cryptospore / rpms / qemu-kvm

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From b9968ba04f7d8528d07c49bf523474ac4cb63acd Mon Sep 17 00:00:00 2001
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From: Laszlo Ersek <lersek@redhat.com>
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Date: Wed, 29 Jan 2014 07:06:24 +0100
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Subject: [PATCH 12/22] pc_sysfw: do not make it a device anymore
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Message-id: <1389463208-6278-13-git-send-email-lersek@redhat.com>
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Patchwork-id: 56625
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O-Subject: [RHEL-7.0 qemu-kvm PATCH 12/18] pc_sysfw: do not make it a device anymore
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Bugzilla: 1032346
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Amos Kong <akong@redhat.com>
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RH-Acked-by: Andrew Jones <drjones@redhat.com>
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From: Paolo Bonzini <pbonzini@redhat.com>
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Move the code to hw/i386, the sole remaining property is available
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as !pci_enabled.
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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Signed-off-by: Markus Armbruster <armbru@redhat.com>
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Message-id: 1376069702-22330-4-git-send-email-aliguori@us.ibm.com
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Rebased.
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Signed-off-by: Markus Armbruster <armbru@redhat.com>
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Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
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(cherry picked from commit 6dd2a5c98a6b1c9189d342bcc3493c9b5dd1217e)
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Conflicts:
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	hw/block/Makefile.objs
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	hw/i386/pc_q35.c
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	include/hw/i386/pc.h
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Signed-off-by: Laszlo Ersek <lersek@redhat.com>
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---
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 hw/block/Makefile.objs             |  1 -
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 hw/i386/Makefile.objs              |  1 +
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 include/hw/i386/pc.h               |  4 ++-
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 hw/i386/pc.c                       |  2 +-
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 hw/i386/pc_piix.c                  |  6 +----
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 hw/i386/pc_q35.c                   |  1 +
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 hw/{block => i386}/pc_sysfw.c      | 52 +++-----------------------------------
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 default-configs/i386-softmmu.mak   |  1 -
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 default-configs/x86_64-softmmu.mak |  1 -
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 9 files changed, 10 insertions(+), 59 deletions(-)
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 rename hw/{block => i386}/pc_sysfw.c (81%)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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 default-configs/i386-softmmu.mak   |    1 -
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 default-configs/x86_64-softmmu.mak |    1 -
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 hw/block/Makefile.objs             |    1 -
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 hw/block/pc_sysfw.c                |  231 ------------------------------------
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 hw/i386/Makefile.objs              |    1 +
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 hw/i386/pc.c                       |    2 +-
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 hw/i386/pc_piix.c                  |    6 +-
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 hw/i386/pc_q35.c                   |    1 +
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 hw/i386/pc_sysfw.c                 |  185 +++++++++++++++++++++++++++++
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 include/hw/i386/pc.h               |    4 +-
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 10 files changed, 192 insertions(+), 241 deletions(-)
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 delete mode 100644 hw/block/pc_sysfw.c
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 create mode 100644 hw/i386/pc_sysfw.c
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diff --git a/default-configs/i386-softmmu.mak b/default-configs/i386-softmmu.mak
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index 03deca2..fb84f80 100644
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--- a/default-configs/i386-softmmu.mak
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+++ b/default-configs/i386-softmmu.mak
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@@ -34,7 +34,6 @@ CONFIG_PAM=y
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 CONFIG_PCI_PIIX=y
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 CONFIG_PCI_HOTPLUG=y
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 CONFIG_WDT_IB700=y
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-CONFIG_PC_SYSFW=y
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 CONFIG_XEN_I386=$(CONFIG_XEN)
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 CONFIG_ISA_DEBUG=y
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 CONFIG_ISA_TESTDEV=y
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diff --git a/default-configs/x86_64-softmmu.mak b/default-configs/x86_64-softmmu.mak
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index 7b8b05c..a6fdf84 100644
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--- a/default-configs/x86_64-softmmu.mak
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+++ b/default-configs/x86_64-softmmu.mak
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@@ -27,7 +27,6 @@ CONFIG_PAM=y
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 CONFIG_PCI_PIIX=y
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 CONFIG_PCI_HOTPLUG=y
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 CONFIG_WDT_IB700=y
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-CONFIG_PC_SYSFW=y
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 CONFIG_XEN_I386=$(CONFIG_XEN)
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 CONFIG_ISA_DEBUG=y
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 CONFIG_ISA_TESTDEV=y
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diff --git a/hw/block/Makefile.objs b/hw/block/Makefile.objs
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index e4329a0..94491bf 100644
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--- a/hw/block/Makefile.objs
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+++ b/hw/block/Makefile.objs
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@@ -7,7 +7,6 @@ common-obj-$(CONFIG_PFLASH_CFI02) += pflash_cfi02.o
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 common-obj-$(CONFIG_XEN_BACKEND) += xen_disk.o
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 common-obj-$(CONFIG_ECC) += ecc.o
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 common-obj-$(CONFIG_ONENAND) += onenand.o
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-common-obj-$(CONFIG_PC_SYSFW) += pc_sysfw.o
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 obj-$(CONFIG_SH4) += tc58128.o
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diff --git a/hw/block/pc_sysfw.c b/hw/block/pc_sysfw.c
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deleted file mode 100644
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index f9c0633..0000000
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--- a/hw/block/pc_sysfw.c
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+++ /dev/null
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@@ -1,231 +0,0 @@
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-/*
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- * QEMU PC System Firmware
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- *
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- * Copyright (c) 2003-2004 Fabrice Bellard
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- * Copyright (c) 2011-2012 Intel Corporation
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- *
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- * Permission is hereby granted, free of charge, to any person obtaining a copy
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- * of this software and associated documentation files (the "Software"), to deal
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- * in the Software without restriction, including without limitation the rights
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- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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- * copies of the Software, and to permit persons to whom the Software is
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- * furnished to do so, subject to the following conditions:
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- *
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- * The above copyright notice and this permission notice shall be included in
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- * all copies or substantial portions of the Software.
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- *
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- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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- * THE SOFTWARE.
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- */
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-
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-#include "sysemu/blockdev.h"
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-#include "qemu/error-report.h"
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-#include "hw/sysbus.h"
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-#include "hw/hw.h"
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-#include "hw/i386/pc.h"
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-#include "hw/boards.h"
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-#include "hw/loader.h"
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-#include "sysemu/sysemu.h"
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-#include "hw/block/flash.h"
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-#include "sysemu/kvm.h"
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-
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-#define BIOS_FILENAME "bios.bin"
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-
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-typedef struct PcSysFwDevice {
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-    SysBusDevice busdev;
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-    uint8_t isapc_ram_fw;
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-} PcSysFwDevice;
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-
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-static void pc_isa_bios_init(MemoryRegion *rom_memory,
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-                             MemoryRegion *flash_mem,
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-                             int ram_size)
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-{
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-    int isa_bios_size;
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-    MemoryRegion *isa_bios;
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-    uint64_t flash_size;
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-    void *flash_ptr, *isa_bios_ptr;
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-
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-    flash_size = memory_region_size(flash_mem);
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-
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-    /* map the last 128KB of the BIOS in ISA space */
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-    isa_bios_size = MIN(flash_size, 128 * 1024);
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-    isa_bios = g_malloc(sizeof(*isa_bios));
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-    memory_region_init_ram(isa_bios, "isa-bios", isa_bios_size);
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-    vmstate_register_ram_global(isa_bios);
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-    memory_region_add_subregion_overlap(rom_memory,
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-                                        0x100000 - isa_bios_size,
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-                                        isa_bios,
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-                                        1);
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-
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-    /* copy ISA rom image from top of flash memory */
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-    flash_ptr = memory_region_get_ram_ptr(flash_mem);
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-    isa_bios_ptr = memory_region_get_ram_ptr(isa_bios);
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-    memcpy(isa_bios_ptr,
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-           ((uint8_t*)flash_ptr) + (flash_size - isa_bios_size),
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-           isa_bios_size);
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-
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-    memory_region_set_readonly(isa_bios, true);
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-}
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-
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-static void pc_system_flash_init(MemoryRegion *rom_memory,
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-                                 DriveInfo *pflash_drv)
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-{
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-    BlockDriverState *bdrv;
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-    int64_t size;
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-    hwaddr phys_addr;
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-    int sector_bits, sector_size;
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-    pflash_t *system_flash;
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-    MemoryRegion *flash_mem;
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-
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-    bdrv = pflash_drv->bdrv;
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-    size = bdrv_getlength(pflash_drv->bdrv);
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-    sector_bits = 12;
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-    sector_size = 1 << sector_bits;
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-
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-    if ((size % sector_size) != 0) {
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-        fprintf(stderr,
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-                "qemu: PC system firmware (pflash) must be a multiple of 0x%x\n",
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-                sector_size);
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-        exit(1);
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-    }
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-
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-    phys_addr = 0x100000000ULL - size;
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-    system_flash = pflash_cfi01_register(phys_addr, NULL, "system.flash", size,
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-                                         bdrv, sector_size, size >> sector_bits,
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-                                         1, 0x0000, 0x0000, 0x0000, 0x0000, 0);
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-    flash_mem = pflash_cfi01_get_memory(system_flash);
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-
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-    pc_isa_bios_init(rom_memory, flash_mem, size);
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-}
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-
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-static void old_pc_system_rom_init(MemoryRegion *rom_memory, bool isapc_ram_fw)
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-{
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-    char *filename;
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-    MemoryRegion *bios, *isa_bios;
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-    int bios_size, isa_bios_size;
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-    int ret;
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-
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-    /* BIOS load */
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-    if (bios_name == NULL) {
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-        bios_name = BIOS_FILENAME;
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-    }
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-    filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
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-    if (filename) {
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-        bios_size = get_image_size(filename);
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-    } else {
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-        bios_size = -1;
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-    }
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-    if (bios_size <= 0 ||
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-        (bios_size % 65536) != 0) {
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-        goto bios_error;
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-    }
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-    bios = g_malloc(sizeof(*bios));
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-    memory_region_init_ram(bios, "pc.bios", bios_size);
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-    vmstate_register_ram_global(bios);
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-    if (!isapc_ram_fw) {
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-        memory_region_set_readonly(bios, true);
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-    }
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-    ret = rom_add_file_fixed(bios_name, (uint32_t)(-bios_size), -1);
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-    if (ret != 0) {
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-    bios_error:
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-        fprintf(stderr, "qemu: could not load PC BIOS '%s'\n", bios_name);
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-        exit(1);
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-    }
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-    if (filename) {
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-        g_free(filename);
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-    }
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-
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-    /* map the last 128KB of the BIOS in ISA space */
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-    isa_bios_size = bios_size;
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-    if (isa_bios_size > (128 * 1024)) {
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-        isa_bios_size = 128 * 1024;
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-    }
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-    isa_bios = g_malloc(sizeof(*isa_bios));
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-    memory_region_init_alias(isa_bios, "isa-bios", bios,
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-                             bios_size - isa_bios_size, isa_bios_size);
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-    memory_region_add_subregion_overlap(rom_memory,
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-                                        0x100000 - isa_bios_size,
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-                                        isa_bios,
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-                                        1);
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-    if (!isapc_ram_fw) {
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-        memory_region_set_readonly(isa_bios, true);
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-    }
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-
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-    /* map all the bios at the top of memory */
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-    memory_region_add_subregion(rom_memory,
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-                                (uint32_t)(-bios_size),
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-                                bios);
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-}
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-
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-void pc_system_firmware_init(MemoryRegion *rom_memory)
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-{
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-    DriveInfo *pflash_drv;
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-    PcSysFwDevice *sysfw_dev;
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-
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-    /*
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-     * TODO This device exists only so that users can switch between
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-     * use of flash and ROM for the BIOS.  The ability to switch was
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-     * created because flash doesn't work with KVM.  Once it does, we
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-     * should drop this device.
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-     */
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-    sysfw_dev = (PcSysFwDevice*) qdev_create(NULL, "pc-sysfw");
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-
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-    qdev_init_nofail(DEVICE(sysfw_dev));
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-
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-    pflash_drv = drive_get(IF_PFLASH, 0, 0);
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-
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-    if (sysfw_dev->isapc_ram_fw || pflash_drv == NULL) {
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-        /* When a pflash drive is not found, use rom-mode */
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-        old_pc_system_rom_init(rom_memory, sysfw_dev->isapc_ram_fw);
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-        return;
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-    }
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-
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-    if (kvm_enabled() && !kvm_readonly_mem_enabled()) {
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-        /* Older KVM cannot execute from device memory. So, flash memory
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-         * cannot be used unless the readonly memory kvm capability is present. */
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-        fprintf(stderr, "qemu: pflash with kvm requires KVM readonly memory support\n");
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-        exit(1);
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-    }
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-
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-    pc_system_flash_init(rom_memory, pflash_drv);
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-}
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-
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-static Property pcsysfw_properties[] = {
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-    DEFINE_PROP_UINT8("isapc_ram_fw", PcSysFwDevice, isapc_ram_fw, 0),
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-    DEFINE_PROP_END_OF_LIST(),
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-};
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-
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-static int pcsysfw_init(DeviceState *dev)
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-{
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-    return 0;
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-}
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-
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-static void pcsysfw_class_init (ObjectClass *klass, void *data)
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-{
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-    DeviceClass *dc = DEVICE_CLASS (klass);
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-
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-    set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
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-    dc->desc = "PC System Firmware";
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-    dc->init = pcsysfw_init;
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-    dc->props = pcsysfw_properties;
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-}
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-
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-static const TypeInfo pcsysfw_info = {
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-    .name          = "pc-sysfw",
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-    .parent        = TYPE_SYS_BUS_DEVICE,
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-    .instance_size = sizeof (PcSysFwDevice),
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-    .class_init    = pcsysfw_class_init,
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-};
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-
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-static void pcsysfw_register (void)
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-{
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-    type_register_static (&pcsysfw_info);
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-}
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-
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-type_init (pcsysfw_register);
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-
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diff --git a/hw/i386/Makefile.objs b/hw/i386/Makefile.objs
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index 6a17cf8..09ac433 100644
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--- a/hw/i386/Makefile.objs
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+++ b/hw/i386/Makefile.objs
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@@ -1,6 +1,7 @@
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 obj-$(CONFIG_KVM) += kvm/
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 obj-y += multiboot.o smbios.o
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 obj-y += pc.o pc_piix.o pc_q35.o
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+obj-y += pc_sysfw.o
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 obj-$(CONFIG_XEN) += xen_domainbuild.o xen_machine_pv.o
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 obj-y += kvmvapic.o
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diff --git a/hw/i386/pc.c b/hw/i386/pc.c
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index 320f668..a0f0b24 100644
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--- a/hw/i386/pc.c
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+++ b/hw/i386/pc.c
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@@ -1162,7 +1162,7 @@ FWCfgState *pc_memory_init(MemoryRegion *system_memory,
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     /* Initialize PC system firmware */
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-    pc_system_firmware_init(rom_memory);
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+    pc_system_firmware_init(rom_memory, guest_info->isapc_ram_fw);
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     option_rom_mr = g_malloc(sizeof(*option_rom_mr));
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     memory_region_init_ram(option_rom_mr, "pc.rom", PC_ROM_SIZE);
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diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
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index 6f273db..641f3d9 100644
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--- a/hw/i386/pc_piix.c
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+++ b/hw/i386/pc_piix.c
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@@ -141,6 +141,7 @@ static void pc_init1(QEMUMachineInitArgs *args,
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     guest_info->has_acpi_build = has_acpi_build;
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     guest_info->has_pci_info = has_pci_info;
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+    guest_info->isapc_ram_fw = !pci_enabled;
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     /* allocate ram and load rom/bios */
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     if (!xen_enabled()) {
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@@ -705,11 +706,6 @@ static QEMUMachine isapc_machine = {
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     .init = pc_init_isa,
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     .max_cpus = 1,
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     .compat_props = (GlobalProperty[]) {
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-        {
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-            .driver   = "pc-sysfw",
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-            .property = "isapc_ram_fw",
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-            .value    = stringify(1),
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-        },
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         { /* end of list */ }
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     },
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     DEFAULT_MACHINE_OPTIONS,
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diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
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index 7e46799..1ac46be 100644
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--- a/hw/i386/pc_q35.c
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+++ b/hw/i386/pc_q35.c
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@@ -114,6 +114,7 @@ static void pc_q35_init(QEMUMachineInitArgs *args)
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     guest_info = pc_guest_info_init(below_4g_mem_size, above_4g_mem_size);
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     guest_info->has_pci_info = has_pci_info;
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     guest_info->has_acpi_build = has_acpi_build;
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+    guest_info->isapc_ram_fw = false;
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     /* allocate ram and load rom/bios */
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     if (!xen_enabled()) {
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diff --git a/hw/i386/pc_sysfw.c b/hw/i386/pc_sysfw.c
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new file mode 100644
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index 0000000..eb56dee
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--- /dev/null
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+++ b/hw/i386/pc_sysfw.c
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@@ -0,0 +1,185 @@
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+/*
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+ * QEMU PC System Firmware
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+ *
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+ * Copyright (c) 2003-2004 Fabrice Bellard
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+ * Copyright (c) 2011-2012 Intel Corporation
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+ *
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+ * Permission is hereby granted, free of charge, to any person obtaining a copy
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+ * of this software and associated documentation files (the "Software"), to deal
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+ * in the Software without restriction, including without limitation the rights
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+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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+ * copies of the Software, and to permit persons to whom the Software is
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+ * furnished to do so, subject to the following conditions:
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+ *
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+ * The above copyright notice and this permission notice shall be included in
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+ * all copies or substantial portions of the Software.
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+ *
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+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
0a122b
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
0a122b
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
0a122b
+ * THE SOFTWARE.
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+ */
0a122b
+
0a122b
+#include "sysemu/blockdev.h"
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+#include "qemu/error-report.h"
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+#include "hw/sysbus.h"
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+#include "hw/hw.h"
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+#include "hw/i386/pc.h"
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+#include "hw/boards.h"
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+#include "hw/loader.h"
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+#include "sysemu/sysemu.h"
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+#include "hw/block/flash.h"
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+#include "sysemu/kvm.h"
0a122b
+
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+#define BIOS_FILENAME "bios.bin"
0a122b
+
0a122b
+typedef struct PcSysFwDevice {
0a122b
+    SysBusDevice busdev;
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+    uint8_t isapc_ram_fw;
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+} PcSysFwDevice;
0a122b
+
0a122b
+static void pc_isa_bios_init(MemoryRegion *rom_memory,
0a122b
+                             MemoryRegion *flash_mem,
0a122b
+                             int ram_size)
0a122b
+{
0a122b
+    int isa_bios_size;
0a122b
+    MemoryRegion *isa_bios;
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+    uint64_t flash_size;
0a122b
+    void *flash_ptr, *isa_bios_ptr;
0a122b
+
0a122b
+    flash_size = memory_region_size(flash_mem);
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+
0a122b
+    /* map the last 128KB of the BIOS in ISA space */
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+    isa_bios_size = MIN(flash_size, 128 * 1024);
0a122b
+    isa_bios = g_malloc(sizeof(*isa_bios));
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+    memory_region_init_ram(isa_bios, "isa-bios", isa_bios_size);
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+    vmstate_register_ram_global(isa_bios);
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+    memory_region_add_subregion_overlap(rom_memory,
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+                                        0x100000 - isa_bios_size,
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+                                        isa_bios,
0a122b
+                                        1);
0a122b
+
0a122b
+    /* copy ISA rom image from top of flash memory */
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+    flash_ptr = memory_region_get_ram_ptr(flash_mem);
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+    isa_bios_ptr = memory_region_get_ram_ptr(isa_bios);
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+    memcpy(isa_bios_ptr,
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+           ((uint8_t*)flash_ptr) + (flash_size - isa_bios_size),
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+           isa_bios_size);
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+
0a122b
+    memory_region_set_readonly(isa_bios, true);
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+}
0a122b
+
0a122b
+static void pc_system_flash_init(MemoryRegion *rom_memory,
0a122b
+                                 DriveInfo *pflash_drv)
0a122b
+{
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+    BlockDriverState *bdrv;
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+    int64_t size;
0a122b
+    hwaddr phys_addr;
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+    int sector_bits, sector_size;
0a122b
+    pflash_t *system_flash;
0a122b
+    MemoryRegion *flash_mem;
0a122b
+
0a122b
+    bdrv = pflash_drv->bdrv;
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+    size = bdrv_getlength(pflash_drv->bdrv);
0a122b
+    sector_bits = 12;
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+    sector_size = 1 << sector_bits;
0a122b
+
0a122b
+    if ((size % sector_size) != 0) {
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+        fprintf(stderr,
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+                "qemu: PC system firmware (pflash) must be a multiple of 0x%x\n",
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+                sector_size);
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+        exit(1);
0a122b
+    }
0a122b
+
0a122b
+    phys_addr = 0x100000000ULL - size;
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+    system_flash = pflash_cfi01_register(phys_addr, NULL, "system.flash", size,
0a122b
+                                         bdrv, sector_size, size >> sector_bits,
0a122b
+                                         1, 0x0000, 0x0000, 0x0000, 0x0000, 0);
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+    flash_mem = pflash_cfi01_get_memory(system_flash);
0a122b
+
0a122b
+    pc_isa_bios_init(rom_memory, flash_mem, size);
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+}
0a122b
+
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+static void old_pc_system_rom_init(MemoryRegion *rom_memory, bool isapc_ram_fw)
0a122b
+{
0a122b
+    char *filename;
0a122b
+    MemoryRegion *bios, *isa_bios;
0a122b
+    int bios_size, isa_bios_size;
0a122b
+    int ret;
0a122b
+
0a122b
+    /* BIOS load */
0a122b
+    if (bios_name == NULL) {
0a122b
+        bios_name = BIOS_FILENAME;
0a122b
+    }
0a122b
+    filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
0a122b
+    if (filename) {
0a122b
+        bios_size = get_image_size(filename);
0a122b
+    } else {
0a122b
+        bios_size = -1;
0a122b
+    }
0a122b
+    if (bios_size <= 0 ||
0a122b
+        (bios_size % 65536) != 0) {
0a122b
+        goto bios_error;
0a122b
+    }
0a122b
+    bios = g_malloc(sizeof(*bios));
0a122b
+    memory_region_init_ram(bios, "pc.bios", bios_size);
0a122b
+    vmstate_register_ram_global(bios);
0a122b
+    if (!isapc_ram_fw) {
0a122b
+        memory_region_set_readonly(bios, true);
0a122b
+    }
0a122b
+    ret = rom_add_file_fixed(bios_name, (uint32_t)(-bios_size), -1);
0a122b
+    if (ret != 0) {
0a122b
+    bios_error:
0a122b
+        fprintf(stderr, "qemu: could not load PC BIOS '%s'\n", bios_name);
0a122b
+        exit(1);
0a122b
+    }
0a122b
+    if (filename) {
0a122b
+        g_free(filename);
0a122b
+    }
0a122b
+
0a122b
+    /* map the last 128KB of the BIOS in ISA space */
0a122b
+    isa_bios_size = bios_size;
0a122b
+    if (isa_bios_size > (128 * 1024)) {
0a122b
+        isa_bios_size = 128 * 1024;
0a122b
+    }
0a122b
+    isa_bios = g_malloc(sizeof(*isa_bios));
0a122b
+    memory_region_init_alias(isa_bios, "isa-bios", bios,
0a122b
+                             bios_size - isa_bios_size, isa_bios_size);
0a122b
+    memory_region_add_subregion_overlap(rom_memory,
0a122b
+                                        0x100000 - isa_bios_size,
0a122b
+                                        isa_bios,
0a122b
+                                        1);
0a122b
+    if (!isapc_ram_fw) {
0a122b
+        memory_region_set_readonly(isa_bios, true);
0a122b
+    }
0a122b
+
0a122b
+    /* map all the bios at the top of memory */
0a122b
+    memory_region_add_subregion(rom_memory,
0a122b
+                                (uint32_t)(-bios_size),
0a122b
+                                bios);
0a122b
+}
0a122b
+
0a122b
+void pc_system_firmware_init(MemoryRegion *rom_memory, bool isapc_ram_fw)
0a122b
+{
0a122b
+    DriveInfo *pflash_drv;
0a122b
+
0a122b
+    pflash_drv = drive_get(IF_PFLASH, 0, 0);
0a122b
+
0a122b
+    if (isapc_ram_fw || pflash_drv == NULL) {
0a122b
+        /* When a pflash drive is not found, use rom-mode */
0a122b
+        old_pc_system_rom_init(rom_memory, isapc_ram_fw);
0a122b
+        return;
0a122b
+    }
0a122b
+
0a122b
+    if (kvm_enabled() && !kvm_readonly_mem_enabled()) {
0a122b
+        /* Older KVM cannot execute from device memory. So, flash memory
0a122b
+         * cannot be used unless the readonly memory kvm capability is present. */
0a122b
+        fprintf(stderr, "qemu: pflash with kvm requires KVM readonly memory support\n");
0a122b
+        exit(1);
0a122b
+    }
0a122b
+
0a122b
+    pc_system_flash_init(rom_memory, pflash_drv);
0a122b
+}
0a122b
diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
0a122b
index 5c69abe..413358f 100644
0a122b
--- a/include/hw/i386/pc.h
0a122b
+++ b/include/hw/i386/pc.h
0a122b
@@ -34,6 +34,7 @@ typedef struct PcPciInfo {
0a122b
 
0a122b
 struct PcGuestInfo {
0a122b
     bool has_pci_info;
0a122b
+    bool isapc_ram_fw;
0a122b
     hwaddr ram_size;
0a122b
     unsigned apic_id_limit;
0a122b
     bool apic_xrupt_override;
0a122b
@@ -228,7 +229,8 @@ static inline bool isa_ne2000_init(ISABus *bus, int base, int irq, NICInfo *nd)
0a122b
 }
0a122b
 
0a122b
 /* pc_sysfw.c */
0a122b
-void pc_system_firmware_init(MemoryRegion *rom_memory);
0a122b
+void pc_system_firmware_init(MemoryRegion *rom_memory,
0a122b
+                             bool isapc_ram_fw);
0a122b
 
0a122b
 /* pvpanic.c */
0a122b
 void pvpanic_init(ISABus *bus);
0a122b
-- 
0a122b
1.7.1
0a122b