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hw/i386/e820: remove legacy reserved entries for e820

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e820 reserved entries were used before the dynamic entries with fw config files
were intoduced. Please see the following change:
7d67110f2d9a6("pc: add etc/e820 fw_cfg file")

Identical support was introduced into seabios as well with the following commit:
ce39bd4031820 ("Add support for etc/e820 fw_cfg file")

Both the above commits are now quite old. QEMU machines 1.7 and newer no longer
use the reserved entries. Seabios uses fw config files and
dynamic e820 entries by default and only falls back to using reserved entries
when it has to work with old qemu (versions earlier than 1.7). Please see
functions qemu_cfg_e820() and qemu_early_e820(). It is safe to remove legacy
FW_CFG_E820_TABLE and associated code now as QEMU 7.0 has deprecated i440fx
machines 1.7 and older. It would be incredibly rare to run the latest qemu
version with a very old version of seabios that did not support fw config files
for e820.

As far as I could see, edk2/ovfm never supported reserved entries and uses fw
config files from the beginning. So there should be no incompatibilities with
ovfm as well.

CC: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Ani Sinha <ani@anisinha.ca>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Message-Id: <20220831045311.33083-1-ani@anisinha.ca>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Ani Sinha 2022-08-31 10:23:10 +05:30 committed by Michael S. Tsirkin
parent a11f65ec1b
commit 4ad08e8a57
5 changed files with 1 additions and 33 deletions
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20
hw/i386/e820_memory_layout.c
View File

@ -11,29 +11,11 @@
#include "e820_memory_layout.h"
static size_t e820_entries;
struct e820_table e820_reserve;
struct e820_entry *e820_table;
int e820_add_entry(uint64_t address, uint64_t length, uint32_t type)
{
int index = le32_to_cpu(e820_reserve.count);
struct e820_entry *entry;
if (type != E820_RAM) {
/* old FW_CFG_E820_TABLE entry -- reservations only */
if (index >= E820_NR_ENTRIES) {
return -EBUSY;
}
entry = &e820_reserve.entry[index++];
entry->address = cpu_to_le64(address);
entry->length = cpu_to_le64(length);
entry->type = cpu_to_le32(type);
e820_reserve.count = cpu_to_le32(index);
}
/* new "etc/e820" file -- include ram too */
/* new "etc/e820" file -- include ram and reserved entries */
e820_table = g_renew(struct e820_entry, e820_table, e820_entries + 1);
e820_table[e820_entries].address = cpu_to_le64(address);
e820_table[e820_entries].length = cpu_to_le64(length);

8
hw/i386/e820_memory_layout.h
View File

@ -16,20 +16,12 @@
#define E820_NVS 4
#define E820_UNUSABLE 5
#define E820_NR_ENTRIES 16
struct e820_entry {
uint64_t address;
uint64_t length;
uint32_t type;
} QEMU_PACKED __attribute((__aligned__(4)));
struct e820_table {
uint32_t count;
struct e820_entry entry[E820_NR_ENTRIES];
} QEMU_PACKED __attribute((__aligned__(4)));
extern struct e820_table e820_reserve;
extern struct e820_entry *e820_table;
int e820_add_entry(uint64_t address, uint64_t length, uint32_t type);

3
hw/i386/fw_cfg.c
View File

@ -36,7 +36,6 @@ const char *fw_cfg_arch_key_name(uint16_t key)
{FW_CFG_ACPI_TABLES, "acpi_tables"},
{FW_CFG_SMBIOS_ENTRIES, "smbios_entries"},
{FW_CFG_IRQ0_OVERRIDE, "irq0_override"},
{FW_CFG_E820_TABLE, "e820_table"},
{FW_CFG_HPET, "hpet"},
};
@ -127,8 +126,6 @@ FWCfgState *fw_cfg_arch_create(MachineState *ms,
#endif
fw_cfg_add_i32(fw_cfg, FW_CFG_IRQ0_OVERRIDE, 1);
fw_cfg_add_bytes(fw_cfg, FW_CFG_E820_TABLE,
&e820_reserve, sizeof(e820_reserve));
fw_cfg_add_file(fw_cfg, "etc/e820", e820_table,
sizeof(struct e820_entry) * e820_get_num_entries());

1
hw/i386/fw_cfg.h
View File

@ -17,7 +17,6 @@
#define FW_CFG_ACPI_TABLES (FW_CFG_ARCH_LOCAL + 0)
#define FW_CFG_SMBIOS_ENTRIES (FW_CFG_ARCH_LOCAL + 1)
#define FW_CFG_IRQ0_OVERRIDE (FW_CFG_ARCH_LOCAL + 2)
#define FW_CFG_E820_TABLE (FW_CFG_ARCH_LOCAL + 3)
#define FW_CFG_HPET (FW_CFG_ARCH_LOCAL + 4)
FWCfgState *fw_cfg_arch_create(MachineState *ms,

2
hw/i386/microvm.c
View File

@ -324,8 +324,6 @@ static void microvm_memory_init(MicrovmMachineState *mms)
fw_cfg_add_i16(fw_cfg, FW_CFG_MAX_CPUS, machine->smp.max_cpus);
fw_cfg_add_i64(fw_cfg, FW_CFG_RAM_SIZE, (uint64_t)machine->ram_size);
fw_cfg_add_i32(fw_cfg, FW_CFG_IRQ0_OVERRIDE, 1);
fw_cfg_add_bytes(fw_cfg, FW_CFG_E820_TABLE,
&e820_reserve, sizeof(e820_reserve));
fw_cfg_add_file(fw_cfg, "etc/e820", e820_table,
sizeof(struct e820_entry) * e820_get_num_entries());