From: Tom Lendacky <thomas.lendacky@amd.com>
To: x86@kernel.org, linux-kernel@vger.kernel.org
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
Borislav Petkov <bpetkov@suse.de>,
David Woodhouse <dwmw@amazon.co.uk>
Subject: [PATCH 1/2] x86/bugs: Update when to check for the LS_CFG SSBD mitigation
Date: Mon, 02 Jul 2018 16:35:53 -0500 [thread overview]
Message-ID: <20180702213553.29202.21089.stgit@tlendack-t1.amdoffice.net> (raw)
In-Reply-To: <20180702213543.29202.79104.stgit@tlendack-t1.amdoffice.net>
If either the X86_FEATURE_AMD_SSBD or X86_FEATURE_VIRT_SSBD features are
present, then there is no need to perform the check for the LS_CFG SSBD
mitigation support.
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
---
arch/x86/kernel/cpu/amd.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index 082d787..38915fb 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -543,7 +543,9 @@ static void bsp_init_amd(struct cpuinfo_x86 *c)
nodes_per_socket = ((value >> 3) & 7) + 1;
}
- if (c->x86 >= 0x15 && c->x86 <= 0x17) {
+ if (!boot_cpu_has(X86_FEATURE_AMD_SSBD) &&
+ !boot_cpu_has(X86_FEATURE_VIRT_SSBD) &&
+ c->x86 >= 0x15 && c->x86 <= 0x17) {
unsigned int bit;
switch (c->x86) {
next prev parent reply other threads:[~2018-07-02 21:36 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-02 21:35 [PATCH 0/2] x86/bugs: Updates to SSBD support on AMD Tom Lendacky
2018-07-02 21:35 ` Tom Lendacky [this message]
2018-07-03 8:33 ` [tip:x86/pti] x86/bugs: Update when to check for the LS_CFG SSBD mitigation tip-bot for Tom Lendacky
2018-07-03 14:12 ` [PATCH 1/2] " Konrad Rzeszutek Wilk
2018-07-02 21:36 ` [PATCH 2/2] x86/bugs: Fix the AMD SSBD usage of the SPEC_CTRL MSR Tom Lendacky
2018-07-03 8:34 ` [tip:x86/pti] " tip-bot for Tom Lendacky
2018-07-03 14:12 ` [PATCH 2/2] " Konrad Rzeszutek Wilk
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