[ Upstream commit 896c80bef4d3b357814a476663158aaf669d0fb3 ] x86_64 restores system call MSRs in fix_processor_context(), and x86_32 restored them along with segment registers. The 64-bit variant makes more sense, so move the 32-bit code to match the 64-bit code.
No side effects are expected to runtime behavior. Tested-by: Jarkko Nikula <jarkko.nik...@linux.intel.com> Signed-off-by: Andy Lutomirski <l...@kernel.org> Acked-by: Rafael J. Wysocki <rafael.j.wyso...@intel.com> Acked-by: Thomas Gleixner <t...@linutronix.de> Cc: Borislav Petkov <bpet...@suse.de> Cc: Josh Poimboeuf <jpoim...@redhat.com> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: Pavel Machek <pa...@ucw.cz> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Rafael J. Wysocki <r...@rjwysocki.net> Cc: Zhang Rui <rui.zh...@intel.com> Link: http://lkml.kernel.org/r/65158f8d7ee64dd6bbc6c1c83b3b34aaa854e3ae.1513286253.git.l...@kernel.org Signed-off-by: Ingo Molnar <mi...@kernel.org> Signed-off-by: Sasha Levin <sas...@kernel.org> --- arch/x86/power/cpu.c | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-) diff --git a/arch/x86/power/cpu.c b/arch/x86/power/cpu.c index cba2e2c3f89e..8e1668470b23 100644 --- a/arch/x86/power/cpu.c +++ b/arch/x86/power/cpu.c @@ -176,6 +176,9 @@ static void fix_processor_context(void) write_gdt_entry(desc, GDT_ENTRY_TSS, &tss, DESC_TSS); syscall_init(); /* This sets MSR_*STAR and related */ +#else + if (boot_cpu_has(X86_FEATURE_SEP)) + enable_sep_cpu(); #endif load_TR_desc(); /* This does ltr */ load_mm_ldt(current->active_mm); /* This does lldt */ @@ -239,12 +242,6 @@ static void notrace __restore_processor_state(struct saved_context *ctxt) loadsegment(fs, ctxt->fs); loadsegment(gs, ctxt->gs); loadsegment(ss, ctxt->ss); - - /* - * sysenter MSRs - */ - if (boot_cpu_has(X86_FEATURE_SEP)) - enable_sep_cpu(); #else /* CONFIG_X86_64 */ asm volatile ("movw %0, %%ds" :: "r" (ctxt->ds)); -- 2.19.1
