chore(x86_64): add IA32_PAT_MSR to the exception list

IA32_PAT_MSR can be modified by the guest to change
page attributes for memory regions.

Signed-off-by: Egor Lazarchuk <[email protected]>

Author: ShadowCurse

tests/integration_tests/functional/test_cpu_template_helper.py

@@ -205,6 +205,8 @@ def build_cpu_config_dict(cpu_config_path):
     # features are temporarily disabled. Guest OS disables TILEDATA by default
     # using the MSR.
     0x1C4,
+    # IA32_PAT_MSR is R/W MSR for guest OS to control memory page attributes.
+    0x277,
     # MSR_IA32_TSC_DEADLINE specifies the time at which a timer interrupt
     # should occur and depends on the elapsed time.
     0x6E0,