1 files changed, 13 insertions, 18 deletions

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 7e8d3bc80af6..e3c6a06cf725 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -238,6 +238,7 @@ static void xen_cpuid(unsigned int *ax, unsigned int *bx,
 static __init void xen_init_cpuid_mask(void)
 {
         unsigned int ax, bx, cx, dx;
+        unsigned int xsave_mask;
 
         cpuid_leaf1_edx_mask =
                 ~((1 << X86_FEATURE_MCE)  |  /* disable MCE */
@@ -249,24 +250,16 @@ static __init void xen_init_cpuid_mask(void)
                 cpuid_leaf1_edx_mask &=
                         ~((1 << X86_FEATURE_APIC) |  /* disable local APIC */
                           (1 << X86_FEATURE_ACPI));  /* disable ACPI */
-
         ax = 1;
-        cx = 0;
         xen_cpuid(&ax, &bx, &cx, &dx);
 
-        /* cpuid claims we support xsave; try enabling it to see what happens */
-        if (cx & (1 << (X86_FEATURE_XSAVE % 32))) {
-                unsigned long cr4;
-
-                set_in_cr4(X86_CR4_OSXSAVE);
-                
-                cr4 = read_cr4();
-
-                if ((cr4 & X86_CR4_OSXSAVE) == 0)
-                        cpuid_leaf1_ecx_mask &= ~(1 << (X86_FEATURE_XSAVE % 32));
+        xsave_mask =
+                (1 << (X86_FEATURE_XSAVE % 32)) |
+                (1 << (X86_FEATURE_OSXSAVE % 32));
 
-                clear_in_cr4(X86_CR4_OSXSAVE);
-        }
+        /* Xen will set CR4.OSXSAVE if supported and not disabled by force */
+        if ((cx & xsave_mask) != xsave_mask)
+                cpuid_leaf1_ecx_mask &= ~xsave_mask; /* disable XSAVE & OSXSAVE */
 }
 
 static void xen_set_debugreg(int reg, unsigned long val)
@@ -1194,7 +1187,7 @@ asmlinkage void __init xen_start_kernel(void)
         per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0];
 
         local_irq_disable();
-        early_boot_irqs_off();
+        early_boot_irqs_disabled = true;
 
         memblock_init();
 
@@ -1284,15 +1277,14 @@ static int init_hvm_pv_info(int *major, int *minor)
 
         xen_setup_features();
 
-        pv_info = xen_info;
-        pv_info.kernel_rpl = 0;
+        pv_info.name = "Xen HVM";
 
         xen_domain_type = XEN_HVM_DOMAIN;
 
         return 0;
 }
 
-void xen_hvm_init_shared_info(void)
+void __ref xen_hvm_init_shared_info(void)
 {
         int cpu;
         struct xen_add_to_physmap xatp;
@@ -1331,6 +1323,8 @@ static int __cpuinit xen_hvm_cpu_notify(struct notifier_block *self,
         switch (action) {
         case CPU_UP_PREPARE:
                 per_cpu(xen_vcpu, cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu];
+                if (xen_have_vector_callback)
+                        xen_init_lock_cpu(cpu);
                 break;
         default:
                 break;
@@ -1355,6 +1349,7 @@ static void __init xen_hvm_guest_init(void)
 
         if (xen_feature(XENFEAT_hvm_callback_vector))
                 xen_have_vector_callback = 1;
+        xen_hvm_smp_init();
         register_cpu_notifier(&xen_hvm_cpu_notifier);
         xen_unplug_emulated_devices();
         have_vcpu_info_placement = 0;