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target/i386: use DMA-enabled multiboot ROM for new-enough QEMU machine types

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As long as fw_cfg supports DMA, the new ROM can be used also on older
machine types because it has the same size as the existing one.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2021-10-20 15:59:44 +02:00
parent 48972f8cad
commit 3ca8ce720f
4 changed files with 14 additions and 5 deletions
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10
hw/i386/multiboot.c
View File

@ -143,7 +143,8 @@ static void mb_add_mod(MultibootState *s,
s->mb_mods_count++;
}
int load_multiboot(FWCfgState *fw_cfg,
int load_multiboot(X86MachineState *x86ms,
FWCfgState *fw_cfg,
FILE *f,
const char *kernel_filename,
const char *initrd_filename,
@ -151,6 +152,7 @@ int load_multiboot(FWCfgState *fw_cfg,
int kernel_file_size,
uint8_t *header)
{
bool multiboot_dma_enabled = X86_MACHINE_GET_CLASS(x86ms)->fwcfg_dma_enabled;
int i, is_multiboot = 0;
uint32_t flags = 0;
uint32_t mh_entry_addr;
@ -401,7 +403,11 @@ int load_multiboot(FWCfgState *fw_cfg,
fw_cfg_add_bytes(fw_cfg, FW_CFG_INITRD_DATA, mb_bootinfo_data,
sizeof(bootinfo));
option_rom[nb_option_roms].name = "multiboot.bin";
if (multiboot_dma_enabled) {
option_rom[nb_option_roms].name = "multiboot_dma.bin";
} else {
option_rom[nb_option_roms].name = "multiboot.bin";
}
option_rom[nb_option_roms].bootindex = 0;
nb_option_roms++;

4
hw/i386/multiboot.h
View File

@ -2,8 +2,10 @@
#define QEMU_MULTIBOOT_H
#include "hw/nvram/fw_cfg.h"
#include "hw/i386/x86.h"
int load_multiboot(FWCfgState *fw_cfg,
int load_multiboot(X86MachineState *x86ms,
FWCfgState *fw_cfg,
FILE *f,
const char *kernel_filename,
const char *initrd_filename,

3
hw/i386/pc.c
View File

@ -780,7 +780,8 @@ void xen_load_linux(PCMachineState *pcms)
assert(!strcmp(option_rom[i].name, "linuxboot.bin") ||
!strcmp(option_rom[i].name, "linuxboot_dma.bin") ||
!strcmp(option_rom[i].name, "pvh.bin") ||
!strcmp(option_rom[i].name, "multiboot.bin"));
!strcmp(option_rom[i].name, "multiboot.bin") ||
!strcmp(option_rom[i].name, "multiboot_dma.bin"));
rom_add_option(option_rom[i].name, option_rom[i].bootindex);
}
x86ms->fw_cfg = fw_cfg;

2
hw/i386/x86.c
View File

@ -814,7 +814,7 @@ void x86_load_linux(X86MachineState *x86ms,
* PVH), so we try multiboot first since we check the multiboot magic
* header before to load it.
*/
if (load_multiboot(fw_cfg, f, kernel_filename, initrd_filename,
if (load_multiboot(x86ms, fw_cfg, f, kernel_filename, initrd_filename,
kernel_cmdline, kernel_size, header)) {
return;
}