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[PATCH 2/4] hw/i386: define a struct for Linux boot protocol data
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From: |
Paolo Bonzini |
|
Subject: |
[PATCH 2/4] hw/i386: define a struct for Linux boot protocol data |
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Date: |
Thu, 21 Jul 2022 14:29:35 +0200 |
In preparation for moving parts of x86_load_linux to separate function,
define a struct with the data that needs to be passed back and forth.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
hw/i386/x86.c | 116 +++++++++++++++++++++++++++-----------------------
1 file changed, 62 insertions(+), 54 deletions(-)
diff --git a/hw/i386/x86.c b/hw/i386/x86.c
index 449edb076e..253a6ff536 100644
--- a/hw/i386/x86.c
+++ b/hw/i386/x86.c
@@ -819,22 +819,30 @@ static bool load_pvh(X86MachineState *x86ms, FWCfgState
*fw_cfg, const char *ker
return true;
}
+typedef struct LinuxBootData {
+ uint16_t protocol;
+ uint8_t header[8192];
+ hwaddr prot_addr;
+ size_t kernel_size;
+ uint8_t *kernel;
+ size_t setup_data_offset;
+} LinuxBootData;
+
void x86_load_linux(X86MachineState *x86ms,
FWCfgState *fw_cfg,
int acpi_data_size,
bool pvh_enabled)
{
bool linuxboot_dma_enabled =
X86_MACHINE_GET_CLASS(x86ms)->fwcfg_dma_enabled;
- uint16_t protocol;
- int setup_size, kernel_size, cmdline_size;
- int dtb_size, setup_data_offset;
+ int setup_size, cmdline_size;
+ int dtb_size;
uint32_t initrd_max;
- uint8_t header[8192], *setup, *kernel;
- hwaddr real_addr, prot_addr, cmdline_addr;
+ uint8_t *setup;
+ hwaddr real_addr, cmdline_addr;
FILE *f;
char *vmode;
MachineState *machine = MACHINE(x86ms);
- struct setup_data *setup_data;
+ LinuxBootData data = { 0 };
const char *kernel_filename = machine->kernel_filename;
const char *initrd_filename = machine->initrd_filename;
const char *dtb_filename = machine->dtb;
@@ -854,17 +862,17 @@ void x86_load_linux(X86MachineState *x86ms,
exit(1);
}
- kernel_size = get_file_size(f);
- if (!kernel_size ||
- fread(header, 1, MIN(ARRAY_SIZE(header), kernel_size), f) !=
- MIN(ARRAY_SIZE(header), kernel_size)) {
+ data.kernel_size = get_file_size(f);
+ if (!data.kernel_size ||
+ fread(data.header, 1, MIN(ARRAY_SIZE(data.header), data.kernel_size),
f) !=
+ MIN(ARRAY_SIZE(data.header), data.kernel_size)) {
fprintf(stderr, "qemu: could not load kernel '%s': %s\n",
kernel_filename, strerror(errno));
exit(1);
}
/* kernel protocol version */
- if (ldl_p(header + 0x202) != 0x53726448) {
+ if (ldl_p(data.header + 0x202) != 0x53726448) {
/*
* This could be a multiboot kernel. If it is, let's stop treating it
* like a Linux kernel.
@@ -873,7 +881,7 @@ void x86_load_linux(X86MachineState *x86ms,
* header before to load it.
*/
if (load_multiboot(x86ms, fw_cfg, f, kernel_filename, initrd_filename,
- kernel_cmdline, kernel_size, header)) {
+ kernel_cmdline, data.kernel_size, data.header)) {
return;
}
/*
@@ -883,35 +891,35 @@ void x86_load_linux(X86MachineState *x86ms,
*/
if (pvh_enabled &&
load_pvh(x86ms, fw_cfg, kernel_filename, initrd_filename,
- initrd_max, kernel_cmdline, kernel_size, header)) {
+ initrd_max, kernel_cmdline, data.kernel_size,
data.header)) {
fclose(f);
return;
}
- protocol = 0;
+ data.protocol = 0;
} else {
- protocol = lduw_p(header + 0x206);
+ data.protocol = lduw_p(data.header + 0x206);
}
- if (protocol < 0x200 || !(header[0x211] & 0x01)) {
+ if (data.protocol < 0x200 || !(data.header[0x211] & 0x01)) {
/* Low kernel */
real_addr = 0x90000;
cmdline_addr = 0x9a000 - cmdline_size;
- prot_addr = 0x10000;
- } else if (protocol < 0x202) {
+ data.prot_addr = 0x10000;
+ } else if (data.protocol < 0x202) {
/* High but ancient kernel */
real_addr = 0x90000;
cmdline_addr = 0x9a000 - cmdline_size;
- prot_addr = 0x100000;
+ data.prot_addr = 0x100000;
} else {
/* High and recent kernel */
real_addr = 0x10000;
cmdline_addr = 0x20000;
- prot_addr = 0x100000;
+ data.prot_addr = 0x100000;
}
/* highest address for loading the initrd */
- if (protocol >= 0x20c &&
- lduw_p(header + 0x236) & XLF_CAN_BE_LOADED_ABOVE_4G) {
+ if (data.protocol >= 0x20c &&
+ lduw_p(data.header + 0x236) & XLF_CAN_BE_LOADED_ABOVE_4G) {
/*
* Linux has supported initrd up to 4 GB for a very long time (2007,
* long before XLF_CAN_BE_LOADED_ABOVE_4G which was added in 2013),
@@ -928,8 +936,8 @@ void x86_load_linux(X86MachineState *x86ms,
*
* Therefore here just limit initrd_max to the available memory below
4G.
*/
- } else if (protocol >= 0x203) {
- initrd_max = MIN(initrd_max, ldl_p(header + 0x22c));
+ } else if (data.protocol >= 0x203) {
+ initrd_max = MIN(initrd_max, ldl_p(data.header + 0x22c));
} else {
initrd_max = MIN(initrd_max, 0x37ffffff);
}
@@ -940,11 +948,11 @@ void x86_load_linux(X86MachineState *x86ms,
sev_load_ctx.cmdline_data = (char *)kernel_cmdline;
sev_load_ctx.cmdline_size = strlen(kernel_cmdline) + 1;
- if (protocol >= 0x202) {
- stl_p(header + 0x228, cmdline_addr);
+ if (data.protocol >= 0x202) {
+ stl_p(data.header + 0x228, cmdline_addr);
} else {
- stw_p(header + 0x20, 0xA33F);
- stw_p(header + 0x22, cmdline_addr - real_addr);
+ stw_p(data.header + 0x20, 0xA33F);
+ stw_p(data.header + 0x22, cmdline_addr - real_addr);
}
/* handle vga= parameter */
@@ -968,7 +976,7 @@ void x86_load_linux(X86MachineState *x86ms,
exit(1);
}
}
- stw_p(header + 0x1fa, video_mode);
+ stw_p(data.header + 0x1fa, video_mode);
}
/* loader type */
@@ -977,13 +985,13 @@ void x86_load_linux(X86MachineState *x86ms,
* If this code is substantially changed, you may want to consider
* incrementing the revision.
*/
- if (protocol >= 0x200) {
- header[0x210] = 0xB0;
+ if (data.protocol >= 0x200) {
+ data.header[0x210] = 0xB0;
}
/* heap */
- if (protocol >= 0x201) {
- header[0x211] |= 0x80; /* CAN_USE_HEAP */
- stw_p(header + 0x224, cmdline_addr - real_addr - 0x200);
+ if (data.protocol >= 0x201) {
+ data.header[0x211] |= 0x80; /* CAN_USE_HEAP */
+ stw_p(data.header + 0x224, cmdline_addr - real_addr - 0x200);
}
/* load initrd */
@@ -993,7 +1001,7 @@ void x86_load_linux(X86MachineState *x86ms,
gchar *initrd_data;
GError *gerr = NULL;
- if (protocol < 0x200) {
+ if (data.protocol < 0x200) {
fprintf(stderr, "qemu: linux kernel too old to load a ram disk\n");
exit(1);
}
@@ -1023,30 +1031,30 @@ void x86_load_linux(X86MachineState *x86ms,
sev_load_ctx.initrd_data = initrd_data;
sev_load_ctx.initrd_size = initrd_size;
- stl_p(header + 0x218, initrd_addr);
- stl_p(header + 0x21c, initrd_size);
+ stl_p(data.header + 0x218, initrd_addr);
+ stl_p(data.header + 0x21c, initrd_size);
}
/* load kernel and setup */
- setup_size = header[0x1f1];
+ setup_size = data.header[0x1f1];
if (setup_size == 0) {
setup_size = 4;
}
setup_size = (setup_size + 1) * 512;
- if (setup_size > kernel_size) {
+ if (setup_size > data.kernel_size) {
fprintf(stderr, "qemu: invalid kernel header\n");
exit(1);
}
- kernel_size -= setup_size;
+ data.kernel_size -= setup_size;
setup = g_malloc(setup_size);
- kernel = g_malloc(kernel_size);
+ data.kernel = g_malloc(data.kernel_size);
fseek(f, 0, SEEK_SET);
if (fread(setup, 1, setup_size, f) != setup_size) {
fprintf(stderr, "fread() failed\n");
exit(1);
}
- if (fread(kernel, 1, kernel_size, f) != kernel_size) {
+ if (fread(data.kernel, 1, data.kernel_size, f) != data.kernel_size) {
fprintf(stderr, "fread() failed\n");
exit(1);
}
@@ -1054,7 +1062,7 @@ void x86_load_linux(X86MachineState *x86ms,
/* append dtb to kernel */
if (dtb_filename) {
- if (protocol < 0x209) {
+ if (data.protocol < 0x209) {
fprintf(stderr, "qemu: Linux kernel too old to load a dtb\n");
exit(1);
}
@@ -1066,13 +1074,13 @@ void x86_load_linux(X86MachineState *x86ms,
exit(1);
}
- setup_data_offset = QEMU_ALIGN_UP(kernel_size, 16);
- kernel_size = setup_data_offset + sizeof(struct setup_data) + dtb_size;
- kernel = g_realloc(kernel, kernel_size);
+ data.setup_data_offset = QEMU_ALIGN_UP(data.kernel_size, 16);
+ data.kernel_size = data.setup_data_offset + sizeof(struct setup_data)
+ dtb_size;
+ data.kernel = g_realloc(data.kernel, data.kernel_size);
- stq_p(header + 0x250, prot_addr + setup_data_offset);
+ stq_p(data.header + 0x250, data.prot_addr + data.setup_data_offset);
- setup_data = (struct setup_data *)(kernel + setup_data_offset);
+ struct setup_data *setup_data = (struct setup_data *)(data.kernel +
data.setup_data_offset);
setup_data->next = 0;
setup_data->type = cpu_to_le32(SETUP_DTB);
setup_data->len = cpu_to_le32(dtb_size);
@@ -1088,14 +1096,14 @@ void x86_load_linux(X86MachineState *x86ms,
* file the user passed in.
*/
if (!sev_enabled()) {
- memcpy(setup, header, MIN(sizeof(header), setup_size));
+ memcpy(setup, data.header, MIN(sizeof(data.header), setup_size));
}
- fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_ADDR, prot_addr);
- fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_SIZE, kernel_size);
- fw_cfg_add_bytes(fw_cfg, FW_CFG_KERNEL_DATA, kernel, kernel_size);
- sev_load_ctx.kernel_data = (char *)kernel;
- sev_load_ctx.kernel_size = kernel_size;
+ fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_ADDR, data.prot_addr);
+ fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_SIZE, data.kernel_size);
+ fw_cfg_add_bytes(fw_cfg, FW_CFG_KERNEL_DATA, data.kernel,
data.kernel_size);
+ sev_load_ctx.kernel_data = (char *)data.kernel;
+ sev_load_ctx.kernel_size = data.kernel_size;
fw_cfg_add_i32(fw_cfg, FW_CFG_SETUP_ADDR, real_addr);
fw_cfg_add_i32(fw_cfg, FW_CFG_SETUP_SIZE, setup_size);
--
2.36.1