[PATCH 2/4] KVM: selftests: Extend AMX test to set XFD with active XTILE data

[Sean Christopherson]

Re-load tile data in the AMX test before setting XFD, e.g. to verify that
KVM doesn't try to state for a disabled component.

Explicitly release tile data before performing the #NM test to minimize
the chances of a false pass, and to verify that TILERELEASE can execute
even if XFD[18]=1.

Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
---
 tools/testing/selftests/kvm/x86/amx_test.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tools/testing/selftests/kvm/x86/amx_test.c b/tools/testing/selftests/kvm/x86/amx_test.c
index 3bcb10f26a70..ab6d8748d7b8 100644
--- a/tools/testing/selftests/kvm/x86/amx_test.c
+++ b/tools/testing/selftests/kvm/x86/amx_test.c
@@ -162,6 +162,11 @@ static void __attribute__((__flatten__)) guest_code(struct tile_config *amx_cfg,
 	GUEST_ASSERT(!(xstate->header.xstate_bv & XFEATURE_MASK_XTILE_DATA));
 	GUEST_ASSERT(xstate->header.xcomp_bv & XFEATURE_MASK_XTILE_DATA);
 
+	set_tilecfg(amx_cfg);
+	__ldtilecfg(amx_cfg);
+	__tileloadd(tiledata);
+	GUEST_SYNC(AMX_SYNC_SAVE_RESTORE | AMX_SYNC_CHECK_TILEDATA);
+
 	/* xfd=0x40000, disable amx tiledata */
 	wrmsr(MSR_IA32_XFD, XFEATURE_MASK_XTILE_DATA);
 
@@ -176,6 +181,7 @@ static void __attribute__((__flatten__)) guest_code(struct tile_config *amx_cfg,
 
 	GUEST_SYNC(AMX_SYNC_SAVE_RESTORE);
 	GUEST_ASSERT(rdmsr(MSR_IA32_XFD) == XFEATURE_MASK_XTILE_DATA);
+	__tilerelease();
 	set_tilecfg(amx_cfg);
 	__ldtilecfg(amx_cfg);
 	/* Trigger #NM exception */
-- 
2.52.0.351.gbe84eed79e-goog


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