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-rw-r--r--hw/i386/acpi-dsdt-cpu-hotplug.dsl1
-rw-r--r--hw/i386/pc_piix.c19
-rw-r--r--hw/i386/pc_sysfw.c105
-rw-r--r--hw/i386/q35-acpi-dsdt.dsl4
4 files changed, 105 insertions, 24 deletions
diff --git a/hw/i386/acpi-dsdt-cpu-hotplug.dsl b/hw/i386/acpi-dsdt-cpu-hotplug.dsl
index c96ac42..995b415 100644
--- a/hw/i386/acpi-dsdt-cpu-hotplug.dsl
+++ b/hw/i386/acpi-dsdt-cpu-hotplug.dsl
@@ -52,7 +52,6 @@ Scope(\_SB) {
Sleep(200)
}
- /* CPU hotplug notify method */
OperationRegion(PRST, SystemIO, 0xaf00, 32)
Field(PRST, ByteAcc, NoLock, Preserve) {
PRS, 256
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 4e0dae7..2766414 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -61,6 +61,11 @@ static const int ide_irq[MAX_IDE_BUS] = { 14, 15 };
static bool has_pci_info;
static bool has_acpi_build = true;
static bool smbios_type1_defaults = true;
+/* Make sure that guest addresses aligned at 1Gbyte boundaries get mapped to
+ * host addresses aligned at 1Gbyte boundaries. This way we can use 1GByte
+ * pages in the host.
+ */
+static bool gigabyte_align = true;
/* PC hardware initialisation */
static void pc_init1(QEMUMachineInitArgs *args,
@@ -106,9 +111,17 @@ static void pc_init1(QEMUMachineInitArgs *args,
kvmclock_create();
}
+ /* Check whether RAM fits below 4G (leaving 1/2 GByte for IO memory).
+ * If it doesn't, we need to split it in chunks below and above 4G.
+ * In any case, try to make sure that guest addresses aligned at
+ * 1G boundaries get mapped to host addresses aligned at 1G boundaries.
+ * For old machine types, use whatever split we used historically to avoid
+ * breaking migration.
+ */
if (args->ram_size >= 0xe0000000) {
- above_4g_mem_size = args->ram_size - 0xe0000000;
- below_4g_mem_size = 0xe0000000;
+ ram_addr_t lowmem = gigabyte_align ? 0xc0000000 : 0xe0000000;
+ above_4g_mem_size = args->ram_size - lowmem;
+ below_4g_mem_size = lowmem;
} else {
above_4g_mem_size = 0;
below_4g_mem_size = args->ram_size;
@@ -157,6 +170,7 @@ static void pc_init1(QEMUMachineInitArgs *args,
if (pci_enabled) {
pci_bus = i440fx_init(&i440fx_state, &piix3_devfn, &isa_bus, gsi,
system_memory, system_io, args->ram_size,
+ below_4g_mem_size,
above_4g_mem_size,
pci_memory, ram_memory);
} else {
@@ -245,6 +259,7 @@ static void pc_init_pci(QEMUMachineInitArgs *args)
static void pc_compat_1_7(QEMUMachineInitArgs *args)
{
smbios_type1_defaults = false;
+ gigabyte_align = false;
}
static void pc_compat_1_6(QEMUMachineInitArgs *args)
diff --git a/hw/i386/pc_sysfw.c b/hw/i386/pc_sysfw.c
index e917c83..75a7ebba 100644
--- a/hw/i386/pc_sysfw.c
+++ b/hw/i386/pc_sysfw.c
@@ -72,35 +72,102 @@ static void pc_isa_bios_init(MemoryRegion *rom_memory,
memory_region_set_readonly(isa_bios, true);
}
-static void pc_system_flash_init(MemoryRegion *rom_memory,
- DriveInfo *pflash_drv)
+#define FLASH_MAP_UNIT_MAX 2
+
+/* We don't have a theoretically justifiable exact lower bound on the base
+ * address of any flash mapping. In practice, the IO-APIC MMIO range is
+ * [0xFEE00000..0xFEE01000[ -- see IO_APIC_DEFAULT_ADDRESS --, leaving free
+ * only 18MB-4KB below 4G. For now, restrict the cumulative mapping to 8MB in
+ * size.
+ */
+#define FLASH_MAP_BASE_MIN ((hwaddr)(0x100000000ULL - 8*1024*1024))
+
+/* This function maps flash drives from 4G downward, in order of their unit
+ * numbers. The mapping starts at unit#0, with unit number increments of 1, and
+ * stops before the first missing flash drive, or before
+ * unit#FLASH_MAP_UNIT_MAX, whichever is reached first.
+ *
+ * Addressing within one flash drive is of course not reversed.
+ *
+ * An error message is printed and the process exits if:
+ * - the size of the backing file for a flash drive is non-positive, or not a
+ * multiple of the required sector size, or
+ * - the current mapping's base address would fall below FLASH_MAP_BASE_MIN.
+ *
+ * The drive with unit#0 (if available) is mapped at the highest address, and
+ * it is passed to pc_isa_bios_init(). Merging several drives for isa-bios is
+ * not supported.
+ */
+static void pc_system_flash_init(MemoryRegion *rom_memory)
{
+ int unit;
+ DriveInfo *pflash_drv;
BlockDriverState *bdrv;
int64_t size;
- hwaddr phys_addr;
+ char *fatal_errmsg = NULL;
+ hwaddr phys_addr = 0x100000000ULL;
int sector_bits, sector_size;
pflash_t *system_flash;
MemoryRegion *flash_mem;
+ char name[64];
- bdrv = pflash_drv->bdrv;
- size = bdrv_getlength(pflash_drv->bdrv);
sector_bits = 12;
sector_size = 1 << sector_bits;
- if ((size % sector_size) != 0) {
- fprintf(stderr,
- "qemu: PC system firmware (pflash) must be a multiple of 0x%x\n",
- sector_size);
- exit(1);
+ for (unit = 0;
+ (unit < FLASH_MAP_UNIT_MAX &&
+ (pflash_drv = drive_get(IF_PFLASH, 0, unit)) != NULL);
+ ++unit) {
+ bdrv = pflash_drv->bdrv;
+ size = bdrv_getlength(bdrv);
+ if (size < 0) {
+ fatal_errmsg = g_strdup_printf("failed to get backing file size");
+ } else if (size == 0) {
+ fatal_errmsg = g_strdup_printf("PC system firmware (pflash) "
+ "cannot have zero size");
+ } else if ((size % sector_size) != 0) {
+ fatal_errmsg = g_strdup_printf("PC system firmware (pflash) "
+ "must be a multiple of 0x%x", sector_size);
+ } else if (phys_addr < size || phys_addr - size < FLASH_MAP_BASE_MIN) {
+ fatal_errmsg = g_strdup_printf("oversized backing file, pflash "
+ "segments cannot be mapped under "
+ TARGET_FMT_plx, FLASH_MAP_BASE_MIN);
+ }
+ if (fatal_errmsg != NULL) {
+ Location loc;
+
+ /* push a new, "none" location on the location stack; overwrite its
+ * contents with the location saved in the option; print the error
+ * (includes location); pop the top
+ */
+ loc_push_none(&loc);
+ if (pflash_drv->opts != NULL) {
+ qemu_opts_loc_restore(pflash_drv->opts);
+ }
+ error_report("%s", fatal_errmsg);
+ loc_pop(&loc);
+ g_free(fatal_errmsg);
+ exit(1);
+ }
+
+ phys_addr -= size;
+
+ /* pflash_cfi01_register() creates a deep copy of the name */
+ snprintf(name, sizeof name, "system.flash%d", unit);
+ system_flash = pflash_cfi01_register(phys_addr, NULL /* qdev */, name,
+ size, bdrv, sector_size,
+ size >> sector_bits,
+ 1 /* width */,
+ 0x0000 /* id0 */,
+ 0x0000 /* id1 */,
+ 0x0000 /* id2 */,
+ 0x0000 /* id3 */,
+ 0 /* be */);
+ if (unit == 0) {
+ flash_mem = pflash_cfi01_get_memory(system_flash);
+ pc_isa_bios_init(rom_memory, flash_mem, size);
+ }
}
-
- phys_addr = 0x100000000ULL - size;
- system_flash = pflash_cfi01_register(phys_addr, NULL, "system.flash", size,
- bdrv, sector_size, size >> sector_bits,
- 1, 0x0000, 0x0000, 0x0000, 0x0000, 0);
- flash_mem = pflash_cfi01_get_memory(system_flash);
-
- pc_isa_bios_init(rom_memory, flash_mem, size);
}
static void old_pc_system_rom_init(MemoryRegion *rom_memory, bool isapc_ram_fw)
@@ -181,5 +248,5 @@ void pc_system_firmware_init(MemoryRegion *rom_memory, bool isapc_ram_fw)
exit(1);
}
- pc_system_flash_init(rom_memory, pflash_drv);
+ pc_system_flash_init(rom_memory);
}
diff --git a/hw/i386/q35-acpi-dsdt.dsl b/hw/i386/q35-acpi-dsdt.dsl
index 575c5d7..7934a9d 100644
--- a/hw/i386/q35-acpi-dsdt.dsl
+++ b/hw/i386/q35-acpi-dsdt.dsl
@@ -417,11 +417,11 @@ DefinitionBlock (
Method(_L00) {
}
Method(_L01) {
+ }
+ Method(_E02) {
// CPU hotplug event
\_SB.PRSC()
}
- Method(_L02) {
- }
Method(_L03) {
}
Method(_L04) {
generated by cgit v1.1 at 2024-12-28 02:36:02 +0000