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target/i386: Add bus lock debug exception support

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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].

Backports 06e878b413766778a53be3d25c0373a23679d039
This commit is contained in:
Chenyi Qiang 2021-03-04 18:49:51 -05:00 committed by Lioncash
parent d044062b26
commit d7adcf1d7f
2 changed files with 3 additions and 1 deletions
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2
qemu/target/i386/cpu.c
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@ -861,7 +861,7 @@ 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 = {

2
qemu/target/i386/cpu.h
View file

@ -714,6 +714,8 @@ 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 */