Commit-ID: 69496e10f87cec182a9263046c1b251235b8c38e
Gitweb: http://git.kernel.org/tip/69496e10f87cec182a9263046c1b251235b8c38e
Author: Ingo Molnar <mingo@xxxxxxxxxx>
AuthorDate: Fri, 24 Apr 2015 08:48:01 +0200
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Tue, 19 May 2015 15:47:32 +0200
x86/fpu: Print supported xstate features in human readable way
Inform the user/admin about which xstate features the kernel supports.
Reviewed-by: Borislav Petkov <bp@xxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
arch/x86/kernel/fpu/xsave.c | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/arch/x86/kernel/fpu/xsave.c b/arch/x86/kernel/fpu/xsave.c
index bfe92f7..f39882b 100644
--- a/arch/x86/kernel/fpu/xsave.c
+++ b/arch/x86/kernel/fpu/xsave.c
@@ -482,6 +482,30 @@ static void __init setup_xstate_features(void)
} while (1);
}
+static void print_xstate_feature(u64 xstate_mask, const char *desc)
+{
+ if (pcntxt_mask & xstate_mask) {
+ int xstate_feature = fls64(xstate_mask)-1;
+
+ pr_info("x86/fpu: Supporting XSAVE feature %2d: '%s'\n", xstate_feature, desc);
+ }
+}
+
+/*
+ * Print out all the supported xstate features:
+ */
+static void print_xstate_features(void)
+{
+ print_xstate_feature(XSTATE_FP, "x87 floating point registers");
+ print_xstate_feature(XSTATE_SSE, "SSE registers");
+ print_xstate_feature(XSTATE_YMM, "AVX registers");
+ print_xstate_feature(XSTATE_BNDREGS, "MPX bounds registers");
+ print_xstate_feature(XSTATE_BNDCSR, "MPX CSR");
+ print_xstate_feature(XSTATE_OPMASK, "AVX-512 opmask");
+ print_xstate_feature(XSTATE_ZMM_Hi256, "AVX-512 Hi256");
+ print_xstate_feature(XSTATE_Hi16_ZMM, "AVX-512 ZMM_Hi256");
+}
+
/*
* This function sets up offsets and sizes of all extended states in
* xsave area. This supports both standard format and compacted format
@@ -545,6 +569,7 @@ static void __init setup_init_fpu_buf(void)
return;
setup_xstate_features();
+ print_xstate_features();
if (cpu_has_xsaves) {
init_xstate_buf->xsave_hdr.xcomp_bv =
--
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