| Message ID | 20240919051011.118309-1-chao.gao@intel.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | target/i386: Add more features enumerated by CPUID.7.2.EDX | expand |
diff --git a/target/i386/cpu.c b/target/i386/cpu.c index 85ef7452c0..18ba958f46 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -1148,8 +1148,8 @@ FeatureWordInfo feature_word_info[FEATURE_WORDS] = { [FEAT_7_2_EDX] = { .type = CPUID_FEATURE_WORD, .feat_names = { - NULL, NULL, NULL, NULL, - NULL, "mcdt-no", NULL, NULL, + "intel-psfd", "ipred-ctrl", "rrsba-ctrl", "ddpd-u", + "bhi-ctrl", "mcdt-no", NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
Following 5 bits in CPUID.7.2.EDX are supported by KVM. Add their supports in QEMU. Each of them indicates certain bits of IA32_SPEC_CTRL are supported. Those bits can control CPU speculation behavior which can be used to defend against side-channel attacks. bit0: intel-psfd if 1, indicates bit 7 of the IA32_SPEC_CTRL MSR is supported. Bit 7 of this MSR disables Fast Store Forwarding Predictor without disabling Speculative Store Bypass bit1: ipred-ctrl If 1, indicates bits 3 and 4 of the IA32_SPEC_CTRL MSR are supported. Bit 3 of this MSR enables IPRED_DIS control for CPL3. Bit 4 of this MSR enables IPRED_DIS control for CPL0/1/2 bit2: rrsba-ctrl If 1, indicates bits 5 and 6 of the IA32_SPEC_CTRL MSR are supported. Bit 5 of this MSR disables RRSBA behavior for CPL3. Bit 6 of this MSR disables RRSBA behavior for CPL0/1/2 bit3: ddpd-u If 1, indicates bit 8 of the IA32_SPEC_CTRL MSR is supported. Bit 8 of this MSR disables Data Dependent Prefetcher. bit4: bhi-ctrl if 1, indicates bit 10 of the IA32_SPEC_CTRL MSR is supported. Bit 10 of this MSR enables BHI_DIS_S behavior. Signed-off-by: Chao Gao <chao.gao@intel.com> --- target/i386/cpu.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)