always clear the X2APIC_ENABLE bit for PV guest

Commit e657fcc clears cpu capability bit instead of using fake cpuid
value, the EXTD should always be off for PV guest without depending
on cpuid value. So remove the cpuid check in xen_read_msr_safe() to
always clear the X2APIC_ENABLE bit.

Signed-off-by: Talons Lee <xin.li@citrix.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>

diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
index 2f6787fc710660aae1598c8e245d04101f77cb18..c54a493e139a78e37eab27cc36556396303a390e 100644 (file)
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -898,10 +898,7 @@ static u64 xen_read_msr_safe(unsigned int msr, int *err)
        val = native_read_msr_safe(msr, err);
        switch (msr) {
        case MSR_IA32_APICBASE:
-#ifdef CONFIG_X86_X2APIC
-               if (!(cpuid_ecx(1) & (1 << (X86_FEATURE_X2APIC & 31))))
-#endif
-                       val &= ~X2APIC_ENABLE;
+               val &= ~X2APIC_ENABLE;
                break;
        }
        return val;