[PATCH 2/2] nVMX: Verify KVM actually loads the value in HOST_PAT into the PAT MSR

[Sean Christopherson <seanjc@google.com>]

Check that the PAT MSR is actually loaded with vmcs.HOST_PAT on VM-Exit
in the testcase that shoves all legal PAT values into HOST_PAT.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 x86/vmx_tests.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/x86/vmx_tests.c b/x86/vmx_tests.c
index 8a17dd90..ef7e0ea9 100644
--- a/x86/vmx_tests.c
+++ b/x86/vmx_tests.c
@@ -7275,6 +7275,11 @@ static void test_pat(u32 field, const char * field_name, u32 ctrl_field,
 					error = 0;
 
 				test_vmx_vmlaunch(error);
+
+				if (!error)
+					report(rdmsr(MSR_IA32_CR_PAT) == val,
+					       "Expected PAT = 0x%lx, got 0x%lx",
+						val, rdmsr(MSR_IA32_CR_PAT));
 				wrmsr(MSR_IA32_CR_PAT, pat_msr_saved);
 
 				report_prefix_pop();
-- 
2.45.1.467.gbab1589fc0-goog