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KVM: selftests: Assert that XTILE_DATA is set in IA32_XFD on #NM 

Add an extra check to IA32_XFD to ensure that XTILE_DATA is actually set,
i.e. is consistent with the AMX architecture. In addition, repeat the
checks after the guest/host world switch to ensure the values of IA32_XFD
and IA32_XFD_ERR are well preserved.

Signed-off-by: Mingwei Zhang <mizhang@google.com>
Link: https://lore.kernel.org/r/20230221163655.920289-7-mizhang@google.com
[sean: massage changelog]
Signed-off-by: Sean Christopherson <seanjc@google.com>
pull/795/merge
Mingwei Zhang 2023-02-21 16:36:48 +00:00 committed by Sean Christopherson
parent 0aeb972948
commit 9cbd9aaa67
1 changed files with 2 additions and 0 deletions
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tools/testing/selftests/kvm/x86_64/amx_test.c
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@ -218,8 +218,10 @@ void guest_nm_handler(struct ex_regs *regs)
GUEST_SYNC(7);
GUEST_ASSERT(!(get_cr0() & X86_CR0_TS));
GUEST_ASSERT(rdmsr(MSR_IA32_XFD_ERR) == XFEATURE_MASK_XTILEDATA);
GUEST_ASSERT(rdmsr(MSR_IA32_XFD) == XFEATURE_MASK_XTILEDATA);
GUEST_SYNC(8);
GUEST_ASSERT(rdmsr(MSR_IA32_XFD_ERR) == XFEATURE_MASK_XTILEDATA);
GUEST_ASSERT(rdmsr(MSR_IA32_XFD) == XFEATURE_MASK_XTILEDATA);
/* Clear xfd_err */
wrmsr(MSR_IA32_XFD_ERR, 0);
/* xfd=0, enable amx */