* [PATCH v3 2/2] retpolines: Remove the minimal stuff of retpoline support
@ 2018-11-02 8:45 Zhenzhong Duan
2018-11-06 20:49 ` [tip:x86/pti] x86/retpoline: Remove minimal " tip-bot for Zhenzhong Duan
2018-11-28 14:19 ` tip-bot for Zhenzhong Duan
0 siblings, 2 replies; 3+ messages in thread
From: Zhenzhong Duan @ 2018-11-02 8:45 UTC (permalink / raw)
To: linux-kernel
Cc: mingo, konrad.wilk, dwmw, tglx, srinivas.eeda, bp, peterz, hpa
Now that CONFIG_RETPOLINE hard depends on compiler support, there is no
reason for minimal stuff to still exist.
[peterz@infradead.org: initial suggestion]
Link: Link: https://lore.kernel.org/lkml/caeb3213f13e57191e362ca04f2892cfa2ccda65.camel@infradead.org
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@oracle.com>
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Cc: David Woodhouse <dwmw@amazon.co.uk>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Borislav Petkov <bp@suse.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
arch/x86/include/asm/nospec-branch.h | 2 --
arch/x86/kernel/cpu/bugs.c | 13 ++-----------
2 files changed, 2 insertions(+), 13 deletions(-)
diff --git a/arch/x86/include/asm/nospec-branch.h b/arch/x86/include/asm/nospec-branch.h
index 8b09cbb..c202a64 100644
--- a/arch/x86/include/asm/nospec-branch.h
+++ b/arch/x86/include/asm/nospec-branch.h
@@ -221,8 +221,6 @@
/* The Spectre V2 mitigation variants */
enum spectre_v2_mitigation {
SPECTRE_V2_NONE,
- SPECTRE_V2_RETPOLINE_MINIMAL,
- SPECTRE_V2_RETPOLINE_MINIMAL_AMD,
SPECTRE_V2_RETPOLINE_GENERIC,
SPECTRE_V2_RETPOLINE_AMD,
SPECTRE_V2_IBRS_ENHANCED,
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index d0108fb..7f6d815 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -135,8 +135,6 @@ enum spectre_v2_mitigation_cmd {
static const char *spectre_v2_strings[] = {
[SPECTRE_V2_NONE] = "Vulnerable",
- [SPECTRE_V2_RETPOLINE_MINIMAL] = "Vulnerable: Minimal generic ASM retpoline",
- [SPECTRE_V2_RETPOLINE_MINIMAL_AMD] = "Vulnerable: Minimal AMD ASM retpoline",
[SPECTRE_V2_RETPOLINE_GENERIC] = "Mitigation: Full generic retpoline",
[SPECTRE_V2_RETPOLINE_AMD] = "Mitigation: Full AMD retpoline",
[SPECTRE_V2_IBRS_ENHANCED] = "Mitigation: Enhanced IBRS",
@@ -250,11 +248,6 @@ static void __init spec2_print_if_secure(const char *reason)
pr_info("%s selected on command line.\n", reason);
}
-static inline bool retp_compiler(void)
-{
- return __is_defined(CONFIG_RETPOLINE);
-}
-
static inline bool match_option(const char *arg, int arglen, const char *opt)
{
int len = strlen(opt);
@@ -417,14 +410,12 @@ static void __init spectre_v2_select_mitigation(void)
pr_err("Spectre mitigation: LFENCE not serializing, switching to generic retpoline\n");
goto retpoline_generic;
}
- mode = retp_compiler() ? SPECTRE_V2_RETPOLINE_AMD :
- SPECTRE_V2_RETPOLINE_MINIMAL_AMD;
+ mode = SPECTRE_V2_RETPOLINE_AMD;
setup_force_cpu_cap(X86_FEATURE_RETPOLINE_AMD);
setup_force_cpu_cap(X86_FEATURE_RETPOLINE);
} else {
retpoline_generic:
- mode = retp_compiler() ? SPECTRE_V2_RETPOLINE_GENERIC :
- SPECTRE_V2_RETPOLINE_MINIMAL;
+ mode = SPECTRE_V2_RETPOLINE_GENERIC;
setup_force_cpu_cap(X86_FEATURE_RETPOLINE);
}
--
1.8.3.1
^ permalink raw reply related [flat|nested] 3+ messages in thread* [tip:x86/pti] x86/retpoline: Remove minimal retpoline support
2018-11-02 8:45 [PATCH v3 2/2] retpolines: Remove the minimal stuff of retpoline support Zhenzhong Duan
@ 2018-11-06 20:49 ` tip-bot for Zhenzhong Duan
2018-11-28 14:19 ` tip-bot for Zhenzhong Duan
1 sibling, 0 replies; 3+ messages in thread
From: tip-bot for Zhenzhong Duan @ 2018-11-06 20:49 UTC (permalink / raw)
To: linux-tip-commits
Cc: mingo, dwmw, bp, peterz, hpa, tglx, linux-kernel, zhenzhong.duan,
konrad.wilk, srinivas.eeda
Commit-ID: aa0bb5a223720948bdd54d4c7bd48b147502e214
Gitweb: https://git.kernel.org/tip/aa0bb5a223720948bdd54d4c7bd48b147502e214
Author: Zhenzhong Duan <zhenzhong.duan@oracle.com>
AuthorDate: Fri, 2 Nov 2018 01:45:41 -0700
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitDate: Tue, 6 Nov 2018 21:46:20 +0100
x86/retpoline: Remove minimal retpoline support
Now that CONFIG_RETPOLINE hard depends on compiler support, there is no
reason to keep the minimal retpoline support around which only provided
basic protection in the assembly files.
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@oracle.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: David Woodhouse <dwmw@amazon.co.uk>
Cc: Borislav Petkov <bp@suse.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: <srinivas.eeda@oracle.com>
Link: https://lkml.kernel.org/r/f06f0a89-5587-45db-8ed2-0a9d6638d5c0@default
---
arch/x86/include/asm/nospec-branch.h | 2 --
arch/x86/kernel/cpu/bugs.c | 13 ++-----------
2 files changed, 2 insertions(+), 13 deletions(-)
diff --git a/arch/x86/include/asm/nospec-branch.h b/arch/x86/include/asm/nospec-branch.h
index 8b09cbb2d52c..c202a64edd95 100644
--- a/arch/x86/include/asm/nospec-branch.h
+++ b/arch/x86/include/asm/nospec-branch.h
@@ -221,8 +221,6 @@
/* The Spectre V2 mitigation variants */
enum spectre_v2_mitigation {
SPECTRE_V2_NONE,
- SPECTRE_V2_RETPOLINE_MINIMAL,
- SPECTRE_V2_RETPOLINE_MINIMAL_AMD,
SPECTRE_V2_RETPOLINE_GENERIC,
SPECTRE_V2_RETPOLINE_AMD,
SPECTRE_V2_IBRS_ENHANCED,
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index d0108fb6e4dd..7f6d8159398e 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -135,8 +135,6 @@ enum spectre_v2_mitigation_cmd {
static const char *spectre_v2_strings[] = {
[SPECTRE_V2_NONE] = "Vulnerable",
- [SPECTRE_V2_RETPOLINE_MINIMAL] = "Vulnerable: Minimal generic ASM retpoline",
- [SPECTRE_V2_RETPOLINE_MINIMAL_AMD] = "Vulnerable: Minimal AMD ASM retpoline",
[SPECTRE_V2_RETPOLINE_GENERIC] = "Mitigation: Full generic retpoline",
[SPECTRE_V2_RETPOLINE_AMD] = "Mitigation: Full AMD retpoline",
[SPECTRE_V2_IBRS_ENHANCED] = "Mitigation: Enhanced IBRS",
@@ -250,11 +248,6 @@ static void __init spec2_print_if_secure(const char *reason)
pr_info("%s selected on command line.\n", reason);
}
-static inline bool retp_compiler(void)
-{
- return __is_defined(CONFIG_RETPOLINE);
-}
-
static inline bool match_option(const char *arg, int arglen, const char *opt)
{
int len = strlen(opt);
@@ -417,14 +410,12 @@ retpoline_auto:
pr_err("Spectre mitigation: LFENCE not serializing, switching to generic retpoline\n");
goto retpoline_generic;
}
- mode = retp_compiler() ? SPECTRE_V2_RETPOLINE_AMD :
- SPECTRE_V2_RETPOLINE_MINIMAL_AMD;
+ mode = SPECTRE_V2_RETPOLINE_AMD;
setup_force_cpu_cap(X86_FEATURE_RETPOLINE_AMD);
setup_force_cpu_cap(X86_FEATURE_RETPOLINE);
} else {
retpoline_generic:
- mode = retp_compiler() ? SPECTRE_V2_RETPOLINE_GENERIC :
- SPECTRE_V2_RETPOLINE_MINIMAL;
+ mode = SPECTRE_V2_RETPOLINE_GENERIC;
setup_force_cpu_cap(X86_FEATURE_RETPOLINE);
}
^ permalink raw reply related [flat|nested] 3+ messages in thread* [tip:x86/pti] x86/retpoline: Remove minimal retpoline support
2018-11-02 8:45 [PATCH v3 2/2] retpolines: Remove the minimal stuff of retpoline support Zhenzhong Duan
2018-11-06 20:49 ` [tip:x86/pti] x86/retpoline: Remove minimal " tip-bot for Zhenzhong Duan
@ 2018-11-28 14:19 ` tip-bot for Zhenzhong Duan
1 sibling, 0 replies; 3+ messages in thread
From: tip-bot for Zhenzhong Duan @ 2018-11-28 14:19 UTC (permalink / raw)
To: linux-tip-commits
Cc: zhenzhong.duan, konrad.wilk, dwmw, linux-kernel, peterz, mingo,
tglx, bp, hpa, srinivas.eeda
Commit-ID: ef014aae8f1cd2793e4e014bbb102bed53f852b7
Gitweb: https://git.kernel.org/tip/ef014aae8f1cd2793e4e014bbb102bed53f852b7
Author: Zhenzhong Duan <zhenzhong.duan@oracle.com>
AuthorDate: Fri, 2 Nov 2018 01:45:41 -0700
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitDate: Wed, 28 Nov 2018 11:57:03 +0100
x86/retpoline: Remove minimal retpoline support
Now that CONFIG_RETPOLINE hard depends on compiler support, there is no
reason to keep the minimal retpoline support around which only provided
basic protection in the assembly files.
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@oracle.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: David Woodhouse <dwmw@amazon.co.uk>
Cc: Borislav Petkov <bp@suse.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: <srinivas.eeda@oracle.com>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/f06f0a89-5587-45db-8ed2-0a9d6638d5c0@default
---
arch/x86/include/asm/nospec-branch.h | 2 --
arch/x86/kernel/cpu/bugs.c | 13 ++-----------
2 files changed, 2 insertions(+), 13 deletions(-)
diff --git a/arch/x86/include/asm/nospec-branch.h b/arch/x86/include/asm/nospec-branch.h
index 8b09cbb2d52c..c202a64edd95 100644
--- a/arch/x86/include/asm/nospec-branch.h
+++ b/arch/x86/include/asm/nospec-branch.h
@@ -221,8 +221,6 @@
/* The Spectre V2 mitigation variants */
enum spectre_v2_mitigation {
SPECTRE_V2_NONE,
- SPECTRE_V2_RETPOLINE_MINIMAL,
- SPECTRE_V2_RETPOLINE_MINIMAL_AMD,
SPECTRE_V2_RETPOLINE_GENERIC,
SPECTRE_V2_RETPOLINE_AMD,
SPECTRE_V2_IBRS_ENHANCED,
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index d0108fb6e4dd..7f6d8159398e 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -135,8 +135,6 @@ enum spectre_v2_mitigation_cmd {
static const char *spectre_v2_strings[] = {
[SPECTRE_V2_NONE] = "Vulnerable",
- [SPECTRE_V2_RETPOLINE_MINIMAL] = "Vulnerable: Minimal generic ASM retpoline",
- [SPECTRE_V2_RETPOLINE_MINIMAL_AMD] = "Vulnerable: Minimal AMD ASM retpoline",
[SPECTRE_V2_RETPOLINE_GENERIC] = "Mitigation: Full generic retpoline",
[SPECTRE_V2_RETPOLINE_AMD] = "Mitigation: Full AMD retpoline",
[SPECTRE_V2_IBRS_ENHANCED] = "Mitigation: Enhanced IBRS",
@@ -250,11 +248,6 @@ static void __init spec2_print_if_secure(const char *reason)
pr_info("%s selected on command line.\n", reason);
}
-static inline bool retp_compiler(void)
-{
- return __is_defined(CONFIG_RETPOLINE);
-}
-
static inline bool match_option(const char *arg, int arglen, const char *opt)
{
int len = strlen(opt);
@@ -417,14 +410,12 @@ retpoline_auto:
pr_err("Spectre mitigation: LFENCE not serializing, switching to generic retpoline\n");
goto retpoline_generic;
}
- mode = retp_compiler() ? SPECTRE_V2_RETPOLINE_AMD :
- SPECTRE_V2_RETPOLINE_MINIMAL_AMD;
+ mode = SPECTRE_V2_RETPOLINE_AMD;
setup_force_cpu_cap(X86_FEATURE_RETPOLINE_AMD);
setup_force_cpu_cap(X86_FEATURE_RETPOLINE);
} else {
retpoline_generic:
- mode = retp_compiler() ? SPECTRE_V2_RETPOLINE_GENERIC :
- SPECTRE_V2_RETPOLINE_MINIMAL;
+ mode = SPECTRE_V2_RETPOLINE_GENERIC;
setup_force_cpu_cap(X86_FEATURE_RETPOLINE);
}
^ permalink raw reply related [flat|nested] 3+ messages in thread
end of thread, other threads:[~2018-11-28 14:20 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz follow: Atom feed
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2018-11-02 8:45 [PATCH v3 2/2] retpolines: Remove the minimal stuff of retpoline support Zhenzhong Duan
2018-11-06 20:49 ` [tip:x86/pti] x86/retpoline: Remove minimal " tip-bot for Zhenzhong Duan
2018-11-28 14:19 ` tip-bot for Zhenzhong Duan
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