From bc5ebe6df8479b32dbf46f75f32cfad7008a14f0 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= Date: Wed, 13 Dec 2017 13:38:32 +0100 Subject: [PATCH 01/41] fw_cfg: remove support for guest-side data writes MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit RH-Author: Marc-André Lureau Message-id: <20171213133912.26176-2-marcandre.lureau@redhat.com> Patchwork-id: 78353 O-Subject: [RHEL-7.5 qemu-kvm PATCH v3 01/41] fw_cfg: remove support for guest-side data writes Bugzilla: 1411490 RH-Acked-by: Laszlo Ersek RH-Acked-by: Michael S. Tsirkin RH-Acked-by: Miroslav Rezanina From: "Gabriel L. Somlo" >From this point forward, any guest-side writes to the fw_cfg data register will be treated as no-ops. This patch also removes the unused host-side API function fw_cfg_add_callback(), which allowed the registration of a callback to be executed each time the guest completed a full overwrite of a given fw_cfg data item. Signed-off-by: Gabriel Somlo Reviewed-by: Laszlo Ersek Signed-off-by: Gerd Hoffmann (cherry picked from commit 023e3148567ac898c7258138f8e86c3c2bb40d07) RHEL: Fix conflicts, due to fw_cfg_modify_bytes_read() introduction in upstream commit bdbb5b1706d165e8d4222121f1e9b59b6b4359ce. Signed-off-by: Marc-André Lureau Signed-off-by: Miroslav Rezanina --- hw/nvram/fw_cfg.c | 35 +---------------------------------- include/hw/nvram/fw_cfg.h | 2 -- trace-events | 1 - 3 files changed, 1 insertion(+), 37 deletions(-) diff --git a/hw/nvram/fw_cfg.c b/hw/nvram/fw_cfg.c index fcb3146..9d7b99e 100644 --- a/hw/nvram/fw_cfg.c +++ b/hw/nvram/fw_cfg.c @@ -40,7 +40,6 @@ typedef struct FWCfgEntry { uint32_t len; uint8_t *data; void *callback_opaque; - FWCfgCallback callback; FWCfgReadCallback read_callback; } FWCfgEntry; @@ -206,22 +205,7 @@ static void fw_cfg_reboot(FWCfgState *s) static void fw_cfg_write(FWCfgState *s, uint8_t value) { - int arch = !!(s->cur_entry & FW_CFG_ARCH_LOCAL); - FWCfgEntry *e = (s->cur_entry == FW_CFG_INVALID) ? NULL : - &s->entries[arch][s->cur_entry & FW_CFG_ENTRY_MASK]; - - trace_fw_cfg_write(s, value); - - if (s->cur_entry & FW_CFG_WRITE_CHANNEL - && e != NULL - && e->callback - && s->cur_offset < e->len) { - e->data[s->cur_offset++] = value; - if (s->cur_offset == e->len) { - e->callback(e->callback_opaque, e->data); - s->cur_offset = 0; - } - } + /* nothing, write support removed in QEMU v2.4+ */ } static int fw_cfg_select(FWCfgState *s, uint16_t key) @@ -442,23 +426,6 @@ void fw_cfg_add_i64(FWCfgState *s, uint16_t key, uint64_t value) fw_cfg_add_bytes(s, key, copy, sizeof(value)); } -void fw_cfg_add_callback(FWCfgState *s, uint16_t key, FWCfgCallback callback, - void *callback_opaque, void *data, size_t len) -{ - int arch = !!(key & FW_CFG_ARCH_LOCAL); - - assert(key & FW_CFG_WRITE_CHANNEL); - - key &= FW_CFG_ENTRY_MASK; - - assert(key < FW_CFG_MAX_ENTRY && len <= UINT32_MAX); - - s->entries[arch][key].data = data; - s->entries[arch][key].len = (uint32_t)len; - s->entries[arch][key].callback_opaque = callback_opaque; - s->entries[arch][key].callback = callback; -} - void fw_cfg_add_file_callback(FWCfgState *s, const char *filename, FWCfgReadCallback callback, void *callback_opaque, void *data, size_t len) diff --git a/include/hw/nvram/fw_cfg.h b/include/hw/nvram/fw_cfg.h index 72b1549..aa5f351 100644 --- a/include/hw/nvram/fw_cfg.h +++ b/include/hw/nvram/fw_cfg.h @@ -69,8 +69,6 @@ void fw_cfg_add_string(FWCfgState *s, uint16_t key, const char *value); void fw_cfg_add_i16(FWCfgState *s, uint16_t key, uint16_t value); void fw_cfg_add_i32(FWCfgState *s, uint16_t key, uint32_t value); void fw_cfg_add_i64(FWCfgState *s, uint16_t key, uint64_t value); -void fw_cfg_add_callback(FWCfgState *s, uint16_t key, FWCfgCallback callback, - void *callback_opaque, void *data, size_t len); 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, diff --git a/trace-events b/trace-events index fa2618d..a987dfa 100644 --- a/trace-events +++ b/trace-events @@ -176,7 +176,6 @@ ecc_diag_mem_writeb(uint64_t addr, uint32_t val) "Write diagnostic %"PRId64" = % ecc_diag_mem_readb(uint64_t addr, uint32_t ret) "Read diagnostic %"PRId64"= %02x" # hw/nvram/fw_cfg.c -fw_cfg_write(void *s, uint8_t value) "%p %d" fw_cfg_select(void *s, uint16_t key, int ret) "%p key %d = %d" fw_cfg_read(void *s, uint8_t ret) "%p = %d" fw_cfg_add_file_dupe(void *s, char *name) "%p %s" -- 1.8.3.1