Dimm physical address offsets are calculated automatically and memory map is
adjusted accordingly. If a DIMM can fit before the PCI_HOLE_START (currently
0xe0000000), it will be added normally, otherwise its physical address will be
above 4GB.
Signed-off-by: Vasilis Liaskovitis <vasilis.liaskovi...@profitbricks.com>
---
hw/pc.c | 41 +++++++++++++++++++++++++++++++++++++++++
hw/pc.h | 6 ++++++
hw/pc_piix.c | 18 ++++++++++++------
vl.c | 1 +
4 files changed, 60 insertions(+), 6 deletions(-)
diff --git a/hw/pc.c b/hw/pc.c
index c7e9ab3..ef9901a 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -48,6 +48,7 @@
#include "memory.h"
#include "exec-memory.h"
#include "arch_init.h"
+#include "dimm.h"
/* output Bochs bios info messages */
//#define DEBUG_BIOS
@@ -89,6 +90,9 @@ struct e820_table {
static struct e820_table e820_table;
struct hpet_fw_config hpet_cfg = {.count = UINT8_MAX};
+ram_addr_t below_4g_hp_mem_size = 0;
+ram_addr_t above_4g_hp_mem_size = 0;
+extern target_phys_addr_t ram_hp_offset;
void gsi_handler(void *opaque, int n, int level)
{
GSIState *s = opaque;
@@ -1182,3 +1186,40 @@ void pc_pci_device_init(PCIBus *pci_bus)
pci_create_simple(pci_bus, -1, "lsi53c895a");
}
}
+
+
+/* Function to configure memory offsets of hotpluggable dimms */
+
+target_phys_addr_t pc_set_hp_memory_offset(uint64_t size)
+{
+ target_phys_addr_t ret;
+
+ /* on first call, initialize ram_hp_offset */
+ if (!ram_hp_offset) {
+ if (ram_size >= PCI_HOLE_START ) {
+ ram_hp_offset = 0x100000000LL + (ram_size - PCI_HOLE_START);
+ } else {
+ ram_hp_offset = ram_size;
+ }
+ }
+
+ if (ram_hp_offset >= 0x100000000LL) {
+ ret = ram_hp_offset;
+ above_4g_hp_mem_size += size;
+ ram_hp_offset += size;
+ }
+ /* if dimm fits before pci hole, append it normally */
+ else if (ram_hp_offset + size <= PCI_HOLE_START) {
+ ret = ram_hp_offset;
+ below_4g_hp_mem_size += size;
+ ram_hp_offset += size;
+ }
+ /* otherwise place it above 4GB */
+ else {
+ ret = 0x100000000LL;
+ above_4g_hp_mem_size += size;
+ ram_hp_offset = 0x100000000LL + size;
+ }
+
+ return ret;
+}
diff --git a/hw/pc.h b/hw/pc.h
index 31ccb6f..15bdd7d 100644
--- a/hw/pc.h
+++ b/hw/pc.h
@@ -10,6 +10,7 @@
#include "memory.h"
#include "ioapic.h"
+#define PCI_HOLE_START 0xe0000000
/* PC-style peripherals (also used by other machines). */
/* serial.c */
@@ -218,6 +219,11 @@ static inline bool isa_ne2000_init(ISABus *bus, int base,
int irq, NICInfo *nd)
/* pc_sysfw.c */
void pc_system_firmware_init(MemoryRegion *rom_memory);
+/* memory hotplug */
+target_phys_addr_t pc_set_hp_memory_offset(uint64_t size);
+extern ram_addr_t below_4g_hp_mem_size;
+extern ram_addr_t above_4g_hp_mem_size;
+
/* e820 types */
#define E820_RAM 1
#define E820_RESERVED 2
diff --git a/hw/pc_piix.c b/hw/pc_piix.c
index 0c0096f..f3f1651 100644
--- a/hw/pc_piix.c
+++ b/hw/pc_piix.c
@@ -43,6 +43,7 @@
#include "xen.h"
#include "memory.h"
#include "exec-memory.h"
+#include "dimm.h"
#ifdef CONFIG_XEN
# include <xen/hvm/hvm_info_table.h>
#endif
@@ -155,9 +156,9 @@ static void pc_init1(MemoryRegion *system_memory,
kvmclock_create();
}
- if (ram_size >= 0xe0000000 ) {
- above_4g_mem_size = ram_size - 0xe0000000;
- below_4g_mem_size = 0xe0000000;
+ if (ram_size >= PCI_HOLE_START ) {
+ above_4g_mem_size = ram_size - PCI_HOLE_START;
+ below_4g_mem_size = PCI_HOLE_START;
} else {
above_4g_mem_size = 0;
below_4g_mem_size = ram_size;
@@ -172,6 +173,9 @@ static void pc_init1(MemoryRegion *system_memory,
rom_memory = system_memory;
}
+ /* adjust memory map for hotplug dimms */
+ dimm_calc_offsets(pc_set_hp_memory_offset);
+
/* allocate ram and load rom/bios */
if (!xen_enabled()) {
fw_cfg = pc_memory_init(system_memory,
@@ -192,9 +196,11 @@ static void pc_init1(MemoryRegion *system_memory,
if (pci_enabled) {
pci_bus = i440fx_init(&i440fx_state, &piix3_devfn, &isa_bus, gsi,
system_memory, system_io, ram_size,
- below_4g_mem_size,
- 0x100000000ULL - below_4g_mem_size,
- 0x100000000ULL + above_4g_mem_size,
+ below_4g_mem_size + below_4g_hp_mem_size,
+ 0x100000000ULL - below_4g_mem_size
+ - below_4g_hp_mem_size,
+ 0x100000000ULL + above_4g_mem_size
+ + above_4g_hp_mem_size,
(sizeof(target_phys_addr_t) == 4
? 0
: ((uint64_t)1 << 62)),
diff --git a/vl.c b/vl.c
index 1329c30..0ff8818 100644
--- a/vl.c
+++ b/vl.c
@@ -176,6 +176,7 @@ DisplayType display_type = DT_DEFAULT;
int display_remote = 0;
const char* keyboard_layout = NULL;
ram_addr_t ram_size;
+ram_addr_t ram_hp_offset;
const char *mem_path = NULL;
#ifdef MAP_POPULATE
int mem_prealloc = 0; /* force preallocation of physical target memory */
--
1.7.9
--
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