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x86: Fix tst-cpu-features-cpuinfo on Ryzen 9 (BZ #27873)

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AMD define different flags for IRPB, IBRS, and STIPBP [1], so new
x86_64_cpu are added and IBRS_IBPB is only tested for Intel.

The SSDB is also defined and implemented different on AMD [2],
and also a new AMD_SSDB flag is added.  It should map to the
cpuinfo 'ssdb' on recent AMD cpus.

It fixes tst-cpu-features-cpuinfo and tst-cpu-features-cpuinfo-static
on recent AMD cpus.

Checked on x86_64-linux-gnu on AMD Ryzen 9 5900X.

[1] https://developer.amd.com/wp-content/resources/Architecture_Guidelines_Update_Indirect_Branch_Control.pdf
[2] https://bugzilla.kernel.org/show_bug.cgi?id=199889

Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
This commit is contained in:
Adhemerval Zanella
2021-06-22 16:41:28 -03:00
parent ea26ff0322
commit e3e3eb0a2e
4 changed files with 46 additions and 4 deletions
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12
sysdeps/x86/include/cpu-features.h
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@@ -289,6 +289,10 @@ enum
/* EBX. */
#define bit_cpu_WBNOINVD (1u << 9)
#define bit_cpu_AMD_IBPB (1u << 12)
#define bit_cpu_AMD_IBRS (1u << 14)
#define bit_cpu_AMD_STIBP (1u << 15)
#define bit_cpu_AMD_SSBD (1u << 24)
/* CPUID_INDEX_7_ECX_1. */
@@ -519,6 +523,10 @@ enum
/* EBX. */
#define index_cpu_WBNOINVD CPUID_INDEX_80000008
#define index_cpu_AMD_IBPB CPUID_INDEX_80000008
#define index_cpu_AMD_IBRS CPUID_INDEX_80000008
#define index_cpu_AMD_STIBP CPUID_INDEX_80000008
#define index_cpu_AMD_SSBD CPUID_INDEX_80000008
/* CPUID_INDEX_7_ECX_1. */
@@ -749,6 +757,10 @@ enum
/* EBX. */
#define reg_WBNOINVD ebx
#define reg_AMD_IBPB ebx
#define reg_AMD_IBRS ebx
#define reg_AMD_STIBP ebx
#define reg_AMD_SSBD ebx
/* CPUID_INDEX_7_ECX_1. */