diff options
author | Thomas Gleixner <tglx@linutronix.de> | 2020-06-12 14:02:27 +0200 |
---|---|---|
committer | Thomas Gleixner <tglx@linutronix.de> | 2020-06-12 14:15:48 +0200 |
commit | 71ed49d8fb33023f242419a77ecb1141c029cac4 (patch) | |
tree | a743da99e822b09ab03ba67561603c1077fac484 /arch/x86/include/asm/idtentry.h | |
parent | 15a416e8aaa758b5534f64a3972dae05275bc225 (diff) | |
download | linux-71ed49d8fb33023f242419a77ecb1141c029cac4.tar.bz2 |
x86/entry: Make NMI use IDTENTRY_RAW
For no reason other than beginning brainmelt, IDTENTRY_NMI was mapped to
IDTENTRY_IST.
This is not a problem on 64bit because the IST default entry point maps to
IDTENTRY_RAW which does not any entry handling. The surplus function
declaration for the noist C entry point is unused and as there is no ASM
code emitted for NMI this went unnoticed.
On 32bit IDTENTRY_IST maps to a regular IDTENTRY which does the normal
entry handling. That is clearly the wrong thing to do for NMI.
Map it to IDTENTRY_RAW to unbreak it. The IDTENTRY_NMI mapping needs to
stay to avoid emitting ASM code.
Fixes: 6271fef00b34 ("x86/entry: Convert NMI to IDTENTRY_NMI")
Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Debugged-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/CA+G9fYvF3cyrY+-iw_SZtpN-i2qA2BruHg4M=QYECU2-dNdsMw@mail.gmail.com
Diffstat (limited to 'arch/x86/include/asm/idtentry.h')
-rw-r--r-- | arch/x86/include/asm/idtentry.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/include/asm/idtentry.h b/arch/x86/include/asm/idtentry.h index 2fc6b0c58341..cf51c50eb356 100644 --- a/arch/x86/include/asm/idtentry.h +++ b/arch/x86/include/asm/idtentry.h @@ -391,8 +391,8 @@ __visible noinstr void func(struct pt_regs *regs, \ #define DEFINE_IDTENTRY_MCE DEFINE_IDTENTRY_IST #define DEFINE_IDTENTRY_MCE_USER DEFINE_IDTENTRY_NOIST -#define DECLARE_IDTENTRY_NMI DECLARE_IDTENTRY_IST -#define DEFINE_IDTENTRY_NMI DEFINE_IDTENTRY_IST +#define DECLARE_IDTENTRY_NMI DECLARE_IDTENTRY_RAW +#define DEFINE_IDTENTRY_NMI DEFINE_IDTENTRY_RAW #define DECLARE_IDTENTRY_DEBUG DECLARE_IDTENTRY_IST #define DEFINE_IDTENTRY_DEBUG DEFINE_IDTENTRY_IST |