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From 1cc1455511ff6ada7f4b3c4e23d8ff82f820f1ff Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= <marcandre.lureau@redhat.com>
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Date: Wed, 13 Dec 2017 13:38:38 +0100
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Subject: [PATCH 07/41] fw-cfg: support writeable blobs
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Marc-André Lureau <marcandre.lureau@redhat.com>
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Message-id: <20171213133912.26176-8-marcandre.lureau@redhat.com>
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Patchwork-id: 78356
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O-Subject: [RHEL-7.5 qemu-kvm PATCH v3 07/41] fw-cfg: support writeable blobs
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Bugzilla: 1411490
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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RH-Acked-by: Michael S. Tsirkin <mst@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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From: "Michael S. Tsirkin" <mst@redhat.com>
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Useful to send guest data back to QEMU.
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Changes from Laszlo Ersek <lersek@redhat.com>:
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- rebase the patch from Michael Tsirkin's original postings at [1] and [2]
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  to the following patches:
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  - loader: Allow a custom AddressSpace when loading ROMs
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  - loader: Add AddressSpace loading support to uImages
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  - loader: fix handling of custom address spaces when adding ROM blobs
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- reject such writes immediately that would exceed the end of the array,
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  rather than performing a partial write before setting the error bit: see
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  the (len != dma.length) condition
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- document the write interface
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[1] http://lists.nongnu.org/archive/html/qemu-devel/2016-02/msg04968.html
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[2] http://lists.nongnu.org/archive/html/qemu-devel/2016-03/msg02735.html
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Cc: "Gabriel L. Somlo" <somlo@cmu.edu>
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Cc: "Michael S. Tsirkin" <mst@redhat.com>
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Cc: Gerd Hoffmann <kraxel@redhat.com>
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Cc: Igor Mammedov <imammedo@redhat.com>
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Cc: Michael Walle <michael@walle.cc>
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Cc: Paolo Bonzini <pbonzini@redhat.com>
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Cc: Peter Maydell <peter.maydell@linaro.org>
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Cc: Shannon Zhao <zhaoshenglong@huawei.com>
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Cc: qemu-arm@nongnu.org
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Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Signed-off-by: Laszlo Ersek <lersek@redhat.com>
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Reviewed-by: Marcel Apfelbaum <marcel@redhat.com>
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Acked-by: Gabriel Somlo <somlo@cmu.edu>
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Tested-by: Gabriel Somlo <somlo@cmu.edu>
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Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
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Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
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(cherry picked from commit baf2d5bfbac015b27f4db74feab235e167df0c84)
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RHEL: major conflict due to internal API changes, but functional
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      changes minor.
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Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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 hw/core/loader.c          | 19 ++++++++++++-------
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 hw/i386/acpi-build.c      |  2 +-
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 hw/lm32/lm32_hwsetup.h    |  3 ++-
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 hw/nvram/fw_cfg.c         | 35 +++++++++++++++++++++++++++++------
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 include/hw/loader.h       |  5 +++--
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 include/hw/nvram/fw_cfg.h |  2 +-
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 6 files changed, 48 insertions(+), 18 deletions(-)
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diff --git a/hw/core/loader.c b/hw/core/loader.c
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index 9309b8c..c824bc2 100644
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--- a/hw/core/loader.c
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+++ b/hw/core/loader.c
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@@ -575,13 +575,13 @@ static void rom_insert(Rom *rom)
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     QTAILQ_INSERT_TAIL(&roms, rom, next);
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 }
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-static void *rom_set_mr(Rom *rom, const char *name)
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+static void *rom_set_mr(Rom *rom, const char *name, bool ro)
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 {
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     void *data;
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     rom->mr = g_malloc(sizeof(*rom->mr));
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     memory_region_init_ram(rom->mr, name, rom->datasize);
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-    memory_region_set_readonly(rom->mr, true);
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+    memory_region_set_readonly(rom->mr, ro);
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     vmstate_register_ram_global(rom->mr);
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     data = memory_region_get_ram_ptr(rom->mr);
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@@ -645,7 +645,7 @@ int rom_add_file(const char *file, const char *fw_dir,
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         snprintf(devpath, sizeof(devpath), "/rom@%s", fw_file_name);
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         if ((!option_rom || option_rom_has_mr) && rom_file_has_mr) {
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-            data = rom_set_mr(rom, devpath);
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+            data = rom_set_mr(rom, devpath, true);
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         } else {
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             data = rom->data;
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         }
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@@ -670,7 +670,8 @@ err:
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 void *rom_add_blob(const char *name, const void *blob, size_t len,
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                    hwaddr addr, const char *fw_file_name,
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-                   FWCfgReadCallback fw_callback, void *callback_opaque)
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+                   FWCfgReadCallback fw_callback, void *callback_opaque,
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+                   bool read_only)
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 {
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     Rom *rom;
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     void *data = NULL;
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@@ -686,17 +687,21 @@ void *rom_add_blob(const char *name, const void *blob, size_t len,
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     if (fw_file_name && fw_cfg) {
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         char devpath[100];
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-        snprintf(devpath, sizeof(devpath), "/rom@%s", fw_file_name);
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+        if (read_only) {
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+            snprintf(devpath, sizeof(devpath), "/rom@%s", fw_file_name);
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+        } else {
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+            snprintf(devpath, sizeof(devpath), "/ram@%s", fw_file_name);
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+        }
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         if (rom_file_has_mr) {
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-            data = rom_set_mr(rom, devpath);
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+            data = rom_set_mr(rom, devpath, read_only);
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         } else {
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             data = rom->data;
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         }
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         fw_cfg_add_file_callback(fw_cfg, fw_file_name,
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                                  fw_callback, callback_opaque,
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-                                 data, rom->romsize);
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+                                 data, rom->romsize, read_only);
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     }
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     return data;
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 }
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diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
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index 85291f5..52dd500 100644
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--- a/hw/i386/acpi-build.c
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+++ b/hw/i386/acpi-build.c
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@@ -1182,7 +1182,7 @@ static void *acpi_add_rom_blob(AcpiBuildState *build_state, GArray *blob,
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                                const char *name)
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 {
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     return rom_add_blob(name, blob->data, acpi_data_len(blob), -1, name,
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-                        acpi_build_update, build_state);
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+                        acpi_build_update, build_state, true);
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 }
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 static const VMStateDescription vmstate_acpi_build = {
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diff --git a/hw/lm32/lm32_hwsetup.h b/hw/lm32/lm32_hwsetup.h
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index 9fd5e69..92f952f 100644
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--- a/hw/lm32/lm32_hwsetup.h
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+++ b/hw/lm32/lm32_hwsetup.h
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@@ -73,7 +73,8 @@ static inline void hwsetup_free(HWSetup *hw)
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 static inline void hwsetup_create_rom(HWSetup *hw,
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         hwaddr base)
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 {
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-    rom_add_blob("hwsetup", hw->data, TARGET_PAGE_SIZE, base, NULL, NULL, NULL);
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+    rom_add_blob("hwsetup", hw->data, TARGET_PAGE_SIZE,
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+                 base, NULL, NULL, NULL, true);
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 }
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 static inline void hwsetup_add_u8(HWSetup *hw, uint8_t u)
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diff --git a/hw/nvram/fw_cfg.c b/hw/nvram/fw_cfg.c
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index 1317df7..1789487 100644
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--- a/hw/nvram/fw_cfg.c
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+++ b/hw/nvram/fw_cfg.c
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@@ -46,9 +46,11 @@
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 #define FW_CFG_DMA_CTL_READ    0x02
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 #define FW_CFG_DMA_CTL_SKIP    0x04
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 #define FW_CFG_DMA_CTL_SELECT  0x08
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+#define FW_CFG_DMA_CTL_WRITE   0x10
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 typedef struct FWCfgEntry {
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     uint32_t len;
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+    bool allow_write;
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     uint8_t *data;
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     void *callback_opaque;
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     FWCfgReadCallback read_callback;
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@@ -279,7 +281,7 @@ static void fw_cfg_dma_transfer(FWCfgState *s)
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     FWCfgDmaAccess dma;
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     int arch;
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     FWCfgEntry *e;
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-    int read;
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+    int read = 0, write = 0;
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     dma_addr_t dma_addr;
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     /* Reset the address before the next access */
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@@ -306,8 +308,13 @@ static void fw_cfg_dma_transfer(FWCfgState *s)
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     if (dma.control & FW_CFG_DMA_CTL_READ) {
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         read = 1;
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+        write = 0;
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+    } else if (dma.control & FW_CFG_DMA_CTL_WRITE) {
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+        read = 0;
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+        write = 1;
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     } else if (dma.control & FW_CFG_DMA_CTL_SKIP) {
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         read = 0;
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+        write = 0;
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     } else {
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         dma.length = 0;
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     }
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@@ -328,6 +335,9 @@ static void fw_cfg_dma_transfer(FWCfgState *s)
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                 }
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             }
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+            if (write) {
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+                dma.control |= FW_CFG_DMA_CTL_ERROR;
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+            }
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         } else {
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             if (dma.length <= (e->len - s->cur_offset)) {
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                 len = dma.length;
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@@ -349,6 +359,16 @@ static void fw_cfg_dma_transfer(FWCfgState *s)
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                 }
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             }
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+            if (write) {
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+                if (!e->allow_write ||
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+                    len != dma.length ||
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+                    dma_memory_read(s->dma, dma.address,
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+                                    &e->data[s->cur_offset], len)) {
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+                    dma.control |= FW_CFG_DMA_CTL_ERROR;
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+                }
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+            }
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+
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+
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             s->cur_offset += len;
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         }
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@@ -539,7 +559,8 @@ static const VMStateDescription vmstate_fw_cfg = {
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 static void fw_cfg_add_bytes_read_callback(FWCfgState *s, uint16_t key,
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                                            FWCfgReadCallback callback,
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                                            void *callback_opaque,
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-                                           void *data, size_t len)
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+                                           void *data, size_t len,
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+                                           bool read_only)
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 {
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     int arch = !!(key & FW_CFG_ARCH_LOCAL);
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@@ -552,11 +573,12 @@ static void fw_cfg_add_bytes_read_callback(FWCfgState *s, uint16_t key,
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     s->entries[arch][key].len = (uint32_t)len;
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     s->entries[arch][key].read_callback = callback;
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     s->entries[arch][key].callback_opaque = callback_opaque;
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+    s->entries[arch][key].allow_write = !read_only;
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 }
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 void fw_cfg_add_bytes(FWCfgState *s, uint16_t key, void *data, size_t len)
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 {
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-    fw_cfg_add_bytes_read_callback(s, key, NULL, NULL, data, len);
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+    fw_cfg_add_bytes_read_callback(s, key, NULL, NULL, data, len, true);
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 }
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 void fw_cfg_add_string(FWCfgState *s, uint16_t key, const char *value)
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@@ -595,7 +617,7 @@ void fw_cfg_add_i64(FWCfgState *s, uint16_t key, uint64_t value)
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 void fw_cfg_add_file_callback(FWCfgState *s,  const char *filename,
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                               FWCfgReadCallback callback, void *callback_opaque,
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-                              void *data, size_t len)
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+                              void *data, size_t len, bool read_only)
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 {
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     int i, index;
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     size_t dsize;
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@@ -620,7 +642,8 @@ void fw_cfg_add_file_callback(FWCfgState *s,  const char *filename,
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     }
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     fw_cfg_add_bytes_read_callback(s, FW_CFG_FILE_FIRST + index,
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-                                   callback, callback_opaque, data, len);
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+                                   callback, callback_opaque, data, len,
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+                                   read_only);
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     s->files->f[index].size   = cpu_to_be32(len);
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     s->files->f[index].select = cpu_to_be16(FW_CFG_FILE_FIRST + index);
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@@ -632,7 +655,7 @@ void fw_cfg_add_file_callback(FWCfgState *s,  const char *filename,
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 void fw_cfg_add_file(FWCfgState *s,  const char *filename,
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                      void *data, size_t len)
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 {
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-    fw_cfg_add_file_callback(s, filename, NULL, NULL, data, len);
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+    fw_cfg_add_file_callback(s, filename, NULL, NULL, data, len, true);
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 }
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 static void fw_cfg_machine_ready(struct Notifier *n, void *data)
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diff --git a/include/hw/loader.h b/include/hw/loader.h
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index a5e02ce..f04a834 100644
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--- a/include/hw/loader.h
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+++ b/include/hw/loader.h
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@@ -31,7 +31,8 @@ int rom_add_file(const char *file, const char *fw_dir,
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                  bool option_rom);
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 void *rom_add_blob(const char *name, const void *blob, size_t len,
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                    hwaddr addr, const char *fw_file_name,
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-                   FWCfgReadCallback fw_callback, void *callback_opaque);
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+                   FWCfgReadCallback fw_callback, void *callback_opaque,
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+                   bool read_only);
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 int rom_add_elf_program(const char *name, void *data, size_t datasize,
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                         size_t romsize, hwaddr addr);
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 int rom_load_all(void);
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@@ -44,7 +45,7 @@ void do_info_roms(Monitor *mon, const QDict *qdict);
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 #define rom_add_file_fixed(_f, _a, _i)          \
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     rom_add_file(_f, NULL, _a, _i, false)
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 #define rom_add_blob_fixed(_f, _b, _l, _a)      \
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-    (rom_add_blob(_f, _b, _l, _a, NULL, NULL, NULL) ? 0 : -1)
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+    (rom_add_blob(_f, _b, _l, _a, NULL, NULL, NULL, true) ? 0 : -1)
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 #define PC_ROM_MIN_VGA     0xc0000
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 #define PC_ROM_MIN_OPTION  0xc8000
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diff --git a/include/hw/nvram/fw_cfg.h b/include/hw/nvram/fw_cfg.h
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index b193e38..76fc787 100644
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--- a/include/hw/nvram/fw_cfg.h
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+++ b/include/hw/nvram/fw_cfg.h
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@@ -83,7 +83,7 @@ void fw_cfg_add_file(FWCfgState *s, const char *filename, void *data,
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                      size_t len);
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 void fw_cfg_add_file_callback(FWCfgState *s, const char *filename,
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                               FWCfgReadCallback callback, void *callback_opaque,
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-                              void *data, size_t len);
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+                              void *data, size_t len, bool read_only);
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 FWCfgState *fw_cfg_init(uint32_t ctl_port, uint32_t data_port,
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                         hwaddr crl_addr, hwaddr data_addr);
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 FWCfgState *fw_cfg_init_io_dma(uint32_t iobase, uint32_t dma_iobase,
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-- 
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1.8.3.1
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