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KVM: SVM: Advertise TSA CPUID bits to guests

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Commit 31272abd5974b38ba312e9cf2ec2f09f9dd7dcba upstream.

Synthesize the TSA CPUID feature bits for guests. Set TSA_{SQ,L1}_NO on
unaffected machines.

Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Borislav Petkov (AMD)
2024-09-11 11:00:50 +02:00
committed by Greg Kroah-Hartman
parent 90293047df
commit 276499bb69
2 changed files with 15 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
arch/x86/kvm/cpuid.c
View File

@@ -780,6 +780,7 @@ void kvm_set_cpu_caps(void)
kvm_cpu_cap_mask(CPUID_8000_0021_EAX,
F(NO_NESTED_DATA_BP) | F(LFENCE_RDTSC) | 0 /* SmmPgCfgLock */ |
F(VERW_CLEAR) |
F(NULL_SEL_CLR_BASE) | F(AUTOIBRS) | 0 /* PrefetchCtlMsr */
);
@@ -790,6 +791,10 @@ void kvm_set_cpu_caps(void)
F(PERFMON_V2)
);
kvm_cpu_cap_init_kvm_defined(CPUID_8000_0021_ECX,
F(TSA_SQ_NO) | F(TSA_L1_NO)
);
/*
* Synthesize "LFENCE is serializing" into the AMD-defined entry in
* KVM's supported CPUID if the feature is reported as supported by the
@@ -1296,8 +1301,9 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
entry->eax = entry->ebx = entry->ecx = entry->edx = 0;
break;
case 0x80000021:
entry->ebx = entry->ecx = entry->edx = 0;
entry->ebx = entry->edx = 0;
cpuid_entry_override(entry, CPUID_8000_0021_EAX);
cpuid_entry_override(entry, CPUID_8000_0021_ECX);
break;
/* AMD Extended Performance Monitoring and Debug */
case 0x80000022: {

8
arch/x86/kvm/reverse_cpuid.h
View File

@@ -17,6 +17,7 @@ enum kvm_only_cpuid_leafs {
CPUID_8000_0007_EDX,
CPUID_8000_0022_EAX,
CPUID_7_2_EDX,
CPUID_8000_0021_ECX,
NR_KVM_CPU_CAPS,
NKVMCAPINTS = NR_KVM_CPU_CAPS - NCAPINTS,
@@ -61,6 +62,10 @@ enum kvm_only_cpuid_leafs {
/* CPUID level 0x80000022 (EAX) */
#define KVM_X86_FEATURE_PERFMON_V2 KVM_X86_FEATURE(CPUID_8000_0022_EAX, 0)
/* CPUID level 0x80000021 (ECX) */
#define KVM_X86_FEATURE_TSA_SQ_NO KVM_X86_FEATURE(CPUID_8000_0021_ECX, 1)
#define KVM_X86_FEATURE_TSA_L1_NO KVM_X86_FEATURE(CPUID_8000_0021_ECX, 2)
struct cpuid_reg {
u32 function;
u32 index;
@@ -90,6 +95,7 @@ static const struct cpuid_reg reverse_cpuid[] = {
[CPUID_8000_0021_EAX] = {0x80000021, 0, CPUID_EAX},
[CPUID_8000_0022_EAX] = {0x80000022, 0, CPUID_EAX},
[CPUID_7_2_EDX] = { 7, 2, CPUID_EDX},
[CPUID_8000_0021_ECX] = {0x80000021, 0, CPUID_ECX},
};
/*
@@ -129,6 +135,8 @@ static __always_inline u32 __feature_translate(int x86_feature)
KVM_X86_TRANSLATE_FEATURE(PERFMON_V2);
KVM_X86_TRANSLATE_FEATURE(RRSBA_CTRL);
KVM_X86_TRANSLATE_FEATURE(BHI_CTRL);
KVM_X86_TRANSLATE_FEATURE(TSA_SQ_NO);
KVM_X86_TRANSLATE_FEATURE(TSA_L1_NO);
default:
return x86_feature;
}