2 files changed, 20 insertions, 2 deletions

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index bd8b8459c3d0..5240f563076d 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1070,6 +1070,23 @@ static inline void xen_write_cr8(unsigned long val)
         BUG_ON(val);
 }
 #endif
+
+static u64 xen_read_msr_safe(unsigned int msr, int *err)
+{
+        u64 val;
+
+        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;
+                break;
+        }
+        return val;
+}
+
 static int xen_write_msr_safe(unsigned int msr, unsigned low, unsigned high)
 {
         int ret;
@@ -1240,7 +1257,7 @@ static const struct pv_cpu_ops xen_cpu_ops __initconst = {
 
         .wbinvd = native_wbinvd,
 
-        .read_msr = native_read_msr_safe,
+        .read_msr = xen_read_msr_safe,
         .write_msr = xen_write_msr_safe,
 
         .read_tsc = native_read_tsc,
@@ -1741,6 +1758,7 @@ asmlinkage __visible void __init xen_start_kernel(void)
 #ifdef CONFIG_X86_32
         i386_start_kernel();
 #else
+        cr4_init_shadow(); /* 32b kernel does this in i386_start_kernel() */
         x86_64_start_reservations((char *)__pa_symbol(&boot_params));
 #endif
 }
diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c
index 740ae3026a14..9f93af56a5fc 100644
--- a/arch/x86/xen/p2m.c
+++ b/arch/x86/xen/p2m.c
@@ -563,7 +563,7 @@ static bool alloc_p2m(unsigned long pfn)
                 if (p2m_pfn == PFN_DOWN(__pa(p2m_missing)))
                         p2m_init(p2m);
                 else
-                        p2m_init_identity(p2m, pfn);
+                        p2m_init_identity(p2m, pfn & ~(P2M_PER_PAGE - 1));
 
                 spin_lock_irqsave(&p2m_update_lock, flags);