linux-kernel - [tip: x86/fpu] x86/fpu/xstate: Fix last_good_offset in setup_xstate

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Date:   Wed, 12 Feb 2020 14:50:50 -0000
From:   "tip-bot2 for Yu-cheng Yu" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     "Yu-cheng Yu" <yu-cheng.yu@...el.com>,
        Borislav Petkov <bp@...e.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        x86 <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: [tip: x86/fpu] x86/fpu/xstate: Fix last_good_offset in
 setup_xstate_features()

The following commit has been merged into the x86/fpu branch of tip:

Commit-ID:     c12e13dcd814023a903399ec5ac2e7082d664b8b
Gitweb:        https://git.kernel.org/tip/c12e13dcd814023a903399ec5ac2e7082d664b8b
Author:        Yu-cheng Yu <yu-cheng.yu@...el.com>
AuthorDate:    Thu, 09 Jan 2020 13:14:50 -08:00
Committer:     Borislav Petkov <bp@...e.de>
CommitterDate: Tue, 11 Feb 2020 19:54:04 +01:00

x86/fpu/xstate: Fix last_good_offset in setup_xstate_features()

The function setup_xstate_features() uses CPUID to find each xfeature's
standard-format offset and size.  Since XSAVES always uses the compacted
format, supervisor xstates are *NEVER* in the standard-format and their
offsets are left as -1's.  However, they are still being tracked as
last_good_offset.

Fix it by tracking only user xstate offsets.

 [ bp: Use xfeature_is_supervisor() and save an indentation level. Drop
   now unused xfeature_is_user(). ]

Signed-off-by: Yu-cheng Yu <yu-cheng.yu@...el.com>
Signed-off-by: Borislav Petkov <bp@...e.de>
Reviewed-by: Dave Hansen <dave.hansen@...ux.intel.com>
Link: https://lkml.kernel.org/r/20200109211452.27369-2-yu-cheng.yu@intel.com
---
 arch/x86/kernel/fpu/xstate.c | 27 +++++++++++++--------------
 1 file changed, 13 insertions(+), 14 deletions(-)

diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index a180659..fe67cab 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -120,11 +120,6 @@ static bool xfeature_is_supervisor(int xfeature_nr)
 	return ecx & 1;
 }
 
-static bool xfeature_is_user(int xfeature_nr)
-{
-	return !xfeature_is_supervisor(xfeature_nr);
-}
-
 /*
  * When executing XSAVEOPT (or other optimized XSAVE instructions), if
  * a processor implementation detects that an FPU state component is still
@@ -265,21 +260,25 @@ static void __init setup_xstate_features(void)
 
 		cpuid_count(XSTATE_CPUID, i, &eax, &ebx, &ecx, &edx);
 
+		xstate_sizes[i] = eax;
+
 		/*
-		 * If an xfeature is supervisor state, the offset
-		 * in EBX is invalid. We leave it to -1.
+		 * If an xfeature is supervisor state, the offset in EBX is
+		 * invalid, leave it to -1.
 		 */
-		if (xfeature_is_user(i))
-			xstate_offsets[i] = ebx;
+		if (xfeature_is_supervisor(i))
+			continue;
+
+		xstate_offsets[i] = ebx;
 
-		xstate_sizes[i] = eax;
 		/*
-		 * In our xstate size checks, we assume that the
-		 * highest-numbered xstate feature has the
-		 * highest offset in the buffer.  Ensure it does.
+		 * In our xstate size checks, we assume that the highest-numbered
+		 * xstate feature has the highest offset in the buffer.  Ensure
+		 * it does.
 		 */
 		WARN_ONCE(last_good_offset > xstate_offsets[i],
-			"x86/fpu: misordered xstate at %d\n", last_good_offset);
+			  "x86/fpu: misordered xstate at %d\n", last_good_offset);
+
 		last_good_offset = xstate_offsets[i];
 	}
 }