[Qemu-devel] [PATCH 1/2] resolve memory device roll over reporting issues with >32G guests

[Qemu-devel] [PATCH 1/2] resolve memory device roll over reporting issues with >32G guests

[Gleb Natapov]

The field within the Memory Device type 17 is only a word with the MSB being
used to report MB/KB.  Thereby, a guest with 32G and greater would report
incorrect memory device information rolling over to 0.

This presents more than one memory device and associated memory structures
if the memory is larger than 16G

This is port of commit e65bb0d2bd3a156408996674965555979de3a61b
from qemu pc-bios tree.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
---
 src/smbios.c |   70 +++++++++++++++++++++++++++++-----------------------------
 1 files changed, 35 insertions(+), 35 deletions(-)

diff --git a/src/smbios.c b/src/smbios.c
index c408601..30dc853 100644
--- a/src/smbios.c
+++ b/src/smbios.c
@@ -366,7 +366,7 @@ smbios_type_4_init(void *start, unsigned int cpu_number)
 
 /* Type 16 -- Physical Memory Array */
 static void *
-smbios_type_16_init(void *start)
+smbios_type_16_init(void *start, u32 memory_size_mb, int nr_mem_devs)
 {
     struct smbios_type_16 *p = (struct smbios_type_16*)start;
 
@@ -377,10 +377,9 @@ smbios_type_16_init(void *start)
     p->location = 0x01; /* other */
     p->use = 0x03; /* system memory */
     p->error_correction = 0x01; /* other */
-    u64 memsize = RamSize + RamSizeOver4G;
-    p->maximum_capacity = memsize / 1024;
+    p->maximum_capacity = memory_size_mb * 1024;
     p->memory_error_information_handle = 0xfffe; /* none provided */
-    p->number_of_memory_devices = 1;
+    p->number_of_memory_devices = nr_mem_devs;
 
     start += sizeof(struct smbios_type_16);
     *((u16 *)start) = 0;
@@ -390,21 +389,19 @@ smbios_type_16_init(void *start)
 
 /* Type 17 -- Memory Device */
 static void *
-smbios_type_17_init(void *start)
+smbios_type_17_init(void *start, u32 memory_size_mb, int instance)
 {
     struct smbios_type_17 *p = (struct smbios_type_17 *)start;
 
     p->header.type = 17;
     p->header.length = sizeof(struct smbios_type_17);
-    p->header.handle = 0x1100;
+    p->header.handle = 0x1100 + instance;
 
     p->physical_memory_array_handle = 0x1000;
     p->total_width = 64;
     p->data_width = 64;
-    /* truncate memory_size_mb to 16 bits and clear most significant
-       bit [indicates size in MB] */
-    u64 memsize = RamSize + RamSizeOver4G;
-    p->size = (u16) (memsize / (1024*1024)) & 0x7fff;
+/* TODO: should assert in case something is wrong   ASSERT((memory_size_mb & ~0x7fff) == 0); */
+    p->size = memory_size_mb;
     p->form_factor = 0x09; /* DIMM */
     p->device_set = 0;
     p->device_locator_str = 1;
@@ -413,7 +410,8 @@ smbios_type_17_init(void *start)
     p->type_detail = 0;
 
     start += sizeof(struct smbios_type_17);
-    memcpy((char *)start, "DIMM 1", 7);
+    memcpy((char *)start, "DIMM 0", 7);
+    ((char*)start)[5] += instance;
     start += 7;
     *((u8 *)start) = 0;
 
@@ -422,21 +420,16 @@ smbios_type_17_init(void *start)
 
 /* Type 19 -- Memory Array Mapped Address */
 static void *
-smbios_type_19_init(void *start)
+smbios_type_19_init(void *start, u32 memory_size_mb, int instance)
 {
     struct smbios_type_19 *p = (struct smbios_type_19 *)start;
 
     p->header.type = 19;
     p->header.length = sizeof(struct smbios_type_19);
-    p->header.handle = 0x1300;
+    p->header.handle = 0x1300 + instance;
 
-    p->starting_address = 0;
-    u64 memsize = RamSizeOver4G;
-    if (memsize)
-        memsize += 0x100000000ull;
-    else
-        memsize = RamSize;
-    p->ending_address = memsize / 1024 - 1;
+    p->starting_address = instance << 24;
+    p->ending_address = p->starting_address + (memory_size_mb << 10) - 1;
     p->memory_array_handle = 0x1000;
     p->partition_width = 1;
 
@@ -448,23 +441,18 @@ smbios_type_19_init(void *start)
 
 /* Type 20 -- Memory Device Mapped Address */
 static void *
-smbios_type_20_init(void *start)
+smbios_type_20_init(void *start, u32 memory_size_mb, int instance)
 {
     struct smbios_type_20 *p = (struct smbios_type_20 *)start;
 
     p->header.type = 20;
     p->header.length = sizeof(struct smbios_type_20);
-    p->header.handle = 0x1400;
+    p->header.handle = 0x1400 + instance;
 
-    p->starting_address = 0;
-    u64 memsize = RamSizeOver4G;
-    if (memsize)
-        memsize += 0x100000000ull;
-    else
-        memsize = RamSize;
-    p->ending_address = memsize / 1024 - 1;
-    p->memory_device_handle = 0x1100;
-    p->memory_array_mapped_address_handle = 0x1300;
+    p->starting_address = instance << 24;
+    p->ending_address = p->starting_address + (memory_size_mb << 10) - 1;
+    p->memory_device_handle = 0x1100 + instance;
+    p->memory_array_mapped_address_handle = 0x1300 + instance;
     p->partition_row_position = 1;
     p->interleave_position = 0;
     p->interleaved_data_depth = 0;
@@ -540,10 +528,22 @@ smbios_init(void)
     int cpu_num, smp_cpus = CountCPUs;
     for (cpu_num = 1; cpu_num <= smp_cpus; cpu_num++)
         add_struct(smbios_type_4_init(p, cpu_num));
-    add_struct(smbios_type_16_init(p));
-    add_struct(smbios_type_17_init(p));
-    add_struct(smbios_type_19_init(p));
-    add_struct(smbios_type_20_init(p));
+    u64 memsize = RamSizeOver4G;
+    if (memsize)
+        memsize += 0x100000000ull;
+    else
+        memsize = RamSize;
+    memsize = memsize / (1024 * 1024);
+    int nr_mem_devs = (memsize + 0x3fff) >> 14;
+    add_struct(smbios_type_16_init(p, memsize, nr_mem_devs));
+    int i;
+    for (i = 0; i < nr_mem_devs; i++) {
+        u32 dev_memsize = ((i == (nr_mem_devs - 1))
+                           ? (((memsize-1) & 0x3fff)+1) : 0x4000);
+        add_struct(smbios_type_17_init(p, dev_memsize, i));
+        add_struct(smbios_type_19_init(p, dev_memsize, i));
+        add_struct(smbios_type_20_init(p, dev_memsize, i));
+    }
     add_struct(smbios_type_32_init(p));
     add_struct(smbios_type_127_init(p));
 
-- 
1.6.3.3

[Qemu-devel] [PATCH 2/2] Load SMBIOS entries and files from qemu

[Gleb Natapov]

Allow SMBIOS fields to be overridden and entries replaced by those
read from qemu.

This is port of commit f4a09e759469be74e2598758bfae623b555c4cae
from qemu pc-bios tree.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
---
 src/paravirt.c |  144 +++++++++++++++++++++++++++++++++++++++++++++
 src/paravirt.h |    4 +
 src/smbios.c   |  177 ++++++++++++++++++++++++++++++++++----------------------
 3 files changed, 256 insertions(+), 69 deletions(-)

diff --git a/src/paravirt.c b/src/paravirt.c
index cd1f263..48f10a1 100644
--- a/src/paravirt.c
+++ b/src/paravirt.c
@@ -27,6 +27,13 @@ qemu_cfg_read(u8 *buf, int len)
 }
 
 static void
+qemu_cfg_skip(int len)
+{
+    while (len--)
+        inb(PORT_QEMU_CFG_DATA);
+}
+
+static void
 qemu_cfg_read_entry(void *buf, int e, int len)
 {
     qemu_cfg_select(e);
@@ -99,3 +106,140 @@ void* qemu_cfg_next_acpi_table_load(void *addr, u16 len)
     return addr;
 }
 
+u16 qemu_cfg_smbios_entries(void)
+{
+    u16 cnt;
+
+    if (!qemu_cfg_present)
+        return 0;
+
+    qemu_cfg_read_entry(&cnt, QEMU_CFG_SMBIOS_ENTRIES, sizeof(cnt));
+
+    return cnt;
+}
+
+struct smbios_header {
+    u16 length;
+    u8 type;
+} PACKED;
+
+struct smbios_field {
+    struct smbios_header header;
+    u8 type;
+    u16 offset;
+    u8 data[];
+} PACKED;
+
+struct smbios_table {
+    struct smbios_header header;
+    u8 data[];
+} PACKED;
+
+#define SMBIOS_FIELD_ENTRY 0
+#define SMBIOS_TABLE_ENTRY 1
+
+size_t qemu_cfg_smbios_load_field(int type, size_t offset, void *addr)
+{
+    int i;
+
+    for (i = qemu_cfg_smbios_entries(); i > 0; i--) {
+        struct smbios_field field;
+
+        qemu_cfg_read((u8 *)&field, sizeof(struct smbios_header));
+        field.header.length -= sizeof(struct smbios_header);
+
+        if (field.header.type != SMBIOS_FIELD_ENTRY) {
+            qemu_cfg_skip(field.header.length);
+            continue;
+        }
+
+        qemu_cfg_read((u8 *)&field.type,
+                      sizeof(field) - sizeof(struct smbios_header));
+        field.header.length -= sizeof(field) - sizeof(struct smbios_header);
+
+        if (field.type != type || field.offset != offset) {
+            qemu_cfg_skip(field.header.length);
+            continue;
+        }
+
+        qemu_cfg_read(addr, field.header.length);
+        return (size_t)field.header.length;
+    }
+    return 0;
+}
+
+/* This goes at the beginning of every SMBIOS structure. */
+struct smbios_structure_header {
+	u8 type;
+	u8 length;
+	u16 handle;
+} PACKED;
+
+int qemu_cfg_smbios_load_external(int type, char **p, unsigned *nr_structs,
+                                  unsigned *max_struct_size)
+{
+    static u64 used_bitmap[4] = { 0 };
+    char *start = *p;
+    int i;
+
+    /* Check if we've already reported these tables */
+    if (used_bitmap[(type >> 6) & 0x3] & (1ULL << (type & 0x3f)))
+        return 1;
+
+    /* Don't introduce spurious end markers */
+    if (type == 127)
+        return 0;
+
+    for (i = qemu_cfg_smbios_entries(); i > 0; i--) {
+        struct smbios_table table;
+        struct smbios_structure_header *header = (void *)*p;
+        int string;
+
+        qemu_cfg_read((u8 *)&table, sizeof(struct smbios_header));
+        table.header.length -= sizeof(struct smbios_header);
+
+        if (table.header.type != SMBIOS_TABLE_ENTRY) {
+            qemu_cfg_skip(table.header.length);
+            continue;
+        }
+
+        qemu_cfg_read((u8 *)*p, sizeof(struct smbios_structure_header));
+        table.header.length -= sizeof(struct smbios_structure_header);
+
+        if (header->type != type) {
+            qemu_cfg_skip(table.header.length);
+            continue;
+        }
+
+        *p += sizeof(struct smbios_structure_header);
+
+        /* Entries end with a double NULL char, if there's a string at
+         * the end (length is greater than formatted length), the string
+         * terminator provides the first NULL. */
+        string = header->length < table.header.length +
+                 sizeof(struct smbios_structure_header);
+
+        /* Read the rest and terminate the entry */
+        qemu_cfg_read((u8 *)*p, table.header.length);
+        *p += table.header.length;
+        *((u8*)*p) = 0;
+        (*p)++;
+        if (!string) {
+            *((u8*)*p) = 0;
+            (*p)++;
+        }
+
+        (*nr_structs)++;
+        if (*p - (char *)header > *max_struct_size)
+            *max_struct_size = *p - (char *)header;
+    }
+
+    if (start != *p) {
+        /* Mark that we've reported on this type */
+        used_bitmap[(type >> 6) & 0x3] |= (1ULL << (type & 0x3f));
+        return 1;
+    }
+
+    return 0;
+}
+
diff --git a/src/paravirt.h b/src/paravirt.h
index c2bab71..c2e9470 100644
--- a/src/paravirt.h
+++ b/src/paravirt.h
@@ -43,5 +43,9 @@ void qemu_cfg_get_uuid(u8 *uuid);
 u16 qemu_cfg_acpi_additional_tables(void);
 u16 qemu_cfg_next_acpi_table_len(void);
 void *qemu_cfg_next_acpi_table_load(void *addr, u16 len);
+u16 qemu_cfg_smbios_entries(void);
+size_t qemu_cfg_smbios_load_field(int type, size_t offset, void *addr);
+int qemu_cfg_smbios_load_external(int type, char **p, unsigned *nr_structs,
+                                  unsigned *max_struct_size);
 
 #endif
diff --git a/src/smbios.c b/src/smbios.c
index 30dc853..d4627cf 100644
--- a/src/smbios.c
+++ b/src/smbios.c
@@ -10,25 +10,6 @@
 #include "paravirt.h"
 
 /****************************************************************
- * UUID probe
- ****************************************************************/
-
-static void
-uuid_probe(u8 *bios_uuid)
-{
-    // Default to UUID not set
-    memset(bios_uuid, 0, 16);
-
-    if (! CONFIG_UUID_BACKDOOR)
-        return;
-    if (CONFIG_COREBOOT)
-        return;
-
-    qemu_cfg_get_uuid(bios_uuid);
-}
-
-
-/****************************************************************
  * smbios tables
  ****************************************************************/
 
@@ -229,72 +210,121 @@ smbios_entry_point_init(u16 max_structure_size,
     dprintf(1, "SMBIOS ptr=%p table=%p\n", ep, structure_table_address);
 }
 
+#define load_str_field_with_default(type, field, def)                   \
+    do {                                                                \
+        size = qemu_cfg_smbios_load_field(type,                         \
+                                 offsetof(struct smbios_type_##type,    \
+                                          field), end);                 \
+        if (size > 0) {                                                 \
+            end += size;                                                \
+        } else {                                                        \
+            memcpy(end, def, sizeof(def));                              \
+            end += sizeof(def);                                         \
+        }                                                               \
+        p->field = ++str_index;                                         \
+    } while (0)
+
+#define load_str_field_or_skip(type, field) \
+    do {                                                                \
+        size = qemu_cfg_smbios_load_field(type,                         \
+                                 offsetof(struct smbios_type_##type,    \
+                                          field), end);                 \
+        if (size > 0) {                                                 \
+            end += size;                                                \
+            p->field = ++str_index;                                     \
+        } else {                                                        \
+            p->field = 0;                                               \
+        }                                                               \
+    } while (0)
+
 /* Type 0 -- BIOS Information */
 #define RELEASE_DATE_STR "01/01/2007"
 static void *
-smbios_type_0_init(void *start)
+smbios_init_type_0(void *start)
 {
     struct smbios_type_0 *p = (struct smbios_type_0 *)start;
+    char *end = (char *)start + sizeof(struct smbios_type_0);
+    size_t size;
+    int str_index = 0;
 
     p->header.type = 0;
     p->header.length = sizeof(struct smbios_type_0);
     p->header.handle = 0;
 
-    p->vendor_str = 1;
-    p->bios_version_str = 1;
+    load_str_field_with_default(0, vendor_str, CONFIG_APPNAME);
+    load_str_field_with_default(0, bios_version_str, CONFIG_APPNAME);
+
     p->bios_starting_address_segment = 0xe800;
-    p->bios_release_date_str = 2;
+
+    load_str_field_with_default(0, bios_release_date_str, RELEASE_DATE_STR);
+
     p->bios_rom_size = 0; /* FIXME */
 
-    memset(p->bios_characteristics, 0, sizeof(p->bios_characteristics));
+    memset(p->bios_characteristics, 0, 8);
     p->bios_characteristics[0] = 0x08; /* BIOS characteristics not supported */
     p->bios_characteristics_extension_bytes[0] = 0;
     p->bios_characteristics_extension_bytes[1] = 0;
 
-    p->system_bios_major_release = 1;
-    p->system_bios_minor_release = 0;
+    if (!qemu_cfg_smbios_load_field(0, offsetof(struct smbios_type_0,
+                                                system_bios_major_release),
+                                    &p->system_bios_major_release))
+        p->system_bios_major_release = 1;
+
+    if (!qemu_cfg_smbios_load_field(0, offsetof(struct smbios_type_0,
+                                                system_bios_minor_release),
+                                    &p->system_bios_minor_release))
+        p->system_bios_minor_release = 0;
+
     p->embedded_controller_major_release = 0xff;
     p->embedded_controller_minor_release = 0xff;
 
-    start += sizeof(struct smbios_type_0);
-    memcpy((char *)start, CONFIG_APPNAME, sizeof(CONFIG_APPNAME));
-    start += sizeof(CONFIG_APPNAME);
-    memcpy((char *)start, RELEASE_DATE_STR, sizeof(RELEASE_DATE_STR));
-    start += sizeof(RELEASE_DATE_STR);
-    *((u8 *)start) = 0;
+    *end = 0;
+    end++;
 
-    return start+1;
+    return end;
 }
 
 /* Type 1 -- System Information */
 static void *
-smbios_type_1_init(void *start)
+smbios_init_type_1(void *start)
 {
     struct smbios_type_1 *p = (struct smbios_type_1 *)start;
+    char *end = (char *)start + sizeof(struct smbios_type_1);
+    size_t size;
+    int str_index = 0;
+
     p->header.type = 1;
     p->header.length = sizeof(struct smbios_type_1);
     p->header.handle = 0x100;
 
-    p->manufacturer_str = 0;
-    p->product_name_str = 0;
-    p->version_str = 0;
-    p->serial_number_str = 0;
+    load_str_field_or_skip(1, manufacturer_str);
+    load_str_field_or_skip(1, product_name_str);
+    load_str_field_or_skip(1, version_str);
+    load_str_field_or_skip(1, serial_number_str);
 
-    uuid_probe(p->uuid);
+    size = qemu_cfg_smbios_load_field(1, offsetof(struct smbios_type_1,
+                                                  uuid), &p->uuid);
+    if (size == 0)
+        memset(p->uuid, 0, 16);
 
     p->wake_up_type = 0x06; /* power switch */
-    p->sku_number_str = 0;
-    p->family_str = 0;
 
-    start += sizeof(struct smbios_type_1);
-    *((u16 *)start) = 0;
+    load_str_field_or_skip(1, sku_number_str);
+    load_str_field_or_skip(1, family_str);
 
-    return start+2;
+    *end = 0;
+    end++;
+    if (!str_index) {
+        *end = 0;
+        end++;
+    }
+
+    return end;
 }
 
 /* Type 3 -- System Enclosure */
 static void *
-smbios_type_3_init(void *start)
+smbios_init_type_3(void *start)
 {
     struct smbios_type_3 *p = (struct smbios_type_3 *)start;
 
@@ -324,7 +354,7 @@ smbios_type_3_init(void *start)
 
 /* Type 4 -- Processor Information */
 static void *
-smbios_type_4_init(void *start, unsigned int cpu_number)
+smbios_init_type_4(void *start, unsigned int cpu_number)
 {
     struct smbios_type_4 *p = (struct smbios_type_4 *)start;
 
@@ -366,7 +396,7 @@ smbios_type_4_init(void *start, unsigned int cpu_number)
 
 /* Type 16 -- Physical Memory Array */
 static void *
-smbios_type_16_init(void *start, u32 memory_size_mb, int nr_mem_devs)
+smbios_init_type_16(void *start, u32 memory_size_mb, int nr_mem_devs)
 {
     struct smbios_type_16 *p = (struct smbios_type_16*)start;
 
@@ -389,7 +419,7 @@ smbios_type_16_init(void *start, u32 memory_size_mb, int nr_mem_devs)
 
 /* Type 17 -- Memory Device */
 static void *
-smbios_type_17_init(void *start, u32 memory_size_mb, int instance)
+smbios_init_type_17(void *start, u32 memory_size_mb, int instance)
 {
     struct smbios_type_17 *p = (struct smbios_type_17 *)start;
 
@@ -420,7 +450,7 @@ smbios_type_17_init(void *start, u32 memory_size_mb, int instance)
 
 /* Type 19 -- Memory Array Mapped Address */
 static void *
-smbios_type_19_init(void *start, u32 memory_size_mb, int instance)
+smbios_init_type_19(void *start, u32 memory_size_mb, int instance)
 {
     struct smbios_type_19 *p = (struct smbios_type_19 *)start;
 
@@ -441,7 +471,7 @@ smbios_type_19_init(void *start, u32 memory_size_mb, int instance)
 
 /* Type 20 -- Memory Device Mapped Address */
 static void *
-smbios_type_20_init(void *start, u32 memory_size_mb, int instance)
+smbios_init_type_20(void *start, u32 memory_size_mb, int instance)
 {
     struct smbios_type_20 *p = (struct smbios_type_20 *)start;
 
@@ -465,7 +495,7 @@ smbios_type_20_init(void *start, u32 memory_size_mb, int instance)
 
 /* Type 32 -- System Boot Information */
 static void *
-smbios_type_32_init(void *start)
+smbios_init_type_32(void *start)
 {
     struct smbios_type_32 *p = (struct smbios_type_32 *)start;
 
@@ -483,7 +513,7 @@ smbios_type_32_init(void *start)
 
 /* Type 127 -- End of Table */
 static void *
-smbios_type_127_init(void *start)
+smbios_init_type_127(void *start)
 {
     struct smbios_type_127 *p = (struct smbios_type_127 *)start;
 
@@ -514,20 +544,25 @@ smbios_init(void)
     u32 nr_structs = 0, max_struct_size = 0;
     char *q, *p = start;
 
-#define add_struct(fn) { \
-    q = (fn); \
-    nr_structs++; \
-    if ((q - p) > max_struct_size) \
-        max_struct_size = q - p; \
-    p = q; \
-}
+#define add_struct(type, args...)                                       \
+    do {                                                                \
+        if (!qemu_cfg_smbios_load_external(type, &p, &nr_structs,       \
+                                           &max_struct_size)) {         \
+            q = smbios_init_type_##type(args);                          \
+            nr_structs++;                                               \
+            if ((q - p) > max_struct_size)                              \
+                max_struct_size = q - p;                                \
+            p = q;                                                      \
+        }                                                               \
+    } while (0)
+
+    add_struct(0, p);
+    add_struct(1, p);
+    add_struct(3, p);
 
-    add_struct(smbios_type_0_init(p));
-    add_struct(smbios_type_1_init(p));
-    add_struct(smbios_type_3_init(p));
     int cpu_num, smp_cpus = CountCPUs;
     for (cpu_num = 1; cpu_num <= smp_cpus; cpu_num++)
-        add_struct(smbios_type_4_init(p, cpu_num));
+        add_struct(4, p, cpu_num);
     u64 memsize = RamSizeOver4G;
     if (memsize)
         memsize += 0x100000000ull;
@@ -535,17 +570,21 @@ smbios_init(void)
         memsize = RamSize;
     memsize = memsize / (1024 * 1024);
     int nr_mem_devs = (memsize + 0x3fff) >> 14;
-    add_struct(smbios_type_16_init(p, memsize, nr_mem_devs));
+    add_struct(16, p, memsize, nr_mem_devs);
     int i;
     for (i = 0; i < nr_mem_devs; i++) {
         u32 dev_memsize = ((i == (nr_mem_devs - 1))
                            ? (((memsize-1) & 0x3fff)+1) : 0x4000);
-        add_struct(smbios_type_17_init(p, dev_memsize, i));
-        add_struct(smbios_type_19_init(p, dev_memsize, i));
-        add_struct(smbios_type_20_init(p, dev_memsize, i));
+        add_struct(17, p, dev_memsize, i);
+        add_struct(19, p, dev_memsize, i);
+        add_struct(20, p, dev_memsize, i);
     }
-    add_struct(smbios_type_32_init(p));
-    add_struct(smbios_type_127_init(p));
+
+    add_struct(32, p);
+    /* Add any remaining provided entries before the end marker */
+    for (i = 0; i < 256; i++)
+        qemu_cfg_smbios_load_external(i, &p, &nr_structs, &max_struct_size);
+    add_struct(127, p);
 
 #undef add_struct
 
-- 
1.6.3.3

[Qemu-devel] Re: [PATCH 1/2] resolve memory device roll over reporting issues with >32G guests

[Kevin O'Connor]

On Wed, Oct 07, 2009 at 06:16:50PM +0200, Gleb Natapov wrote:
> The field within the Memory Device type 17 is only a word with the MSB being
> used to report MB/KB.  Thereby, a guest with 32G and greater would report
> incorrect memory device information rolling over to 0.
> 
> This presents more than one memory device and associated memory structures
> if the memory is larger than 16G
> 
> This is port of commit e65bb0d2bd3a156408996674965555979de3a61b
> from qemu pc-bios tree.
> 
> Signed-off-by: Gleb Natapov <gleb@redhat.com>

Thanks - commit 2a3dfea751feba22dafff7b8d8b20c1f75cc0389

-Kevin

[Qemu-devel] Re: [PATCH 2/2] Load SMBIOS entries and files from qemu

[Kevin O'Connor]

On Wed, Oct 07, 2009 at 06:16:51PM +0200, Gleb Natapov wrote:
> Allow SMBIOS fields to be overridden and entries replaced by those
> read from qemu.
> 
> This is port of commit f4a09e759469be74e2598758bfae623b555c4cae
> from qemu pc-bios tree.
> 
> Signed-off-by: Gleb Natapov <gleb@redhat.com>

Two comments:

The smbios code is allocating 2K of high ram for the full table.  Now
that tables can be pulled in from qemu, is it assured that the space
wont overflow?

[...]
> +#define load_str_field_with_default(type, field, def)                   \
[...]

These macros are really ugly - isn't there a better way to do this?

-Kevin

[Qemu-devel] Re: [PATCH 2/2] Load SMBIOS entries and files from qemu

[Gleb Natapov]

On Wed, Oct 07, 2009 at 07:53:26PM -0400, Kevin O'Connor wrote:
> On Wed, Oct 07, 2009 at 06:16:51PM +0200, Gleb Natapov wrote:
> > Allow SMBIOS fields to be overridden and entries replaced by those
> > read from qemu.
> > 
> > This is port of commit f4a09e759469be74e2598758bfae623b555c4cae
> > from qemu pc-bios tree.
> > 
> > Signed-off-by: Gleb Natapov <gleb@redhat.com>
> 
> Two comments:
> 
> The smbios code is allocating 2K of high ram for the full table.  Now
> that tables can be pulled in from qemu, is it assured that the space
> wont overflow?
No it is not. We should check this is and stop table loading on overflow.

> 
> [...]
> > +#define load_str_field_with_default(type, field, def)                   \
> [...]
> 
> These macros are really ugly - isn't there a better way to do this?
> 
This is direct port from qemu pcbios, so there the code is exactly the
same if it makes you feel better :) Otherwise I agree with you that
smbios table could have been done easier, but existing qemu-to-bios
interface dictates this complex implementation. I don't see how can we get
rid of this macros. Without them we will have to open code the same
logic in every place they are used. 

--
			Gleb.