diff options
| author | Borislav Petkov (AMD) <bp@alien8.de> | 2024-09-11 11:00:50 +0200 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2025-06-17 17:17:12 +0200 |
| commit | 31272abd5974b38ba312e9cf2ec2f09f9dd7dcba (patch) | |
| tree | 8c90aa6d36a6dd47bb7e1b51b013e986c2ac89bc /arch/x86/kvm/cpuid.c | |
| parent | x86/bugs: Add a Transient Scheduler Attacks mitigation (diff) | |
| download | linux-31272abd5974b38ba312e9cf2ec2f09f9dd7dcba.tar.gz linux-31272abd5974b38ba312e9cf2ec2f09f9dd7dcba.zip | |
KVM: SVM: Advertise TSA CPUID bits to guests
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>
Diffstat (limited to 'arch/x86/kvm/cpuid.c')
| -rw-r--r-- | arch/x86/kvm/cpuid.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index b2d006756e02..f84bc0569c9c 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -1165,6 +1165,8 @@ void kvm_set_cpu_caps(void) */ SYNTHESIZED_F(LFENCE_RDTSC), /* SmmPgCfgLock */ + /* 4: Resv */ + SYNTHESIZED_F(VERW_CLEAR), F(NULL_SEL_CLR_BASE), /* UpperAddressIgnore */ F(AUTOIBRS), @@ -1179,6 +1181,11 @@ void kvm_set_cpu_caps(void) F(SRSO_USER_KERNEL_NO), ); + kvm_cpu_cap_init(CPUID_8000_0021_ECX, + SYNTHESIZED_F(TSA_SQ_NO), + SYNTHESIZED_F(TSA_L1_NO), + ); + kvm_cpu_cap_init(CPUID_8000_0022_EAX, F(PERFMON_V2), ); @@ -1748,8 +1755,9 @@ 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: { |