On 5/31/2023 9:32 AM, Binbin Wu wrote:
From: Robert Hoo <robert...@linux.intel.com>
Linear Address Masking (LAM) is a new Intel CPU feature, which allows software
to use of the untranslated address bits for metadata.
The bit definition:
CPUID.(EAX=7,ECX=1):EAX[26]
Add CPUID definition for LAM.
More info can be found in Intel ISE Chapter "LINEAR ADDRESS MASKING (LAM)"
https://cdrdv2.intel.com/v1/dl/getContent/671368
LAM defines new bits in CR3 and CR4. I think it needs corresponding
support in QEMU as well.
Signed-off-by: Robert Hoo <robert...@linux.intel.com>
Co-developed-by: Binbin Wu <binbin...@linux.intel.com>
Signed-off-by: Binbin Wu <binbin...@linux.intel.com>
---
target/i386/cpu.c | 2 +-
target/i386/cpu.h | 2 ++
2 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 1242bd541a..f4436b3657 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -881,7 +881,7 @@ FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
"fsrc", NULL, NULL, NULL,
NULL, NULL, NULL, NULL,
NULL, "amx-fp16", NULL, "avx-ifma",
- NULL, NULL, NULL, NULL,
+ NULL, NULL, "lam", NULL,
NULL, NULL, NULL, NULL,
},
.cpuid = {
diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index 7201a71de8..eb800ba2e2 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -924,6 +924,8 @@ uint64_t x86_cpu_get_supported_feature_word(FeatureWord w,
#define CPUID_7_1_EAX_AMX_FP16 (1U << 21)
/* Support for VPMADD52[H,L]UQ */
#define CPUID_7_1_EAX_AVX_IFMA (1U << 23)
+/* Linear Address Masking */
+#define CPUID_7_1_EAX_LAM (1U << 26)
/* Support for VPDPB[SU,UU,SS]D[,S] */
#define CPUID_7_1_EDX_AVX_VNNI_INT8 (1U << 4)
