x86/cpu, kvm: Add support for CPUID_80000021_EAX

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>

diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
index b0f206681fde3b8da3ad3ac02779ec8de227b45c..cc3f62f5d5515033adeeaba6855ba8838935ad13 100644 (file)
--- a/arch/x86/include/asm/cpufeature.h
+++ b/arch/x86/include/asm/cpufeature.h
@@ -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 :  \

diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index 1dd57d0151f774946c7dc78f5983fcbbb10732f5..0a23f7d4aff73087e4342ee1811181f5a8841549 100644 (file)
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -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 */
 
 /*

diff --git a/arch/x86/include/asm/disabled-features.h b/arch/x86/include/asm/disabled-features.h
index 834a3b6d81e121e4e61227edaa6023abb20240f9..99a12012c66ee5ef0b917fe8bad5f5a4ec20a7c5 100644 (file)
--- a/arch/x86/include/asm/disabled-features.h
+++ b/arch/x86/include/asm/disabled-features.h
@@ -108,6 +108,7 @@
 #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 */

diff --git a/arch/x86/include/asm/required-features.h b/arch/x86/include/asm/required-features.h
index b2d504f119370c72bd0e3e2e1c8b9d397390058d..9bf60a8b9e9c2181fd213b006824def74dacda65 100644 (file)
--- a/arch/x86/include/asm/required-features.h
+++ b/arch/x86/include/asm/required-features.h
@@ -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 */

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 96be8c03fd227dd555f85330e3187ab2154566e0..6555c0c83e79ec7d303656f59a4dee0382514200 100644 (file)
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -968,6 +968,9 @@ 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);
 

diff --git a/arch/x86/kvm/reverse_cpuid.h b/arch/x86/kvm/reverse_cpuid.h
index a19d473d01847d120543c7d42422809ee8f348b9..7eeade35a425bfa53edd6a70bb0676446c8fa6dd 100644 (file)
--- a/arch/x86/kvm/reverse_cpuid.h
+++ b/arch/x86/kvm/reverse_cpuid.h
@@ -48,6 +48,7 @@ static const struct cpuid_reg reverse_cpuid[] = {
        [CPUID_7_1_EAX]       = {         7, 1, CPUID_EAX},
        [CPUID_12_EAX]        = {0x00000012, 0, CPUID_EAX},
        [CPUID_8000_001F_EAX] = {0x8000001f, 0, CPUID_EAX},
+       [CPUID_8000_0021_EAX] = {0x80000021, 0, CPUID_EAX},
 };
 
 /*