From: Wei Liu <wei.liu2@citrix.com>
Date: Fri, 19 Oct 2018 14:28:36 +0000 (+0100)
Subject: x86: don't setup legacy syscall vector when !CONFIG_PV
X-Git-Tag: archive/raspbian/4.14.0+80-gd101b417b7-1+rpi1^2~63^2~3117
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=3528426cb93948e440da947963bd8163f186ef67;p=xen.git

x86: don't setup legacy syscall vector when !CONFIG_PV

The code snippet is to switch between SYS_DECS_trap_gate and
SYS_DESC_irq_gate depending on whether XPTI is used. When PV is
disabled there is no need to switch.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
---

diff --git a/xen/arch/x86/smpboot.c b/xen/arch/x86/smpboot.c
index 35abfc4ea4..43deb82e53 100644
--- a/xen/arch/x86/smpboot.c
+++ b/xen/arch/x86/smpboot.c
@@ -1094,12 +1094,14 @@ void __init smp_prepare_cpus(void)
     {
         get_cpu_info()->pv_cr3 = 0;
 
+#ifdef CONFIG_PV
         /*
          * All entry points which may need to switch page tables have to start
          * with interrupts off. Re-write what pv_trap_init() has put there.
          */
         _set_gate(idt_table + LEGACY_SYSCALL_VECTOR, SYS_DESC_irq_gate, 3,
                   &int80_direct_trap);
+#endif
     }
 
     set_nr_sockets();