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From: "tip-bot2 for Yu-cheng Yu" <tip-bot2@linutronix.de>
To: linux-tip-commits@vger.kernel.org
Cc: "Yu-cheng Yu" <yu-cheng.yu@intel.com>,
	Borislav Petkov <bp@suse.de>,
	Dave Hansen <dave.hansen@linux.intel.com>, x86 <x86@kernel.org>,
	LKML <linux-kernel@vger.kernel.org>
Subject: [tip: x86/fpu] x86/fpu/xstate: Warn when checking alignment of disabled xfeatures
Date: Wed, 12 Feb 2020 14:50:49 -0000	[thread overview]
Message-ID: <158151904924.411.12474197700112093867.tip-bot2@tip-bot2> (raw)
In-Reply-To: <20200109211452.27369-4-yu-cheng.yu@intel.com>

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

Commit-ID:     e70b100806d63fb79775858ea92e1a716da46186
Gitweb:        https://git.kernel.org/tip/e70b100806d63fb79775858ea92e1a716da46186
Author:        Yu-cheng Yu <yu-cheng.yu@intel.com>
AuthorDate:    Thu, 09 Jan 2020 13:14:52 -08:00
Committer:     Borislav Petkov <bp@suse.de>
CommitterDate: Wed, 12 Feb 2020 15:43:34 +01:00

x86/fpu/xstate: Warn when checking alignment of disabled xfeatures

An XSAVES component's alignment/offset is meaningful only when the
feature is enabled. Return zero and WARN_ONCE on checking alignment of
disabled features.

Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Dave Hansen <dave.hansen@linux.intel.com>
Link: https://lkml.kernel.org/r/20200109211452.27369-4-yu-cheng.yu@intel.com
---
 arch/x86/kernel/fpu/xstate.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index edcaacd..73fe597 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -325,6 +325,13 @@ static int xfeature_is_aligned(int xfeature_nr)
 	u32 eax, ebx, ecx, edx;
 
 	CHECK_XFEATURE(xfeature_nr);
+
+	if (!xfeature_enabled(xfeature_nr)) {
+		WARN_ONCE(1, "Checking alignment of disabled xfeature %d\n",
+			  xfeature_nr);
+		return 0;
+	}
+
 	cpuid_count(XSTATE_CPUID, xfeature_nr, &eax, &ebx, &ecx, &edx);
 	/*
 	 * The value returned by ECX[1] indicates the alignment

      reply	other threads:[~2020-02-12 14:51 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-09 21:14 [PATCH 0/3] Fix two issues in XSAVES offset calculation Yu-cheng Yu
2020-01-09 21:14 ` [PATCH 1/3] x86/fpu/xstate: Fix last_good_offset in setup_xstate_features() Yu-cheng Yu
2020-02-11 18:56   ` Borislav Petkov
2020-02-12 14:50   ` [tip: x86/fpu] " tip-bot2 for Yu-cheng Yu
2020-01-09 21:14 ` [PATCH 2/3] x86/fpu/xstate: Fix XSAVES offsets in setup_xstate_comp() Yu-cheng Yu
2020-02-12 14:50   ` [tip: x86/fpu] " tip-bot2 for Yu-cheng Yu
2020-01-09 21:14 ` [PATCH 3/3] x86/fpu/xstate: WARN_ONCE on checking alignment of disabled xfeatures Yu-cheng Yu
2020-02-12 14:50   ` tip-bot2 for Yu-cheng Yu [this message]

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