mirrors/qemu
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

target/i386: Expose new feature bits in CPUID 8000_0021_EAX/EBX

Browse Source 
Newer AMD CPUs support ERAPS (Enhanced Return Address Prediction Security)
feature that enables the auto-clear of RSB entries on a TLB flush, context
switches and VMEXITs. The number of default RSP entries is reflected in
RapSize.

Add the feature bit and feature word to support these features.

CPUID_Fn80000021_EAX
Bits   Feature Description
24     ERAPS:
       Indicates support for enhanced return address predictor security.

CPUID_Fn80000021_EBX
Bits   Feature Description
31-24  Reserved
23:16  RapSize:
       Return Address Predictor size. RapSize x 8 is the minimum number
       of CALL instructions software needs to execute to flush the RAP.
15-00  MicrocodePatchSize. Read-only.
       Reports the size of the Microcode patch in 16-byte multiples.
       If 0, the size of the patch is at most 5568 (15C0h) bytes.

Link: https://www.amd.com/content/dam/amd/en/documents/epyc-technical-docs/programmer-references/57238.zip
Signed-off-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/7c62371fe60af1e9bbd853f5f8e949bf2d908bd0.1729807947.git.babu.moger@amd.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Babu Moger 2024-10-24 17:18:24 -05:00 committed by Paolo Bonzini
parent 2ec282b8ea
commit 9c07a7af5d
2 changed files with 18 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
target/i386/cpu.c
View File

@ -1220,13 +1220,19 @@ FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL,
NULL, NULL, NULL, "sbpb",
"eraps", NULL, NULL, "sbpb",
"ibpb-brtype", "srso-no", "srso-user-kernel-no", NULL,
},
.cpuid = { .eax = 0x80000021, .reg = R_EAX, },
.tcg_features = 0,
.unmigratable_flags = 0,
},
[FEAT_8000_0021_EBX] = {
.type = CPUID_FEATURE_WORD,
.cpuid = { .eax = 0x80000021, .reg = R_EBX, },
.tcg_features = 0,
.unmigratable_flags = 0,
},
[FEAT_8000_0022_EAX] = {
.type = CPUID_FEATURE_WORD,
.feat_names = {
@ -7069,8 +7075,9 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
}
break;
case 0x80000021:
*eax = *ebx = *ecx = *edx = 0;
*eax = env->features[FEAT_8000_0021_EAX];
*ebx = *ecx = *edx = 0;
*ebx = env->features[FEAT_8000_0021_EBX];
break;
default:
/* reserved values: zero */

9
target/i386/cpu.h
View File

@ -634,6 +634,7 @@ typedef enum FeatureWord {
FEAT_8000_0007_EDX, /* CPUID[8000_0007].EDX */
FEAT_8000_0008_EBX, /* CPUID[8000_0008].EBX */
FEAT_8000_0021_EAX, /* CPUID[8000_0021].EAX */
FEAT_8000_0021_EBX, /* CPUID[8000_0021].EBX */
FEAT_8000_0022_EAX, /* CPUID[8000_0022].EAX */
FEAT_C000_0001_EDX, /* CPUID[C000_0001].EDX */
FEAT_KVM, /* CPUID[4000_0001].EAX (KVM_CPUID_FEATURES) */
@ -1022,6 +1023,8 @@ uint64_t x86_cpu_get_supported_feature_word(X86CPU *cpu, FeatureWord w);
#define CPUID_8000_0021_EAX_NULL_SEL_CLR_BASE (1U << 6)
/* Automatic IBRS */
#define CPUID_8000_0021_EAX_AUTO_IBRS (1U << 8)
/* Enhanced Return Address Predictor Scurity */
#define CPUID_8000_0021_EAX_ERAPS (1U << 24)
/* Selective Branch Predictor Barrier */
#define CPUID_8000_0021_EAX_SBPB (1U << 27)
/* IBPB includes branch type prediction flushing */
@ -1031,6 +1034,12 @@ uint64_t x86_cpu_get_supported_feature_word(X86CPU *cpu, FeatureWord w);
/* Not vulnerable to SRSO at the user-kernel boundary */
#define CPUID_8000_0021_EAX_SRSO_USER_KERNEL_NO (1U << 30)
/*
* Return Address Predictor size. RapSize x 8 is the minimum number of
* CALL instructions software needs to execute to flush the RAP.
*/
#define CPUID_8000_0021_EBX_RAPSIZE (8U << 16)
/* Performance Monitoring Version 2 */
#define CPUID_8000_0022_EAX_PERFMON_V2 (1U << 0)