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Message-ID: <20230214184606.510551-8-mizhang@google.com>
Date: Tue, 14 Feb 2023 18:46:06 +0000
From: Mingwei Zhang <mizhang@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>,
Paolo Bonzini <pbonzini@...hat.com>
Cc: kvm@...r.kernel.org, linux-kselftest@...r.kernel.org,
linux-kernel@...r.kernel.org, Mingwei Zhang <mizhang@...gle.com>,
Jim Mattson <jmattson@...gle.com>,
Venkatesh Srinivas <venkateshs@...gle.com>,
Aaron Lewis <aaronlewis@...gle.com>,
"Chang S. Bae" <chang.seok.bae@...el.com>
Subject: [PATCH v2 7/7] KVM: selftests: x86: Repeat the checking of xheader
when IA32_XFD[XTILEDATA] is set in amx_test
Repeat the checking of AMX component in xheader after XSAVEC when
IA32_XFD[XTILEDATA] is set. This check calibrates the functionality scope
of IA32_XFD: it does not intercept the XSAVE state management. Regardless
of the values in IA32_XFD, AMX component state will still be managed by
XSAVE* and XRSTOR* as long as the corresponding bits are set XCR0.
Signed-off-by: Mingwei Zhang <mizhang@...gle.com>
---
tools/testing/selftests/kvm/x86_64/amx_test.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/tools/testing/selftests/kvm/x86_64/amx_test.c b/tools/testing/selftests/kvm/x86_64/amx_test.c
index 0e4c65f9e2f2..d991a473dc11 100644
--- a/tools/testing/selftests/kvm/x86_64/amx_test.c
+++ b/tools/testing/selftests/kvm/x86_64/amx_test.c
@@ -201,6 +201,16 @@ static void __attribute__((__flatten__)) guest_code(struct tile_config *amx_cfg,
/* xfd=0x40000, disable amx tiledata */
wrmsr(MSR_IA32_XFD, XFEATURE_MASK_XTILEDATA);
+
+ /*
+ * XTILEDATA is cleared in xstate_bv but set in xcomp_bv, this property
+ * remains the same even when amx tiledata is disabled by IA32_XFD.
+ */
+ xstate->header.xstate_bv = XFEATURE_MASK_XTILEDATA;
+ __xsavec(xstate, XFEATURE_MASK_XTILEDATA);
+ GUEST_ASSERT(!(xstate->header.xstate_bv & XFEATURE_MASK_XTILEDATA));
+ GUEST_ASSERT((xstate->header.xcomp_bv & XFEATURE_MASK_XTILEDATA));
+
GUEST_SYNC(6);
GUEST_ASSERT(rdmsr(MSR_IA32_XFD) == XFEATURE_MASK_XTILEDATA);
set_tilecfg(amx_cfg);
--
2.39.1.581.gbfd45094c4-goog
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