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| author | Thomas Gleixner <tglx@linutronix.de> | 2020-05-21 23:05:30 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-06-11 16:15:10 +0300 |
| commit | e88d974136dbb5d6962eeb63075900603e737a1e (patch) | |
| tree | 79355ad40ad7ff199bd230780a17b493d3d940fd /arch/x86/entry/entry_32.S | |
| parent | e2dcb5f1390715244aec12dbd6f294863ca37b88 (diff) | |
| download | linux-e88d974136dbb5d6962eeb63075900603e737a1e.tar.xz | |
x86/entry: Change exit path of xen_failsafe_callback
xen_failsafe_callback() is invoked from XEN for two cases:
1. Fault while reloading DS, ES, FS or GS
2. Fault while executing IRET
#1 retries the IRET after XEN has fixed up the segments.
#2 injects a #GP which kills the task
For #1 there is no reason to go through the full exception return path
because the tasks TIF state is still the same. So just going straight to
the IRET path is good enough.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Andy Lutomirski <luto@kernel.org>
Link: https://lore.kernel.org/r/20200521202118.423224507@linutronix.de
Diffstat (limited to 'arch/x86/entry/entry_32.S')
| -rw-r--r-- | arch/x86/entry/entry_32.S | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S index 6c6ae3a8c1fc..6fcdee9feba0 100644 --- a/arch/x86/entry/entry_32.S +++ b/arch/x86/entry/entry_32.S @@ -1355,7 +1355,7 @@ SYM_FUNC_START(xen_failsafe_callback) 5: pushl $-1 /* orig_ax = -1 => not a system call */ SAVE_ALL ENCODE_FRAME_POINTER - jmp ret_from_exception + jmp handle_exception_return .section .fixup, "ax" 6: xorl %eax, %eax |