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| author | Chenyi Qiang <chenyi.qiang@intel.com> | 2021-02-02 17:02:24 +0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-02-25 14:14:33 +0100 |
| commit | 06e878b413766778a53be3d25c0373a23679d039 (patch) | |
| tree | 5fbaf0ce96a47137306a10bd2321394951f081e8 | |
| parent | 3a2e982d4774993290a12c75f5918e3caec80d2b (diff) | |
| download | qemu-06e878b413766778a53be3d25c0373a23679d039.zip qemu-06e878b413766778a53be3d25c0373a23679d039.tar.gz qemu-06e878b413766778a53be3d25c0373a23679d039.tar.bz2 | |
target/i386: Add bus lock debug exception support
Bus lock debug exception is a feature that can notify the kernel by
generate an #DB trap after the instruction acquires a bus lock when
CPL>0. This allows the kernel to enforce user application throttling or
mitigations.
This feature is enumerated via CPUID.(EAX=7,ECX=0).ECX[bit 24].
Signed-off-by: Chenyi Qiang <chenyi.qiang@intel.com>
Message-Id: <20210202090224.13274-1-chenyi.qiang@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | target/i386/cpu.c | 2 | ||||
| -rw-r--r-- | target/i386/cpu.h | 2 |
2 files changed, 3 insertions, 1 deletions
diff --git a/target/i386/cpu.c b/target/i386/cpu.c index bc69565..5000843 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -963,7 +963,7 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = { "avx512bitalg", NULL, "avx512-vpopcntdq", NULL, "la57", NULL, NULL, NULL, NULL, NULL, "rdpid", NULL, - NULL, "cldemote", NULL, "movdiri", + "bus-lock-detect", "cldemote", NULL, "movdiri", "movdir64b", NULL, NULL, "pks", }, .cpuid = { diff --git a/target/i386/cpu.h b/target/i386/cpu.h index 8be39cf..b4b136c 100644 --- a/target/i386/cpu.h +++ b/target/i386/cpu.h @@ -769,6 +769,8 @@ typedef uint64_t FeatureWordArray[FEATURE_WORDS]; #define CPUID_7_0_ECX_LA57 (1U << 16) /* Read Processor ID */ #define CPUID_7_0_ECX_RDPID (1U << 22) +/* Bus Lock Debug Exception */ +#define CPUID_7_0_ECX_BUS_LOCK_DETECT (1U << 24) /* Cache Line Demote Instruction */ #define CPUID_7_0_ECX_CLDEMOTE (1U << 25) /* Move Doubleword as Direct Store Instruction */ |