Commit 8415a748 authored by Kim Phillips's avatar Kim Phillips Committed by Borislav Petkov (AMD)
Browse files

x86/cpu, kvm: Add support for CPUID_80000021_EAX 



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: default avatarKim Phillips <kim.phillips@amd.com>
Signed-off-by: default avatarBorislav Petkov (AMD) <bp@alien8.de>
Acked-by: default avatarSean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20230124163319.2277355-2-kim.phillips@amd.com
parent e12ad468

arch/x86/include/asm/cpufeature.h

+5 −2
Original line number Diff line number Diff line
@@ -32,6 +32,7 @@ enum cpuid_leafs 
	CPUID_8000_0007_EBX,

	CPUID_7_EDX,

	CPUID_8000_001F_EAX,

	CPUID_8000_0021_EAX,

};



#define X86_CAP_FMT_NUM "%d:%d"
@@ -94,8 +95,9 @@ 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) ||	\
@@ -118,8 +120,9 @@ 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 :	\

arch/x86/include/asm/cpufeatures.h

+1 −1
Original line number Diff line number Diff line
@@ -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			1	   /* N 32-bit bug flags */



/*

arch/x86/include/asm/disabled-features.h

+2 −1
Original line number Diff line number Diff line
@@ -124,6 +124,7 @@ 
#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 */

arch/x86/include/asm/required-features.h

+2 −1
Original line number Diff line number Diff line
@@ -98,6 +98,7 @@ 
#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 */

arch/x86/kernel/cpu/common.c

+3 −0
Original line number Diff line number Diff line
@@ -1093,6 +1093,9 @@ 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);