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Date: Tue, 5 May 2015 18:24:58 +0200
From: Ingo Molnar <mingo@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: Andy Lutomirski <luto@...capital.net>,
Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>,
Fenghua Yu <fenghua.yu@...el.com>,
"H. Peter Anvin" <hpa@...or.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Oleg Nesterov <oleg@...hat.com>,
Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH 078/208] 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@...en8.de>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: Fenghua Yu <fenghua.yu@...el.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
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 bfe92f73bf86..f39882b7281b 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 =
--
2.1.0
--
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