[Qemu-devel] [PATCH v7 0/2] PC system flash support

[Qemu-devel] [PATCH v7 0/2] PC system flash support

[Jordan Justen]

Enable flash emulation in a PC system using pflash_cfi01.

v7:
* Do not add system firmware to qemu roms
* If kvm is enabled, copy pflash drive contents into a
  read-only ram region, since kvm cannot currently execute
  code from a pflash device.
* Rename pcflash.c to pc_sysfw.c

v6:
* Rebase for memory API
* pflash_cfi01: Set error in status register when a write or
  erase is attempted in read-only mode.
* Add system firmware to qemu roms

v5:
* Enable pflash read-only mode
* Enable -drive with if=pflash to define system firmware image

v4:
* Rebase

v3:
* Fix code style issues
* Add additional comments

v2:
* Convert debug printf to DPRINTF

Jordan Justen (2):
  pflash: Support read-only mode
  pc: Support system flash memory with pflash

 Makefile.target                    |    1 +
 blockdev.c                         |    3 +-
 default-configs/i386-softmmu.mak   |    1 +
 default-configs/x86_64-softmmu.mak |    1 +
 hw/boards.h                        |    1 +
 hw/pc.c                            |   55 +---------
 hw/pc.h                            |    3 +
 hw/pc_sysfw.c                      |  196 ++++++++++++++++++++++++++++++++++++
 hw/pflash_cfi01.c                  |   44 ++++++---
 hw/pflash_cfi02.c                  |   83 ++++++++-------
 vl.c                               |    2 +-
 11 files changed, 286 insertions(+), 104 deletions(-)
 create mode 100644 hw/pc_sysfw.c

[Qemu-devel] [PATCH v7 1/2] pflash: Support read-only mode

[Jordan Justen]

When read-only mode is enabled, no changes will be made
to the flash image in memory, and no bdrv_write calls will be
made.

For pflash_cfi01 (Intel), if the flash is in read-only mode
then the status register will signal block erase error or
program error when these operations are attempted.

For pflash_cfi02 (AMD), if the flash is in read-only mode
then the pflash will silently ignore all write/erase commands.

Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
---
 blockdev.c        |    3 +-
 hw/pflash_cfi01.c |   44 +++++++++++++++++++---------
 hw/pflash_cfi02.c |   83 ++++++++++++++++++++++++++++------------------------
 3 files changed, 77 insertions(+), 53 deletions(-)

diff --git a/blockdev.c b/blockdev.c
index 0827bf7..c94aee5 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -506,7 +506,8 @@ DriveInfo *drive_init(QemuOpts *opts, int default_to_scsi)
         /* CDROM is fine for any interface, don't check.  */
         ro = 1;
     } else if (ro == 1) {
-        if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY && type != IF_NONE) {
+        if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY &&
+            type != IF_NONE && type != IF_PFLASH) {
             error_report("readonly not supported by this bus type");
             goto err;
         }
diff --git a/hw/pflash_cfi01.c b/hw/pflash_cfi01.c
index 69b8e3d..1e0a053 100644
--- a/hw/pflash_cfi01.c
+++ b/hw/pflash_cfi01.c
@@ -283,8 +283,12 @@ static void pflash_write(pflash_t *pfl, target_phys_addr_t offset,
                     TARGET_FMT_plx "\n",
                     __func__, offset, pfl->sector_len);
 
-            memset(p + offset, 0xff, pfl->sector_len);
-            pflash_update(pfl, offset, pfl->sector_len);
+            if (!pfl->ro) {
+                memset(p + offset, 0xff, pfl->sector_len);
+                pflash_update(pfl, offset, pfl->sector_len);
+            } else {
+                pfl->status |= 0x20; /* Block erase error */
+            }
             pfl->status |= 0x80; /* Ready! */
             break;
         case 0x50: /* Clear status bits */
@@ -323,8 +327,12 @@ static void pflash_write(pflash_t *pfl, target_phys_addr_t offset,
         case 0x10: /* Single Byte Program */
         case 0x40: /* Single Byte Program */
             DPRINTF("%s: Single Byte Program\n", __func__);
-            pflash_data_write(pfl, offset, value, width, be);
-            pflash_update(pfl, offset, width);
+            if (!pfl->ro) {
+                pflash_data_write(pfl, offset, value, width, be);
+                pflash_update(pfl, offset, width);
+            } else {
+                pfl->status |= 0x10; /* Programming error */
+            }
             pfl->status |= 0x80; /* Ready! */
             pfl->wcycle = 0;
         break;
@@ -372,7 +380,11 @@ static void pflash_write(pflash_t *pfl, target_phys_addr_t offset,
     case 2:
         switch (pfl->cmd) {
         case 0xe8: /* Block write */
-            pflash_data_write(pfl, offset, value, width, be);
+            if (!pfl->ro) {
+                pflash_data_write(pfl, offset, value, width, be);
+            } else {
+                pfl->status |= 0x10; /* Programming error */
+            }
 
             pfl->status |= 0x80;
 
@@ -382,8 +394,12 @@ static void pflash_write(pflash_t *pfl, target_phys_addr_t offset,
 
                 DPRINTF("%s: block write finished\n", __func__);
                 pfl->wcycle++;
-                /* Flush the entire write buffer onto backing storage.  */
-                pflash_update(pfl, offset & mask, pfl->writeblock_size);
+                if (!pfl->ro) {
+                    /* Flush the entire write buffer onto backing storage.  */
+                    pflash_update(pfl, offset & mask, pfl->writeblock_size);
+                } else {
+                    pfl->status |= 0x10; /* Programming error */
+                }
             }
 
             pfl->counter--;
@@ -605,13 +621,13 @@ pflash_t *pflash_cfi01_register(target_phys_addr_t base,
         }
         bdrv_attach_dev_nofail(pfl->bs, pfl);
     }
-#if 0 /* XXX: there should be a bit to set up read-only,
-       *      the same way the hardware does (with WP pin).
-       */
-    pfl->ro = 1;
-#else
-    pfl->ro = 0;
-#endif
+
+    if (pfl->bs) {
+        pfl->ro = bdrv_is_read_only(pfl->bs);
+    } else {
+        pfl->ro = 0;
+    }
+
     pfl->timer = qemu_new_timer_ns(vm_clock, pflash_timer, pfl);
     pfl->base = base;
     pfl->sector_len = sector_len;
diff --git a/hw/pflash_cfi02.c b/hw/pflash_cfi02.c
index e5a63da..9e91bdd 100644
--- a/hw/pflash_cfi02.c
+++ b/hw/pflash_cfi02.c
@@ -329,35 +329,37 @@ static void pflash_write (pflash_t *pfl, target_phys_addr_t offset,
             DPRINTF("%s: write data offset " TARGET_FMT_plx " %08x %d\n",
                     __func__, offset, value, width);
             p = pfl->storage;
-            switch (width) {
-            case 1:
-                p[offset] &= value;
-                pflash_update(pfl, offset, 1);
-                break;
-            case 2:
-                if (be) {
-                    p[offset] &= value >> 8;
-                    p[offset + 1] &= value;
-                } else {
+            if (!pfl->ro) {
+                switch (width) {
+                case 1:
                     p[offset] &= value;
-                    p[offset + 1] &= value >> 8;
+                    pflash_update(pfl, offset, 1);
+                    break;
+                case 2:
+                    if (be) {
+                        p[offset] &= value >> 8;
+                        p[offset + 1] &= value;
+                    } else {
+                        p[offset] &= value;
+                        p[offset + 1] &= value >> 8;
+                    }
+                    pflash_update(pfl, offset, 2);
+                    break;
+                case 4:
+                    if (be) {
+                        p[offset] &= value >> 24;
+                        p[offset + 1] &= value >> 16;
+                        p[offset + 2] &= value >> 8;
+                        p[offset + 3] &= value;
+                    } else {
+                        p[offset] &= value;
+                        p[offset + 1] &= value >> 8;
+                        p[offset + 2] &= value >> 16;
+                        p[offset + 3] &= value >> 24;
+                    }
+                    pflash_update(pfl, offset, 4);
+                    break;
                 }
-                pflash_update(pfl, offset, 2);
-                break;
-            case 4:
-                if (be) {
-                    p[offset] &= value >> 24;
-                    p[offset + 1] &= value >> 16;
-                    p[offset + 2] &= value >> 8;
-                    p[offset + 3] &= value;
-                } else {
-                    p[offset] &= value;
-                    p[offset + 1] &= value >> 8;
-                    p[offset + 2] &= value >> 16;
-                    p[offset + 3] &= value >> 24;
-                }
-                pflash_update(pfl, offset, 4);
-                break;
             }
             pfl->status = 0x00 | ~(value & 0x80);
             /* Let's pretend write is immediate */
@@ -403,9 +405,11 @@ static void pflash_write (pflash_t *pfl, target_phys_addr_t offset,
             }
             /* Chip erase */
             DPRINTF("%s: start chip erase\n", __func__);
-            memset(pfl->storage, 0xFF, pfl->chip_len);
+            if (!pfl->ro) {
+                memset(pfl->storage, 0xFF, pfl->chip_len);
+                pflash_update(pfl, 0, pfl->chip_len);
+            }
             pfl->status = 0x00;
-            pflash_update(pfl, 0, pfl->chip_len);
             /* Let's wait 5 seconds before chip erase is done */
             qemu_mod_timer(pfl->timer,
                            qemu_get_clock_ns(vm_clock) + (get_ticks_per_sec() * 5));
@@ -416,8 +420,10 @@ static void pflash_write (pflash_t *pfl, target_phys_addr_t offset,
             offset &= ~(pfl->sector_len - 1);
             DPRINTF("%s: start sector erase at " TARGET_FMT_plx "\n", __func__,
                     offset);
-            memset(p + offset, 0xFF, pfl->sector_len);
-            pflash_update(pfl, offset, pfl->sector_len);
+            if (!pfl->ro) {
+                memset(p + offset, 0xFF, pfl->sector_len);
+                pflash_update(pfl, offset, pfl->sector_len);
+            }
             pfl->status = 0x00;
             /* Let's wait 1/2 second before sector erase is done */
             qemu_mod_timer(pfl->timer,
@@ -643,16 +649,17 @@ pflash_t *pflash_cfi02_register(target_phys_addr_t base,
         }
         bdrv_attach_dev_nofail(pfl->bs, pfl);
     }
+
     pflash_setup_mappings(pfl);
     pfl->rom_mode = 1;
     memory_region_add_subregion(get_system_memory(), pfl->base, &pfl->mem);
-#if 0 /* XXX: there should be a bit to set up read-only,
-       *      the same way the hardware does (with WP pin).
-       */
-    pfl->ro = 1;
-#else
-    pfl->ro = 0;
-#endif
+
+    if (pfl->bs) {
+        pfl->ro = bdrv_is_read_only(pfl->bs);
+    } else {
+        pfl->ro = 0;
+    }
+
     pfl->timer = qemu_new_timer_ns(vm_clock, pflash_timer, pfl);
     pfl->sector_len = sector_len;
     pfl->width = width;
-- 
1.7.1

[Qemu-devel] [PATCH v7 2/2] pc: Support system flash memory with pflash

[Jordan Justen]

If a pflash image is found, then it is used for the system
firmware image.

If a pflash image is not initially found, then a read-only
pflash device is created using the -bios filename.

KVM cannot execute from a pflash region currently.
Therefore, when KVM is enabled, a (read-only) ram memory
region is created and filled with the contents of the
pflash drive.

Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Cc: Anthony Liguori <aliguori@us.ibm.com>
---
 Makefile.target                    |    1 +
 default-configs/i386-softmmu.mak   |    1 +
 default-configs/x86_64-softmmu.mak |    1 +
 hw/boards.h                        |    1 +
 hw/pc.c                            |   55 +---------
 hw/pc.h                            |    3 +
 hw/pc_sysfw.c                      |  196 ++++++++++++++++++++++++++++++++++++
 vl.c                               |    2 +-
 8 files changed, 209 insertions(+), 51 deletions(-)
 create mode 100644 hw/pc_sysfw.c

diff --git a/Makefile.target b/Makefile.target
index 0c86bc5..8adda6c 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -232,6 +232,7 @@ obj-i386-y += vmport.o
 obj-i386-y += device-hotplug.o pci-hotplug.o smbios.o wdt_ib700.o
 obj-i386-y += debugcon.o multiboot.o
 obj-i386-y += pc_piix.o
+obj-i386-y += pc_sysfw.o
 obj-i386-$(CONFIG_KVM) += kvmclock.o
 obj-i386-$(CONFIG_SPICE) += qxl.o qxl-logger.o qxl-render.o
 
diff --git a/default-configs/i386-softmmu.mak b/default-configs/i386-softmmu.mak
index e67ebb3..cd407a9 100644
--- a/default-configs/i386-softmmu.mak
+++ b/default-configs/i386-softmmu.mak
@@ -22,3 +22,4 @@ CONFIG_SOUND=y
 CONFIG_HPET=y
 CONFIG_APPLESMC=y
 CONFIG_I8259=y
+CONFIG_PFLASH_CFI01=y
diff --git a/default-configs/x86_64-softmmu.mak b/default-configs/x86_64-softmmu.mak
index b75757e..47734ea 100644
--- a/default-configs/x86_64-softmmu.mak
+++ b/default-configs/x86_64-softmmu.mak
@@ -22,3 +22,4 @@ CONFIG_SOUND=y
 CONFIG_HPET=y
 CONFIG_APPLESMC=y
 CONFIG_I8259=y
+CONFIG_PFLASH_CFI01=y
diff --git a/hw/boards.h b/hw/boards.h
index 716fd7b..45a31a1 100644
--- a/hw/boards.h
+++ b/hw/boards.h
@@ -33,6 +33,7 @@ typedef struct QEMUMachine {
 } QEMUMachine;
 
 int qemu_register_machine(QEMUMachine *m);
+QEMUMachine *find_default_machine(void);
 
 extern QEMUMachine *current_machine;
 
diff --git a/hw/pc.c b/hw/pc.c
index eb4c2d8..ce97eb7 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -57,10 +57,6 @@
 #define DPRINTF(fmt, ...)
 #endif
 
-#define BIOS_FILENAME "bios.bin"
-
-#define PC_MAX_BIOS_SIZE (4 * 1024 * 1024)
-
 /* Leave a chunk of memory at the top of RAM for the BIOS ACPI tables.  */
 #define ACPI_DATA_SIZE       0x10000
 #define BIOS_CFG_IOPORT 0x510
@@ -976,11 +972,9 @@ void pc_memory_init(MemoryRegion *system_memory,
                     MemoryRegion *rom_memory,
                     MemoryRegion **ram_memory)
 {
-    char *filename;
-    int ret, linux_boot, i;
-    MemoryRegion *ram, *bios, *isa_bios, *option_rom_mr;
+    int linux_boot, i;
+    MemoryRegion *ram, *option_rom_mr;
     MemoryRegion *ram_below_4g, *ram_above_4g;
-    int bios_size, isa_bios_size;
     void *fw_cfg;
 
     linux_boot = (kernel_filename != NULL);
@@ -1005,43 +999,9 @@ void pc_memory_init(MemoryRegion *system_memory,
                                     ram_above_4g);
     }
 
-    /* BIOS load */
-    if (bios_name == NULL)
-        bios_name = BIOS_FILENAME;
-    filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
-    if (filename) {
-        bios_size = get_image_size(filename);
-    } else {
-        bios_size = -1;
-    }
-    if (bios_size <= 0 ||
-        (bios_size % 65536) != 0) {
-        goto bios_error;
-    }
-    bios = g_malloc(sizeof(*bios));
-    memory_region_init_ram(bios, NULL, "pc.bios", bios_size);
-    memory_region_set_readonly(bios, true);
-    ret = rom_add_file_fixed(bios_name, (uint32_t)(-bios_size), -1);
-    if (ret != 0) {
-    bios_error:
-        fprintf(stderr, "qemu: could not load PC BIOS '%s'\n", bios_name);
-        exit(1);
-    }
-    if (filename) {
-        g_free(filename);
-    }
-    /* map the last 128KB of the BIOS in ISA space */
-    isa_bios_size = bios_size;
-    if (isa_bios_size > (128 * 1024))
-        isa_bios_size = 128 * 1024;
-    isa_bios = g_malloc(sizeof(*isa_bios));
-    memory_region_init_alias(isa_bios, "isa-bios", bios,
-                             bios_size - isa_bios_size, isa_bios_size);
-    memory_region_add_subregion_overlap(rom_memory,
-                                        0x100000 - isa_bios_size,
-                                        isa_bios,
-                                        1);
-    memory_region_set_readonly(isa_bios, true);
+
+    /* Initialize ROM or flash ranges for PC firmware */
+    pc_system_firmware_init(rom_memory);
 
     option_rom_mr = g_malloc(sizeof(*option_rom_mr));
     memory_region_init_ram(option_rom_mr, NULL, "pc.rom", PC_ROM_SIZE);
@@ -1050,11 +1010,6 @@ void pc_memory_init(MemoryRegion *system_memory,
                                         option_rom_mr,
                                         1);
 
-    /* map all the bios at the top of memory */
-    memory_region_add_subregion(rom_memory,
-                                (uint32_t)(-bios_size),
-                                bios);
-
     fw_cfg = bochs_bios_init();
     rom_set_fw(fw_cfg);
 
diff --git a/hw/pc.h b/hw/pc.h
index 4515006..b98d734 100644
--- a/hw/pc.h
+++ b/hw/pc.h
@@ -244,6 +244,9 @@ static inline bool isa_ne2000_init(int base, int irq, NICInfo *nd)
     return true;
 }
 
+/* pcflash.c */
+void pc_system_firmware_init(MemoryRegion *rom_memory);
+
 /* e820 types */
 #define E820_RAM        1
 #define E820_RESERVED   2
diff --git a/hw/pc_sysfw.c b/hw/pc_sysfw.c
new file mode 100644
index 0000000..21b35c6
--- /dev/null
+++ b/hw/pc_sysfw.c
@@ -0,0 +1,196 @@
+/*
+ * QEMU PC System Firmware
+ *
+ * Copyright (c) 2003-2004 Fabrice Bellard
+ * Copyright (c) 2011 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "hw.h"
+#include "pc.h"
+#include "hw/boards.h"
+#include "loader.h"
+#include "sysemu.h"
+#include "flash.h"
+#include "kvm.h"
+
+#define BIOS_FILENAME "bios.bin"
+
+static void pc_isa_bios_init(MemoryRegion *rom_memory,
+                             MemoryRegion *flash_mem,
+                             int ram_size)
+{
+    int isa_bios_size;
+    MemoryRegion *isa_bios;
+    uint64_t flash_size;
+    void *flash_ptr, *isa_bios_ptr;
+
+    flash_size = memory_region_size(flash_mem);
+
+    /* map the last 128KB of the BIOS in ISA space */
+    isa_bios_size = flash_size;
+    if (isa_bios_size > (128 * 1024)) {
+        isa_bios_size = 128 * 1024;
+    }
+    isa_bios = g_malloc(sizeof(*isa_bios));
+    memory_region_init_ram(isa_bios, NULL, "isa-bios", isa_bios_size);
+    memory_region_add_subregion_overlap(rom_memory,
+                                        0x100000 - isa_bios_size,
+                                        isa_bios,
+                                        1);
+
+    /* copy ISA rom image from top of flash memory */
+    flash_ptr = memory_region_get_ram_ptr(flash_mem);
+    isa_bios_ptr = memory_region_get_ram_ptr(isa_bios);
+    memcpy(isa_bios_ptr,
+           ((uint8_t*)flash_ptr) + (flash_size - isa_bios_size),
+           isa_bios_size);
+
+    memory_region_set_readonly(isa_bios, true);
+}
+
+static void pc_fw_add_pflash_drv(void)
+{
+    QemuOpts *opts;
+    QEMUMachine *machine;
+    char *filename;
+
+    if (bios_name == NULL) {
+        bios_name = BIOS_FILENAME;
+    }
+    filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
+
+    opts = drive_add(IF_PFLASH, -1, filename, "readonly=on");
+    if (opts == NULL) {
+      return;
+    }
+
+    machine = find_default_machine();
+    if (machine == NULL) {
+      return;
+    }
+
+    drive_init(opts, machine->use_scsi);
+}
+
+static void pc_system_flash_init(MemoryRegion *rom_memory,
+                                 DriveInfo *pflash_drv)
+{
+    BlockDriverState *bdrv;
+    int64_t size;
+    target_phys_addr_t phys_addr;
+    int sector_bits, sector_size;
+    pflash_t *system_flash;
+    MemoryRegion *flash_mem;
+
+    bdrv = pflash_drv->bdrv;
+    size = bdrv_getlength(pflash_drv->bdrv);
+    sector_bits = 12;
+    sector_size = 1 << sector_bits;
+
+    if ((size % sector_size) != 0) {
+        fprintf(stderr,
+                "qemu: PC system firmware (pflash) must be a multiple of 0x%x\n",
+                sector_size);
+        exit(1);
+    }
+
+    phys_addr = 0x100000000ULL - size;
+    system_flash = pflash_cfi01_register(phys_addr, NULL, "system.flash", size,
+                                         bdrv, sector_size, size >> sector_bits,
+                                         1, 0x0000, 0x0000, 0x0000, 0x0000, 0);
+    flash_mem = pflash_cfi01_get_memory(system_flash);
+
+    pc_isa_bios_init(rom_memory, flash_mem, size);
+}
+
+static void pc_system_rom_init(MemoryRegion *rom_memory,
+                               DriveInfo *pflash_drv)
+{
+    BlockDriverState *bdrv;
+    int64_t size;
+    target_phys_addr_t phys_addr;
+    int sector_bits, sector_size;
+    MemoryRegion *sys_rom;
+    void *buffer;
+    int ret;
+
+    bdrv = pflash_drv->bdrv;
+    size = bdrv_getlength(pflash_drv->bdrv);
+    sector_bits = 9;
+    sector_size = 1 << sector_bits;
+
+    if ((size % sector_size) != 0) {
+        fprintf(stderr,
+                "qemu: PC system rom (pflash) must be a multiple of 0x%x\n",
+                sector_size);
+        exit(1);
+    }
+
+    phys_addr = 0x100000000ULL - size;
+    sys_rom = g_malloc(sizeof(*sys_rom));
+    memory_region_init_ram(sys_rom, NULL, "system.rom", size);
+    buffer = memory_region_get_ram_ptr(sys_rom);
+    memory_region_add_subregion(rom_memory, phys_addr, sys_rom);
+    printf("rom: added from pflash drive @ 0x%lx\n", phys_addr);
+
+    /* read the rom content */
+    ret = bdrv_read(bdrv, 0, buffer, size >> sector_bits);
+    if (ret < 0) {
+        memory_region_destroy(sys_rom);
+        g_free(sys_rom);
+        fprintf(stderr,
+                "qemu: Failed to read rom image from pflash drive\n");
+        exit(1);
+    }
+    printf("rom: read from pflash drive\n");
+
+    memory_region_set_readonly(sys_rom, true);
+
+    pc_isa_bios_init(rom_memory, sys_rom, size);
+}
+
+void pc_system_firmware_init(MemoryRegion *rom_memory)
+{
+    int flash_present;
+    DriveInfo *pflash_drv;
+
+    pflash_drv = drive_get(IF_PFLASH, 0, 0);
+    flash_present = (pflash_drv != NULL);
+
+    if (!flash_present) {
+        pc_fw_add_pflash_drv();
+        pflash_drv = drive_get(IF_PFLASH, 0, 0);
+        flash_present = (pflash_drv != NULL);
+    }
+
+    if (!flash_present) {
+        fprintf(stderr, "qemu: PC system firmware (pflash) not available\n");
+        exit(1);
+    }
+
+    if (!kvm_enabled()) {
+        pc_system_flash_init(rom_memory, pflash_drv);
+    } else {
+        pc_system_rom_init(rom_memory, pflash_drv);
+    }
+}
+
+
diff --git a/vl.c b/vl.c
index 624da0f..8a6032e 100644
--- a/vl.c
+++ b/vl.c
@@ -1183,7 +1183,7 @@ static QEMUMachine *find_machine(const char *name)
     return NULL;
 }
 
-static QEMUMachine *find_default_machine(void)
+QEMUMachine *find_default_machine(void)
 {
     QEMUMachine *m;
 
-- 
1.7.1

Re: [Qemu-devel] [PATCH v7 2/2] pc: Support system flash memory with pflash

[Jordan Justen]

On Wed, Nov 2, 2011 at 21:19, Jordan Justen <jordan.l.justen@intel.com> wrote:
> If a pflash image is found, then it is used for the system
> firmware image.
>
> If a pflash image is not initially found, then a read-only
> pflash device is created using the -bios filename.
>
> KVM cannot execute from a pflash region currently.
> Therefore, when KVM is enabled, a (read-only) ram memory
> region is created and filled with the contents of the
> pflash drive.
>
> Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
> Cc: Anthony Liguori <aliguori@us.ibm.com>
> ---
>  Makefile.target                    |    1 +
>  default-configs/i386-softmmu.mak   |    1 +
>  default-configs/x86_64-softmmu.mak |    1 +
>  hw/boards.h                        |    1 +
>  hw/pc.c                            |   55 +---------
>  hw/pc.h                            |    3 +
>  hw/pc_sysfw.c                      |  196 ++++++++++++++++++++++++++++++++++++
>  vl.c                               |    2 +-
>  8 files changed, 209 insertions(+), 51 deletions(-)
>  create mode 100644 hw/pc_sysfw.c
>
> diff --git a/Makefile.target b/Makefile.target
> index 0c86bc5..8adda6c 100644
> --- a/Makefile.target
> +++ b/Makefile.target
> @@ -232,6 +232,7 @@ obj-i386-y += vmport.o
>  obj-i386-y += device-hotplug.o pci-hotplug.o smbios.o wdt_ib700.o
>  obj-i386-y += debugcon.o multiboot.o
>  obj-i386-y += pc_piix.o
> +obj-i386-y += pc_sysfw.o
>  obj-i386-$(CONFIG_KVM) += kvmclock.o
>  obj-i386-$(CONFIG_SPICE) += qxl.o qxl-logger.o qxl-render.o
>
> diff --git a/default-configs/i386-softmmu.mak b/default-configs/i386-softmmu.mak
> index e67ebb3..cd407a9 100644
> --- a/default-configs/i386-softmmu.mak
> +++ b/default-configs/i386-softmmu.mak
> @@ -22,3 +22,4 @@ CONFIG_SOUND=y
>  CONFIG_HPET=y
>  CONFIG_APPLESMC=y
>  CONFIG_I8259=y
> +CONFIG_PFLASH_CFI01=y
> diff --git a/default-configs/x86_64-softmmu.mak b/default-configs/x86_64-softmmu.mak
> index b75757e..47734ea 100644
> --- a/default-configs/x86_64-softmmu.mak
> +++ b/default-configs/x86_64-softmmu.mak
> @@ -22,3 +22,4 @@ CONFIG_SOUND=y
>  CONFIG_HPET=y
>  CONFIG_APPLESMC=y
>  CONFIG_I8259=y
> +CONFIG_PFLASH_CFI01=y
> diff --git a/hw/boards.h b/hw/boards.h
> index 716fd7b..45a31a1 100644
> --- a/hw/boards.h
> +++ b/hw/boards.h
> @@ -33,6 +33,7 @@ typedef struct QEMUMachine {
>  } QEMUMachine;
>
>  int qemu_register_machine(QEMUMachine *m);
> +QEMUMachine *find_default_machine(void);
>
>  extern QEMUMachine *current_machine;
>
> diff --git a/hw/pc.c b/hw/pc.c
> index eb4c2d8..ce97eb7 100644
> --- a/hw/pc.c
> +++ b/hw/pc.c
> @@ -57,10 +57,6 @@
>  #define DPRINTF(fmt, ...)
>  #endif
>
> -#define BIOS_FILENAME "bios.bin"
> -
> -#define PC_MAX_BIOS_SIZE (4 * 1024 * 1024)
> -
>  /* Leave a chunk of memory at the top of RAM for the BIOS ACPI tables.  */
>  #define ACPI_DATA_SIZE       0x10000
>  #define BIOS_CFG_IOPORT 0x510
> @@ -976,11 +972,9 @@ void pc_memory_init(MemoryRegion *system_memory,
>                     MemoryRegion *rom_memory,
>                     MemoryRegion **ram_memory)
>  {
> -    char *filename;
> -    int ret, linux_boot, i;
> -    MemoryRegion *ram, *bios, *isa_bios, *option_rom_mr;
> +    int linux_boot, i;
> +    MemoryRegion *ram, *option_rom_mr;
>     MemoryRegion *ram_below_4g, *ram_above_4g;
> -    int bios_size, isa_bios_size;
>     void *fw_cfg;
>
>     linux_boot = (kernel_filename != NULL);
> @@ -1005,43 +999,9 @@ void pc_memory_init(MemoryRegion *system_memory,
>                                     ram_above_4g);
>     }
>
> -    /* BIOS load */
> -    if (bios_name == NULL)
> -        bios_name = BIOS_FILENAME;
> -    filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
> -    if (filename) {
> -        bios_size = get_image_size(filename);
> -    } else {
> -        bios_size = -1;
> -    }
> -    if (bios_size <= 0 ||
> -        (bios_size % 65536) != 0) {
> -        goto bios_error;
> -    }
> -    bios = g_malloc(sizeof(*bios));
> -    memory_region_init_ram(bios, NULL, "pc.bios", bios_size);
> -    memory_region_set_readonly(bios, true);
> -    ret = rom_add_file_fixed(bios_name, (uint32_t)(-bios_size), -1);
> -    if (ret != 0) {
> -    bios_error:
> -        fprintf(stderr, "qemu: could not load PC BIOS '%s'\n", bios_name);
> -        exit(1);
> -    }
> -    if (filename) {
> -        g_free(filename);
> -    }
> -    /* map the last 128KB of the BIOS in ISA space */
> -    isa_bios_size = bios_size;
> -    if (isa_bios_size > (128 * 1024))
> -        isa_bios_size = 128 * 1024;
> -    isa_bios = g_malloc(sizeof(*isa_bios));
> -    memory_region_init_alias(isa_bios, "isa-bios", bios,
> -                             bios_size - isa_bios_size, isa_bios_size);
> -    memory_region_add_subregion_overlap(rom_memory,
> -                                        0x100000 - isa_bios_size,
> -                                        isa_bios,
> -                                        1);
> -    memory_region_set_readonly(isa_bios, true);
> +
> +    /* Initialize ROM or flash ranges for PC firmware */
> +    pc_system_firmware_init(rom_memory);
>
>     option_rom_mr = g_malloc(sizeof(*option_rom_mr));
>     memory_region_init_ram(option_rom_mr, NULL, "pc.rom", PC_ROM_SIZE);
> @@ -1050,11 +1010,6 @@ void pc_memory_init(MemoryRegion *system_memory,
>                                         option_rom_mr,
>                                         1);
>
> -    /* map all the bios at the top of memory */
> -    memory_region_add_subregion(rom_memory,
> -                                (uint32_t)(-bios_size),
> -                                bios);
> -
>     fw_cfg = bochs_bios_init();
>     rom_set_fw(fw_cfg);
>
> diff --git a/hw/pc.h b/hw/pc.h
> index 4515006..b98d734 100644
> --- a/hw/pc.h
> +++ b/hw/pc.h
> @@ -244,6 +244,9 @@ static inline bool isa_ne2000_init(int base, int irq, NICInfo *nd)
>     return true;
>  }
>
> +/* pcflash.c */
> +void pc_system_firmware_init(MemoryRegion *rom_memory);
> +
>  /* e820 types */
>  #define E820_RAM        1
>  #define E820_RESERVED   2
> diff --git a/hw/pc_sysfw.c b/hw/pc_sysfw.c
> new file mode 100644
> index 0000000..21b35c6
> --- /dev/null
> +++ b/hw/pc_sysfw.c
> @@ -0,0 +1,196 @@
> +/*
> + * QEMU PC System Firmware
> + *
> + * Copyright (c) 2003-2004 Fabrice Bellard
> + * Copyright (c) 2011 Intel Corporation
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a copy
> + * of this software and associated documentation files (the "Software"), to deal
> + * in the Software without restriction, including without limitation the rights
> + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
> + * copies of the Software, and to permit persons to whom the Software is
> + * furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice shall be included in
> + * all copies or substantial portions of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
> + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
> + * THE SOFTWARE.
> + */
> +
> +#include "hw.h"
> +#include "pc.h"
> +#include "hw/boards.h"
> +#include "loader.h"
> +#include "sysemu.h"
> +#include "flash.h"
> +#include "kvm.h"
> +
> +#define BIOS_FILENAME "bios.bin"
> +
> +static void pc_isa_bios_init(MemoryRegion *rom_memory,
> +                             MemoryRegion *flash_mem,
> +                             int ram_size)
> +{
> +    int isa_bios_size;
> +    MemoryRegion *isa_bios;
> +    uint64_t flash_size;
> +    void *flash_ptr, *isa_bios_ptr;
> +
> +    flash_size = memory_region_size(flash_mem);
> +
> +    /* map the last 128KB of the BIOS in ISA space */
> +    isa_bios_size = flash_size;
> +    if (isa_bios_size > (128 * 1024)) {
> +        isa_bios_size = 128 * 1024;
> +    }
> +    isa_bios = g_malloc(sizeof(*isa_bios));
> +    memory_region_init_ram(isa_bios, NULL, "isa-bios", isa_bios_size);
> +    memory_region_add_subregion_overlap(rom_memory,
> +                                        0x100000 - isa_bios_size,
> +                                        isa_bios,
> +                                        1);
> +
> +    /* copy ISA rom image from top of flash memory */
> +    flash_ptr = memory_region_get_ram_ptr(flash_mem);
> +    isa_bios_ptr = memory_region_get_ram_ptr(isa_bios);
> +    memcpy(isa_bios_ptr,
> +           ((uint8_t*)flash_ptr) + (flash_size - isa_bios_size),
> +           isa_bios_size);
> +
> +    memory_region_set_readonly(isa_bios, true);
> +}
> +
> +static void pc_fw_add_pflash_drv(void)
> +{
> +    QemuOpts *opts;
> +    QEMUMachine *machine;
> +    char *filename;
> +
> +    if (bios_name == NULL) {
> +        bios_name = BIOS_FILENAME;
> +    }
> +    filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
> +
> +    opts = drive_add(IF_PFLASH, -1, filename, "readonly=on");
> +    if (opts == NULL) {
> +      return;
> +    }
> +
> +    machine = find_default_machine();
> +    if (machine == NULL) {
> +      return;
> +    }
> +
> +    drive_init(opts, machine->use_scsi);
> +}
> +
> +static void pc_system_flash_init(MemoryRegion *rom_memory,
> +                                 DriveInfo *pflash_drv)
> +{
> +    BlockDriverState *bdrv;
> +    int64_t size;
> +    target_phys_addr_t phys_addr;
> +    int sector_bits, sector_size;
> +    pflash_t *system_flash;
> +    MemoryRegion *flash_mem;
> +
> +    bdrv = pflash_drv->bdrv;
> +    size = bdrv_getlength(pflash_drv->bdrv);
> +    sector_bits = 12;
> +    sector_size = 1 << sector_bits;
> +
> +    if ((size % sector_size) != 0) {
> +        fprintf(stderr,
> +                "qemu: PC system firmware (pflash) must be a multiple of 0x%x\n",
> +                sector_size);
> +        exit(1);
> +    }
> +
> +    phys_addr = 0x100000000ULL - size;
> +    system_flash = pflash_cfi01_register(phys_addr, NULL, "system.flash", size,
> +                                         bdrv, sector_size, size >> sector_bits,
> +                                         1, 0x0000, 0x0000, 0x0000, 0x0000, 0);
> +    flash_mem = pflash_cfi01_get_memory(system_flash);
> +
> +    pc_isa_bios_init(rom_memory, flash_mem, size);
> +}
> +
> +static void pc_system_rom_init(MemoryRegion *rom_memory,
> +                               DriveInfo *pflash_drv)
> +{
> +    BlockDriverState *bdrv;
> +    int64_t size;
> +    target_phys_addr_t phys_addr;
> +    int sector_bits, sector_size;
> +    MemoryRegion *sys_rom;
> +    void *buffer;
> +    int ret;
> +
> +    bdrv = pflash_drv->bdrv;
> +    size = bdrv_getlength(pflash_drv->bdrv);
> +    sector_bits = 9;
> +    sector_size = 1 << sector_bits;
> +
> +    if ((size % sector_size) != 0) {
> +        fprintf(stderr,
> +                "qemu: PC system rom (pflash) must be a multiple of 0x%x\n",
> +                sector_size);
> +        exit(1);
> +    }
> +
> +    phys_addr = 0x100000000ULL - size;
> +    sys_rom = g_malloc(sizeof(*sys_rom));
> +    memory_region_init_ram(sys_rom, NULL, "system.rom", size);
> +    buffer = memory_region_get_ram_ptr(sys_rom);
> +    memory_region_add_subregion(rom_memory, phys_addr, sys_rom);
> +    printf("rom: added from pflash drive @ 0x%lx\n", phys_addr);

Whoops.  I will remove this debug print in v8.  I wait about a week to
see if any other feedback comes in.

> +
> +    /* read the rom content */
> +    ret = bdrv_read(bdrv, 0, buffer, size >> sector_bits);
> +    if (ret < 0) {
> +        memory_region_destroy(sys_rom);
> +        g_free(sys_rom);
> +        fprintf(stderr,
> +                "qemu: Failed to read rom image from pflash drive\n");
> +        exit(1);
> +    }
> +    printf("rom: read from pflash drive\n");

Same here.

-Jordan

> +
> +    memory_region_set_readonly(sys_rom, true);
> +
> +    pc_isa_bios_init(rom_memory, sys_rom, size);
> +}
> +
> +void pc_system_firmware_init(MemoryRegion *rom_memory)
> +{
> +    int flash_present;
> +    DriveInfo *pflash_drv;
> +
> +    pflash_drv = drive_get(IF_PFLASH, 0, 0);
> +    flash_present = (pflash_drv != NULL);
> +
> +    if (!flash_present) {
> +        pc_fw_add_pflash_drv();
> +        pflash_drv = drive_get(IF_PFLASH, 0, 0);
> +        flash_present = (pflash_drv != NULL);
> +    }
> +
> +    if (!flash_present) {
> +        fprintf(stderr, "qemu: PC system firmware (pflash) not available\n");
> +        exit(1);
> +    }
> +
> +    if (!kvm_enabled()) {
> +        pc_system_flash_init(rom_memory, pflash_drv);
> +    } else {
> +        pc_system_rom_init(rom_memory, pflash_drv);
> +    }
> +}
> +
> +
> diff --git a/vl.c b/vl.c
> index 624da0f..8a6032e 100644
> --- a/vl.c
> +++ b/vl.c
> @@ -1183,7 +1183,7 @@ static QEMUMachine *find_machine(const char *name)
>     return NULL;
>  }
>
> -static QEMUMachine *find_default_machine(void)
> +QEMUMachine *find_default_machine(void)
>  {
>     QEMUMachine *m;
>
> --
> 1.7.1
>
>
>

Re: [Qemu-devel] [PATCH v7 0/2] PC system flash support

[Jordan Justen]

[-- Attachment #1: Type: text/plain, Size: 2323 bytes --]

Cc: qemu-devel

On Fri, Nov 4, 2011 at 22:37, Zhi Yong Wu <zwu.kernel@gmail.com> wrote:
> On Sat, Nov 5, 2011 at 12:11 AM, Jordan Justen <jljusten@gmail.com> wrote:
>> On Fri, Nov 4, 2011 at 04:34, Zhi Yong Wu <zwu.kernel@gmail.com> wrote:
>>> BTW: what is the relationship between -bios and -pflash?
>>
>> Previously the QEMU/KVM PC system had no pflash support.  You could
>> specify a pflash drive, but it would not appear in the VM.
>>
>> Also, previously the -bios flag would cause the specified binary to be
>> loaded by QEMU, and then it was put into a memory region to be used
>> for the firmware.
>>
>> After this change, the pflash drive is used for firmware.  So, it
> This pflash drive is created with -pflash option, right?

-pflash can be used, but I think it is just a short cut.

-pflash /path/to/file
is similar to:
-drive if=pflash,file=/path/to/file

And, after this change,
-bios /path/to/file
is similar to:
-drive if=pflash,file=/path/to/file,readonly=on

>> should be able to support qcow2, since qemu drives support the
>> different formats.

I confirmed that you can use a qcow2 image with -bios after this change.

>> For backward compatibility, this change makes the -bios parameter be
>> another way to specify the pflash drive.  If -bios is used, then a
>> read-only pflash drive is created.
> Sorry, i don't fully understand this. How about -bios and -pflash are
> both specified.

In this case the -pflash will be used, and -bios will be ignored.  I
use -bios to create a pflash drive only if no pflash drive exists
already.

I think this should be okay, since -pflash has no use in the QEMU PC
system before this patch, so it is unlikely that both -pflash and
-bios will be used previously.

>>> If your patch is applied to my source tree, can you know how to use -pflash?
> Sorry, i made a mistake. I wanted to ask you how to use -pflash if
> your patch is not applied.

I don't think you can use pflash in a PC system when my patch is not
applied.  I think without the patch qemu will create the pflash drive
internally, but it will not be hooked to a device that the emulated PC
system can see.

I attached a log of me interacting with the pflash device under the
EFI shell on OVMF *with* the patch applied.

Thanks,

-Jordan

[-- Attachment #2: ovmf-flash-example-annotated.txt --]
[-- Type: text/plain, Size: 3019 bytes --]

Notes below refer to quoted item just above.

> Device mapping table
>   blk0 :Floppy - Alias (null)
>         PciRoot(0x0)/Pci(0x1,0x0)/Floppy(0x0)
>   blk1 :Floppy - Alias (null)
>         PciRoot(0x0)/Pci(0x1,0x0)/Floppy(0x1)
>   blk2 :BlockDevice - Alias (null)
>         PciRoot(0x0)/Pci(0x1,0x1)/Ata(Secondary,Master,0x0)
>
>
> Press ESC in 5 seconds to skip startup.nsh, any other key to continue.
> Press ESC in 4 seconds to skip startup.nsh, any other key to continue.

EFI shell started

> Shell> mem fffe0 32
>   Memory Address 00000000000FFFE0 20 Bytes
>   000FFFE0: EB C3 90 90 90 90 90 90-00 00 00 00 56 54 46 00  *............VTF.*
>   000FFFF0: 90 90 EB AC 90 90 90 90-90 90 90 90 90 90 90 90  *................*

Dump firmware range in legacy F000 segment

> Shell> mem ffffffe0 32
>   Memory Address 00000000FFFFFFE0 20 Bytes
>   FFFFFFE0: EB C3 90 90 90 90 90 90-00 00 00 00 56 54 46 00  *............VTF.*
>   FFFFFFF0: 90 90 EB AC 90 90 90 90-90 90 90 90 90 90 90 90  *................*

Dump firmware range at top of 4GB.

> Shell> mem fff00000 32
>   Memory Address 00000000FFF00000 20 Bytes
>   FFF00000: 01 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00  *................*
>   FFF00010: 78 E5 8C 8C 3D 8A 1C 4F-99 35 89 61 85 C3 2D D3  *x...=..O.5.a..-.*

Dump start of OVMF flash image.  The first 16 bytes are
reserved, and therefore we can program them without a
negative side effect.  Notice I have previously programmed
the first byte from 00 to 01.

> Shell> mm -mmio -w 1 -n fff00000
> MMIO  0x00000000FFF00000 : 0x01

Read the data in the first byte of the rom.

> Shell> mm -mmio -w 1 -n fff00000 70

Request to read the pflash_cfi01 status register.
(0x70 is the command written to address 0xfff00000.)

> Shell> mm -mmio -w 1 -n fff00000
> MMIO  0x00000000FFF00000 : 0x00

Read the status register by reading address 0xfff00000.

> Shell> mm -mmio -w 1 -n fff00000 ff

Put the pflash_cfi01 back into read-data mode.
(0xff is the command for putting the flash into read mode.)

> Shell> mm -mmio -w 1 -n fff00000
> MMIO  0x00000000FFF00000 : 0x01

Notice we read the proper data again...  0x01.

> Shell> mm -mmio -w 1 -n fff00001
> MMIO  0x00000000FFF00001 : 0x00

Now read the data at 0xfff00001.  It is 0x00.

> Shell> mm -mmio -w 1 -n fff00001 10

Put the pflash_cfi01 into programming mode.

> Shell> mm -mmio -w 1 -n fff00001 ab

Program the data at 0xfff00001.  Data is 0xab.

> Shell> mm -mmio -w 1 -n fff00001 ff

Put the pflash_cfi01 back into read-data mode.

> Shell> mm -mmio -w 1 -n fff00001
> MMIO  0x00000000FFF00001 : 0xAB

0xab was programmed into 0xfff00001.

> Shell> mm -mmio -w 1 -n fff00001 70

Request to read the status register.

> Shell> mm -mmio -w 1 -n fff00001
> MMIO  0x00000000FFF00001 : 0x80

bit7 (0x80) indicates device is ready.

> Shell> mm -mmio -w 1 -n fff00001 ff

Back to read-data mode again.

> Shell> mm -mmio -w 1 -n fff00001
> MMIO  0x00000000FFF00001 : 0xAB

The proper data is still returned.

> Shell> reset -s

Shutdown the system...

Re: [Qemu-devel] [PATCH v7 0/2] PC system flash support

[Zhi Yong Wu]

On Sun, Nov 6, 2011 at 5:30 AM, Jordan Justen <jljusten@gmail.com> wrote:
> Cc: qemu-devel
>
> On Fri, Nov 4, 2011 at 22:37, Zhi Yong Wu <zwu.kernel@gmail.com> wrote:
>> On Sat, Nov 5, 2011 at 12:11 AM, Jordan Justen <jljusten@gmail.com> wrote:
>>> On Fri, Nov 4, 2011 at 04:34, Zhi Yong Wu <zwu.kernel@gmail.com> wrote:
>>>> BTW: what is the relationship between -bios and -pflash?
>>>
>>> Previously the QEMU/KVM PC system had no pflash support.  You could
>>> specify a pflash drive, but it would not appear in the VM.
>>>
>>> Also, previously the -bios flag would cause the specified binary to be
>>> loaded by QEMU, and then it was put into a memory region to be used
>>> for the firmware.
>>>
>>> After this change, the pflash drive is used for firmware.  So, it
>> This pflash drive is created with -pflash option, right?
>
> -pflash can be used, but I think it is just a short cut.
>
> -pflash /path/to/file
> is similar to:
> -drive if=pflash,file=/path/to/file
>
> And, after this change,
> -bios /path/to/file
> is similar to:
> -drive if=pflash,file=/path/to/file,readonly=on
>
>>> should be able to support qcow2, since qemu drives support the
>>> different formats.
>
> I confirmed that you can use a qcow2 image with -bios after this change.
>
>>> For backward compatibility, this change makes the -bios parameter be
>>> another way to specify the pflash drive.  If -bios is used, then a
>>> read-only pflash drive is created.
>> Sorry, i don't fully understand this. How about -bios and -pflash are
>> both specified.
>
> In this case the -pflash will be used, and -bios will be ignored.  I
> use -bios to create a pflash drive only if no pflash drive exists
> already.
>
> I think this should be okay, since -pflash has no use in the QEMU PC
> system before this patch, so it is unlikely that both -pflash and
> -bios will be used previously.
>
>>>> If your patch is applied to my source tree, can you know how to use -pflash?
>> Sorry, i made a mistake. I wanted to ask you how to use -pflash if
>> your patch is not applied.
>
> I don't think you can use pflash in a PC system when my patch is not
> applied.  I think without the patch qemu will create the pflash drive
> internally, but it will not be hooked to a device that the emulated PC
> system can see.
>
> I attached a log of me interacting with the pflash device under the
> EFI shell on OVMF *with* the patch applied.
>
Great, thanks a lot. Let me try next week.

> Thanks,
>
> -Jordan
>



-- 
Regards,

Zhi Yong Wu

Re: [Qemu-devel] [PATCH v7 0/2] PC system flash support

[Zhi Yong Wu]

Reviewed-by and Tested-by: Zhi Yong Wu <zwu.kernel@gmail.com>

On Thu, Nov 3, 2011 at 12:19 PM, Jordan Justen
<jordan.l.justen@intel.com> wrote:
> Enable flash emulation in a PC system using pflash_cfi01.
>
> v7:
> * Do not add system firmware to qemu roms
> * If kvm is enabled, copy pflash drive contents into a
>  read-only ram region, since kvm cannot currently execute
>  code from a pflash device.
> * Rename pcflash.c to pc_sysfw.c
>
> v6:
> * Rebase for memory API
> * pflash_cfi01: Set error in status register when a write or
>  erase is attempted in read-only mode.
> * Add system firmware to qemu roms
>
> v5:
> * Enable pflash read-only mode
> * Enable -drive with if=pflash to define system firmware image
>
> v4:
> * Rebase
>
> v3:
> * Fix code style issues
> * Add additional comments
>
> v2:
> * Convert debug printf to DPRINTF
>
> Jordan Justen (2):
>  pflash: Support read-only mode
>  pc: Support system flash memory with pflash
>
>  Makefile.target                    |    1 +
>  blockdev.c                         |    3 +-
>  default-configs/i386-softmmu.mak   |    1 +
>  default-configs/x86_64-softmmu.mak |    1 +
>  hw/boards.h                        |    1 +
>  hw/pc.c                            |   55 +---------
>  hw/pc.h                            |    3 +
>  hw/pc_sysfw.c                      |  196 ++++++++++++++++++++++++++++++++++++
>  hw/pflash_cfi01.c                  |   44 ++++++---
>  hw/pflash_cfi02.c                  |   83 ++++++++-------
>  vl.c                               |    2 +-
>  11 files changed, 286 insertions(+), 104 deletions(-)
>  create mode 100644 hw/pc_sysfw.c
>
>
>



-- 
Regards,

Zhi Yong Wu