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Re: [Qemu-devel] [PATCH v2 2/5] fw_cfg: remove support for guest-side da
From: |
Laszlo Ersek |
Subject: |
Re: [Qemu-devel] [PATCH v2 2/5] fw_cfg: remove support for guest-side data writes |
Date: |
Thu, 19 Mar 2015 17:16:24 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0 |
On 03/19/15 01:18, Gabriel L. Somlo wrote:
> 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 <address@hidden>
> ---
> hw/nvram/fw_cfg.c | 33 +--------------------------------
> include/hw/nvram/fw_cfg.h | 2 --
> trace-events | 1 -
> 3 files changed, 1 insertion(+), 35 deletions(-)
>
> diff --git a/hw/nvram/fw_cfg.c b/hw/nvram/fw_cfg.c
> index 78a37be..2f609b4 100644
> --- a/hw/nvram/fw_cfg.c
> +++ b/hw/nvram/fw_cfg.c
> @@ -46,7 +46,6 @@ typedef struct FWCfgEntry {
> uint32_t len;
> uint8_t *data;
> void *callback_opaque;
> - FWCfgCallback callback;
> FWCfgReadCallback read_callback;
> } FWCfgEntry;
>
> @@ -232,19 +231,7 @@ 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->entries[arch][s->cur_entry & FW_CFG_ENTRY_MASK];
> -
> - trace_fw_cfg_write(s, value);
> -
> - if (s->cur_entry & FW_CFG_WRITE_CHANNEL && 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)
> @@ -458,7 +445,6 @@ static void *fw_cfg_modify_bytes_read(FWCfgState *s,
> uint16_t key,
> s->entries[arch][key].data = data;
> s->entries[arch][key].len = len;
> s->entries[arch][key].callback_opaque = NULL;
> - s->entries[arch][key].callback = NULL;
>
> return ptr;
> }
> @@ -502,23 +488,6 @@ 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 6d8a8ac..b2e10c2 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 30eba92..1275b70 100644
> --- a/trace-events
> +++ b/trace-events
> @@ -193,7 +193,6 @@ 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"
>
Reviewed-by: Laszlo Ersek <address@hidden>