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Date: Mon, 20 Aug 2012 15:47:32 +0200
From: Borislav Petkov <bp@...64.org>
To: Fenghua Yu <fenghua.yu@...el.com>
Cc: H Peter Anvin <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
Thomas Gleixner <tglx@...utronix.de>,
Asit K Mallick <asit.k.mallick@...el.com>,
Tigran Aivazian <tigran@...azian.fsnet.co.uk>,
Andreas Herrmann <andreas.herrmann3@....com>,
Borislav Petkov <borislav.petkov@....com>,
linux-kernel <linux-kernel@...r.kernel.org>, x86 <x86@...nel.org>
Subject: Re: [PATCH 03/11] x86/microcode_intel.h: Define functions and macros
for early load ucode
On Sat, Aug 18, 2012 at 01:15:21AM -0700, Fenghua Yu wrote:
> From: Fenghua Yu <fenghua.yu@...el.com>
>
> Define some functions and macros that will be used in early load ucode. Some of
> them are moved from microcode_intel.c driver in order to be called in early
> boot phase before module can be called.
>
> Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
> ---
> arch/x86/include/asm/microcode_intel.h | 103 ++++++++++++++++++
> arch/x86/kernel/Makefile | 3 +
> arch/x86/kernel/microcode_core.c | 7 +-
> arch/x86/kernel/microcode_intel.c | 185 ++------------------------------
> 4 files changed, 117 insertions(+), 181 deletions(-)
[ … ]
> -static int microcode_sanity_check(void *mc)
> -{
> - unsigned long total_size, data_size, ext_table_size;
> - struct microcode_header_intel *mc_header = mc;
> - struct extended_sigtable *ext_header = NULL;
> - int sum, orig_sum, ext_sigcount = 0, i;
> - struct extended_signature *ext_sig;
> -
> - total_size = get_totalsize(mc_header);
> - data_size = get_datasize(mc_header);
> -
> - if (data_size + MC_HEADER_SIZE > total_size) {
> - pr_err("error! Bad data size in microcode data file\n");
> - return -EINVAL;
> - }
> -
> - if (mc_header->ldrver != 1 || mc_header->hdrver != 1) {
> - pr_err("error! Unknown microcode update format\n");
> - return -EINVAL;
> - }
> - ext_table_size = total_size - (MC_HEADER_SIZE + data_size);
> - if (ext_table_size) {
> - if ((ext_table_size < EXT_HEADER_SIZE)
> - || ((ext_table_size - EXT_HEADER_SIZE) % EXT_SIGNATURE_SIZE)) {
> - pr_err("error! Small exttable size in microcode data file\n");
> - return -EINVAL;
> - }
> - ext_header = mc + MC_HEADER_SIZE + data_size;
> - if (ext_table_size != exttable_size(ext_header)) {
> - pr_err("error! Bad exttable size in microcode data file\n");
> - return -EFAULT;
> - }
> - ext_sigcount = ext_header->count;
> - }
> -
> - /* check extended table checksum */
> - if (ext_table_size) {
> - int ext_table_sum = 0;
> - int *ext_tablep = (int *)ext_header;
> -
> - i = ext_table_size / DWSIZE;
> - while (i--)
> - ext_table_sum += ext_tablep[i];
> - if (ext_table_sum) {
> - pr_warning("aborting, bad extended signature table checksum\n");
> - return -EINVAL;
> - }
> - }
> -
> - /* calculate the checksum */
> - orig_sum = 0;
> - i = (MC_HEADER_SIZE + data_size) / DWSIZE;
> - while (i--)
> - orig_sum += ((int *)mc)[i];
> - if (orig_sum) {
> - pr_err("aborting, bad checksum\n");
> - return -EINVAL;
> - }
> - if (!ext_table_size)
> - return 0;
> - /* check extended signature checksum */
> - for (i = 0; i < ext_sigcount; i++) {
> - ext_sig = (void *)ext_header + EXT_HEADER_SIZE +
> - EXT_SIGNATURE_SIZE * i;
> - sum = orig_sum
> - - (mc_header->sig + mc_header->pf + mc_header->cksum)
> - + (ext_sig->sig + ext_sig->pf + ext_sig->cksum);
> - if (sum) {
> - pr_err("aborting, bad checksum\n");
> - return -EINVAL;
> - }
> - }
> - return 0;
> -}
This patch introduces a build error:
In file included from arch/x86/kernel/microcode_intel.c:82:0:
/usr/src/linux/linux-2.6/arch/x86/include/asm/microcode_intel.h:81:14: warning: ‘struct mc_saved_data’ declared inside parameter list [enabled by default]
/usr/src/linux/linux-2.6/arch/x86/include/asm/microcode_intel.h:81:14: warning: its scope is only this definition or declaration, which is probably not what you want [enabled by default]
/usr/src/linux/linux-2.6/arch/x86/include/asm/microcode_intel.h:98:14: warning: ‘struct mc_saved_data’ declared inside parameter list [enabled by default]
ERROR: "get_matching_microcode" [arch/x86/kernel/microcode.ko] undefined!
ERROR: "microcode_sanity_check" [arch/x86/kernel/microcode.ko] undefined!
make[1]: *** [__modpost] Error 1
make: *** [modules] Error 2
make: *** Waiting for unfinished jobs....
due to the removal of the two functions.
> -
> -/*
> - * return 0 - no update found
> - * return 1 - found update
> - */
> -static int
> -get_matching_microcode(struct cpu_signature *cpu_sig, void *mc, int rev)
> -{
> - struct microcode_header_intel *mc_header = mc;
> - struct extended_sigtable *ext_header;
> - unsigned long total_size = get_totalsize(mc_header);
> - int ext_sigcount, i;
> - struct extended_signature *ext_sig;
> -
> - if (!update_match_revision(mc_header, rev))
> - return 0;
> -
> - if (update_match_cpu(cpu_sig, mc_header->sig, mc_header->pf))
> - return 1;
> -
> - /* Look for ext. headers: */
> - if (total_size <= get_datasize(mc_header) + MC_HEADER_SIZE)
> - return 0;
> -
> - ext_header = mc + get_datasize(mc_header) + MC_HEADER_SIZE;
> - ext_sigcount = ext_header->count;
> - ext_sig = (void *)ext_header + EXT_HEADER_SIZE;
> -
> - for (i = 0; i < ext_sigcount; i++) {
> - if (update_match_cpu(cpu_sig, ext_sig->sig, ext_sig->pf))
> - return 1;
> - ext_sig++;
> - }
> - return 0;
> -}
> -
> -static int apply_microcode(int cpu)
> +int apply_microcode(int cpu)
> {
> struct microcode_intel *mc_intel;
> struct ucode_cpu_info *uci;
> @@ -338,6 +164,7 @@ static enum ucode_state generic_load_microcode(int cpu, void *data, size_t size,
> unsigned int leftover = size;
> enum ucode_state state = UCODE_OK;
> unsigned int curr_mc_size = 0;
> + unsigned int csig, cpf;
>
> while (leftover) {
> struct microcode_header_intel mc_header;
> @@ -362,11 +189,13 @@ static enum ucode_state generic_load_microcode(int cpu, void *data, size_t size,
> }
>
> if (get_ucode_data(mc, ucode_ptr, mc_size) ||
> - microcode_sanity_check(mc) < 0) {
> + microcode_sanity_check(mc, 1) < 0) {
> break;
> }
>
> - if (get_matching_microcode(&uci->cpu_sig, mc, new_rev)) {
> + csig = uci->cpu_sig.sig;
> + cpf = uci->cpu_sig.pf;
> + if (get_matching_microcode(csig, cpf, mc, new_rev)) {
> vfree(new_mc);
> new_rev = mc_header.rev;
> new_mc = mc;
> --
> 1.7.2
>
>
--
Regards/Gruss,
Boris.
Advanced Micro Devices GmbH
Einsteinring 24, 85609 Dornach
GM: Alberto Bozzo
Reg: Dornach, Landkreis Muenchen
HRB Nr. 43632 WEEE Registernr: 129 19551
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