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x86/bugs: Add AMD's variant of SSB_NO

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The AMD document outlining the SSBD handling
124441_AMD64_SpeculativeStoreBypassDisable_Whitepaper_final.pdf
mentions that the CPUID 8000_0008.EBX[26] will mean that the
speculative store bypass disable is no longer needed.

A copy of this document is available at:
    https://bugzilla.kernel.org/show_bug.cgi?id=199889

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Janakarajan Natarajan <Janakarajan.Natarajan@amd.com>
Cc: kvm@vger.kernel.org
Cc: andrew.cooper3@citrix.com
Cc: Andy Lutomirski <luto@kernel.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Woodhouse <dwmw@amazon.co.uk>
Link: https://lkml.kernel.org/r/20180601145921.9500-2-konrad.wilk@oracle.com
This commit is contained in:
Konrad Rzeszutek Wilk
2018-06-01 10:59:19 -04:00
committed by Thomas Gleixner
parent 716a685fdb
commit 2480986001
3 changed files with 4 additions and 2 deletions
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3
arch/x86/kernel/cpu/common.c
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@@ -992,7 +992,8 @@ static void __init cpu_set_bug_bits(struct cpuinfo_x86 *c)
rdmsrl(MSR_IA32_ARCH_CAPABILITIES, ia32_cap);
if (!x86_match_cpu(cpu_no_spec_store_bypass) &&
!(ia32_cap & ARCH_CAP_SSB_NO))
!(ia32_cap & ARCH_CAP_SSB_NO) &&
!cpu_has(c, X86_FEATURE_AMD_SSB_NO))
setup_force_cpu_bug(X86_BUG_SPEC_STORE_BYPASS);
if (x86_match_cpu(cpu_no_meltdown))