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x86/cpufeature: Add bug flags to /proc/cpuinfo 

Dump the flags which denote we have detected and/or have applied bug
workarounds to the CPU we're executing on, in a similar manner to the
feature flags.

The advantage is that those are not accumulating over time like the CPU
features.

Signed-off-by: Borislav Petkov <bp@suse.de>
Link: http://lkml.kernel.org/r/1403609105-8332-2-git-send-email-bp@alien8.de
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Borislav Petkov 2014-06-24 13:25:03 +02:00 committed by H. Peter Anvin
parent 9b13a93df2
commit 80a208bd39
3 changed files with 53 additions and 16 deletions
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10
arch/x86/include/asm/cpufeature.h
View File

@ -239,8 +239,8 @@
#define X86_BUG_F00F X86_BUG(0) /* Intel F00F */
#define X86_BUG_FDIV X86_BUG(1) /* FPU FDIV */
#define X86_BUG_COMA X86_BUG(2) /* Cyrix 6x86 coma */
#define X86_BUG_AMD_TLB_MMATCH X86_BUG(3) /* AMD Erratum 383 */
#define X86_BUG_AMD_APIC_C1E X86_BUG(4) /* AMD Erratum 400 */
#define X86_BUG_AMD_TLB_MMATCH X86_BUG(3) /* "tlb_mmatch" AMD Erratum 383 */
#define X86_BUG_AMD_APIC_C1E X86_BUG(4) /* "apic_c1e" AMD Erratum 400 */
#define X86_BUG_11AP X86_BUG(5) /* Bad local APIC aka 11AP */
#define X86_BUG_FXSAVE_LEAK X86_BUG(6) /* FXSAVE leaks FOP/FIP/FOP */
#define X86_BUG_CLFLUSH_MONITOR X86_BUG(7) /* AAI65, CLFLUSH required before MONITOR */
@ -253,6 +253,12 @@
extern const char * const x86_cap_flags[NCAPINTS*32];
extern const char * const x86_power_flags[32];
/*
* In order to save room, we index into this array by doing
* X86_BUG_<name> - NCAPINTS*32.
*/
extern const char * const x86_bug_flags[NBUGINTS*32];
#define test_cpu_cap(c, bit) \
test_bit(bit, (unsigned long *)((c)->x86_capability))

51
arch/x86/kernel/cpu/mkcapflags.sh
View File

@ -1,23 +1,25 @@
#!/bin/sh
#
# Generate the x86_cap_flags[] array from include/asm/cpufeature.h
# Generate the x86_cap/bug_flags[] arrays from include/asm/cpufeature.h
#
IN=$1
OUT=$2
TABS="$(printf '\t\t\t\t\t')"
trap 'rm "$OUT"' EXIT
function dump_array()
{
ARRAY=$1
SIZE=$2
PFX=$3
POSTFIX=$4
(
echo "#ifndef _ASM_X86_CPUFEATURE_H"
echo "#include <asm/cpufeature.h>"
echo "#endif"
echo ""
echo "const char * const x86_cap_flags[NCAPINTS*32] = {"
PFX_SZ=$(echo $PFX | wc -c)
TABS="$(printf '\t\t\t\t\t')"
# Iterate through any input lines starting with #define X86_FEATURE_
sed -n -e 's/\t/ /g' -e 's/^ *# *define *X86_FEATURE_//p' $IN |
echo "const char * const $ARRAY[$SIZE] = {"
# Iterate through any input lines starting with #define $PFX
sed -n -e 's/\t/ /g' -e "s/^ *# *define *$PFX//p" $IN |
while read i
do
# Name is everything up to the first whitespace
@ -31,11 +33,32 @@ trap 'rm "$OUT"' EXIT
# Name is uppercase, VALUE is all lowercase
VALUE="$(echo "$VALUE" | tr A-Z a-z)"
TABCOUNT=$(( ( 5*8 - 14 - $(echo "$NAME" | wc -c) ) / 8 ))
printf "\t[%s]%.*s = %s,\n" \
"X86_FEATURE_$NAME" "$TABCOUNT" "$TABS" "$VALUE"
if [ -n "$POSTFIX" ]; then
T=$(( $PFX_SZ + $(echo $POSTFIX | wc -c) + 2 ))
TABS="$(printf '\t\t\t\t\t\t')"
TABCOUNT=$(( ( 6*8 - ($T + 1) - $(echo "$NAME" | wc -c) ) / 8 ))
printf "\t[%s - %s]%.*s = %s,\n" "$PFX$NAME" "$POSTFIX" "$TABCOUNT" "$TABS" "$VALUE"
else
TABCOUNT=$(( ( 5*8 - ($PFX_SZ + 1) - $(echo "$NAME" | wc -c) ) / 8 ))
printf "\t[%s]%.*s = %s,\n" "$PFX$NAME" "$TABCOUNT" "$TABS" "$VALUE"
fi
done
echo "};"
}
trap 'rm "$OUT"' EXIT
(
echo "#ifndef _ASM_X86_CPUFEATURE_H"
echo "#include <asm/cpufeature.h>"
echo "#endif"
echo ""
dump_array "x86_cap_flags" "NCAPINTS*32" "X86_FEATURE_" ""
echo ""
dump_array "x86_bug_flags" "NBUGINTS*32" "X86_BUG_" "NCAPINTS*32"
) > $OUT
trap - EXIT

8
arch/x86/kernel/cpu/proc.c
View File

@ -97,6 +97,14 @@ static int show_cpuinfo(struct seq_file *m, void *v)
if (cpu_has(c, i) && x86_cap_flags[i] != NULL)
seq_printf(m, " %s", x86_cap_flags[i]);
seq_printf(m, "\nbugs\t\t:");
for (i = 0; i < 32*NBUGINTS; i++) {
unsigned int bug_bit = 32*NCAPINTS + i;
if (cpu_has_bug(c, bug_bit) && x86_bug_flags[i])
seq_printf(m, " %s", x86_bug_flags[i]);
}
seq_printf(m, "\nbogomips\t: %lu.%02lu\n",
c->loops_per_jiffy/(500000/HZ),
(c->loops_per_jiffy/(5000/HZ)) % 100);