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| author | Andrew Cooper <andrew.cooper3@citrix.com> | 2022-08-11 01:19:09 +0300 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2022-11-09 15:28:31 +0300 |
| commit | 48280042f2c6e3ac2cfb1d8b752ab4a7e0baea24 (patch) | |
| tree | b1e33fc81bb26327c0f5eedf485db68cb5012164 /arch/x86/kernel/fpu | |
| parent | f0c4d9fc9cc9462659728d168387191387e903cc (diff) | |
| download | linux-48280042f2c6e3ac2cfb1d8b752ab4a7e0baea24.tar.xz | |
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@citrix.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20220810221909.12768-1-andrew.cooper3@citrix.com
Diffstat (limited to 'arch/x86/kernel/fpu')
| -rw-r--r-- | arch/x86/kernel/fpu/xstate.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c index 59e543b95a3c..c2dde46a538e 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; } |