* [Qemu-devel] [PATCH v7 0/2] Add optionrom compatible with fw_cfg DMA version
@ 2016-05-11 17:42 Richard W.M. Jones
2016-05-11 17:42 ` [Qemu-devel] [PATCH v7 1/2] scripts/signrom.py: Allow option ROM checksum script to write the size header Richard W.M. Jones
2016-05-11 17:42 ` [Qemu-devel] [PATCH v7 2/2] Add optionrom compatible with fw_cfg DMA version Richard W.M. Jones
0 siblings, 2 replies; 5+ messages in thread
From: Richard W.M. Jones @ 2016-05-11 17:42 UTC (permalink / raw)
To: qemu-devel
Cc: stefanha, marc.mari.barcelo, ehabkost, mst, kraxel, rth, lersek,
pbonzini
v6 -> v7:
- This version compiles and works with both GCC (tested 6.1.1) and with
Clang (tested 3.8.0).
- Uses -m16 mode on both compilers to generate i8086 code.
- The signrom.py script has been modified so it can (optionally)
generate the size field in the header.
- Tested with both a small (libguestfs) and large (Fedora 23) initrd.
Rich.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Qemu-devel] [PATCH v7 1/2] scripts/signrom.py: Allow option ROM checksum script to write the size header.
2016-05-11 17:42 [Qemu-devel] [PATCH v7 0/2] Add optionrom compatible with fw_cfg DMA version Richard W.M. Jones
@ 2016-05-11 17:42 ` Richard W.M. Jones
2016-05-11 17:42 ` [Qemu-devel] [PATCH v7 2/2] Add optionrom compatible with fw_cfg DMA version Richard W.M. Jones
1 sibling, 0 replies; 5+ messages in thread
From: Richard W.M. Jones @ 2016-05-11 17:42 UTC (permalink / raw)
To: qemu-devel
Cc: stefanha, marc.mari.barcelo, ehabkost, mst, kraxel, rth, lersek,
pbonzini
Modify the signrom.py script so that if the size byte in the header is
0 (ie. not set) then the script will set the size. If the size byte
is non-zero then we do the same as before, so this doesn't require
changes to any existing ROM sourcecode.
Signed-off-by: Richard W.M. Jones <rjones@redhat.com>
---
scripts/signrom.py | 25 ++++++++++++++++++++++---
1 file changed, 22 insertions(+), 3 deletions(-)
diff --git a/scripts/signrom.py b/scripts/signrom.py
index f9c35cc..6c8b9bf 100644
--- a/scripts/signrom.py
+++ b/scripts/signrom.py
@@ -18,10 +18,29 @@ fin = open(sys.argv[1], 'rb')
fout = open(sys.argv[2], 'wb')
fin.seek(2)
-size = ord(fin.read(1)) * 512 - 1
-
+size_byte = ord(fin.read(1))
fin.seek(0)
-data = fin.read(size)
+
+if size_byte == 0:
+ # If the caller left the size field blank then we will fill it in,
+ # also rounding the whole input to a multiple of 512 bytes.
+ data = fin.read()
+ # +1 because we need a byte to store the checksum.
+ size = len(data) + 1
+ # Round up to next multiple of 512.
+ size += 511
+ size -= size % 512
+ if size >= 65536:
+ sys.exit("%s: option ROM size too large" % sys.argv[1])
+ # size-1 because a final byte is added below to store the checksum.
+ data = data.ljust(size-1, '\0')
+ data = data[:2] + chr(size/512) + data[3:]
+else:
+ # Otherwise the input file specifies the size so use it.
+ # -1 because we overwrite the last byte of the file with the checksum.
+ size = size_byte * 512 - 1
+ data = fin.read(size)
+
fout.write(data)
checksum = 0
--
2.7.4
^ permalink raw reply related [flat|nested] 5+ messages in thread
* [Qemu-devel] [PATCH v7 2/2] Add optionrom compatible with fw_cfg DMA version
2016-05-11 17:42 [Qemu-devel] [PATCH v7 0/2] Add optionrom compatible with fw_cfg DMA version Richard W.M. Jones
2016-05-11 17:42 ` [Qemu-devel] [PATCH v7 1/2] scripts/signrom.py: Allow option ROM checksum script to write the size header Richard W.M. Jones
@ 2016-05-11 17:42 ` Richard W.M. Jones
2016-05-11 20:07 ` Paolo Bonzini
1 sibling, 1 reply; 5+ messages in thread
From: Richard W.M. Jones @ 2016-05-11 17:42 UTC (permalink / raw)
To: qemu-devel
Cc: stefanha, marc.mari.barcelo, ehabkost, mst, kraxel, rth, lersek,
pbonzini
From: Marc Marí <markmb@redhat.com>
This optionrom is based on linuxboot.S.
Signed-off-by: Marc Marí <markmb@redhat.com>
Signed-off-by: Richard W.M. Jones <rjones@redhat.com>
---
.gitignore | 4 +
hw/i386/pc.c | 10 +-
hw/nvram/fw_cfg.c | 2 +-
include/hw/nvram/fw_cfg.h | 1 +
pc-bios/optionrom/Makefile | 13 +-
pc-bios/optionrom/linuxboot_dma.c | 291 ++++++++++++++++++++++++++++++++++++++
6 files changed, 316 insertions(+), 5 deletions(-)
create mode 100644 pc-bios/optionrom/linuxboot_dma.c
diff --git a/.gitignore b/.gitignore
index 88a80ff..101d1e0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -94,6 +94,10 @@
/pc-bios/optionrom/linuxboot.bin
/pc-bios/optionrom/linuxboot.raw
/pc-bios/optionrom/linuxboot.img
+/pc-bios/optionrom/linuxboot_dma.asm
+/pc-bios/optionrom/linuxboot_dma.bin
+/pc-bios/optionrom/linuxboot_dma.raw
+/pc-bios/optionrom/linuxboot_dma.img
/pc-bios/optionrom/multiboot.asm
/pc-bios/optionrom/multiboot.bin
/pc-bios/optionrom/multiboot.raw
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 99437e0..098d571 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -999,8 +999,13 @@ static void load_linux(PCMachineState *pcms,
fw_cfg_add_i32(fw_cfg, FW_CFG_SETUP_SIZE, setup_size);
fw_cfg_add_bytes(fw_cfg, FW_CFG_SETUP_DATA, setup, setup_size);
- option_rom[nb_option_roms].name = "linuxboot.bin";
- option_rom[nb_option_roms].bootindex = 0;
+ if (fw_cfg_dma_enabled(fw_cfg)) {
+ option_rom[nb_option_roms].name = "linuxboot_dma.bin";
+ option_rom[nb_option_roms].bootindex = 0;
+ } else {
+ option_rom[nb_option_roms].name = "linuxboot.bin";
+ option_rom[nb_option_roms].bootindex = 0;
+ }
nb_option_roms++;
}
@@ -1263,6 +1268,7 @@ void xen_load_linux(PCMachineState *pcms)
load_linux(pcms, fw_cfg);
for (i = 0; i < nb_option_roms; i++) {
assert(!strcmp(option_rom[i].name, "linuxboot.bin") ||
+ !strcmp(option_rom[i].name, "linuxboot_dma.bin") ||
!strcmp(option_rom[i].name, "multiboot.bin"));
rom_add_option(option_rom[i].name, option_rom[i].bootindex);
}
diff --git a/hw/nvram/fw_cfg.c b/hw/nvram/fw_cfg.c
index 999f480..114aea8 100644
--- a/hw/nvram/fw_cfg.c
+++ b/hw/nvram/fw_cfg.c
@@ -551,7 +551,7 @@ static bool is_version_1(void *opaque, int version_id)
return version_id == 1;
}
-static bool fw_cfg_dma_enabled(void *opaque)
+bool fw_cfg_dma_enabled(void *opaque)
{
FWCfgState *s = opaque;
diff --git a/include/hw/nvram/fw_cfg.h b/include/hw/nvram/fw_cfg.h
index d008112..5c27a1f 100644
--- a/include/hw/nvram/fw_cfg.h
+++ b/include/hw/nvram/fw_cfg.h
@@ -182,5 +182,6 @@ FWCfgState *fw_cfg_init_mem_wide(hwaddr ctl_addr,
hwaddr dma_addr, AddressSpace *dma_as);
FWCfgState *fw_cfg_find(void);
+bool fw_cfg_dma_enabled(void *opaque);
#endif
diff --git a/pc-bios/optionrom/Makefile b/pc-bios/optionrom/Makefile
index ce4852a..a51dd6e 100644
--- a/pc-bios/optionrom/Makefile
+++ b/pc-bios/optionrom/Makefile
@@ -13,15 +13,24 @@ CFLAGS := -Wall -Wstrict-prototypes -Werror -fomit-frame-pointer -fno-builtin
CFLAGS += -I$(SRC_PATH)
CFLAGS += $(call cc-option, $(CFLAGS), -fno-stack-protector)
CFLAGS += $(CFLAGS_NOPIE)
+CFLAGS += -m16
QEMU_CFLAGS = $(CFLAGS)
-build-all: multiboot.bin linuxboot.bin kvmvapic.bin
+ASFLAGS += -32
+
+build-all: multiboot.bin linuxboot.bin linuxboot_dma.bin kvmvapic.bin
# suppress auto-removal of intermediate files
.SECONDARY:
+ifdef CONFIG_WIN32
+LD_EMULATION = i386pe
+else
+LD_EMULATION = elf_i386
+endif
+
%.img: %.o
- $(call quiet-command,$(LD) $(LDFLAGS_NOPIE) -Ttext 0 -e _start -s -o $@ $<," Building $(TARGET_DIR)$@")
+ $(call quiet-command,$(LD) $(LDFLAGS_NOPIE) -m $(LD_EMULATION) -Ttext 0 -e _start -s -o $@ $<," Building $(TARGET_DIR)$@")
%.raw: %.img
$(call quiet-command,$(OBJCOPY) -O binary -j .text $< $@," Building $(TARGET_DIR)$@")
diff --git a/pc-bios/optionrom/linuxboot_dma.c b/pc-bios/optionrom/linuxboot_dma.c
new file mode 100644
index 0000000..f0741a1
--- /dev/null
+++ b/pc-bios/optionrom/linuxboot_dma.c
@@ -0,0 +1,291 @@
+/*
+ * Linux Boot Option ROM for fw_cfg DMA
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * Copyright (c) 2015-2016 Red Hat Inc.
+ * Authors:
+ * Marc Marí <markmb@redhat.com>
+ * Richard W.M. Jones <rjones@redhat.com>
+ */
+
+asm(
+".text\n"
+".global _start\n"
+"_start:\n"
+" .short 0xaa55\n"
+" .byte 0\n" /* size in 512 units, filled in by signrom.py */
+" .byte 0xcb\n" /* far return without prefix */
+" .org 0x18\n"
+" .short 0\n"
+" .short _pnph\n"
+"_pnph:\n"
+" .ascii \"$PnP\"\n"
+" .byte 0x01\n"
+" .byte (_pnph_len / 16)\n"
+" .short 0x0000\n"
+" .byte 0x00\n"
+" .byte 0x00\n"
+" .long 0x00000000\n"
+" .short _manufacturer\n"
+" .short _product\n"
+" .long 0x00000000\n"
+" .short 0x0000\n"
+" .short 0x0000\n"
+" .short _bev\n"
+" .short 0x0000\n"
+" .short 0x0000\n"
+" .equ _pnph_len, . - _pnph\n"
+"_manufacturer:\n"
+" .asciz \"QEMU\"\n"
+"_product:\n"
+" .asciz \"Linux loader DMA\"\n"
+" .align 4, 0\n"
+"_bev:\n"
+" cli\n"
+" cld\n"
+" jmp load_kernel\n"
+);
+
+#include "../../include/hw/nvram/fw_cfg_keys.h"
+
+/* QEMU_CFG_DMA_CONTROL bits */
+#define BIOS_CFG_DMA_CTL_ERROR 0x01
+#define BIOS_CFG_DMA_CTL_READ 0x02
+#define BIOS_CFG_DMA_CTL_SKIP 0x04
+#define BIOS_CFG_DMA_CTL_SELECT 0x08
+
+#define BIOS_CFG_DMA_ADDR_HIGH 0x514
+#define BIOS_CFG_DMA_ADDR_LOW 0x518
+
+#define uint64_t unsigned long long
+#define uint32_t unsigned int
+#define uint16_t unsigned short
+
+#define barrier() asm("" : : : "memory")
+
+typedef struct FWCfgDmaAccess {
+ uint32_t control;
+ uint32_t length;
+ uint64_t address;
+} __attribute__((packed)) FWCfgDmaAccess;
+
+static inline void outl(uint32_t value, uint16_t port)
+{
+ asm("outl %0, %w1" : : "a"(value), "Nd"(port));
+}
+
+static inline void set_es(void *addr)
+{
+ uint32_t seg = (uint32_t)addr >> 4;
+ asm("movl %0, %%es" : : "r"(seg));
+}
+
+#ifdef __clang__
+#define ADDR32
+#else
+#define ADDR32 "addr32 "
+#endif
+
+static inline uint16_t readw_es(uint16_t offset)
+{
+ uint16_t val;
+ asm(ADDR32"movw %%es:(%1), %0" : "=r"(val) : "r"((uint32_t)offset));
+ barrier();
+ return val;
+}
+
+static inline uint32_t readl_es(uint16_t offset)
+{
+ uint32_t val;
+ asm(ADDR32"movl %%es:(%1), %0" : "=r"(val) : "r"((uint32_t)offset));
+ barrier();
+ return val;
+}
+
+static inline void writel_es(uint16_t offset, uint32_t val)
+{
+ barrier();
+ asm(ADDR32"movl %0, %%es:(%1)" : : "r"(val), "r"((uint32_t)offset));
+}
+
+static inline uint32_t bswap32(uint32_t x)
+{
+ return
+ ((x & 0x000000ffU) << 24) |
+ ((x & 0x0000ff00U) << 8) |
+ ((x & 0x00ff0000U) >> 8) |
+ ((x & 0xff000000U) >> 24);
+}
+
+static inline uint64_t bswap64(uint64_t x)
+{
+ return
+ ((x & 0x00000000000000ffULL) << 56) |
+ ((x & 0x000000000000ff00ULL) << 40) |
+ ((x & 0x0000000000ff0000ULL) << 24) |
+ ((x & 0x00000000ff000000ULL) << 8) |
+ ((x & 0x000000ff00000000ULL) >> 8) |
+ ((x & 0x0000ff0000000000ULL) >> 24) |
+ ((x & 0x00ff000000000000ULL) >> 40) |
+ ((x & 0xff00000000000000ULL) >> 56);
+}
+
+static inline uint64_t cpu_to_be64(uint64_t x)
+{
+ return bswap64(x);
+}
+
+static inline uint32_t cpu_to_be32(uint32_t x)
+{
+ return bswap32(x);
+}
+
+static inline uint32_t be32_to_cpu(uint32_t x)
+{
+ return bswap32(x);
+}
+
+static void bios_cfg_read_entry(void *buf, uint16_t entry, uint32_t len)
+{
+ FWCfgDmaAccess access;
+ uint32_t control = (entry << 16) | BIOS_CFG_DMA_CTL_SELECT
+ | BIOS_CFG_DMA_CTL_READ;
+
+ access.address = cpu_to_be64((uint64_t)(uint32_t)buf);
+ access.length = cpu_to_be32(len);
+ access.control = cpu_to_be32(control);
+
+ barrier();
+
+ outl(cpu_to_be32((uint32_t)&access), BIOS_CFG_DMA_ADDR_LOW);
+
+ while (be32_to_cpu(access.control) & ~BIOS_CFG_DMA_CTL_ERROR) {
+ barrier();
+ }
+}
+
+/* Return top of memory using BIOS function E801. */
+static uint32_t get_e801_addr(void)
+{
+ uint16_t ax, bx, cx, dx;
+ uint32_t ret;
+
+ asm("int $0x15\n"
+ : "=a"(ax), "=b"(bx), "=c"(cx), "=d"(dx)
+ : "a"(0xe801), "b"(0), "c"(0), "d"(0));
+
+ /* Not SeaBIOS, but in theory a BIOS could return CX=DX=0 in which
+ * case we need to use the result from AX & BX instead.
+ */
+ if (cx == 0 && dx == 0) {
+ cx = ax;
+ dx = bx;
+ }
+
+ if (dx) {
+ /* DX = extended memory above 16M, in 64K units.
+ * Convert it to bytes and return.
+ */
+ ret = ((uint32_t)dx + 256 /* 16M in 64K units */) << 16;
+ } else {
+ /* This is a fallback path for machines with <= 16MB of RAM,
+ * which probably would never be the case, but deal with it
+ * anyway.
+ *
+ * CX = extended memory between 1M and 16M, in kilobytes
+ * Convert it to bytes and return.
+ */
+ ret = ((uint32_t)cx + 1024 /* 1M in K */) << 10;
+ }
+
+ return ret;
+}
+
+void load_kernel(void)
+{
+ void *setup_addr;
+ void *initrd_addr;
+ void *kernel_addr;
+ void *cmdline_addr;
+ uint32_t setup_size;
+ uint32_t initrd_size;
+ uint32_t kernel_size;
+ uint32_t cmdline_size;
+ uint32_t initrd_end_page, max_allowed_page;
+ uint32_t segment_addr, stack_addr;
+
+ bios_cfg_read_entry(&setup_addr, FW_CFG_SETUP_ADDR, 4);
+ bios_cfg_read_entry(&setup_size, FW_CFG_SETUP_SIZE, 4);
+ bios_cfg_read_entry(setup_addr, FW_CFG_SETUP_DATA, setup_size);
+
+ set_es(setup_addr);
+
+ /* For protocol < 0x203 we don't have initrd_max ... */
+ if (readw_es(0x206) < 0x203) {
+ /* ... so we assume initrd_max = 0x37ffffff. */
+ writel_es(0x22c, 0x37ffffff);
+ }
+
+ bios_cfg_read_entry(&initrd_addr, FW_CFG_INITRD_ADDR, 4);
+ bios_cfg_read_entry(&initrd_size, FW_CFG_INITRD_SIZE, 4);
+
+ initrd_end_page = ((uint32_t)(initrd_addr + initrd_size) & -4096);
+ max_allowed_page = (readl_es(0x22c) & -4096);
+
+ if (initrd_end_page != 0 && max_allowed_page != 0 &&
+ initrd_end_page != max_allowed_page) {
+ /* Initrd at the end of memory. Compute better initrd address
+ * based on e801 data
+ */
+ initrd_addr = (void *)((get_e801_addr() - initrd_size) & -4096);
+ writel_es(0x218, (uint32_t)initrd_addr);
+
+ }
+
+ bios_cfg_read_entry(initrd_addr, FW_CFG_INITRD_DATA, initrd_size);
+
+ bios_cfg_read_entry(&kernel_addr, FW_CFG_KERNEL_ADDR, 4);
+ bios_cfg_read_entry(&kernel_size, FW_CFG_KERNEL_SIZE, 4);
+ bios_cfg_read_entry(kernel_addr, FW_CFG_KERNEL_DATA, kernel_size);
+
+ bios_cfg_read_entry(&cmdline_addr, FW_CFG_CMDLINE_ADDR, 4);
+ bios_cfg_read_entry(&cmdline_size, FW_CFG_CMDLINE_SIZE, 4);
+ bios_cfg_read_entry(cmdline_addr, FW_CFG_CMDLINE_DATA, cmdline_size);
+
+ /* Boot linux */
+ segment_addr = ((uint32_t)setup_addr >> 4);
+ stack_addr = (uint32_t)(cmdline_addr - setup_addr - 16);
+
+ /* As we are changing critical registers, we cannot leave freedom to the
+ * compiler.
+ */
+ asm("movw %%ax, %%ds\n"
+ "movw %%ax, %%es\n"
+ "movw %%ax, %%fs\n"
+ "movw %%ax, %%gs\n"
+ "movw %%ax, %%ss\n"
+ "movl %%ebx, %%esp\n"
+ "addw $0x20, %%ax\n"
+ "pushw %%ax\n" /* CS */
+ "pushw $0\n" /* IP */
+ /* Clear registers and jump to Linux */
+ "xor %%ebx, %%ebx\n"
+ "xor %%ecx, %%ecx\n"
+ "xor %%edx, %%edx\n"
+ "xor %%edi, %%edi\n"
+ "xor %%ebp, %%ebp\n"
+ "lretw\n"
+ : : "a"(segment_addr), "b"(stack_addr));
+}
--
2.7.4
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [Qemu-devel] [PATCH v7 2/2] Add optionrom compatible with fw_cfg DMA version
2016-05-11 17:42 ` [Qemu-devel] [PATCH v7 2/2] Add optionrom compatible with fw_cfg DMA version Richard W.M. Jones
@ 2016-05-11 20:07 ` Paolo Bonzini
2016-05-11 21:04 ` Richard W.M. Jones
0 siblings, 1 reply; 5+ messages in thread
From: Paolo Bonzini @ 2016-05-11 20:07 UTC (permalink / raw)
To: Richard W.M. Jones, qemu-devel
Cc: stefanha, marc.mari.barcelo, ehabkost, mst, kraxel, rth, lersek
On 11/05/2016 19:42, Richard W.M. Jones wrote:
> +
> +#ifdef __clang__
> +#define ADDR32
> +#else
> +#define ADDR32 "addr32 "
> +#endif
> +
> +static inline uint16_t readw_es(uint16_t offset)
> +{
> + uint16_t val;
> + asm(ADDR32"movw %%es:(%1), %0" : "=r"(val) : "r"((uint32_t)offset));
> + barrier();
> + return val;
> +}
Please check that the output is the same byte-by-byte for this asm.
I guess this is okay if we have a guarantee from clang that the asm
block stays at the beginning. Perhaps check for the 0x55 0xaa signature
in signrom.py?
Thanks,
Paolo
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [Qemu-devel] [PATCH v7 2/2] Add optionrom compatible with fw_cfg DMA version
2016-05-11 20:07 ` Paolo Bonzini
@ 2016-05-11 21:04 ` Richard W.M. Jones
0 siblings, 0 replies; 5+ messages in thread
From: Richard W.M. Jones @ 2016-05-11 21:04 UTC (permalink / raw)
To: Paolo Bonzini
Cc: qemu-devel, stefanha, marc.mari.barcelo, ehabkost, mst, kraxel,
rth, lersek
On Wed, May 11, 2016 at 10:07:27PM +0200, Paolo Bonzini wrote:
>
>
> On 11/05/2016 19:42, Richard W.M. Jones wrote:
> > +
> > +#ifdef __clang__
> > +#define ADDR32
> > +#else
> > +#define ADDR32 "addr32 "
> > +#endif
> > +
> > +static inline uint16_t readw_es(uint16_t offset)
> > +{
> > + uint16_t val;
> > + asm(ADDR32"movw %%es:(%1), %0" : "=r"(val) : "r"((uint32_t)offset));
> > + barrier();
> > + return val;
> > +}
>
> Please check that the output is the same byte-by-byte for this asm.
For this function, clang emits:
647: 26 67 8b 08 mov %es:(%eax),%cx
GCC emits:
b3: 26 67 8b 00 mov %es:(%eax),%ax
So yes these are byte for byte identical (except for the MOD R/M byte
because of the different target register).
> I guess this is okay if we have a guarantee from clang that the asm
> block stays at the beginning. Perhaps check for the 0x55 0xaa signature
> in signrom.py?
Good idea, I'll add this in the next version.
Thanks,
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-top is 'top' for virtual machines. Tiny program with many
powerful monitoring features, net stats, disk stats, logging, etc.
http://people.redhat.com/~rjones/virt-top
^ permalink raw reply [flat|nested] 5+ messages in thread
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-- links below jump to the message on this page --
2016-05-11 17:42 [Qemu-devel] [PATCH v7 0/2] Add optionrom compatible with fw_cfg DMA version Richard W.M. Jones
2016-05-11 17:42 ` [Qemu-devel] [PATCH v7 1/2] scripts/signrom.py: Allow option ROM checksum script to write the size header Richard W.M. Jones
2016-05-11 17:42 ` [Qemu-devel] [PATCH v7 2/2] Add optionrom compatible with fw_cfg DMA version Richard W.M. Jones
2016-05-11 20:07 ` Paolo Bonzini
2016-05-11 21:04 ` Richard W.M. Jones
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