boot,
+ * supporting MBR and GPT partition tables with focus on PReP boot partition.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/bswap.h"
+#include "qemu/error-report.h"
+#include "system/block-backend-io.h"
+#include "hw/ppc/spapr_vof.h"
+#include <zlib.h>
+
+#define SECTOR_SIZE 512
+#define MBR_PARTITION_ENTRY_SIZE 16
+#define MBR_PARTITION_TABLE_OFFSET 446
+#define MBR_NUM_PARTITIONS 4
+
+#define PARTITION_TYPE_PREP 0x41 /* PReP Boot partition */
+#define PARTITION_TYPE_GPT 0xEE
+
+#define GPT_MAX_PARTITION 128
+#define GPT_SIGNATURE "EFI PART"
+#define GPT_SIGNATURE_SIZE 8
+
+/* PReP Boot: 9E1A2D38-C612-4316-AA26-8B49521E5A8B */
+static const uint8_t GUID_PREP_BOOT[16] = {
+ 0x38, 0x2D, 0x1A, 0x9E, 0x12, 0xC6, 0x16, 0x43,
+ 0xAA, 0x26, 0x8B, 0x49, 0x52, 0x1E, 0x5A, 0x8B
+};
+
+typedef struct MBRPartitionEntry {
+ uint8_t boot_flag;
+ uint8_t start_chs[3];
+ uint8_t type;
+ uint8_t end_chs[3];
+ uint32_t start_lba;
+ uint32_t num_sectors;
+} QEMU_PACKED MBRPartitionEntry;
+
+typedef struct GPTHeader {
+ char signature[8];
+ uint32_t revision;
+ uint32_t header_size;
+ uint32_t header_crc32;
+ uint32_t reserved;
+ uint64_t current_lba;
+ uint64_t backup_lba;
+ uint64_t first_usable_lba;
+ uint64_t last_usable_lba;
+ uint8_t disk_guid[16];
+ uint64_t partition_entries_lba;
+ uint32_t num_partition_entries;
+ uint32_t partition_entry_size;
+ uint32_t partition_array_crc32;
+} QEMU_PACKED GPTHeader;
+
+typedef struct GPTPartitionEntry {
+ uint8_t type_guid[16];
+ uint8_t partition_guid[16];
+ uint64_t first_lba;
+ uint64_t last_lba;
+ uint64_t attributes;
+ uint16_t name[36];
+} QEMU_PACKED GPTPartitionEntry;
+
+static bool find_prep_partition_gpt(BlockBackend *blk,
+ uint64_t *offset, uint64_t *size)
+{
+ uint8_t lba1[SECTOR_SIZE];
+ GPTHeader *header;
+ uint32_t header_size;
+ GPTHeader header_copy;
+ uint32_t crc_stored;
+ uint32_t crc_computed;
+ uint64_t entries_lba;
+ uint32_t num_entries;
+ uint32_t entry_size;
+ int64_t disk_size;
+ uint64_t disk_last_lba;
+ uint32_t array_bytes;
+ g_autofree uint8_t *array_buf = NULL;
+ uint8_t buf[sizeof(GPTPartitionEntry)];
+ GPTPartitionEntry *current_entry;
+ uint32_t i;
+ int ret;
+
+ ret = blk_pread(blk, SECTOR_SIZE, SECTOR_SIZE, lba1, 0);
+ if (ret < 0) {
+ warn_report("GPT: failed to read LBA1 (ret=%d)", ret);
+ return false;
+ }
+
+ header = (GPTHeader *)lba1;
+
+ /* EFI PART signature validation */
+ if (memcmp(header->signature, GPT_SIGNATURE, GPT_SIGNATURE_SIZE) != 0) {
+ return false;
+ }
+
+ /* GPT header size validation */
+ header_size = le32_to_cpu(header->header_size);
+ if (header_size < sizeof(GPTHeader) || header_size > SECTOR_SIZE) {
+ warn_report("GPT: invalid header size %u (expected %zu..%u)",
+ header_size, sizeof(GPTHeader), SECTOR_SIZE);
+ return false;
+ }
+
+ /* CRC32 validation of GPT header */
+ header_copy = *header;
+ header_copy.header_crc32 = 0;
+ crc_stored = le32_to_cpu(header->header_crc32);
+ crc_computed = crc32(0, (uint8_t *)&header_copy, header_size);
+ if (crc_computed != crc_stored) {
+ warn_report("GPT: header CRC32 mismatch (computed=0x%08x "
+ "stored=0x%08x)", crc_computed, crc_stored);
+ return false;
+ }
+
+ entries_lba = le64_to_cpu(header->partition_entries_lba);
+ num_entries = le32_to_cpu(header->num_partition_entries);
+ entry_size = le32_to_cpu(header->partition_entry_size);
+
+ /*
+ * Usually the PReP is the first partition and most systems commonly have
+ * 128 max partitions, so cap the scan at 128
+ */
+ if (num_entries > GPT_MAX_PARTITION) {
+ warn_report("GPT: num_partition_entries %u exceeds %u, "
+ "scanning only the first %u partitions", num_entries,
+ GPT_MAX_PARTITION, GPT_MAX_PARTITION);
+ num_entries = GPT_MAX_PARTITION;
+ }
+
+ if (num_entries == 0) {
+ warn_report("GPT: partition table has no entries");
+ return false;
+ }
+
+ if (entry_size < sizeof(GPTPartitionEntry)) {
+ warn_report("GPT: partition entry size %u is too small", entry_size);
+ return false;
+ }
+
+ disk_size = blk_getlength(blk);
+ if (disk_size <= 0) {
+ warn_report("GPT: failed to get disk size");
+ return false;
+ }
+ disk_last_lba = (uint64_t)disk_size / SECTOR_SIZE - 1;
+
+ if (entries_lba >= UINT64_MAX / SECTOR_SIZE ||
+ entries_lba >= (uint64_t)disk_size / SECTOR_SIZE ||
+ num_entries > ((uint64_t)disk_size - entries_lba * SECTOR_SIZE)
+ / entry_size) {
+ warn_report("GPT: partition entry array extends beyond disk");
+ return false;
+ }
+
+ /* CRC32 validation of GPT partition array */
+ array_bytes = num_entries * entry_size;
+ array_buf = g_malloc(array_bytes);
+ crc_stored = le32_to_cpu(header->partition_array_crc32);
+
+ ret = blk_pread(blk, entries_lba * SECTOR_SIZE, array_bytes, array_buf, 0);
+ if (ret < 0) {
+ warn_report("GPT: failed to read partition entry array for CRC "
+ "(ret=%d)", ret);
+ return false;
+ }
+ crc_computed = crc32(0, array_buf, array_bytes);
+ if (crc_computed != crc_stored) {
+ warn_report("GPT: partition array CRC32 mismatch (computed=0x%08x "
+ "stored=0x%08x)", crc_computed, crc_stored);
+ return false;
+ }
+
+ for (i = 0; i < num_entries; i++) {
+ uint64_t current_entry_offset = entries_lba * SECTOR_SIZE +
+ (uint64_t)i * entry_size;
+ ret = blk_pread(blk, current_entry_offset, sizeof(buf), buf, 0);
+ if (ret < 0) {
+ warn_report("GPT: failed to read partition entry %u (ret=%d)",
+ i, ret);
+ return false;
+ }
+
+ current_entry = (GPTPartitionEntry *)buf;
+ if (memcmp(current_entry->type_guid, GUID_PREP_BOOT,
+ sizeof(GUID_PREP_BOOT)) == 0) {
+ uint64_t first_lba = le64_to_cpu(current_entry->first_lba);
+ uint64_t last_lba = le64_to_cpu(current_entry->last_lba);
+
+ if (last_lba < first_lba) {
+ warn_report("GPT: PReP entry has "
+ "last_lba (%"PRIu64") < first_lba (%"PRIu64"), "
+ "skipping", last_lba, first_lba);
+ continue;
+ }
+ if (first_lba > disk_last_lba || last_lba > disk_last_lba) {
+ warn_report("GPT: PReP entry LBA range [%"PRIu64", %"PRIu64"] "
+ "exceeds disk (%"PRIu64"), skipping",
+ first_lba, last_lba, disk_last_lba);
+ continue;
+ }
+
+ *offset = first_lba * SECTOR_SIZE;
+ *size = (last_lba - first_lba + 1) * SECTOR_SIZE;
+ return true;
+ }
+ }
+ return false;
+}
+
+static bool find_prep_partition_mbr(BlockBackend *blk,
+ uint64_t *offset, uint64_t *size)
+{
+ uint8_t mbr[SECTOR_SIZE];
+ MBRPartitionEntry *entry;
+ int ret;
+ int i;
+
+ ret = blk_pread(blk, 0, SECTOR_SIZE, mbr, 0);
+ if (ret < 0) {
+ warn_report("MBR: failed to read MBR sector (ret=%d)", ret);
+ return false;
+ }
+
+ /* MBR boot signature: byte 510 = 0x55, byte 511 = 0xAA */
+ if (mbr[510] != 0x55 || mbr[511] != 0xAA) {
+ warn_report("MBR: invalid boot signature (0x%02x 0x%02x), "
+ "expected 0x55 0xAA", mbr[510], mbr[511]);
+ return false;
+ }
+
+ for (i = 0; i < MBR_NUM_PARTITIONS; i++) {
+ entry = (MBRPartitionEntry *)&mbr[MBR_PARTITION_TABLE_OFFSET +
+ i * MBR_PARTITION_ENTRY_SIZE];
+
+ if (entry->type == PARTITION_TYPE_GPT) {
+ return find_prep_partition_gpt(blk, offset, size);
+ }
+
+ if (entry->type == PARTITION_TYPE_PREP) {
+ uint32_t start_lba = le32_to_cpu(entry->start_lba);
+ uint32_t num_sectors = le32_to_cpu(entry->num_sectors);
+
+ if (start_lba == 0 || num_sectors == 0) {
+ warn_report("MBR: PReP partition entry %d has invalid "
+ "start_lba=%u or num_sectors=%u, skipping",
+ i, start_lba, num_sectors);
+ continue;
+ }
+ *offset = (uint64_t)start_lba * SECTOR_SIZE;
+ *size = (uint64_t)num_sectors * SECTOR_SIZE;
+ return true;
+ }
+ }
+ return false;
+}
+
+bool spapr_vof_find_prep_partition(BlockBackend *blk,
+ uint64_t *offset, uint64_t *size)
+{
+ if (!blk) {
+ return false;
+ }
+ return find_prep_partition_mbr(blk, offset, size);
+}
new file mode 100644
@@ -0,0 +1,14 @@
+/*
+ * QEMU PowerPC sPAPR VOF Support
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+#ifndef HW_SPAPR_VOF_H
+#define HW_SPAPR_VOF_H
+
+typedef struct BlockBackend BlockBackend;
+
+bool spapr_vof_find_prep_partition(BlockBackend *blk,
+ uint64_t *offset, uint64_t *size);
+
+#endif /* HW_SPAPR_VOF_H */