From: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
To: speck@linutronix.de
Subject: [MODERATED] [PATCH v5 02/11] TAAv5 2
Date: Fri, 4 Oct 2019 23:27:31 -0700 [thread overview]
Message-ID: <=?utf-8?q?=3Ce6fbe7bb3310c7bd6603af8dc80409425d7ef759=2E157025?= =?utf-8?q?5065=2Egit=2Epawan=2Ekumar=2Egupta=40linux=2Eintel=2Ecom=3E?=> (raw)
In-Reply-To: <cover.1570255065.git.pawan.kumar.gupta@linux.intel.com>
Move IA32_ARCH_CAPABILITIES MSR read to a helper function. If the CPU
doesn't support this MSR return 0. Use this function in following
commits to read IA32_ARCH_CAPABILITIES MSR.
Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Reviewed-by: Mark Gross <mgross@linux.intel.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Tested-by: Neelima Krishnan <neelima.krishnan@intel.com>
---
arch/x86/kernel/cpu/common.c | 16 ++++++++++++----
1 file changed, 12 insertions(+), 4 deletions(-)
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index f125bf7ecb6f..af9e357b2ca9 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -1091,19 +1091,27 @@ 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 read_ia32_arch_cap(void)
{
u64 ia32_cap = 0;
+ /* Leave the MSR set to all 0's when not supported */
+ 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 = read_ia32_arch_cap();
+
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);
--
2.20.1
next prev parent reply other threads:[~2019-10-05 6:33 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-05 6:17 [MODERATED] [PATCH v5 00/11] TAAv5 0 Pawan Gupta
2019-10-05 6:26 ` [MODERATED] [PATCH v5 01/11] TAAv5 1 Pawan Gupta
2019-10-05 6:27 ` Pawan Gupta [this message]
2019-10-05 6:28 ` [MODERATED] [PATCH v5 03/11] TAAv5 3 Pawan Gupta
2019-10-05 6:29 ` [MODERATED] [PATCH v5 04/11] TAAv5 4 Pawan Gupta
2019-10-05 6:30 ` [MODERATED] [PATCH v5 05/11] TAAv5 5 Pawan Gupta
2019-10-05 6:31 ` [MODERATED] [PATCH v5 06/11] TAAv5 6 Pawan Gupta
2019-10-05 6:32 ` [MODERATED] [PATCH v5 07/11] TAAv5 7 Pawan Gupta
2019-10-05 6:33 ` [MODERATED] [PATCH v5 08/11] TAAv5 8 Pawan Gupta
2019-10-05 6:34 ` [MODERATED] [PATCH v5 09/11] TAAv5 9 Pawan Gupta
2019-10-05 6:35 ` [MODERATED] [PATCH v5 10/11] TAAv5 10 Pawan Gupta
2019-10-05 6:36 ` [MODERATED] [PATCH v5 11/11] TAAv5 11 Pawan Gupta
2019-10-05 10:54 ` [MODERATED] Re: [PATCH v5 02/11] TAAv5 2 Borislav Petkov
2019-10-07 17:48 ` Pawan Gupta
[not found] ` <5d98396a.1c69fb81.6c7a8.23b1SMTPIN_ADDED_BROKEN@mx.google.com>
2019-10-05 21:43 ` [MODERATED] Re: [PATCH v5 03/11] TAAv5 3 Andy Lutomirski
2019-10-07 17:50 ` Pawan Gupta
[not found] ` <5d9839a4.1c69fb81.238e9.8312SMTPIN_ADDED_BROKEN@mx.google.com>
2019-10-05 21:45 ` [MODERATED] Re: [PATCH v5 04/11] TAAv5 4 Andy Lutomirski
[not found] ` <5d983ad2.1c69fb81.63edd.6575SMTPIN_ADDED_BROKEN@mx.google.com>
2019-10-05 21:49 ` [MODERATED] Re: [PATCH v5 09/11] TAAv5 9 Andy Lutomirski
2019-10-07 18:35 ` Pawan Gupta
[not found] ` <5d9838f1.1c69fb81.f1bab.d886SMTPIN_ADDED_BROKEN@mx.google.com>
2019-10-05 21:49 ` [MODERATED] Re: [PATCH v5 01/11] TAAv5 1 Andy Lutomirski
2019-10-06 17:40 ` Andrew Cooper
[not found] ` <5d983ad2.1c69fb81.e6640.8f51SMTPIN_ADDED_BROKEN@mx.google.com>
2019-10-06 17:06 ` [MODERATED] Re: [PATCH v5 09/11] TAAv5 9 Greg KH
2019-10-08 6:01 ` Pawan Gupta
2019-10-10 21:31 ` Pawan Gupta
2019-10-11 8:45 ` Greg KH
2019-10-21 8:00 ` Thomas Gleixner
2019-10-08 2:46 ` [MODERATED] Re: [PATCH v5 05/11] TAAv5 5 Josh Poimboeuf
2019-10-09 1:45 ` Pawan Gupta
2019-10-08 2:57 ` [MODERATED] Re: [PATCH v5 09/11] TAAv5 9 Josh Poimboeuf
2019-10-08 6:10 ` Pawan Gupta
2019-10-08 10:49 ` Jiri Kosina
2019-10-09 13:12 ` [MODERATED] Re: ***UNCHECKED*** [PATCH v5 08/11] TAAv5 8 Michal Hocko
2019-10-14 19:41 ` Thomas Gleixner
2019-10-14 19:51 ` [MODERATED] " Jiri Kosina
2019-10-14 21:04 ` [MODERATED] " Borislav Petkov
2019-10-14 21:31 ` Jiri Kosina
2019-10-15 8:01 ` Thomas Gleixner
2019-10-15 10:34 ` [MODERATED] Re: ***UNCHECKED*** " Michal Hocko
2019-10-15 13:06 ` Josh Poimboeuf
2019-10-15 13:10 ` Jiri Kosina
2019-10-15 15:26 ` Josh Poimboeuf
2019-10-15 15:32 ` Jiri Kosina
2019-10-15 19:34 ` Tyler Hicks
2019-10-15 20:00 ` Josh Poimboeuf
2019-10-15 20:15 ` Jiri Kosina
2019-10-15 20:35 ` Jiri Kosina
2019-10-15 20:54 ` Josh Poimboeuf
2019-10-15 20:56 ` [MODERATED] " Pawan Gupta
2019-10-15 21:14 ` Jiri Kosina
2019-10-15 23:12 ` Josh Poimboeuf
2019-10-15 23:13 ` [MODERATED] [AUTOREPLY] [MODERATED] [AUTOREPLY] Automatic reply: " James, Hengameh M
2019-10-16 4:52 ` [MODERATED] " Jiri Kosina
2019-10-16 5:05 ` Jiri Kosina
2019-10-21 21:15 ` Luck, Tony
2019-10-16 7:14 ` Josh Poimboeuf
2019-10-16 7:20 ` Jiri Kosina
2019-10-18 1:17 ` Ben Hutchings
2019-10-18 4:04 ` Pawan Gupta
2019-10-15 17:47 ` Borislav Petkov
2019-10-16 7:26 ` [MODERATED] Re: ***UNCHECKED*** " Jiri Kosina
2019-10-16 7:54 ` [MODERATED] Re: ***UNCHECKED*** " Michal Hocko
2019-10-16 9:23 ` [MODERATED] Re: ***UNCHECKED*** " Michal Hocko
2019-10-16 12:15 ` Thomas Gleixner
2019-10-16 18:34 ` [MODERATED] " Pawan Gupta
2019-10-18 0:14 ` Pawan Gupta
2019-10-21 8:09 ` Thomas Gleixner
2019-10-21 12:54 ` [MODERATED] Re: ***UNCHECKED*** " Michal Hocko
2019-10-21 20:01 ` [MODERATED] " Pawan Gupta
2019-10-21 20:33 ` Josh Poimboeuf
2019-10-21 20:34 ` Josh Poimboeuf
2019-10-21 20:33 ` Pawan Gupta
2019-10-21 23:01 ` Andrew Cooper
2019-10-21 23:37 ` Luck, Tony
2019-10-21 23:39 ` Andrew Cooper
2019-10-14 21:05 ` [MODERATED] Re: ***UNCHECKED*** " Michal Hocko
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