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Re: [Qemu-devel] [PATCH v3] Sort the fw_cfg file list
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCH v3] Sort the fw_cfg file list |
Date: |
Thu, 17 Mar 2016 18:02:57 +0200 |
On Wed, Mar 16, 2016 at 01:47:08PM -0500, address@hidden wrote:
> From: Gerd Hoffmann <address@hidden>
>
> Entries are inserted in filename order instead of being
> appended to the end in case sorting is enabled.
>
> This will avoid any future issues of moving the file creation
> around, it doesn't matter what order they are created now,
> the will always be in filename order.
>
> Signed-off-by: Gerd Hoffmann <address@hidden>
>
> Added machine type handling for compatibility. This was
> a fairly complex change, this will preserve the order of fw_cfg
> for older versions no matter what order the firmware files
> actually come in. A list is kept of the correct legacy order
> and the entries will be inserted based upon their order in
> the list. Except that some entries are ordered (in a specific
> area of the list) based upon what order they appear on the
> command line. Special handling is added for those entries.
>
> Signed-off-by: Corey Minyard <address@hidden>
> ---
>
> A new version of the sorted fw_cfg, with new backwards
> compatibility code. This is bigger than I would like, but
> I can't think of a good way to split it up that would make
> much sense.
>
> This is more for review, anyway, I'm sure there are issues with
> this.
>
> I'm not too excited about fw_cfg_set_order_override(), but I can't
> think of a better way to handle this. You can't use filename or
> prefixes, the same filenames appear in different places for VGA
> ROMs depending on if they are PCI or ISA.
I don't see another good solution either.
However, I would like to make these NOPs with
new machine types.
This way down the road we can drop this mess.
> hw/i386/pc.c | 4 ++
> hw/i386/pc_piix.c | 1 +
> hw/i386/pc_q35.c | 1 +
> hw/nvram/fw_cfg.c | 127
> +++++++++++++++++++++++++++++++++++++++++++---
> include/hw/boards.h | 3 +-
> include/hw/nvram/fw_cfg.h | 7 +++
> vl.c | 4 ++
> 7 files changed, 138 insertions(+), 9 deletions(-)
>
> diff --git a/hw/i386/pc.c b/hw/i386/pc.c
> index 56ec6cd..707753b 100644
> --- a/hw/i386/pc.c
> +++ b/hw/i386/pc.c
> @@ -1406,6 +1406,7 @@ DeviceState *pc_vga_init(ISABus *isa_bus, PCIBus
> *pci_bus)
> {
> DeviceState *dev = NULL;
>
> + fw_cfg_set_order_override(FW_CFG_ORDER_OVERRIDE_VGA);
> if (pci_bus) {
> PCIDevice *pcidev = pci_vga_init(pci_bus);
> dev = pcidev ? &pcidev->qdev : NULL;
> @@ -1413,6 +1414,7 @@ DeviceState *pc_vga_init(ISABus *isa_bus, PCIBus
> *pci_bus)
> ISADevice *isadev = isa_vga_init(isa_bus);
> dev = isadev ? DEVICE(isadev) : NULL;
> }
> + fw_cfg_reset_order_override();
> return dev;
> }
>
> @@ -1541,6 +1543,7 @@ void pc_nic_init(ISABus *isa_bus, PCIBus *pci_bus)
> {
> int i;
>
> + fw_cfg_set_order_override(FW_CFG_ORDER_OVERRIDE_NIC);
> for (i = 0; i < nb_nics; i++) {
> NICInfo *nd = &nd_table[i];
>
> @@ -1550,6 +1553,7 @@ void pc_nic_init(ISABus *isa_bus, PCIBus *pci_bus)
> pci_nic_init_nofail(nd, pci_bus, "e1000", NULL);
> }
> }
> + fw_cfg_reset_order_override();
> }
>
> void pc_pci_device_init(PCIBus *pci_bus)
> diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
> index 6f8c2cd..447703b 100644
> --- a/hw/i386/pc_piix.c
> +++ b/hw/i386/pc_piix.c
> @@ -429,6 +429,7 @@ static void pc_i440fx_2_5_machine_options(MachineClass *m)
> m->alias = NULL;
> m->is_default = 0;
> pcmc->save_tsc_khz = false;
> + m->legacy_fw_cfg_order = 1;
> SET_MACHINE_COMPAT(m, PC_COMPAT_2_5);
> }
>
> diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
> index 46522c9..04f3609 100644
> --- a/hw/i386/pc_q35.c
> +++ b/hw/i386/pc_q35.c
> @@ -291,6 +291,7 @@ static void pc_q35_2_5_machine_options(MachineClass *m)
> pc_q35_2_6_machine_options(m);
> m->alias = NULL;
> pcmc->save_tsc_khz = false;
> + m->legacy_fw_cfg_order = 1;
> SET_MACHINE_COMPAT(m, PC_COMPAT_2_5);
> }
>
> diff --git a/hw/nvram/fw_cfg.c b/hw/nvram/fw_cfg.c
> index 7866248..1693f26 100644
> --- a/hw/nvram/fw_cfg.c
> +++ b/hw/nvram/fw_cfg.c
> @@ -28,6 +28,7 @@
> #include "hw/isa/isa.h"
> #include "hw/nvram/fw_cfg.h"
> #include "hw/sysbus.h"
> +#include "hw/boards.h"
> #include "trace.h"
> #include "qemu/error-report.h"
> #include "qemu/config-file.h"
> @@ -68,6 +69,7 @@ struct FWCfgState {
> /*< public >*/
>
> FWCfgEntry entries[2][FW_CFG_MAX_ENTRY];
> + int entry_order[FW_CFG_MAX_ENTRY];
> FWCfgFiles *files;
> uint16_t cur_entry;
> uint32_t cur_offset;
> @@ -664,12 +666,88 @@ void fw_cfg_add_i64(FWCfgState *s, uint16_t key,
> uint64_t value)
> fw_cfg_add_bytes(s, key, copy, sizeof(value));
> }
>
> +static int fw_cfg_order_override = -1;
> +
> +void fw_cfg_set_order_override(int order)
> +{
> + assert(fw_cfg_order_override == -1);
> + fw_cfg_order_override = order;
> +}
> +
> +void fw_cfg_reset_order_override(void)
> +{
> + assert(fw_cfg_order_override != -1);
> + fw_cfg_order_override = -1;
> +}
> +
> +/*
> + * This is the legacy order list. For legacy systems, files are in
> + * the fw_cfg in the order defined below, by the "order" value. Note
> + * that some entries (VGA ROMs, NIC option ROMS, etc.) go into a
> + * specific area, but there may be more than one and they occur in the
> + * order that the user specifies them on the command line. Those are
> + * handled in a special manner, using the order override above.
> + *
> + * For non-legacy, the files are sorted by filename to avoid this kind
> + * of complexity in the future.
> + *
> + * This is only for x86, other arches don't implement versioning so
> + * they won't set legacy mode.
> + */
> +static struct {
> + const char *name;
> + int order;
> +} fw_cfg_order[] = {
> + { "etc/boot-menu-wait", 10 },
> + { "bootsplash.jpg", 11 },
> + { "bootsplash.bmp", 12 },
> + { "etc/boot-fail-wait", 15 },
> + { "etc/smbios/smbios-tables", 20 },
> + { "etc/smbios/smbios-anchor", 30 },
> + { "etc/e820", 40 },
> + { "etc/reserved-memory-end", 50 },
> + { "genroms/linuxboot.bin", 60 },
> + { }, /* VGA ROMs from pc_vga_init come here, 70. */
> + { }, /* NIC option ROMs from pc_nic_init come here, 80. */
> + { "etc/system-states", 90 },
> + { }, /* User ROMs come here, 100. */
> + { }, /* Device FW comes here, 110. */
> + { "etc/extra-pci-roots", 120 },
> + { "etc/acpi/tables", 130 },
> + { "etc/table-loader", 140 },
> + { "etc/tpm/log", 150 },
> + { "etc/acpi/rsdp", 160 },
> + { "bootorder", 170 },
> +
> +#define FW_CFG_ORDER_OVERRIDE_LAST 200
> +};
> +
> +static int get_fw_cfg_order(const char *name)
> +{
> + int i;
> +
> + if (fw_cfg_order_override >= 0)
> + return fw_cfg_order_override;
> +
> + for (i = 0; i < ARRAY_SIZE(fw_cfg_order); i++) {
> + if (fw_cfg_order[i].name == NULL)
> + continue;
> + if (strcmp(name, fw_cfg_order[i].name) == 0)
> + return fw_cfg_order[i].order;
> + }
> + /* Stick unknown stuff at the end. */
> + error_report("warning: Unknown firmware file in legacy mode: %s\n",
> name);
> + return FW_CFG_ORDER_OVERRIDE_LAST;
> +}
> +
> void fw_cfg_add_file_callback(FWCfgState *s, const char *filename,
> FWCfgReadCallback callback, void
> *callback_opaque,
> void *data, size_t len)
> {
> - int i, index;
> + int i, index, count;
> size_t dsize;
> + MachineClass *mc = MACHINE_GET_CLASS(qdev_get_machine());
> + int order = 0;
>
> if (!s->files) {
> dsize = sizeof(uint32_t) + sizeof(FWCfgFile) * FW_CFG_FILE_SLOTS;
> @@ -677,13 +755,45 @@ void fw_cfg_add_file_callback(FWCfgState *s, const
> char *filename,
> fw_cfg_add_bytes(s, FW_CFG_FILE_DIR, s->files, dsize);
> }
>
> - index = be32_to_cpu(s->files->count);
> - assert(index < FW_CFG_FILE_SLOTS);
> + count = be32_to_cpu(s->files->count);
> + assert(count < FW_CFG_FILE_SLOTS);
>
> - pstrcpy(s->files->f[index].name, sizeof(s->files->f[index].name),
> - filename);
> - for (i = 0; i < index; i++) {
> - if (strcmp(s->files->f[index].name, s->files->f[i].name) == 0) {
> + /* Find the insertion point. */
> + if (mc->legacy_fw_cfg_order) {
> + /* Sort by order, and keep insertion order for the same order. */
> + order = get_fw_cfg_order(filename);
> + for (index = count;
> + index > 0 && order < s->entry_order[index - 1];
> + index--);
> + } else {
> + /* Sort by file name. */
> + for (index = count;
> + index > 0 && strcmp(filename, s->files->f[index - 1].name) < 0;
> + index--);
> + }
> +
> + /*
> + * Move all the entries from the index point and after down one
> + * to create a slot for the new entry. Because calculations are
> + * being done with the index, make it so that "i" is the current
> + * index and "i - 1" is the one being copied from, thus the
> + * unusual start and end in the for statement.
> + */
> + for (i = count + 1; i > index; i--) {
> + s->files->f[i] = s->files->f[i - 1];
> + s->files->f[i].select = cpu_to_be16(FW_CFG_FILE_FIRST + i);
> + s->entries[0][FW_CFG_FILE_FIRST + i] =
> + s->entries[0][FW_CFG_FILE_FIRST + i - 1];
> + s->entry_order[i] = s->entry_order[i - 1];
> + }
> +
> + memset(&s->files->f[index], 0, sizeof(FWCfgFile));
> + memset(&s->entries[0][FW_CFG_FILE_FIRST + index], 0, sizeof(FWCfgEntry));
> +
> + pstrcpy(s->files->f[index].name, sizeof(s->files->f[index].name),
> filename);
> + for (i = 0; i <= count; i++) {
> + if (i != index &&
> + strcmp(s->files->f[index].name, s->files->f[i].name) == 0) {
> error_report("duplicate fw_cfg file name: %s",
> s->files->f[index].name);
> exit(1);
> @@ -695,9 +805,10 @@ void fw_cfg_add_file_callback(FWCfgState *s, const char
> *filename,
>
> s->files->f[index].size = cpu_to_be32(len);
> s->files->f[index].select = cpu_to_be16(FW_CFG_FILE_FIRST + index);
> + s->entry_order[index] = order;
> trace_fw_cfg_add_file(s, index, s->files->f[index].name, len);
>
> - s->files->count = cpu_to_be32(index+1);
> + s->files->count = cpu_to_be32(count+1);
> }
>
> void fw_cfg_add_file(FWCfgState *s, const char *filename,
> diff --git a/include/hw/boards.h b/include/hw/boards.h
> index b5d7eae..b6567f7 100644
> --- a/include/hw/boards.h
> +++ b/include/hw/boards.h
> @@ -84,7 +84,8 @@ struct MachineClass {
> no_cdrom:1,
> no_sdcard:1,
> has_dynamic_sysbus:1,
> - pci_allow_0_address:1;
> + pci_allow_0_address:1,
> + legacy_fw_cfg_order:1;
> int is_default;
> const char *default_machine_opts;
> const char *default_boot_order;
> diff --git a/include/hw/nvram/fw_cfg.h b/include/hw/nvram/fw_cfg.h
> index 4315f4e..38bbfca 100644
> --- a/include/hw/nvram/fw_cfg.h
> +++ b/include/hw/nvram/fw_cfg.h
> @@ -57,6 +57,13 @@ typedef struct FWCfgFile {
> char name[FW_CFG_MAX_FILE_PATH];
> } FWCfgFile;
>
> +#define FW_CFG_ORDER_OVERRIDE_VGA 70
> +#define FW_CFG_ORDER_OVERRIDE_NIC 80
> +#define FW_CFG_ORDER_OVERRIDE_USER 100
> +#define FW_CFG_ORDER_OVERRIDE_DEVICE 110
> +void fw_cfg_set_order_override(int order);
> +void fw_cfg_reset_order_override(void);
> +
> typedef struct FWCfgFiles {
> uint32_t count;
> FWCfgFile f[];
> diff --git a/vl.c b/vl.c
> index 7a28982..6fad844 100644
> --- a/vl.c
> +++ b/vl.c
> @@ -4520,10 +4520,12 @@ int main(int argc, char **argv, char **envp)
>
> numa_post_machine_init();
>
> + fw_cfg_set_order_override(FW_CFG_ORDER_OVERRIDE_USER);
> if (qemu_opts_foreach(qemu_find_opts("fw_cfg"),
> parse_fw_cfg, fw_cfg_find(), NULL) != 0) {
> exit(1);
> }
> + fw_cfg_reset_order_override();
>
> /* init USB devices */
> if (usb_enabled()) {
> @@ -4535,10 +4537,12 @@ int main(int argc, char **argv, char **envp)
> igd_gfx_passthru();
>
> /* init generic devices */
> + fw_cfg_set_order_override(FW_CFG_ORDER_OVERRIDE_DEVICE);
> if (qemu_opts_foreach(qemu_find_opts("device"),
> device_init_func, NULL, NULL)) {
> exit(1);
> }
> + fw_cfg_reset_order_override();
>
> /* Did we create any drives that we failed to create a device for? */
> drive_check_orphaned();
> --
> 2.5.0
>