From: Mingwei Zhang Date: Tue, 21 Feb 2023 16:36:47 +0000 (+0000) Subject: KVM: selftests: Add check of CR0.TS in the #NM handler in amx_test X-Git-Tag: v6.4-rc1~60^2~2^2~15 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=0aeb9729486a32fab168114b00006b2643aa8a41;p=thirdparty%2Fkernel%2Flinux.git KVM: selftests: Add check of CR0.TS in the #NM handler in amx_test Be extra paranoid and assert that CR0.TS is clear when verifying the #NM in the AMX test is due to the expected XFeature Disable error, i.e. that the #NM isn't due to CR0.TS=1. Signed-off-by: Mingwei Zhang Link: https://lore.kernel.org/r/20230221163655.920289-6-mizhang@google.com [sean: reword changelog to make it clear this is pure paranoia] Signed-off-by: Sean Christopherson --- diff --git a/tools/testing/selftests/kvm/x86_64/amx_test.c b/tools/testing/selftests/kvm/x86_64/amx_test.c index 34cf6f253c133..95a30611e03e5 100644 --- a/tools/testing/selftests/kvm/x86_64/amx_test.c +++ b/tools/testing/selftests/kvm/x86_64/amx_test.c @@ -216,6 +216,7 @@ 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)); GUEST_ASSERT(rdmsr(MSR_IA32_XFD_ERR) == XFEATURE_MASK_XTILEDATA); GUEST_SYNC(8); GUEST_ASSERT(rdmsr(MSR_IA32_XFD_ERR) == XFEATURE_MASK_XTILEDATA);