* Re: [RFC PATCH 1/7] x86/cpufeatures: add X86_FEATURE_SCI
@ 2020-06-30 0:08 hackapple
2020-06-30 11:58 ` Mike Rapoport
0 siblings, 1 reply; 3+ messages in thread
From: hackapple @ 2020-06-30 0:08 UTC (permalink / raw)
To: rppt
Cc: James.Bottomley, alexandre.chartre, bp, dave.hansen, hpa,
jwadams, keescook, linux-kernel, linux-mm, linux-security-module,
luto, mingo, peterz, pjt, tglx, x86
What’s the version of kernel?
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [RFC PATCH 1/7] x86/cpufeatures: add X86_FEATURE_SCI
2020-06-30 0:08 [RFC PATCH 1/7] x86/cpufeatures: add X86_FEATURE_SCI hackapple
@ 2020-06-30 11:58 ` Mike Rapoport
0 siblings, 0 replies; 3+ messages in thread
From: Mike Rapoport @ 2020-06-30 11:58 UTC (permalink / raw)
To: hackapple
Cc: James.Bottomley, alexandre.chartre, bp, dave.hansen, hpa,
jwadams, keescook, linux-kernel, linux-mm, linux-security-module,
luto, mingo, peterz, pjt, tglx, x86
On Tue, Jun 30, 2020 at 08:08:59AM +0800, hackapple wrote:
> What’s the version of kernel?
It was around 5.2 time frame, I think.
--
Sincerely yours,
Mike.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [RFC PATCH 1/7] x86/cpufeatures: add X86_FEATURE_SCI
2019-04-25 21:45 [RFC PATCH 0/7] x86: introduce system calls addess space isolation Mike Rapoport
@ 2019-04-25 21:45 ` Mike Rapoport
0 siblings, 0 replies; 3+ messages in thread
From: Mike Rapoport @ 2019-04-25 21:45 UTC (permalink / raw)
To: linux-kernel
Cc: Alexandre Chartre, Andy Lutomirski, Borislav Petkov, Dave Hansen,
H. Peter Anvin, Ingo Molnar, James Bottomley, Jonathan Adams,
Kees Cook, Paul Turner, Peter Zijlstra, Thomas Gleixner,
linux-mm, linux-security-module, x86, Mike Rapoport
The X86_FEATURE_SCI will be set when system call isolation is enabled.
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
---
arch/x86/include/asm/cpufeatures.h | 1 +
arch/x86/include/asm/disabled-features.h | 8 +++++++-
2 files changed, 8 insertions(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index 6d61225..a01c6dd 100644
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -221,6 +221,7 @@
#define X86_FEATURE_ZEN ( 7*32+28) /* "" CPU is AMD family 0x17 (Zen) */
#define X86_FEATURE_L1TF_PTEINV ( 7*32+29) /* "" L1TF workaround PTE inversion */
#define X86_FEATURE_IBRS_ENHANCED ( 7*32+30) /* Enhanced IBRS */
+#define X86_FEATURE_SCI ( 7*32+31) /* "" System call isolation */
/* Virtualization flags: Linux defined, word 8 */
#define X86_FEATURE_TPR_SHADOW ( 8*32+ 0) /* Intel TPR Shadow */
diff --git a/arch/x86/include/asm/disabled-features.h b/arch/x86/include/asm/disabled-features.h
index a5ea841..79947f0 100644
--- a/arch/x86/include/asm/disabled-features.h
+++ b/arch/x86/include/asm/disabled-features.h
@@ -62,6 +62,12 @@
# define DISABLE_PTI (1 << (X86_FEATURE_PTI & 31))
#endif
+#ifdef CONFIG_SYSCALL_ISOLATION
+# define DISABLE_SCI 0
+#else
+# define DISABLE_SCI (1 << (X86_FEATURE_SCI & 31))
+#endif
+
/*
* Make sure to add features to the correct mask
*/
@@ -72,7 +78,7 @@
#define DISABLED_MASK4 (DISABLE_PCID)
#define DISABLED_MASK5 0
#define DISABLED_MASK6 0
-#define DISABLED_MASK7 (DISABLE_PTI)
+#define DISABLED_MASK7 (DISABLE_PTI|DISABLE_SCI)
#define DISABLED_MASK8 0
#define DISABLED_MASK9 (DISABLE_MPX|DISABLE_SMAP)
#define DISABLED_MASK10 0
--
2.7.4
^ permalink raw reply related [flat|nested] 3+ messages in thread
end of thread, other threads:[~2020-06-30 12:02 UTC | newest]
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2019-04-25 21:45 [RFC PATCH 0/7] x86: introduce system calls addess space isolation Mike Rapoport
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