Add check of CR0.TS[bit 3] before the check of IA32_XFD_ERR in the #NM
handler in amx_test. This is because XFD may not be the only reason of
the IA32_XFD MSR and the bitmap corresponding to the state components
required by the faulting instruction." (Intel SDM vol 1. Section 13.14)
Add the missing check of CR0.TS.
Signed-off-by: Mingwei Zhang <mizhang@xxxxxxxxxx>
---
tools/testing/selftests/kvm/x86_64/amx_test.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/tools/testing/selftests/kvm/x86_64/amx_test.c b/tools/testing/selftests/kvm/x86_64/amx_test.c
index aac727ff7cf8..847752998660 100644
--- a/tools/testing/selftests/kvm/x86_64/amx_test.c
+++ b/tools/testing/selftests/kvm/x86_64/amx_test.c
@@ -215,6 +215,7 @@ void guest_nm_handler(struct ex_regs *regs)
{
/* Check if #NM is triggered by XFEATURE_MASK_XTILEDATA */
GUEST_SYNC(7);
+ GUEST_ASSERT((get_cr0() & X86_CR0_TS) == 0);
GUEST_ASSERT(rdmsr(MSR_IA32_XFD_ERR) == XFEATURE_MASK_XTILEDATA);
GUEST_SYNC(8);
GUEST_ASSERT(rdmsr(MSR_IA32_XFD_ERR) == XFEATURE_MASK_XTILEDATA);
--
2.39.1.581.gbfd45094c4-goog
