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QEMU e820 reservation patch 

Hi,

Kevin and I have agreed on the approach for this one now. So here is
the latest version of the patch for QEMU, submitting e820 reservation
entries via fw_cfg.

Cheers,
Jes

Use qemu-cfg to provide the BIOS with an optional table of e820 entries.

Notify the BIOS of the location of the TSS+EPT range to by reserving
it via the e820 table.

This matches a corresponding patch for Seabios, however older versions
of Seabios will default to the hardcoded address range and stay
compatible with current QEMU.

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Jes Sorensen 2010-02-15 18:33:46 +01:00 committed by Anthony Liguori
parent ed487bb1d6
commit 4c5b10b7b6
3 changed files with 53 additions and 0 deletions
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35
hw/pc.c
View File

@ -59,6 +59,7 @@
#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 MAX_IDE_BUS 2
@ -67,6 +68,21 @@ static RTCState *rtc_state;
static PITState *pit;
static PCII440FXState *i440fx_state;
#define E820_NR_ENTRIES 16
struct e820_entry {
uint64_t address;
uint64_t length;
uint32_t type;
};
struct e820_table {
uint32_t count;
struct e820_entry entry[E820_NR_ENTRIES];
};
static struct e820_table e820_table;
typedef struct isa_irq_state {
qemu_irq *i8259;
qemu_irq *ioapic;
@ -435,6 +451,23 @@ static void bochs_bios_write(void *opaque, uint32_t addr, uint32_t val)
}
}
int e820_add_entry(uint64_t address, uint64_t length, uint32_t type)
{
int index = e820_table.count;
struct e820_entry *entry;
if (index >= E820_NR_ENTRIES)
return -EBUSY;
entry = &e820_table.entry[index];
entry->address = address;
entry->length = length;
entry->type = type;
e820_table.count++;
return e820_table.count;
}
static void *bochs_bios_init(void)
{
void *fw_cfg;
@ -466,6 +499,8 @@ static void *bochs_bios_init(void)
if (smbios_table)
fw_cfg_add_bytes(fw_cfg, FW_CFG_SMBIOS_ENTRIES,
smbios_table, smbios_len);
fw_cfg_add_bytes(fw_cfg, FW_CFG_E820_TABLE, (uint8_t *)&e820_table,
sizeof(struct e820_table));
/* allocate memory for the NUMA channel: one (64bit) word for the number
* of nodes, one word for each VCPU->node and one word for each node to

10
hw/pc.h
View File

@ -150,4 +150,14 @@ void isa_cirrus_vga_init(void);
void isa_ne2000_init(int base, int irq, NICInfo *nd);
int cpu_is_bsp(CPUState *env);
/* e820 types */
#define E820_RAM 1
#define E820_RESERVED 2
#define E820_ACPI 3
#define E820_NVS 4
#define E820_UNUSABLE 5
int e820_add_entry(uint64_t, uint64_t, uint32_t);
#endif

8
target-i386/kvm.c
View File

@ -24,6 +24,7 @@
#include "cpu.h"
#include "gdbstub.h"
#include "host-utils.h"
#include "hw/pc.h"
#ifdef CONFIG_KVM_PARA
#include <linux/kvm_para.h>
@ -362,6 +363,13 @@ int kvm_arch_init(KVMState *s, int smp_cpus)
* as unavaible memory. FIXME, need to ensure the e820 map deals with
* this?
*/
/*
* Tell fw_cfg to notify the BIOS to reserve the range.
*/
if (e820_add_entry(0xfffbc000, 0x4000, E820_RESERVED) < 0) {
perror("e820_add_entry() table is full");
exit(1);
}
return kvm_vm_ioctl(s, KVM_SET_TSS_ADDR, 0xfffbd000);
}