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x86/cpu, kvm: Add support for CPUID_80000021_EAX

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commit 8415a74852d7c24795007ee9862d25feb519007c upstream.

Add support for CPUID leaf 80000021, EAX. The majority of the features will be
used in the kernel and thus a separate leaf is appropriate.

Include KVM's reverse_cpuid entry because features are used by VM guests, too.

  [ bp: Massage commit message. ]

Signed-off-by: Kim Phillips <kim.phillips@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Acked-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20230124163319.2277355-2-kim.phillips@amd.com
[bwh: Backported to 6.1: adjust context]
Signed-off-by: Ben Hutchings <benh@debian.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kim Phillips 2023-01-10 16:46:37 -06:00 committed by Greg Kroah-Hartman
parent 073a28a9b5
commit 34f23ba8a3
6 changed files with 14 additions and 5 deletions
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7
arch/x86/include/asm/cpufeature.h
View File

@ -32,6 +32,7 @@ enum cpuid_leafs
CPUID_8000_0007_EBX,
CPUID_7_EDX,
CPUID_8000_001F_EAX,
CPUID_8000_0021_EAX,
};
#ifdef CONFIG_X86_FEATURE_NAMES
@ -91,8 +92,9 @@ extern const char * const x86_bug_flags[NBUGINTS*32];
CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 17, feature_bit) || \
CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 18, feature_bit) || \
CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 19, feature_bit) || \
CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 20, feature_bit) || \
REQUIRED_MASK_CHECK || \
BUILD_BUG_ON_ZERO(NCAPINTS != 20))
BUILD_BUG_ON_ZERO(NCAPINTS != 21))
#define DISABLED_MASK_BIT_SET(feature_bit) \
( CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 0, feature_bit) || \
@ -115,8 +117,9 @@ extern const char * const x86_bug_flags[NBUGINTS*32];
CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 17, feature_bit) || \
CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 18, feature_bit) || \
CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 19, feature_bit) || \
CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 20, feature_bit) || \
DISABLED_MASK_CHECK || \
BUILD_BUG_ON_ZERO(NCAPINTS != 20))
BUILD_BUG_ON_ZERO(NCAPINTS != 21))
#define cpu_has(c, bit) \
(__builtin_constant_p(bit) && REQUIRED_MASK_BIT_SET(bit) ? 1 : \

2
arch/x86/include/asm/cpufeatures.h
View File

@ -13,7 +13,7 @@
/*
* Defines x86 CPU feature bits
*/
#define NCAPINTS 20 /* N 32-bit words worth of info */
#define NCAPINTS 21 /* N 32-bit words worth of info */
#define NBUGINTS 2 /* N 32-bit bug flags */
/*

3
arch/x86/include/asm/disabled-features.h
View File

@ -102,6 +102,7 @@
#define DISABLED_MASK17 0
#define DISABLED_MASK18 0
#define DISABLED_MASK19 0
#define DISABLED_MASK_CHECK BUILD_BUG_ON_ZERO(NCAPINTS != 20)
#define DISABLED_MASK20 0
#define DISABLED_MASK_CHECK BUILD_BUG_ON_ZERO(NCAPINTS != 21)
#endif /* _ASM_X86_DISABLED_FEATURES_H */

3
arch/x86/include/asm/required-features.h
View File

@ -102,6 +102,7 @@
#define REQUIRED_MASK17 0
#define REQUIRED_MASK18 0
#define REQUIRED_MASK19 0
#define REQUIRED_MASK_CHECK BUILD_BUG_ON_ZERO(NCAPINTS != 20)
#define REQUIRED_MASK20 0
#define REQUIRED_MASK_CHECK BUILD_BUG_ON_ZERO(NCAPINTS != 21)
#endif /* _ASM_X86_REQUIRED_FEATURES_H */

3
arch/x86/kernel/cpu/common.c
View File

@ -969,6 +969,9 @@ void get_cpu_cap(struct cpuinfo_x86 *c)
if (c->extended_cpuid_level >= 0x8000001f)
c->x86_capability[CPUID_8000_001F_EAX] = cpuid_eax(0x8000001f);
if (c->extended_cpuid_level >= 0x80000021)
c->x86_capability[CPUID_8000_0021_EAX] = cpuid_eax(0x80000021);
init_scattered_cpuid_features(c);
init_speculation_control(c);

1
arch/x86/kvm/cpuid.h
View File

@ -63,6 +63,7 @@ static const struct cpuid_reg reverse_cpuid[] = {
[CPUID_8000_0007_EBX] = {0x80000007, 0, CPUID_EBX},
[CPUID_7_EDX] = { 7, 0, CPUID_EDX},
[CPUID_7_1_EAX] = { 7, 1, CPUID_EAX},
[CPUID_8000_0021_EAX] = {0x80000021, 0, CPUID_EAX},
};
/*