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| author | Andy Lutomirski <luto@kernel.org> | 2017-11-02 08:59:09 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-11-02 11:04:43 +0100 |
| commit | bd7dc5a6afac719d8ce4092391eef2c7e83c2a75 (patch) | |
| tree | 2ee8471b8b2443be14f0badffe69befd7a76f8d2 /arch/x86/kernel/process_64.c | |
| parent | x86/entry/64: De-Xen-ify our NMI code (diff) | |
| download | linux-bd7dc5a6afac719d8ce4092391eef2c7e83c2a75.tar.xz linux-bd7dc5a6afac719d8ce4092391eef2c7e83c2a75.zip | |
x86/entry/32: Pull the MSR_IA32_SYSENTER_CS update code out of native_load_sp0()
This causes the MSR_IA32_SYSENTER_CS write to move out of the
paravirt callback. This shouldn't affect Xen PV: Xen already ignores
MSR_IA32_SYSENTER_ESP writes. In any event, Xen doesn't support
vm86() in a useful way.
Note to any potential backporters: This patch won't break lguest, as
lguest didn't have any SYSENTER support at all.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bpetkov@suse.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/75cf09fe03ae778532d0ca6c65aa58e66bc2f90c.1509609304.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/process_64.c')
| -rw-r--r-- | arch/x86/kernel/process_64.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index 302e7b2572d1..a6ff6d1a0110 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -464,7 +464,7 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p) */ this_cpu_write(current_task, next_p); - /* Reload esp0 and ss1. This changes current_thread_info(). */ + /* Reload sp0. */ load_sp0(tss, next); /* |