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Message-ID: <166799750447.4906.6850685710564265854.tip-bot2@tip-bot2>
Date: Wed, 09 Nov 2022 12:38:24 -0000
From: "tip-bot2 for Andrew Cooper" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Andrew Cooper <andrew.cooper3@...rix.com>,
Borislav Petkov <bp@...e.de>, <stable@...r.kernel.org>,
x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: x86/fpu] x86/fpu/xstate: Fix XSTATE_WARN_ON() to emit relevant
diagnostics
The following commit has been merged into the x86/fpu branch of tip:
Commit-ID: 48280042f2c6e3ac2cfb1d8b752ab4a7e0baea24
Gitweb: https://git.kernel.org/tip/48280042f2c6e3ac2cfb1d8b752ab4a7e0baea24
Author: Andrew Cooper <andrew.cooper3@...rix.com>
AuthorDate: Wed, 10 Aug 2022 23:19:09 +01:00
Committer: Borislav Petkov <bp@...e.de>
CommitterDate: Wed, 09 Nov 2022 13:28:31 +01:00
x86/fpu/xstate: Fix XSTATE_WARN_ON() to emit relevant diagnostics
"XSAVE consistency problem" has been reported under Xen, but that's the extent
of my divination skills.
Modify XSTATE_WARN_ON() to force the caller to provide relevant diagnostic
information, and modify each caller suitably.
For check_xstate_against_struct(), this removes a double WARN() where one will
do perfectly fine.
CC stable as this has been wonky debugging for 7 years and it is good to
have there too.
Signed-off-by: Andrew Cooper <andrew.cooper3@...rix.com>
Signed-off-by: Borislav Petkov <bp@...e.de>
Cc: <stable@...r.kernel.org>
Link: https://lore.kernel.org/r/20220810221909.12768-1-andrew.cooper3@citrix.com
---
arch/x86/kernel/fpu/xstate.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index 59e543b..c2dde46 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -440,8 +440,8 @@ static void __init __xstate_dump_leaves(void)
}
}
-#define XSTATE_WARN_ON(x) do { \
- if (WARN_ONCE(x, "XSAVE consistency problem, dumping leaves")) { \
+#define XSTATE_WARN_ON(x, fmt, ...) do { \
+ if (WARN_ONCE(x, "XSAVE consistency problem: " fmt, ##__VA_ARGS__)) { \
__xstate_dump_leaves(); \
} \
} while (0)
@@ -554,8 +554,7 @@ static bool __init check_xstate_against_struct(int nr)
(nr >= XFEATURE_MAX) ||
(nr == XFEATURE_PT_UNIMPLEMENTED_SO_FAR) ||
((nr >= XFEATURE_RSRVD_COMP_11) && (nr <= XFEATURE_RSRVD_COMP_16))) {
- WARN_ONCE(1, "no structure for xstate: %d\n", nr);
- XSTATE_WARN_ON(1);
+ XSTATE_WARN_ON(1, "No structure for xstate: %d\n", nr);
return false;
}
return true;
@@ -598,12 +597,13 @@ static bool __init paranoid_xstate_size_valid(unsigned int kernel_size)
* XSAVES.
*/
if (!xsaves && xfeature_is_supervisor(i)) {
- XSTATE_WARN_ON(1);
+ XSTATE_WARN_ON(1, "Got supervisor feature %d, but XSAVES not advertised\n", i);
return false;
}
}
size = xstate_calculate_size(fpu_kernel_cfg.max_features, compacted);
- XSTATE_WARN_ON(size != kernel_size);
+ XSTATE_WARN_ON(size != kernel_size,
+ "size %u != kernel_size %u\n", size, kernel_size);
return size == kernel_size;
}
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