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From: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
To: speck@linutronix.de
Subject: [MODERATED] [PATCH 2/9] TAA v2 2
Date: Wed, 23 Oct 2019 10:52:35 +0200	[thread overview]
Message-ID: <760b742eae3b18d6a21ff0e395b259ecf0d8a6c7.1572168937.git.bp@suse.de> (raw)
In-Reply-To: <cover.1572168937.git.bp@suse.de>

From: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Subject: [PATCH 2/9] x86/cpu: Add a helper function x86_read_arch_cap_msr()

Add a helper function to read the IA32_ARCH_CAPABILITIES MSR.

Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Mark Gross <mgross@linux.intel.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com>
Tested-by: Neelima Krishnan <neelima.krishnan@intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: x86-ml <x86@kernel.org>
---
 arch/x86/kernel/cpu/common.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 9ae7d1bcd4f4..897c8302d982 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -1092,19 +1092,26 @@ static bool __init cpu_matches(unsigned long which)
 	return m && !!(m->driver_data & which);
 }
 
-static void __init cpu_set_bug_bits(struct cpuinfo_x86 *c)
+u64 x86_read_arch_cap_msr(void)
 {
 	u64 ia32_cap = 0;
 
+	if (boot_cpu_has(X86_FEATURE_ARCH_CAPABILITIES))
+		rdmsrl(MSR_IA32_ARCH_CAPABILITIES, ia32_cap);
+
+	return ia32_cap;
+}
+
+static void __init cpu_set_bug_bits(struct cpuinfo_x86 *c)
+{
+	u64 ia32_cap = x86_read_arch_cap_msr();
+
 	if (cpu_matches(NO_SPECULATION))
 		return;
 
 	setup_force_cpu_bug(X86_BUG_SPECTRE_V1);
 	setup_force_cpu_bug(X86_BUG_SPECTRE_V2);
 
-	if (cpu_has(c, X86_FEATURE_ARCH_CAPABILITIES))
-		rdmsrl(MSR_IA32_ARCH_CAPABILITIES, ia32_cap);
-
 	if (!cpu_matches(NO_SSB) && !(ia32_cap & ARCH_CAP_SSB_NO) &&
 	   !cpu_has(c, X86_FEATURE_AMD_SSB_NO))
 		setup_force_cpu_bug(X86_BUG_SPEC_STORE_BYPASS);
-- 
2.21.0

  parent reply	other threads:[~2019-10-27  9:42 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-27  9:35 [MODERATED] [PATCH 0/9] TAA v2 0 Borislav Petkov
2019-10-23  8:45 ` [MODERATED] [PATCH 1/9] TAA v2 1 Pawan Gupta
2019-10-23  8:52 ` Pawan Gupta [this message]
2019-10-28  7:36   ` [PATCH 2/9] TAA v2 2 Thomas Gleixner
2019-10-23  9:01 ` [MODERATED] [PATCH 3/9] TAA v2 3 Pawan Gupta
2019-10-23  9:30 ` [MODERATED] [PATCH 4/9] TAA v2 4 Pawan Gupta
2019-10-23 10:19 ` [MODERATED] [PATCH 5/9] TAA v2 5 Pawan Gupta
2019-10-23 10:23 ` [MODERATED] [PATCH 6/9] TAA v2 6 Pawan Gupta
2019-10-23 10:28 ` [MODERATED] [PATCH 7/9] TAA v2 7 Pawan Gupta
2019-10-23 10:32 ` [MODERATED] [PATCH 8/9] TAA v2 8 Pawan Gupta
2019-10-23 10:35 ` [MODERATED] [PATCH 9/9] TAA v2 9 Michal Hocko

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