From 1cc1455511ff6ada7f4b3c4e23d8ff82f820f1ff Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= <marcandre.lureau@redhat.com>
Date: Wed, 13 Dec 2017 13:38:38 +0100
Subject: [PATCH 07/41] fw-cfg: support writeable blobs
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RH-Author: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-id: <20171213133912.26176-8-marcandre.lureau@redhat.com>
Patchwork-id: 78356
O-Subject: [RHEL-7.5 qemu-kvm PATCH v3 07/41] fw-cfg: support writeable blobs
Bugzilla: 1411490
RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
RH-Acked-by: Michael S. Tsirkin <mst@redhat.com>
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
From: "Michael S. Tsirkin" <mst@redhat.com>
Useful to send guest data back to QEMU.
Changes from Laszlo Ersek <lersek@redhat.com>:
- rebase the patch from Michael Tsirkin's original postings at [1] and [2]
to the following patches:
- loader: Allow a custom AddressSpace when loading ROMs
- loader: Add AddressSpace loading support to uImages
- loader: fix handling of custom address spaces when adding ROM blobs
- reject such writes immediately that would exceed the end of the array,
rather than performing a partial write before setting the error bit: see
the (len != dma.length) condition
- document the write interface
[1] http://lists.nongnu.org/archive/html/qemu-devel/2016-02/msg04968.html
[2] http://lists.nongnu.org/archive/html/qemu-devel/2016-03/msg02735.html
Cc: "Gabriel L. Somlo" <somlo@cmu.edu>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Igor Mammedov <imammedo@redhat.com>
Cc: Michael Walle <michael@walle.cc>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: Shannon Zhao <zhaoshenglong@huawei.com>
Cc: qemu-arm@nongnu.org
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Marcel Apfelbaum <marcel@redhat.com>
Acked-by: Gabriel Somlo <somlo@cmu.edu>
Tested-by: Gabriel Somlo <somlo@cmu.edu>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
(cherry picked from commit baf2d5bfbac015b27f4db74feab235e167df0c84)
RHEL: major conflict due to internal API changes, but functional
changes minor.
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
hw/core/loader.c | 19 ++++++++++++-------
hw/i386/acpi-build.c | 2 +-
hw/lm32/lm32_hwsetup.h | 3 ++-
hw/nvram/fw_cfg.c | 35 +++++++++++++++++++++++++++++------
include/hw/loader.h | 5 +++--
include/hw/nvram/fw_cfg.h | 2 +-
6 files changed, 48 insertions(+), 18 deletions(-)
diff --git a/hw/core/loader.c b/hw/core/loader.c
index 9309b8c..c824bc2 100644
--- a/hw/core/loader.c
+++ b/hw/core/loader.c
@@ -575,13 +575,13 @@ static void rom_insert(Rom *rom)
QTAILQ_INSERT_TAIL(&roms, rom, next);
}
-static void *rom_set_mr(Rom *rom, const char *name)
+static void *rom_set_mr(Rom *rom, const char *name, bool ro)
{
void *data;
rom->mr = g_malloc(sizeof(*rom->mr));
memory_region_init_ram(rom->mr, name, rom->datasize);
- memory_region_set_readonly(rom->mr, true);
+ memory_region_set_readonly(rom->mr, ro);
vmstate_register_ram_global(rom->mr);
data = memory_region_get_ram_ptr(rom->mr);
@@ -645,7 +645,7 @@ int rom_add_file(const char *file, const char *fw_dir,
snprintf(devpath, sizeof(devpath), "/rom@%s", fw_file_name);
if ((!option_rom || option_rom_has_mr) && rom_file_has_mr) {
- data = rom_set_mr(rom, devpath);
+ data = rom_set_mr(rom, devpath, true);
} else {
data = rom->data;
}
@@ -670,7 +670,8 @@ err:
void *rom_add_blob(const char *name, const void *blob, size_t len,
hwaddr addr, const char *fw_file_name,
- FWCfgReadCallback fw_callback, void *callback_opaque)
+ FWCfgReadCallback fw_callback, void *callback_opaque,
+ bool read_only)
{
Rom *rom;
void *data = NULL;
@@ -686,17 +687,21 @@ void *rom_add_blob(const char *name, const void *blob, size_t len,
if (fw_file_name && fw_cfg) {
char devpath[100];
- snprintf(devpath, sizeof(devpath), "/rom@%s", fw_file_name);
+ if (read_only) {
+ snprintf(devpath, sizeof(devpath), "/rom@%s", fw_file_name);
+ } else {
+ snprintf(devpath, sizeof(devpath), "/ram@%s", fw_file_name);
+ }
if (rom_file_has_mr) {
- data = rom_set_mr(rom, devpath);
+ data = rom_set_mr(rom, devpath, read_only);
} else {
data = rom->data;
}
fw_cfg_add_file_callback(fw_cfg, fw_file_name,
fw_callback, callback_opaque,
- data, rom->romsize);
+ data, rom->romsize, read_only);
}
return data;
}
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 85291f5..52dd500 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -1182,7 +1182,7 @@ static void *acpi_add_rom_blob(AcpiBuildState *build_state, GArray *blob,
const char *name)
{
return rom_add_blob(name, blob->data, acpi_data_len(blob), -1, name,
- acpi_build_update, build_state);
+ acpi_build_update, build_state, true);
}
static const VMStateDescription vmstate_acpi_build = {
diff --git a/hw/lm32/lm32_hwsetup.h b/hw/lm32/lm32_hwsetup.h
index 9fd5e69..92f952f 100644
--- a/hw/lm32/lm32_hwsetup.h
+++ b/hw/lm32/lm32_hwsetup.h
@@ -73,7 +73,8 @@ static inline void hwsetup_free(HWSetup *hw)
static inline void hwsetup_create_rom(HWSetup *hw,
hwaddr base)
{
- rom_add_blob("hwsetup", hw->data, TARGET_PAGE_SIZE, base, NULL, NULL, NULL);
+ rom_add_blob("hwsetup", hw->data, TARGET_PAGE_SIZE,
+ base, NULL, NULL, NULL, true);
}
static inline void hwsetup_add_u8(HWSetup *hw, uint8_t u)
diff --git a/hw/nvram/fw_cfg.c b/hw/nvram/fw_cfg.c
index 1317df7..1789487 100644
--- a/hw/nvram/fw_cfg.c
+++ b/hw/nvram/fw_cfg.c
@@ -46,9 +46,11 @@
#define FW_CFG_DMA_CTL_READ 0x02
#define FW_CFG_DMA_CTL_SKIP 0x04
#define FW_CFG_DMA_CTL_SELECT 0x08
+#define FW_CFG_DMA_CTL_WRITE 0x10
typedef struct FWCfgEntry {
uint32_t len;
+ bool allow_write;
uint8_t *data;
void *callback_opaque;
FWCfgReadCallback read_callback;
@@ -279,7 +281,7 @@ static void fw_cfg_dma_transfer(FWCfgState *s)
FWCfgDmaAccess dma;
int arch;
FWCfgEntry *e;
- int read;
+ int read = 0, write = 0;
dma_addr_t dma_addr;
/* Reset the address before the next access */
@@ -306,8 +308,13 @@ static void fw_cfg_dma_transfer(FWCfgState *s)
if (dma.control & FW_CFG_DMA_CTL_READ) {
read = 1;
+ write = 0;
+ } else if (dma.control & FW_CFG_DMA_CTL_WRITE) {
+ read = 0;
+ write = 1;
} else if (dma.control & FW_CFG_DMA_CTL_SKIP) {
read = 0;
+ write = 0;
} else {
dma.length = 0;
}
@@ -328,6 +335,9 @@ static void fw_cfg_dma_transfer(FWCfgState *s)
}
}
+ if (write) {
+ dma.control |= FW_CFG_DMA_CTL_ERROR;
+ }
} else {
if (dma.length <= (e->len - s->cur_offset)) {
len = dma.length;
@@ -349,6 +359,16 @@ static void fw_cfg_dma_transfer(FWCfgState *s)
}
}
+ if (write) {
+ if (!e->allow_write ||
+ len != dma.length ||
+ dma_memory_read(s->dma, dma.address,
+ &e->data[s->cur_offset], len)) {
+ dma.control |= FW_CFG_DMA_CTL_ERROR;
+ }
+ }
+
+
s->cur_offset += len;
}
@@ -539,7 +559,8 @@ static const VMStateDescription vmstate_fw_cfg = {
static void fw_cfg_add_bytes_read_callback(FWCfgState *s, uint16_t key,
FWCfgReadCallback callback,
void *callback_opaque,
- void *data, size_t len)
+ void *data, size_t len,
+ bool read_only)
{
int arch = !!(key & FW_CFG_ARCH_LOCAL);
@@ -552,11 +573,12 @@ static void fw_cfg_add_bytes_read_callback(FWCfgState *s, uint16_t key,
s->entries[arch][key].len = (uint32_t)len;
s->entries[arch][key].read_callback = callback;
s->entries[arch][key].callback_opaque = callback_opaque;
+ s->entries[arch][key].allow_write = !read_only;
}
void fw_cfg_add_bytes(FWCfgState *s, uint16_t key, void *data, size_t len)
{
- fw_cfg_add_bytes_read_callback(s, key, NULL, NULL, data, len);
+ fw_cfg_add_bytes_read_callback(s, key, NULL, NULL, data, len, true);
}
void fw_cfg_add_string(FWCfgState *s, uint16_t key, const char *value)
@@ -595,7 +617,7 @@ void fw_cfg_add_i64(FWCfgState *s, uint16_t key, uint64_t value)
void fw_cfg_add_file_callback(FWCfgState *s, const char *filename,
FWCfgReadCallback callback, void *callback_opaque,
- void *data, size_t len)
+ void *data, size_t len, bool read_only)
{
int i, index;
size_t dsize;
@@ -620,7 +642,8 @@ void fw_cfg_add_file_callback(FWCfgState *s, const char *filename,
}
fw_cfg_add_bytes_read_callback(s, FW_CFG_FILE_FIRST + index,
- callback, callback_opaque, data, len);
+ callback, callback_opaque, data, len,
+ read_only);
s->files->f[index].size = cpu_to_be32(len);
s->files->f[index].select = cpu_to_be16(FW_CFG_FILE_FIRST + index);
@@ -632,7 +655,7 @@ void fw_cfg_add_file_callback(FWCfgState *s, const char *filename,
void fw_cfg_add_file(FWCfgState *s, const char *filename,
void *data, size_t len)
{
- fw_cfg_add_file_callback(s, filename, NULL, NULL, data, len);
+ fw_cfg_add_file_callback(s, filename, NULL, NULL, data, len, true);
}
static void fw_cfg_machine_ready(struct Notifier *n, void *data)
diff --git a/include/hw/loader.h b/include/hw/loader.h
index a5e02ce..f04a834 100644
--- a/include/hw/loader.h
+++ b/include/hw/loader.h
@@ -31,7 +31,8 @@ int rom_add_file(const char *file, const char *fw_dir,
bool option_rom);
void *rom_add_blob(const char *name, const void *blob, size_t len,
hwaddr addr, const char *fw_file_name,
- FWCfgReadCallback fw_callback, void *callback_opaque);
+ FWCfgReadCallback fw_callback, void *callback_opaque,
+ bool read_only);
int rom_add_elf_program(const char *name, void *data, size_t datasize,
size_t romsize, hwaddr addr);
int rom_load_all(void);
@@ -44,7 +45,7 @@ void do_info_roms(Monitor *mon, const QDict *qdict);
#define rom_add_file_fixed(_f, _a, _i) \
rom_add_file(_f, NULL, _a, _i, false)
#define rom_add_blob_fixed(_f, _b, _l, _a) \
- (rom_add_blob(_f, _b, _l, _a, NULL, NULL, NULL) ? 0 : -1)
+ (rom_add_blob(_f, _b, _l, _a, NULL, NULL, NULL, true) ? 0 : -1)
#define PC_ROM_MIN_VGA 0xc0000
#define PC_ROM_MIN_OPTION 0xc8000
diff --git a/include/hw/nvram/fw_cfg.h b/include/hw/nvram/fw_cfg.h
index b193e38..76fc787 100644
--- a/include/hw/nvram/fw_cfg.h
+++ b/include/hw/nvram/fw_cfg.h
@@ -83,7 +83,7 @@ void fw_cfg_add_file(FWCfgState *s, const char *filename, void *data,
size_t len);
void fw_cfg_add_file_callback(FWCfgState *s, const char *filename,
FWCfgReadCallback callback, void *callback_opaque,
- void *data, size_t len);
+ void *data, size_t len, bool read_only);
FWCfgState *fw_cfg_init(uint32_t ctl_port, uint32_t data_port,
hwaddr crl_addr, hwaddr data_addr);
FWCfgState *fw_cfg_init_io_dma(uint32_t iobase, uint32_t dma_iobase,
--
1.8.3.1