diff --git a/xen/arch/x86/hvm/emulate.c b/xen/arch/x86/hvm/emulate.c
index 02698e93a1..23e436d7db 100644
--- a/xen/arch/x86/hvm/emulate.c
+++ b/xen/arch/x86/hvm/emulate.c
@@ -2308,6 +2308,10 @@ static int cf_check hvmemul_read_cr(
         val = curr->arch.hvm.guest_cr[reg];
         break;
 
+    case 8:
+        val = (vlapic_get_reg(vcpu_vlapic(curr), APIC_TASKPRI) & 0xf0) >> 4;
+        break;
+
     default:
         return X86EMUL_UNHANDLEABLE;
     }
@@ -2353,6 +2357,17 @@ static int cf_check hvmemul_write_cr(
         rc = hvm_set_cr4(val, true);
         break;
 
+    case 8:
+        if ( val & ~X86_CR8_VALID_MASK )
+        {
+            rc = X86EMUL_EXCEPTION;
+            break;
+        }
+
+        vlapic_set_reg(vcpu_vlapic(curr), APIC_TASKPRI, val << 4);
+        rc = X86EMUL_OKAY;
+        break;
+
     default:
         rc = X86EMUL_UNHANDLEABLE;
         break;
diff --git a/xen/arch/x86/include/asm/x86-defns.h b/xen/arch/x86/include/asm/x86-defns.h
index 2493ec277f..8afa9826a3 100644
--- a/xen/arch/x86/include/asm/x86-defns.h
+++ b/xen/arch/x86/include/asm/x86-defns.h
@@ -76,6 +76,8 @@
 #define X86_CR4_CET        0x00800000 /* Control-flow Enforcement Technology */
 #define X86_CR4_PKS        0x01000000 /* Protection Key Supervisor */
 
+#define X86_CR8_VALID_MASK 0xf
+
 /*
  * XSTATE component flags in XCR0 | MSR_XSS
  */