Commit fb215366 authored by Liu, Jinsong's avatar Liu, Jinsong Committed by Avi Kivity
Browse files

KVM: expose latest Intel cpu new features (BMI1/BMI2/FMA/AVX2) to guest 

Intel latest cpu add 6 new features, refer http://software.intel.com/file/36945


The new feature cpuid listed as below:

1. FMA		CPUID.EAX=01H:ECX.FMA[bit 12]
2. MOVBE	CPUID.EAX=01H:ECX.MOVBE[bit 22]
3. BMI1		CPUID.EAX=07H,ECX=0H:EBX.BMI1[bit 3]
4. AVX2		CPUID.EAX=07H,ECX=0H:EBX.AVX2[bit 5]
5. BMI2		CPUID.EAX=07H,ECX=0H:EBX.BMI2[bit 8]
6. LZCNT	CPUID.EAX=80000001H:ECX.LZCNT[bit 5]

This patch expose these features to guest.
Among them, FMA/MOVBE/LZCNT has already been defined, MOVBE/LZCNT has
already been exposed.

This patch defines BMI1/AVX2/BMI2, and exposes FMA/BMI1/AVX2/BMI2 to guest.

Signed-off-by: default avatarLiu, Jinsong <jinsong.liu@intel.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 00b27a3e

arch/x86/include/asm/cpufeature.h

+3 −0
Original line number Diff line number Diff line
@@ -197,7 +197,10 @@ 


/* Intel-defined CPU features, CPUID level 0x00000007:0 (ebx), word 9 */

#define X86_FEATURE_FSGSBASE	(9*32+ 0) /* {RD/WR}{FS/GS}BASE instructions*/

#define X86_FEATURE_BMI1	(9*32+ 3) /* 1st group bit manipulation extensions */

#define X86_FEATURE_AVX2	(9*32+ 5) /* AVX2 instructions */

#define X86_FEATURE_SMEP	(9*32+ 7) /* Supervisor Mode Execution Protection */

#define X86_FEATURE_BMI2	(9*32+ 8) /* 2nd group bit manipulation extensions */

#define X86_FEATURE_ERMS	(9*32+ 9) /* Enhanced REP MOVSB/STOSB */



#if defined(__KERNEL__) && !defined(__ASSEMBLY__)

arch/x86/kvm/cpuid.c

+2 −2
Original line number Diff line number Diff line
@@ -222,7 +222,7 @@ static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function, 
		F(XMM3) | F(PCLMULQDQ) | 0 /* DTES64, MONITOR */ |

		0 /* DS-CPL, VMX, SMX, EST */ |

		0 /* TM2 */ | F(SSSE3) | 0 /* CNXT-ID */ | 0 /* Reserved */ |

		0 /* Reserved */ | F(CX16) | 0 /* xTPR Update, PDCM */ |

		F(FMA) | F(CX16) | 0 /* xTPR Update, PDCM */ |

		0 /* Reserved, DCA */ | F(XMM4_1) |

		F(XMM4_2) | F(X2APIC) | F(MOVBE) | F(POPCNT) |

		0 /* Reserved*/ | F(AES) | F(XSAVE) | 0 /* OSXSAVE */ | F(AVX) |
@@ -242,7 +242,7 @@ static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function, 


	/* cpuid 7.0.ebx */

	const u32 kvm_supported_word9_x86_features =

		F(SMEP) | F(FSGSBASE) | F(ERMS);

		F(FSGSBASE) | F(BMI1) | F(AVX2) | F(SMEP) | F(BMI2) | F(ERMS);



	/* all calls to cpuid_count() should be made on the same cpu */

	get_cpu();

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