From: Avi Kivity <[email protected]>

Currently sharing space with the stack.

Signed-off-by: Avi Kivity <[email protected]>

diff --git a/kvm/user/test/x86/cstart64.S b/kvm/user/test/x86/cstart64.S
index e5554ba..f1a9d09 100644
--- a/kvm/user/test/x86/cstart64.S
+++ b/kvm/user/test/x86/cstart64.S
@@ -80,9 +80,19 @@ mb_flags = 0x0
        # multiboot header
        .long mb_magic, mb_flags, 0 - (mb_magic + mb_flags)
 
+MSR_GS_BASE = 0xc0000101
+
+.macro setup_percpu_area
+       lea -4096(%esp), %eax
+       mov $0, %edx
+       mov $MSR_GS_BASE, %ecx
+       wrmsr
+.endm
+
 .globl start
 start:
        mov $stacktop, %esp
+       setup_percpu_area
        call prepare_64
        jmpl $8, $start64
 
@@ -142,6 +152,7 @@ ap_start32:
        mov %ax, %ss
        mov $-4096, %esp
        lock/xaddl %esp, smp_stacktop
+       setup_percpu_area
        call prepare_64
        ljmpl $8, $ap_start64
 
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