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Date:   Sun,  7 Feb 2021 10:42:55 -0500
From:   Jing Liu <jing2.liu@...ux.intel.com>
To:     pbonzini@...hat.com, seanjc@...gle.com, kvm@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, jing2.liu@...el.com
Subject: [PATCH RFC 6/7] kvm: x86: Add AMX_TILE, AMX_INT8 and AMX_BF16 support

Intel introduces AMX architecture in SPR platform, which includes
AMX_TILE, AMX_INT8 and AMX_BF16 support.

Exposes these features to KVM guest.

Signed-off-by: Jing Liu <jing2.liu@...ux.intel.com>
---
 arch/x86/kvm/cpuid.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index ee1fac0a865e..1b3ea9195a75 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -423,7 +423,8 @@ void kvm_set_cpu_caps(void)
 		F(AVX512_4VNNIW) | F(AVX512_4FMAPS) | F(SPEC_CTRL) |
 		F(SPEC_CTRL_SSBD) | F(ARCH_CAPABILITIES) | F(INTEL_STIBP) |
 		F(MD_CLEAR) | F(AVX512_VP2INTERSECT) | F(FSRM) |
-		F(SERIALIZE) | F(TSXLDTRK)
+		F(SERIALIZE) | F(TSXLDTRK) |
+		F(AMX_TILE) | F(AMX_INT8) | F(AMX_BF16)
 	);
 
 	/* TSC_ADJUST and ARCH_CAPABILITIES are emulated in software. */
@@ -544,6 +545,8 @@ static struct kvm_cpuid_entry2 *do_host_cpuid(struct kvm_cpuid_array *array,
 	case 0x14:
 	case 0x17:
 	case 0x18:
+	case 0x1d:
+	case 0x1e:
 	case 0x1f:
 	case 0x8000001d:
 		entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
@@ -667,6 +670,8 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
 		break;
 	case 9:
 		break;
+	case 0x1e:
+		break;
 	case 0xa: { /* Architectural Performance Monitoring */
 		struct x86_pmu_capability cap;
 		union cpuid10_eax eax;
@@ -766,9 +771,12 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
 			entry->edx = 0;
 		}
 		break;
+	/* Intel AMX TILE */
+	case 0x1d:
 	/* Intel PT */
 	case 0x14:
-		if (!kvm_cpu_cap_has(X86_FEATURE_INTEL_PT)) {
+		if ((function == 0x14 && !kvm_cpu_cap_has(X86_FEATURE_INTEL_PT)) ||
+		    (function == 0x1d && !kvm_cpu_cap_has(X86_FEATURE_AMX_TILE))) {
 			entry->eax = entry->ebx = entry->ecx = entry->edx = 0;
 			break;
 		}
-- 
2.18.4

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